OWNER’S MANUAL
Safety, Assembly, Operating, and Maintenance Instructions
Model MDD (20.9 HP Diesel)
™
Please Read and Save These Instructions
For Safety, Read All Safety and Operation
Instructions Prior to Operating Machine
Effective Date: 02-15-05
P/N 7000-8
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Table of Contents
General Information ________________ 1
Operating Instructions_____________ 25
HIGHLIGHTED INFORMATION _____________ 1
GLOSSARY ____________________________ 1
IDENTIFYING NUMBER LOCATIONS________ 1
ENGINE SERIAL NUMBER LOCATION ______ 2
SERVICING OF ENGINE AND
CONTROL IDENTIFICATION,
LOCATION, AND FUNCTION _____________ 25
Operating Controls ___________________ 25
Engine Throttle ______________________ 25
Forward Speed Control (FSC) __________ 26
Steering Levers ______________________ 26
Blade Clutch (PTO) ___________________ 26
Parking Brake _______________________ 26
Front Body Latch Release _____________ 26
Transmission Lockout Levers __________ 27
Cold Start Lever
(Jackshaft Drive Belt Release) _________ 27
Instrument Panel _____________________ 29
Voltmeter ___________________________ 30
Water Temperature Gauge _____________ 30
Oil Pressure Warning Light ____________ 30
Water Temperature Warning Light_______ 30
Ignition Switch _______________________ 30
Light Switch (For Optional Lights)_______ 31
Hourmeter __________________________ 31
Circuit Breakers______________________ 31
Warning Horn________________________ 31
STARTING THE ENGINE_________________ 31
ADJUSTING GROUND
SPEED AND STEERING _________________ 33
ENGAGING THE MOWER________________ 34
STOPPING THE MACHINE _______________ 35
ADJUSTING CUTTING HEIGHT ___________ 35
TRANSMISSION LOCKOUT ______________ 36
RECOMMENDATIONS FOR MOWING ______ 37
RECOMMENDATIONS FOR TILT-UP DECK
OPERATION/TRANSPORT _______________ 38
GRASS HANDLING SYSTEM (GHS) _______ 39
General Information __________________ 40
Clogging Checklist ___________________ 41
Using the Tilt-Up Deck ________________ 42
Using the GHS Catcher________________ 42
Powerfil ® _________________________ 42
“Full” Signal Horn ___________________ 42
Cleaning the GHS Exhaust Screen ______ 42
Dumping the Catcher _________________ 43
Tailgate Dumping ___________________ 43
Using the Dump Bag _________________ 43
Power Dump Option _________________ 44
DRIVETRAIN COMPONENTS ______________ 2
Specifications________________________ 3
ENGINE________________________________ 3
ELECTRICAL SYSTEM ___________________ 3
TRANSMISSION_________________________ 3
BLADE DRIVE __________________________ 4
TIRE SIZE ______________________________ 4
TIRE PRESSURE ________________________ 4
DIMENSIONS (Tractor and Mower) _________ 5
MOWER DECK__________________________ 5
CURB WEIGHT (Approximate) _____________ 5
DRIVE BELTS___________________________ 6
GHS SYSTEM (Optional)__________________ 6
SEAT__________________________________ 6
FRAME/BODY CONSTRUCTION ___________ 6
Component Identification___________ 7
Safety Instructions _________________ 11
BEFORE OPERATING___________________ 11
OPERATING___________________________ 12
MAINTENANCE ________________________ 14
SAFETY, CONTROL, AND
INSTRUCTION DECALS _________________ 15
Assembly Instructions _____________ 17
SETUP INSTRUCTIONS _________________ 17
Tire Installation (Tractor)_______________ 17
Battery Service_______________________ 17
Wet Battery Service __________________ 17
Dry Battery Service __________________ 17
Battery Charging ____________________ 18
Battery Installation ___________________ 18
Mower Deck Assembly ________________ 18
Deck Caster Wheels Installation ________ 18
Deck Discharge Chute Installation ______ 19
Deck Discharge Shield Installation ______ 19
PTO Shaft Guard Installation __________ 19
Tilt-Up Roller Wheel Installation ________ 19
Mower Deck Installation on Tractor ______ 20
Deck Installation ____________________ 20
Deck Leveling ______________________ 22
PREOPERATING CHECKLIST ____________ 23
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Table of Contents
REPLACING/REPAIRING ________________ 64
Drive Belts __________________________ 64
Engine PTO Drive Belt _______________ 65
Jackshaft Drive Belt _________________ 66
GHS Blower Drive Belt _______________ 67
Hydrostatic Ground Drive Belt _________ 68
Engine Fan Belt ____________________ 69
Fuel Filter ___________________________ 70
Blade Overload Shear Bolts ____________ 70
PTO Shear Pin _______________________ 71
Mower Blades _______________________ 71
ADJUSTMENTS________________________ 72
Steering Levers ______________________ 72
Tilt-Up Deck Adjustable Stop ___________ 72
GHS Signal Horn Adjustment
Maintenance Instructions__________ 46
MAINTENANCE SCHEDULE CHART _______ 46
IMPORTANT TIPS FOR CARE
OF THE KUBOTA ENGINE _______________ 47
Fuel System _________________________ 47
Starting/Stopping_____________________ 47
Cooling System ______________________ 47
Air Cleaner System ___________________ 47
Oil _________________________________ 47
LUBRICATION _________________________ 48
Engine Oil ___________________________ 48
Engine Break-In Oil __________________ 48
Checking Engine Crankcase Oil Level ___ 48
Changing Engine Crankcase Oil/Oil Filter _ 48
Grease Fitting and Oil Point Lubrication __ 49
Mower Deck Gearbox Lubrication _______ 52
DSD52 or DSD62
Mower Deck Lubrication _______________ 52
Tractor PTO Gearbox Lubrication _______ 53
Checking Gearbox Oil Level ___________ 53
Changing Gearbox Oil ________________ 53
Gear Axle Lubrication _________________ 53
Hydrostatic Transmission Fluid _________ 54
Checking Hydrostatic
(When Horn Sounds at Wrong Time)_____ 72
Maintenance And Service
Record Sheet_______________________ 74
Warranty___________________________ 75
Transmission Fluid Level ______________ 54
CLEANING ____________________________ 55
Engine Air Cleaner System _____________ 55
Turbine Precleaner __________________ 55
Donaldson Radialseal™ Air Cleaner _____ 56
Engine Cooling System________________ 57
Radiator Screen and Cooling Fins ______ 57
Flushing Radiator and Changing Coolant _ 58
Grass Buildup in Mower Housing________ 58
GHS Blower _________________________ 59
GHS Exhaust Screen __________________ 59
Hydrostatic Transmission Cooling Fins __ 59
CHECKING/SERVICING _________________ 60
Engine Cooling System________________ 60
Coolant Level ______________________ 60
Fan Belt Tension ____________________ 60
Security of Air Filtration Components ____ 61
Battery______________________________ 61
Electrolyte Level ____________________ 61
Cleaning the Terminals _______________ 61
Charging the Battery _________________ 61
Tire Pressure ________________________ 61
Sharpen Mower Blades ________________ 62
Drive Belts __________________________ 63
Mower Deck Gearbox Oil Seals _________ 63
Fuel Lines and Clamps ________________ 63
Radiator Hoses and Clamps ____________ 63
Blade Brake Action ___________________ 63
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General Information
HIGHLIGHTED INFORMATION
•
•
POWER TAKE-OFF (PTO) transmits engine
power to run the cutter blades and GHS blower.
Walker Manufacturing recommends that any ser-
vice requiring special training or tools be performed
by an authorized Walker Mower Dealer. There are
several general practices to be aware of in the area
of safety. Most accidents associated with the oper-
ation or maintenance of a Walker Mower are
caused by disregarding basic safety precautions or
specific warnings. Such accidents, in most cases,
can be prevented by being aware of the dangers
present.
POWERFIL spreads the mowed material
throughout the interior of the grass catcher by
an oscillating delivery spout.
•
RIGHT HAND (RH) refers to the right-hand side
of the tractor when the operator is seated facing
forward in the tractor seat.
•
•
•
SIDE DISCHARGE (SD) mows but does not
collect the mowed material.
Information of special importance has been high-
lighted in bold type in this manual. Refer to Safety
Instructions for the meanings of DANGER, WARN-
ING, CAUTION, IMPORTANT, and NOTE.
STEERING LEVERS steer the tractor by con-
trolling the dual hydrostatic transmissions.
TRACTOR is the prime mover, including the en-
gine, drive train, operator seat, and controls to
operate the mower.
GLOSSARY
There are many terms that are either unique to this
equipment or that are used as acronyms. The fol-
lowing terms and their definitions will help while
using this manual:
•
TRANSMISSION LOCKOUT releases the hy-
drostatic transmissions to permit freewheeling
the tractor.
IDENTIFYING NUMBER LOCATIONS
•
DECK is the mowing attachment mounted on
the front of the tractor which includes the carrier
frame, deck housing, blade drive gearboxes,
and cutter blades.
The tractor serial number plate is affixed to the trac-
tor body just below the left rear corner of the seat.
The mower deck serial number plate is affixed
alongside the angle iron framing on the LH side of
the LH mower blade drive. Model and serial num-
bers are helpful when obtaining replacement parts
and maintenance assistance. For ready reference,
please record these numbers in the space provided.
•
FORWARD SPEED CONTROL (FSC) controls
the maximum forward speed of the tractor;
functioning as a cruise control.
•
•
GRASS HANDLING SYSTEM (GHS ) collects
mowed material and deposits it in the catcher.
Tractor Model No. _______________________
Tractor Serial No. _______________________
GRASS-PAK SWITCH is mounted on the
grass delivery spout (in the catcher) and acti-
vates the “full” signal horn when the grass
catcher is full.
Deck Serial No.
_______________________
•
•
GROUND DRIVE refers to the dual hydrostatic
transmissions which drive the main wheels.
Engine Model No. _______________________
Engine Serial No. _______________________
Date of Purchase _______________________
HYDROSTATIC TRANSMISSION transmits
and controls power from the ground drive belt to
the main drive wheel.
•
LEFT HAND (LH) refers to the left-hand side of
the tractor when the operator is seated facing
forward in the tractor seat.
Fill In By Purchaser
1
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General Information
SERVICING OF ENGINE AND DRIVETRAIN
COMPONENTS
Serial Number
The detailed servicing and repair of the engine,
hydrostatic transmission, and gearboxes are not
covered in this manual. Only routine maintenance
and general service instructions are provided. For
the service of these components during the limited
warranty period, it is important to find a local,
authorized servicing agent of the component manu-
facturer. Any unauthorized work done on these
components during the warranty period may void
the warranty. If you have any difficulty finding an
authorized outlet or obtaining warranty service,
please contact our Service Department for assis-
tance:
Tractor Serial Number Location
Walker Manufacturing Company
5925 E. Harmony Road
Fort Collins, CO 80528
1-970-221-5614
Serial Number
Service manuals are available for each of these
components from their respective manufacturers as
follows:
Kubota Engines
Kubota Tractor Corp.
1300 Remington Road
Schaumburg, IL 60173
Mower Deck Serial Number Location
ENGINE SERIAL NUMBER LOCATION
Hydrostatic
Transmissions
Eaton Corporation
15151 Highway 5
Eden Prairie, MN 55344
Refer to the engine manual that accompanies this
manual for the location of the engine serial number.
For the mower model covered by this manual, an en-
gine manual is available covering the Kubota D722
diesel engine (liquid cooled).
Gearboxes (Deck)
Tecumseh Products Co.
900 North Street
Grafton, Wl 53024
Serial Number
Engine Serial Number Location
2
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Specifications
MDD
MODEL
ENGINE
Manufacturer/Model
Displacement
Kubota D722, 3 Cyl., Diesel (Liquid Cooled)
44.0 cu. in. (722 cc)
HP (@ 3600 RPM)
Max. RPM (No Load)
Governed RPM
20.9
3800
3600
Max. Torque [ft-lb (N·m) @ RPM]
Idle RPM
34 (46.1) @ 2600
1000 ± 50
N/A
Spark Plug Type
Spark Plug Gap
N/A
Crankcase Capacity
Crankcase Lubricant
3.1 qts (2.9 liters)
API CC/CD/CE Grade Oil Only with 10W-30 Viscosity or 30W
above 77° F (25° C) Only
Fuel Tank Capacity
Fuel
5 Gallons (19 liters)
Diesel Fuel 2-D
Cooling System Capacity
(Approx.)
1.25 Gallon (4.74 liters)
Cooling Fan
Coolant
Electric radiator cooling fan with reversible self-cleaning action
50/50 Pre-Mix Antifreeze/Water
ELECTRICAL SYSTEM
Battery
12 Volt, 41AH, 340 CCA
(Interstate U1-SP40)
Charging System
Charging Output
System Polarity
Ignition
Automotive Type Alternator
12.5 Amp DC (Regulated)
Negative Ground
Diesel with Glow Plugs
Starter
12 Volt Electric Ring-Gear Type, Solenoid Shift
Interlock Switch
Ignition Lockout by Seat Switch, Transmission Neutral and Blade
Clutch
Circuit Breaker
Manual Reset (40A)
TRANSMISSION
Manufacturer/Model
Dual Hydrostatic, Eaton Model 7, Each Wheel Independently
Driven
Steering
Hand Lever Control / Individual Wheel
Forward Speed Control
Precision Friction Lock Lever, Cruise Control, with Neutral-Park
Position
3
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Specifications
MDD
MODEL
TRANSMISSION (continued)
Service Brake
Parking Brake
Neutral
Dynamic Braking through Hydrostatic Transmission
Mechanical Pin Lock in Transmission Gear
Transmission Release by Manual Dump Valve
Gear Drive Axle
Final Drive
Transmission Fluid
Factory Service
Mobil 1 Synthetic Motor Oil (15W50)
SAE 30W Straight Viscosity Motor Oil
1 qt (1 liter)
Alternate Transmission Fluid
Transmission Fluid Capacity
Transmission Cooling
Cooling Fan Mounted on Drive Pulley
Ground Travel Speed
Forward m.p.h. (km/h)
Reverse m.p.h. (km/h)
0-5 (0-8) Infinitely Variable
0-5 (0-8) Infinitely Variable
BLADE DRIVE
PTO Shaft
Quick Disconnect Spline Shaft with Two High-Speed
U-Joints
Blade Spindle
Each Blade (2) Mounts Direct on Peerless Right Angle Gearbox
with Tee Gearbox in Center Connected to PTO Shaft (Complete
Geared Drive, Peerless Model 1000 Gearboxes)
Blade Drive Clutch and Brake
Manual Belt Tightener Clutch and Band Brake (Stops Blades
within Five (5) Seconds of Disengagement)
Max. Blade Speed
2900 RPM [16700 FPM (5090 m/min)]
[25 in. (64 cm) Blade]
@ 3600 RPM Engine
TIRE SIZE
Deck Caster Wheel
Deck Caster Wheel (Optional)
Drive
2.80/2.50-4 Pneumatic (4-Ply)
8.25 x 2.75 Semi-Pneumatic
18 x 9.50-8 (4-Ply)
Rear (Dual)
13 x 5.00-6 (4-Ply)
TIRE PRESSURE
Deck Caster Wheel
20 PSI (137 kPa)
15 PSI (103 kPa)
20 PSI (137 kPa)
Drive
Rear
4
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Specifications
MDD
MODEL
DIMENSIONS (Tractor and Mower)*
Length
91 in. (231 cm)
49 in. (124 cm)
44 in. (112 cm)
42-1/4 in. (107 cm)
29-3/4 in. (76 cm)
Width
Height
Wheel Base (Tractor)
Tread Width (Tractor)
MOWER DECK
Width of Cut SD/GHS
Cutting Height
42 or 48 in. (107 or 122 cm)
1 to 4 in. (3 to 10 cm)
Height Adjustment
7 Positions - 1/2 in. (1 cm) Increment Hitch Pins Installed in
Multi-Position Deck Support
Blade Size (Typical)
42 in. (107 cm) SD
22 in. (56 cm)
2 in. (5 cm) Center Overlap
(Two Blades, CW Rotation)
48 in. (122 cm) GHS
Deck Suspension
25 in. (64 cm)
2 in. (5 cm) Center Overlap
(Two Blades, Counter Rotate)
Torsion-Flex Frame with Caster Wheels and Counterweight
Springs
CURB WEIGHT (Approximate)
SD Tractor Only
760 lb (345 kg)
850 lb (386 kg)
1020 lb (463 kg)
GHS Tractor Only
Tractor and Mower*
*Dimensions and weight shown are for 48 in. (122 cm) GHS Model (typical).
Dimensions for Tractor and Mower with 42 in. (107 cm) deck are:
Length = 88 in. (224 cm)
Width = 43 in. (110 cm)
For SD Models, subtract 7 in. (18 cm) from the height.
Deck weight for 48 in. (122 cm) Tilt-Up deck = 205 lb (93 kg). Deck sizes range from 42 to 72 in.
(107 to 183 cm), with corresponding deck weights ranging from 170 to 400 lb (77 to 181 kg).
Optional (9.5 Bushel) Grass Catcher adds approx. 5 lb (2 kg) and 5 in. (13 cm) in Height
5
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Specifications
MDD
MODEL
DRIVE BELTS
Engine PTO
Walker P/N 7230
Jackshaft Drive
Ground Drive
Blower (GHS Model)
Gates 3VX355 (P/N 6231)
Walker P/N 7248
Gates 3VX280 (P/N 7234-1)
GHS SYSTEM (Optional)
Blower
4 x 10 x 1/4 in. (10 x 25 x 1 cm) Three-Blade Paddle Wheel (Driven
by Mower Engine)
Blower Brake
Band Brake (Works in Combination with PTO Clutch, Stops Blower
within Five (5) Seconds of PTO Disengagement)
Max. Blower Speed
3600 RPM
Grass Catcher Capacity
Optional Grass Catcher Capacity
Full Signal
65 Gallons (246 liters)/7.0 Bushels
89 Gallons (335 liters)/9.5 Bushels
Oscillating Vane Switch Mounted on Grass Delivery Spout
Triggers Horn Signal
Powerfil ®
Oscillating Delivery Spout Driven by 12 Volt Electric Gearmotor
Spreads Material throughout Interior of Catcher @ 25 Cycles/
Minute
SEAT
Contour-Molded, with Nylon Backed Vinyl Cover and Integral
Foam Cushion
FRAME/BODY CONSTRUCTION
Frame
All Welded Unitized Steel Chassis
14 Gauge Steel
Body
Deck
11 Gauge Steel
GHS Catcher and Chutes
Molded Cross-Linked Polyethylene (UV Stabilized)
NOTE: The manufacturer reserves the right to make changes in specifications shown herein at any time
without notice or obligation.
6
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Component Identification
NOTE: Control Identification
shown in Operating
Instructions section.
Catcher Door
Safety Latch
Turbine
Precleaner
Grass Handling System
9.5 Bushel Catcher
Tilt-Up
Latch
Spring Clip
Counterweight Spring
and Protective Cover
Transmission Control Rod
Adjustment Nut (LH)
Deck Support Pins
and Height Adjustment
Hitch Pins
Anti-Scuff
Roller
Catcher Lift /
Dump Handle
Tilt-Up
Deck Handle
Fuel Tank and Cap
Transmission Control Rod
Adjustment Nut (RH)
Deck Support Arms
Footrests
Deck Lift Handle
(Cutting Height Adjustment)
Tilt-Up Hook
Deck Caster Wheels
Front View and Right Side View
7
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Component Identification
Catcher Door Gas
Spring Protective Cover
Removable Grass
Catcher Screen
(Not Visible)
Catcher Door
Gas Spring
Catcher Exhaust
Deflector
Radiator Cap
Radiator
Catcher Lift /
Dump Handle
Instrument Panel
Guard
Catcher
Door
Instrument Panel Box
(Shock Mounted)
Catcher
Door Handle
Dump Plate
Fuel
Filter
Anti-Scuff
Roller
Muffler and
Tailpipe
Radiator
Guard
Left Hand
Drive Wheel
Coolant
Recovery Tank
Radiator
Screen
Tailwheel Fork
and Wheel
Rear View and Left Side View
8
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Component Identification
Muffler
Donaldson
Air Cleaner
Air Cleaner
Cover
Tailpipe
Overflow Hose
Radiator Cap
Air Restriction Indicator
Radiator
Precleaner Tube
Jackshaft
Radiator
Guard
PTO Gearbox
Dipstick
GHS Blower
Turbine
Precleaner
RH Hydrostatic
Transmission
RH Transmission
Lockout Lever
40 Amp
Circuit Breaker
Neutral Safety
Switch
PTO
Clutch Lever
LH Transmission
Lockout Lever
30 Amp
Circuit Breaker
Positive (+)
Battery Cable
LH Hydrostatic
Transmission
Battery
Negative (-)
Battery Cable
Top View (Engine Compartment)
9
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Component Identification
Water Temperature
Gauge Sender
Exhaust
Manifold
Starter Motor Below
(Not Visible)
Oil Fill
Cap
Alternator
Thermostat Housing
and Thermostat
Glow Plug(s)
Water Pump
Fan Motor
Fuel Pickup
Line
Fuel Return
Line
Radiator Screen
(Removable)
Fuel Tank
Cap
Radiator Fan
and Shield
Throttle Control
Linkage Lever
Engine Stop Lever Linkage
(Fuel Shut-Off Valve)
Injection
Pump
Air Intake
Injectors
Hose
Top View (Engine Compartment)
10
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Safety Instructions
Pay particular attention to any information labeled
DANGER, WARNING, CAUTION, IMPORTANT,
and NOTE in this manual.
Walker Manufacturing cannot predict every poten-
tially dangerous situation. Therefore, items labeled
as such in this manual do not cover all conceivable
situations. Any person using procedures, tools, or
control techniques not recommended by Walker
Manufacturing must take full responsibility for safety.
When you see the Safety Alert Symbol (
),
read, understand, and follow the instructions. Fail-
ure to comply with safety instructions may result in
personal injury.
The Walker Rider Lawnmower has been designed
with many safety features to protect the operator
from personal harm or injury. However, it is neces-
sary for the operator to use safe operating proce-
dures at all times. Failure to follow safety
instructions contained in this manual may re-
sult in personal injury or damage to equipment
or property.
The seriousness or degree of importance of each
type of information is defined as follows:
DANGER
An IMMEDIATE hazard that WILL result in
severe personal injury or DEATH, if warn-
ing is ignored and proper safety precau-
tions are not taken.
If you have any questions concerning setup, opera-
tion, maintenance, or safety, please contact your
authorized Walker Mower Dealer or call Walker
Manufacturing Company at (970) 221-5614.
BEFORE OPERATING
WARNING
1. Read and understand the contents of this
Owner’s Manual before starting and operat-
ing the machine. Become thoroughly familiar
with all machine controls and how to stop the
machine and disengage the controls quickly.
Replacement Owner’s Manuals are available
by sending the Model and Serial Number to:
A POTENTIAL hazard that COULD result in
severe personal injury or DEATH, if warn-
ing is ignored and proper safety precau-
tions are not taken.
Walker Manufacturing Company
5925 East Harmony Road
Fort Collins, CO 80528
CAUTION
Possible hazards or unsafe practices that
MAY result in MODERATE personal injury
or property damage, or machine damage, if
warning is ignored and proper safety pre-
cautions are not taken.
2. Never allow children to operate rider mower.
Do not allow adults to operate without proper
instruction.
3. Clear the area to be mowed of any foreign
objects which may be picked up and thrown by
cutter blades. Pick up all sticks, stones, wire,
and any other debris.
IMPORTANT: Identifies mechanical information
demanding special attention, since it deals with the
possibility of damaging a part or parts of the ma-
chine.
4. Keep everyone, especially children and pets, a
safe distance away from the area being mowed.
Do not mow with bystanders in the area.
5. Do not operate the machine barefoot or wearing
sandals, sneakers, tennis shoes, or similar light-
weight footwear. Wear substantial protective
footwear.
NOTE: Identifies information worthy of special at-
tention.
11
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Safety Instructions
6. Do not wear loose fitting clothing that could get
caught in moving parts. Do not operate this
machine while wearing shorts; always wear
adequate protective clothing, including long
pants. Wearing safety glasses, safety shoes,
and a helmet is advisable and required by some
local ordinances and insurance regulations.
12. The electrical system battery contains sulfuric
acid. Avoid any contact with skin, eyes, and
clothing. Keep the battery and acid out of reach
of children.
OPERATING
1. Operate the mower only in daylight or in
good artificial light with good visibility of the area
being mowed.
7. Prolonged exposure to loud noise can cause im-
pairment or loss of hearing. Operator hearing
protection is recommended; particularly for
continuous operation of the GHS Model due to
blower noise level. Wear a suitable hearing pro-
tective device, such as earmuffs or earplugs.
2. Sit on the seat when starting the engine and
operating the machine. Keep feet on the deck
footrests at all times when the tractor is moving
and/or mower blades are operating.
8. Keep all protective shields and safety de-
vices in place. If a protective shield, safety
device, or decal is damaged, unusable, or miss-
ing, repair or replace it before operating the ma-
chine.
3. For a beginning operator, learn to steer (ma-
neuver) the tractor with a slow engine speed
before attempting any mowing operation.
Be aware that, with the front mounted mower
configuration, the back of the tractor swings to
the outside during turns.
9. Be sure interlock switches are functioning
correctly, so the engine cannot be started un-
less the Forward Speed Control lever is in the
NEUTRAL-PARK position, and the PTO clutch
is in the DISENGAGED position. Also, the en-
gine should stop if the operator lifts off the seat
with the PTO clutch in the ENGAGED position.
4. Remember, for an emergency stop, the forward
motion of the tractor can always be stopped by
pulling the Forward Speed Control (FSC) into
the NEUTRAL-PARK position.
5. In case either of the transmission drive belts
break during operation, and if the machine is on
a slope, the machine will freewheel down the
slope. To maintain control, immediately (1)
Release the steering levers and simultaneously
(2) Move the FSC to the NEUTRAL-PARK posi-
tion. When the machine is stopped or moving
slowly, engage the parking brake.
10. Handle diesel fuel with care:
a. Use an approved fuel container.
b. Never add fuel to a running engine or hot
engine (allow hot engine to cool several
minutes).
NOTE: This is exactly the same procedure used
to normally stop and park the machine.
c. Keep matches, cigarettes, cigars, pipes,
open flames, or sparks away from the fuel
tank and fuel container.
6. Disengage the blade clutch and put the FSC in
the NEUTRAL-PARK position before starting
the engine (an ignition interlock switch normally
prevents starting of the machine if these con-
trols are in the OPERATING position).
d. Always fill the fuel tank outdoors using care.
Filltoaboutoneinchfromthetopofthetank.
Use a funnel or spout to prevent spilling.
e. Replace the machine fuelcapandcontainer
cap securely and clean up any spilled fuel
before starting the engine.
7. Do not run the engine in a confined area
without adequate ventilation. Exhaust fumes
are hazardous and can be deadly.
11. Never attempt to make any adjustments
while the engine is running, except where
specifically instructed to do so.
8. Do not carry passengers - maximum seating
capacity is one (1) person.
12
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Safety Instructions
9. Watch for holes, rocks, and roots in the terrain
and for other hidden hazards. When mowing
tall grass, mow higher than desired to expose
any hidden obstacles. Then, clean the area
and mow to the desired height.
17. For GHS equipped models, use care when
closing the grass catcher door. Keep fingers
and hands away from the hinge and pinch
points when the door is being closed. Also,
keep fingers and hands clear of the door frame.
The door is held closed with springs and the
door may slam shut with considerable force.
10. Avoid sudden starts or stops. Before backing
the machine up, look to the rear to be sure no
one is behind the machine. Watch carefully for
traffic when crossing or working near roadways.
18. In case of a clogged or plugged mower deck
or GHS catching system:
11. Disengage the blade drive when transporting
the machine across drives, sidewalks, etc. Ne-
ver raise the mower deck while blades are
rotating.
a. Disengage the blade clutch (PTO) and turn
the engine off before leaving the seat.
b. LOOK to make sure blade drive shaft and
blower drive pulley movement has stopped
before trying to unclog the system.
12. The maximum recommended side slope op-
erating angle is 20 degrees or 33% grade.
When operating the machine on a slope, reduce
speed and use caution to start, stop, and ma-
neuver. To prevent tipping or loss of control of
the machine, avoid sharp turns or sudden
changes in direction.
c. Disconnect the electrical plug on the fuel
shut-off solenoid.
d. Never place hands under the deck or in the
GHS blower - use a stick or similar tool to
remove clogged material.
13. Never adjust cutting height with the engine
running. Before adjusting cutting height or
servicing, disengage the blade clutch (PTO),
stop the engine, and remove the ignition key.
Wait for all movement to stop before getting off
the seat.
19. If the cutting blades strike a solid object or the
machine begins to vibrate abnormally, immedi-
ately disengage the blade clutch (PTO), stop
the engine, and wait for all moving parts to
stop. To prevent accidental starting, discon-
nect the electrical plug on the fuel shut-off sole-
noid. Thoroughly inspect the mower and repair
any damage before restarting the engine and
operating the mower. Make sure cutter blades
are in good condition and blade nuts are
torqued to 60 ft-lb (81.3 N·m).
NOTE: A blade/blower brake should normally
stop drive line rotation within five (5) seconds of
disengaging the PTO clutch.
14. For side discharge mower decks, do not oper-
ate with the grass deflector chute removed.
Keep the deflector in the lowest possible posi-
tion.
20. Do not touch the engine or muffler while the
engine is running or immediately after stop-
ping the engine. These areas may be hot
enough to cause serious burns.
15. For tractors equipped with tilt-up deck, observe
the following recommendations:
21. Never remove the radiator pressure cap
when the engine is hot (hot water may spray
and cause burns).
a. Do not move tractor with deck in tilt-up po-
sition.
b. Never tilt body forward with deck in tilt-up
position.
22. Do not use ether or any starting fluid to assist
starting the engine in cold weather.
16. For GHS equipped models, do not operate the
machine with the grass catcher in the DUMP
position or with the back door OPEN. Dan-
gerous projectiles may be thrown out of the dis-
charge chute or the back of the grass catcher.
23. When leaving the machine unattended, dis-
engage the blade clutch (PTO), stop the en-
gine, and remove the key.
13
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Safety Instructions
MAINTENANCE
11. Use genuine factory replacement parts.
Substitute parts may result in product malfunc-
tion and possible injury to the operator and/or
others.
1. To prevent accidental starting of the engine
when servicing or adjusting the machine, re-
move the key from the ignition switch and dis-
connect the electrical plug on the fuel shut-off
solenoid.
12. Use care when charging the battery or per-
forming maintenance on the battery and electri-
cal system:
2. To reduce fire hazards, keep the engine free of
grass, leaves, excessive grease, and dirt.
a. Make sure the battery charger is unplugged
before connecting or disconnecting cables
to the battery.
3. Keep all nuts, bolts, and screws tight to ensure
the machine is in a safe, working condition.
Check the blade mounting nuts frequently, mak-
ing sure they are tight.
b. Charge the battery in a well-ventilated
space, so gases produced while charging
can dissipate. Make sure the battery vents
in the caps are open.
4. Perform only maintenance instructions de-
scribed in this manual. Unauthorized main-
tenance operations or machine modifications
may result in unsafe operating conditions.
c. Keep sparks, flames, and smoking materi-
als away from the battery at all times. To
avoid sparks, use care when removing bat-
tery cables from posts.
5. If the engine must be running to perform a main-
tenance adjustment, keep hands, feet, and
clothing away from moving parts. Do not wear
jewelry or loose clothing.
d. Disconnect both battery cables before
unplugging any wiring connectors or mak-
ing repairs on the electrical system.
6. Always use the proper engine service man-
ual when working on the engine. Unautho-
rized maintenance operations or modifications
to the engine may result in unsafe operating
conditions.
IMPORTANT: Keep all applicable manuals
immediately accessible to anyone who may
operate or service this machine.
7. The fuel oil injection system operates under
high pressure and can penetrate the skin and
result in serious injury. Unqualified persons
should not remove or attempt to adjust a pump
injector, nozzle, or any part of the fuel injection
system.
8. Altering the equipment or engine in any manner
which adversely affects its operation, perfor-
mance, durability, or use will VOID the warran-
ty and may cause hazardous conditions.
9. Never attempt to disconnect any safety devices
or defeat the purpose of these safety devices.
10. Do not change the engine governor settings or
overspeed the engine. The governor has been
factory-set for maximum-safe engine operating
speed.
14
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Safety Instructions
SAFETY, CONTROL, AND INSTRUCTION DECALS
Safety, Control, and Instruction Decals are installed on the machine;
if any are missing, illegible, or damaged, a replacement should be ordered and installed before
putting the machine into operation. The Decal Part Number is listed below and in the Parts Manual.
Adjacent to Blower Discharge Chute
Each End of Mower Deck (5808)
through Body (5804)
Hydrostat Oil
Reservoir (5810-2)
SD Deck Discharge Shield (5848)
Front Body Adjacent to
RH Steering Lever (7818)
Radiator Screen Frame Near Radiator Fill Cap (7826)
On Body Adjacent to Clutch
Control Lever (5806)
Rear of Grass Catcher Exhaust Screen (5869)
Rear Cross Member of Front Body (8825)
Right Side of Front Body, Below
Front Body Latch Release (7820)
15
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Safety Instructions
SAFETY, CONTROL, AND INSTRUCTION DECALS
Safety, Control, and Instruction Decals are installed on the machine;
if any are missing, illegible, or damaged, a replacement should be ordered and installed before
putting the machine into operation. The Decal Part Number is listed below and in the Parts Manual.
Jackshaft Support Adjacent
to Dipstick (7827)
Deck Gearbox Cover (5807-3)
Deck Carrier Frame (8647)
Gear Axle (5810-1)
Deck Carrier Frame (8653)
Deck Carrier Frame (5865)
Catcher Safety Latch,
RH Side (5874)
Right Side, Below Operator Seat (7809)
Top of Blower Housing (5819)
Catcher Door Hinge Bar,
LH and RH Sides (5868)
Left Side of Operator Seat (7819)
Instrument Panel (7823-4)
Fender, RH Side (7802)
16
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Assembly Instructions
SETUP INSTRUCTIONS
Dry Battery Service
Walker Mowers are shipped partially assembled.
After uncrating the tractor and mower deck, initial
setup is required.
DANGER
Activating a battery can be dangerous.
The battery should be taken to a reliable
service station, battery store, or power
equipment dealer where a trained techni-
cian can activate the battery safely. DO
NOT attempt to activate the battery unless
you are experienced in battery service
work. The following activation and charg-
ing instructions are provided for use by a
trained battery technician.
NOTE: During the process of unpacking, any dam-
aged or missing parts should be noted and reported
to the delivering carrier immediately (put in writing
within 15 days). The carrier will provide directions
for proceeding with a claim to receive compensation
for damage.
Tire Installation (Tractor)
• Install the drive tires using the eight (8) lug bolts
that are supplied with the owner’s packet of mater-
ials. Drive tires are 18 x 9.50-8, 4-ply; rear tires are
13 x 5.00-6, 4-ply.
DANGER
• Check and adjust the inflation of the tires. The
tire inflation recommendations are:
Battery electrolyte is a poisonous and cor-
rosive sulfuric acid solution.
Drive = 15 PSI (103 kPa)
Rear = 20 PSI (137 kPa)
• Avoid spillage and contact with skin,
eyes, and clothing - causes severe burns.
Battery Service
• To prevent accidents, wear safety gog-
gles and rubber gloves when working with
electrolyte.
Raise front mower body up for battery access (refer
to Front Body Latch Release in Operating Instruc-
tions). Check the battery for electrolyte level and
charge. The electrolyte level should be at the bot-
tom of the vent wells [1/4 to 1/2 in. (6 to 13 mm)
above plates]. If the specific gravity is less than
1.225, the battery needs charging. If the battery has
been shipped dry, or is wet but needs service, refer
to the following instructions.
• Neutralize acid spills with baking soda
and water solution.
To fill (activate) battery with electrolyte (if battery has
been shipped dry):
1. Remove the battery hold down bar, disconnect
the battery cables and lift the battery out of the
tray.
IMPORTANT: Make sure battery is securely
mounted in the frame. A loose battery may cause
damage to the case resulting in acid leakage and se-
vere damage to the machine. A hazard may be cre-
ated by damage to critical working parts and safety
systems.
IMPORTANT: Battery must be removed from
the mower before filling with electrolyte.
IMPORTANT: Obtain and use only battery
grade sulfuric acid electrolyte with a 1.265 spe-
cific gravity to activate the battery. DO NOT use
water or any other liquid during initial activation.
Wet Battery Service
Ifthebatteryhasbeenshippedwet,buttheelectrolyte
level is low or the battery needs to be charged then:
2. Remove the filler caps and carefully fill each cell
until the electrolyte is just above the plates.
1. Fill each battery cell with drinking water to the
bottom of the vent wells.
3. After the battery is filled with electrolyte, replace
the filler caps and charge the battery. Refer to
Battery Charging.
2. Charge battery. Refer to Battery Charging in
this section.
17
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Assembly Instructions
Battery Charging
WARNING
DANGER
Make sure the battery cap vents are open.
Improper venting of the battery COULD
cause a battery explosion.
BATTERIES PRODUCE EXPLOSIVE GASES
• Charge the battery in a well-ventilated
area, so that gases produced while charg-
ing can dissipate.
• Keep sparks, flames, and smoking mate-
rials away from the battery at all times.
• Make sure the battery cap vents are open
after the battery is filled with acid (check
manifold vent on each cap).
• Make sure the battery charger is unplug-
ged before connecting or disconnecting
cables to the battery.
Battery Clamp Secured
by Wing Nut(s)
(+) Battery Cable
Connection
Battery Installation
Mower Deck Assembly
1. Charge the battery at 15 amps for 10 minutes.
DO NOT exceed 20 amps maximum recom-
mended charging rate. Charge until specific
gravity is at least 1.250. Total charging time
should not exceed one (1) hour.
Deck Caster Wheels Installation
1. Remove the bolt, nut, axle spacer tube, and
spacer washers from each deck caster wheel
fork.
2. After charging the battery, adjust the electrolyte
level to the bottom of the vent wells [1/4 to 1/2 in.
(6 to 13 mm) above the plates].
NOTE: Spacer washers are used only when
the optional semi-pneumatic deck wheels (8.25
x 2.75) are installed.
IMPORTANT: DO NOT overfill the battery.
Electrolyte will overflow through the vented caps
onto parts of the machine and WILL result in
severe corrosion.
2. Fit the axle spacer tube through the wheel hub,
position the spacer washer on each side of the
hub (if used), and fit the assembly into the wheel
fork.
3. Install battery.
Battery Installation
3. Insert the 3/8-16 x 4-1/2 in. bolt through the
wheel fork with the bolt head to the outside and
install the 3/8-16 in. Keps nut.
IMPORTANT: Make sure battery is securely
mounted in the frame. A loose battery may cause
damage to the case resulting in acid leakage and se-
vere damage to the machine. A hazard may be cre-
ated by damage to critical working parts and safety
systems.
4. Tighten the bolt and nut until the axle spacer
tube bottoms against the inside of the wheel
fork (will not turn) while the wheel and spacer
washers (if used) spin freely without binding.
Install the battery in the mower as shown in Battery
Installation photo. Connect the positive and nega-
tive cables to the proper battery terminal [red cable
and boot connects to the Positive (+) terminal].
Slide the rubber boot up and over the battery post,
making sure it covers the post completely to pre-
vent an electrical short.
18
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Assembly Instructions
Deck Discharge Shield Installation
(Side Discharge Models Only)
Grease Fitting
Locations
Attach the deck side discharge shield by positioning
the shield hinge lug in front of the deck mount and
fastening with two 3/8-16 x 1-1/4 in. bolts, 3/8-16
ESNA nuts, and 3/8 in. wave spring washers. The
wave washers fit between the two hinging surfaces.
Tighten the nuts until the shield moves freely but is
not loose.
Spacer Washer
Axle Spacer Tube
WARNING
Deck Caster Wheel Installation
DO NOT operate the machine without the
grass deflector chute attached and in the
lowest possible position.
NOTE: If semi-pneumatic wheels are installed,
make sure the spacer washers fit over the
spacer tube and are not caught between the fork
and the end of the tube. The washers should
move freely on the axle spacer tube.
Attach Shield
5. Grease the caster wheel bearings and caster
pivot bearings - one grease fitting for each
wheel and each pivot.
Deck Discharge Chute Installation
(GHS Rear Discharge Models Only)
Mount the discharge chute hinge on top of the deck
discharge opening using the 1/4-20 x 1/2 in. socket
button head bolt and 1/4-20 ESNA nut. Position the
bolt with the head inside of the chute and the nut on
the outside. Attach spring for tilt-up action from
chute to bracket on deck.
Discharge Shield Installation
on Side Discharge Deck
Carrier Frame
Tube Sockets
Attach
PTO Shaft Guard Installation
Position the shaft guard as shown and mount with
two 1/4-20 x 1/2 in. bolts.
Chute
Attach Guard
Tilt-Up Roller Wheel Installation
Mount the two (2) tilt-up roller wheels on the brack-
ets on the rear skirt of the deck housing using the
P/N 8490 axle bolt, 3/8 in. wave spring washer and
3/8-16 in. Whiz locknut. Tighten the axle bolt until
the wheel rolls freely, but is not loose.
Nut on Top
Discharge Chute and PTO Shaft Guard
Installation on Rear Discharge Deck
19
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Assembly Instructions
5. Connect the mower deck PTO drive shaft
assembly to the tractor with the splined quick
disconnect coupler. This coupler simplifies
shaft alignment and installation.
Attach Spring
a. Use the arrows on the shaft and tube to
align and slide the PTO quick coupler onto
the deck splined shaft.
b. Reaching under the tractor, pull the ring
back on the coupler, slide onto the spline
shaft on the tractor, and release the ring.
IMPORTANT: To prevent damage to the
mower, make sure the PTO shaft assembly is
securely locked on the tractor, with the locking
balls fully seated in the groove and the ring in the
full forward position (refer to the Coupler Ring
“Locked” Position photo). After installation,
pull on the shaft to check for security.
Roller Wheels
Tilt-Up Spring and Roller Wheel
Installation on Rear Discharge Deck
Mower Deck Installation on Tractor
Deck Installation
Pull Back Spring-Loaded
Coupler Ring
1. Lightly grease each deck support arm (2) on the
tractor. RefertoMowerDeckInstallationphoto
on next page for location of deck support arm.
2. Engage the deck carrier frame tube sockets on
the tractor support arms (refer to Discharge
Chute and PTO Shaft Guard Installation
photo for socket location). Slide the deck onto
the support arms: all the way if SD equipped
model, approximately 3 in. (76 mm) if GHS
equipped model.
Installing PTO Quick Coupler
NOTE: When installing the DSD52 or DSD62
Mower deck, make sure to retract the dolly
wheel after mounting the deck on the tractor.
Spring-Loaded Coupler Ring
In Fully Forward Position
3. If the deck is rear discharge (GHS equipped
model), the rear discharge chute will need to be
aligned and connected to the blower inlet dur-
ing the last 2 in. (51 mm) of slide action on the
support arms.
NOTE: Raising the mower body may be helpful
in fitting and guiding the deck chute into the
blower.
4. Install the hitch pin through the hole on the end
of each support arm to lock the deck in place
(refer to Deck Counterweight Spring Installa-
tion photo). Two (2) hitch pins are included in
the owner’s packet of materials.
Coupler Ring “Locked” Position
20
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Assembly Instructions
6. Raise the front mower body (instead of lifting
the front of deck) and clip the counterweight
springs to the receptacle on front of body.
Lower the front body to tension the springs.
(Refer to Deck Counterweight Spring Instal-
lation photo.)
7. With the counterweight springs connected, the
weight on the deck caster wheels should be
15 to 25 Ib (7 to 11 kg). Check this weight by lift-
ing on the front of the deck carrier frame. If
required, the spring tension can be adjusted by
tightening or loosening the elastic stop nuts
located underneath the lower spring hook.
Refer to Deck Counterweight Spring Installa-
tion photo.
Grease Deck
Support Arms
Spring Tension Adjustment
Nut Located Under Lower
Spring Hook (Not Visible)
PTO Connection
Arrows on Shaft and Tube
(used to align when sliding together)
Mower Deck Installation (PTO Shaft Connection)
Counterweight Springs Clip
Onto Body With Forward
Body Tilted Up
Hitch Pins
Lock Deck On
Support Arms
Deck Counterweight Spring Installation
21
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Assembly Instructions
2. Check the side-to-side level. Rotate each blade
sideways and measure the distance from blade
tip to ground on each side. If measurements
vary more than 1/8 in. (3 mm), add a washer
shim under the decksupport pins on the low side
to level the deck.
Deck Leveling
1. Position mower on a smooth, level surface. Set
the cutting height to the highest position - 4 in.
(102 mm) - for easy access under the deck to
measure blade height. Refer to ADJUSTING
CUTTING HEIGHT in Operating Instructions.
3. Check the front-to-rear level. Rotate the blades
to point forward. Measure the distance from
blade tip to ground on the front and rear. The
rear of the blade should be 1/8 to 1/4 in. (3 to 6
mm) higher than the front of the blade; shim the
rear (or front) deck support pins equally to
achieve at least 1/8 in. (3 mm) difference.
NOTE: A block of wood cut 4 in. (102 mm) high
is a convenient gauge to measure blade height
above ground during the leveling process.
WARNING
The machine must be shut off during this
procedure.
NOTE: The mower deck and support frame are
jig welded; within normal tolerances, very little, if
any, shimming should be required to level the
deck. Tire pressure will influence the levelness
of the deck. Check the tire pressure as a possi-
ble cause of the deck not being level.
4 in. (102 mm)
Wood Block
Should be 1/8 in. (3 mm)
to 1/4 in. (6 mm) higher
at the rear of the blade
Should not vary more
than 1/8 in. (3 mm)
side-to-side
4 in. (102 mm)
Wood Block
Deck Leveling
22
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Assembly Instructions
PREOPERATING CHECKLIST
CHECK ENGINE CRANKCASE OIL LEVEL
Check the engine crankcase oil level before use and
after each 5 hours of continuous operation. Refer
to LUBRICATION for Checking Engine Crankcase
Oil Level in Maintenance Instructions.
Before operating the mower for the first time, and as
a routine before daily operations, it is important to
make sure the mower is properly prepared and
ready for operation. The following is a list of items to
be checked. (For a mower with frequent operation,
some of these items will not need to be checked ev-
ery day, but the operator should be aware of the con-
dition of each.)
CHECK AND SERVICE ENGINE AIR CLEAN-
ER SYSTEM
• Check air restriction gauge to make sure there
is no red indication showing.
For proper fuels and lubricants refer to Specifica-
tions.
• Check condition, cleanliness, and security of
the complete air cleaner system (clean air filter
every 100 hours). For detailed procedures,
refer to CLEANING the Engine Air Cleaner
System in Maintenance Instructions.
FILL FUEL TANK
Fill the fuel tank with clean, fresh fuel. Clean diesel
fuel is particularly important since contaminated fuel
will damage the fuel injectors and injection pump.
CHECK ENGINE COOLING SYSTEM
NOTE: An electric fuel pump makes it unneces-
sary to bleed (purge out air bubbles) the diesel fuel
injection system when initially fueling an empty fuel
tank.
• Check the radiator air intake screen to make
sure the screen is clean and free of obstruction.
Also, the radiator cooling fins should be
inspected and cleaned if there is any buildup of
dirt or debris. (Remove the intake screen
assembly to inspect and clean.)
DANGER
• Check the coolant levels in the radiator and
overflow tank. If additional coolant is needed,
refer to CHECKING/SERVICING the Engine
Cooling System in Maintenance Instructions.
Handle diesel fuel with care. Use safe re-
fueling procedures:
• DO NOT fill fuel tank with the engine run-
ning.
• If the engine is hot, allow to cool before
refueling.
WARNING
• Use an approved fuel container.
• Fuel the mower outdoors.
DO NOT remove the radiator pressure cap
when engine is hot.
• DO NOT smoke while refueling.
• Avoid spilling fuel; use a funnel or spout.
• Check engine fan belt.
• DO NOT overfill the fuel tank; fill up to
about 1 in. (25 mm) below the top of tank.
CHECK GEAR AXLE OIL LEVEL
Refer to LUBRICATION for Gear Axle Lubrication
in Maintenance Instructions.
IMPORTANT: DO NOT permit dirt or other foreign
matter to enter the fuel tank. Wipe dirt from around
the filler cap before removing. Use a clean fuel stor-
age container and funnel.
INSPECT FIVE (5) BELTS
Engine PTO Drive, Jackshaft Drive, Hydrostatic
Ground Drive, Engine Fan Belt, and GHS Blower
Drive (if equipped).
23
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Assembly Instructions
CHECK HYDROSTATIC TRANSMISSION OIL
LEVEL
Tilt-Up Lift Handle
Tilt-Up
Latch
Refer to LUBRICATION for Checking Hydrostatic
Transmission Fluid Level in Maintenance Instruc-
tions.
Tilt-Up Latch
CHECK BATTERY ELECTROLYTE LEVEL
Tilt-Up Hook
on Deck
Refer to CHECKING/SERVICING the Battery in
Maintenance Instructions.
CHECK FUNCTIONS OF INSTRUMENT PANEL
AND WARNING HORN
Deck Lock Lever
Turn the ignition key to the RUN position. Voltmeter,
Oil Pressure Warning Light, and Warning Horn
should all operate, indicating normal function.
Deck Secured in TILT-UP Position
CAUTION
CHECK TIRE PRESSURE
Deck Caster Wheel = 20 PSI (137 kPa)
Do not operate machine with deck tilt-up
pivot joint unlocked.
Drive
Rear
=
=
15 PSI (103 kPa)
20 PSI (137 kPa)
CHECK AND CLEAN GRASS BUILDUP
UNDERNEATH MOWER DECK (and inside
GHS blower, if equipped)
DANGER
Do not operate the mower with deck in tilt-
up position. Do not move the tractor with
the deck in the tilt-up position.
Refer to CLEANING the GHS Blower in Mainte-
nance Instructions for blower cleaning information.
DANGER
CHECK MOWER BLADE CONDITION, SHARP-
NESS, AND SECURITY OF MOUNTING
Never operate cutter blades with deck in
raised position because it is hazardous.
The blade mounting nut should be tightened to
60 ft-lb (81.3 N·m). If blade sharpening is required,
refer to CHECKING/SERVICING for Sharpen
Mower Blades in Maintenance Instructions.
The tilt-up deck can be secured in the raised position
by unlocking the deck lock levers on each side of the
carrier frame and inserting the deck hook into the tilt-
up latch on the tractor body. Before operating the
tractor, make sure to re-engage the deck lock levers
after lowering the deck to the normal operating po-
sition.
CHECK DRIVE WHEEL BOLT TORQUE
The lug bolts mounting the drive tires should be
tightened to 75 to 85 ft-lbs. (101.7-115.2 N m).
ADJUST MOWER CUTTING HEIGHT, IF RE-
QUIRED
Position the hitch pins in the four deck support pins.
Refer to the “Cutting Height Adjustment” decal on
the deck gearbox cover.
PERFORM ANY ADDITIONAL PROCEDURES
called for on the MAINTENANCE SCHEDULE
CHART in Maintenance Instructions.
24
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Operating Instructions
CONTROL IDENTIFICATION, LOCATION, AND
FUNCTION
Engine Throttle
The throttle control lever (red knob) is located on the
left side of the seat and is used to control engine
speed. Moving the lever forward toward the FAST
position increases engine speed; moving it back-
ward toward the IDLE position decreases engine
speed.
Operating Controls
CAUTION
Before operating the mower, become fa-
miliar with the location and function of all
operator controls. Knowing the location,
function, and operation of these controls
is important for safe and efficient opera-
tion of the mower.
Throttle
Throttle Location
Parking Brake
Steering Levers
Front Body
Latch Release
Forward Speed Control
(FSC)
Blade Clutch
(PTO)
Operating Controls
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Operating Instructions
Forward Speed Control (FSC)
Parking Brake
Forward Speed Control (FSC) has two functions:
One is to set forward travel speed, and the other is
to establish the NEUTRAL-PARK position. When
the FSC lever is moved into the FORWARD posi-
tion, a friction lock holds any forward speed setting
from 0 to 5 mph (0 to 8 km/h). The ground speed is
proportional to the lever position; the further the le-
ver is advanced forward, the faster the tractor
moves. It is not necessary to hold the FSC in posi-
tion since the friction lock maintains the selected le-
ver position. Pulling back on the steering levers
overrides the FSC setting and slows or stops for-
ward travel. Releasing the steering levers allows
the tractor to resume forward travel at the speed set
by the FSC lever. To stop and park the machine, the
FSC lever is moved backward to the NEUTRAL-
PARK position.
The parking brake functions by locking a pin into the
hydrostatic transmission pinion gear teeth. Moving
the lever FORWARD engages the parking brake;
moving the lever BACKWARD releases the brake.
IMPORTANT: Stop the tractor completely before
engaging the parking brake. The parking brake
uses a positive mechanical lock similar to the PARK
position on an automotive automatic transmission.
If the tractor is moving when the brake is engaged, it
will result in sudden stoppage and possible internal
damage to the axle drive.
NOTE: If pressure on the parking brake pin (e.g.
parked on a hill) makes it impossible to release the
parking brake with the parking brake lever, move the
mower gently forward or backward to release the
pin.
Steering Levers
Front Body Latch Release
Each drive wheel is controlled by its own indepen-
dent steering lever, for both steering function and
FORWARD/REVERSE motion. The FSC lever sets
the maximum forward speed, and also sets the for-
ward position of the steering levers. The steering le-
vers operate only with a backward pulling
movement of the lever, which causes the drive
wheel for that lever to first slow down, stop, and then
reverse with a full backward lever stroke. The levers
are released to the FORWARD position for “straight-
ahead” ground travel.
The front portion of the tractor body hinges forward
for maintenance access and is latched down in the
OPERATING position. To raise the body, move the
latch release forward.
NOTE: Pushing forward on the steering levers will
not cause any change in tractor motion - there will
be no steering lever reaction and there will be no
machine damage.
Front Body
Latch Release
Blade Clutch (PTO)
The blade clutch lever has two positions. Pulling the
lever UP engages the PTO that drives the mower
blades. Pushing the lever DOWN disengages the
PTO and engages the blade brake.
Front Body Latch Release
NOTE: On GHS equipped models, the Powerfil ®
motor and Grass-Pak® full signal switch are activat-
ed by engaging the blade clutch. Refer to Using the
GHS Catcher in this section for a complete descrip-
tion of GHS operation.
26
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Operating Instructions
Transmission Lockout Levers
Cold Start Lever (Jackshaft Drive Belt Release)
The transmission lockout levers disengage the hy-
drostatic transmissons. By lifting the lever on top of
the transmission and locking it into place with the
lockout cam, the hydrostatic transmissions are re-
leased to permit freewheeling. By releasing the cam
and lowering the lever, the transmissions are en-
gaged for normal operation. The transmission lever
in the LOCKOUT position is used to enable moving
the machine without the engine running (e.g., for
service). Refer to TRANSMISSION LOCKOUT in
this section for operating instructions.
The cold start lever is used for starting the machine
in cold weather [below 40° F (4° C)]. Pulling the le-
ver DOWN disengages the jackshaft drive belt.
When the jackshaft drive belt is released, the hydro-
static transmissions are removed from the engine
starter cranking load.
Jackshaft Drive
Engaged
Lockout
Levers
Cold Start Lever - Normal Operating Position
Transmission
Plunger
Lockout Lever Location
NOTE: The transmission plunger on the side of the
transmission case (activated by the LOCKOUT LE-
VER) must be completely released during operation
of the mower, otherwise operation of the transmis-
sion will be erratic.
Jackshaft Drive
Disengaged
Cold Start Lever - Cold Start Position
27
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Operating Instructions
The Forward Speed Control also Establishes the Neutral-Park Position of the Steering Levers
FORWARD SPEED
CONTROL LEVER (FSC)
LEFT WHEEL
STEERING LEVER
RIGHT WHEEL
STEERING LEVER
Full Forward
Ground Speed
Position
Forward Position
(No Control Change)
Intermediate
Ground Speed
Position
Neutral-Park
Position
Neutral-Park
Position
Reverse Drive
Wheel Motion
Position
Engaged
Position
PARKING
BRAKE
Disengaged
Position
Disengaged
Position
THROTTLE
Fast
Throttle
Position
Engaged
Position
BLADE CLUTCH (PTO)
Pull Up to Engage
Idle
Position
Operating Controls (Top View from Drivers Point of View)
28
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Operating Instructions
Instrument Panel
This illustration shows the configuration of the
switches and indicators located on the instrument
panel.
Water
Temperature
Oil Pressure
Warning Light
Water Temperature
Warning Light
Ignition
Switch
Voltmeter
Gauge
Light Switch
(Optional)
Circuit Breaker - 7 Amp
(Instrument Panel)
Hourmeter
Warning Horn
Circuit Breaker - 10 Amp (Headlights, Safety
Interlock Switch System, Fuel Solenoid Hold,
Powerfil® Motor - GHS Only, “Full” Signal Horn - GHS Only)
Instrument Panel
29
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Operating Instructions
• Engine fan belt
Voltmeter
• Thermostat function
The voltmeter displays battery and charging system
voltage. An indication of low or high voltage (the red
area) indicates an electrical system failure. The
cause of the failure should be determined and cor-
rected.
Stop the engine and correct the problem before fur-
ther operation.
IMPORTANT: Continued operation of the engine
with an illuminated water temperature warning light
MAY result in severe engine damage.
Water Temperature Gauge
Ignition Switch
The water temperature gauge monitors engine
cooling system temperature. If engine coolant
temperature exceeds 230° F (110° C), an overheat
condition exists; the water temperature light will
come on and the warning horn will sound.
The ignition switch is used to start and stop the en-
gine (and preheat the diesel engine). The switch
has four positions:
is the glow plug preheat po-
sition; “O” is the OFF position; RUN is the position
the key returns to after starting; “S” is the START po-
sition. When starting the engine, turn the key clock-
wise to the “S” position. Do not hold the key in the
“S” position longer than 10 seconds. If the engine
does not start, return the key to the “O” position for at
least 60 seconds before making a restart attempt.
Prolonged cranking can damage the starter motor
and shorten battery life. Release the key when the
engine starts, and it will return to the RUN position.
To stop the engine, rotate the key counterclockwise
to the “O” position.
WARNING
If engine cooling system overheating is
indicated, continued operation of the en-
gine, even for a short time, COULD result
in fire, risk of personal injury, and severe
damage to equipment.
Oil Pressure Warning Light
NOTE: When starting the engine, turn and hold the
ignition key in the glow plug preheat position. The
time required is approximately 10 to 30 seconds, de-
pending on engine temperature. Refer to START-
ING THE ENGINE in this section.
The oil pressure warning light indicates that engine
oil pressure is below the safe operating level [below
7 PSI (48 kPa)]. This light (and warning horn) will
come on when the ignition is turned ON, but should
go off after the engine is started. If the light fails to
come on when the ignition switch is turned ON, it
could indicate a burned out bulb. If the light comes
on during engine operation, stop the engine imme-
diately and correct the source of the problem before
further engine operation.
OFF
Glow Plug Preheat
ON
IMPORTANT: Continued operation of the engine
with an illuminated oil pressure warning light MAY
cause severe engine damage (if a low oil pressure
condition exists).
Water Temperature Warning Light
The water temperature warning light indicates that
engine coolant temperature is above the safe oper-
ating limit and the engine is overheating. If this
light comes on, there may be a problem with:
START
Ignition Switch
• Radiator cooling air flow (material packed into
radiator cooling fins, clogged air intake screen)
• Low coolant quantity in cooling system
30
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Operating Instructions
Light Switch (For Optional Lights)
Operates headlights (when installed).
Hourmeter
The hourmeter displays operating time accumu-
lated while the ignition switch is in the ON position.
The hourmeter provides maintenance reminders
after certain hours of operation. The hourmeter
screen will start flashing the reminder one hour prior
to the recommended interval and will continue until
one hour after the recommended interval (two
hours). The hourmeter does not have a manual
reset function.
Hourmeter
Circuit Breakers
Two manual reset circuit breakers are located on the
instrument panel. Each has a button that pops out if
the circuit breaker trips. The 10 amp circuit breaker
protects the circuits to the headlights, fuel valve so-
lenoid, safety switch relays and time delay module,
and GHS. The 7 amp circuit breaker protects the in-
strument panel circuits to the meters, warning lights,
and warning horn.
Procedure
Interval*
Reminder
C
Oil Change
(Break-In)**
4-6 Hours
OIL
H
G
Lubricate
and Check
Levels
24-26 Hours
LUBE
Warning Horn
C
Oil Change
49-51 Hours***
OIL
H
G
The warning horn sounds to alert the operator that
an unsafe engine condition is being indicated -
when engine coolant temperature is too high or
engine oil pressure is too low. If the horn sounds,
check the indicator lights and water temperature
gauge and correct the problem before further
operation.
*
These intervals reflect the actual time that the
reminder will flash (one hour prior to and one
hour after the recommended interval).
** This reminder is only used one time.
*** In normal operating conditions, oil changes in
100-hour intervals are acceptable. Walker and
the engine manufacturers recommend engine
oil changes every 50 hours in extremely dirty
or dusty conditions or for units with less than
100 hours annual use.
STARTING THE ENGINE
CAUTION
Before operating the mower, read and un-
derstand all Safety Instructions and Operat-
ing Instructions.
NOTE: The blinking hour glass on the display
means that the meter is operating properly.
WARNING
NEVER run the engine in an enclosed or
poorly ventilated area. Engine exhaust
contains carbon monoxide, an odorless
and deadly gas.
31
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Operating Instructions
1. Before attempting to start the engine, make
sure the operator is in the seat, the Forward
Speed Control is in NEUTRAL-PARK position,
and the blade clutch and parking brake are
DISENGAGED.
3. Move the throttle 1/4 to 1/2 open (toward
FAST) and turn the ignition switch to the
START position to start the engine. Release
the key to the RUN position as soon as the
engine starts.
NOTE: Release parking brake to prevent extra
load on the starter if the transmission neutral is
slightly out of adjustment.
IMPORTANT: If the engine fails to start after
approximately 10 seconds of cranking, the
engine should be checked before further crank-
ing. Turn the key to the OFF position and allow
a 60 second cool-down period between starting
attempts. Failure to follow these guidelines can
damage the starter motor and shorten battery
life.
CAUTION
A safety interlock switch system PRE-
VENTS CRANKING the engine with either
the Forward Speed Control or the blade
clutch (PTO) out of neutral. If the engine
cranks otherwise, the safety system is not
working and should be repaired or ad-
justed before operating the mower. DO
NOT disconnect safety switches; they are
for the operator’s protection.
TROUBLESHOOTING NOTE: If the engine
cranks but does not start, check the following:
• The fuel valve solenoid is operating. Look at
the exhaust pipe when cranking the engine - no
smoke indicates no fuel is reaching the cylinder.
If the solenoid is not operating, contact your
Walker Dealer.
NOTE: For starting in cold weather [below 40° F
(4° C)], use the cold start lever to release the
jackshaft drive belt and remove the hydrostatic
transmission from the starter cranking load.
After the engine has been started and warmed
up, raise the lever to re-engage the jackshaft
drive belt.
• The glow plugs are operating. Look at the
exhaust pipe when cranking the engine - white
smoke indicates improper glow plug operation
and inadequate preheat. Consult the Kubota
Workshop Manual to check glow plug function.
4. After the engine starts, make sure the oil
pressure light goes off. If not, stop the engine
immediately and find the cause of the problem.
Make sure the oil pressure light is off prior to
engaging the mower blades and beginning
operation.
Cold Start
Lever Engaged
Jackshaft Drive Belt Release
2. Turn and hold the ignition key in the PREHEAT
position to preheat the engine glow plugs. For
temperatures below 35° F (2° C), the time
required is approximately 25 to 30 seconds. For
temperatures 35° F (2° C) or higher, the time
required is approximately 10 to 15 seconds.
32
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Operating Instructions
ADJUSTING GROUND SPEED AND STEERING
NOTE: If the FSC lever will not stay in the
selected position, the friction lock needs to be
adjusted. Contact your Walker Dealer.
IMPORTANT: If the DSD52 or DSD62 Mower
deck is installed on the tractor, make sure the
dolly wheel is retracted BEFORE moving.
2. Steer by pulling the lever on the side of desired
direction of turn, e.g., pull the LH lever to turn
left. To minimize the possibility of overcontrol,
use only one hand on both steering levers.
CAUTION
Learn to START, STOP, and MANEUVER
the mower in a large, open area.
Beginning Recommendations are:
♦ Learn operation of the mower in an open
area away from buildings, fences, and ob-
structions. Learn operation on flat ground
BEFORE operating on slopes.
If the operator has not operated a ma-
chine with LEVER STEERING OR DUAL
HYDROSTATIC TRANSMISSIONS, steer-
ing and ground operation should be
learned and practiced until the operator is
completely comfortable handling the ma-
chine BEFORE ATTEMPTING TO MOW.
♦ Start maneuvering the mower with SLOW
engine speed and SLOW Forward Speed
Control setting until familiar with all operat-
ing characteristics.
♦ Remember it is not necessary to hold the
steering levers forward (a unique Walker
feature); always PULL on the levers for
steering or for reverse motion of the mower.
DANGER
Keep feet on footrests at all times when
the machine is moving.
♦ Learn to operate the mower with your left
hand on the steering levers and right hand
on Forward Speed Control. The use of two
hands on the steering levers tends to cause
overcontrol.
1. Move the FSC out of NEUTRAL-PARK
position to the desired forward speed. DO
NOT hold forward on steering levers. It is not
necessary to hold the FSC lever in position
since a friction lock maintains the selected
lever position (and forward travel speed).
♦ Learn to operate the steering levers with
smooth action. Jerky movements are hard
on the transmission and lawn. For sharp
turns, do not allow the inside wheel to stop
and twist on the grass. Pull the steering le-
ver controlling the inside wheel into reverse
for a smooth “rolling” turn (one wheel roll-
ing forward while the other rolls backward).
WARNING
In case either of the transmission drive
belts break during operation, and if the
machine is on a slope, the machine will
freewheel down the slope. To maintain
control, immediately (1) Release the
steering levers and simultaneously (2)
Move the FSC to the NEUTRAL-PARK
position. When the machine is stopped
or moving slowly, engage the parking
brake.
♦ Practice maneuvering the mower until
you can make it go exactly where you are
aiming.
♦ Remember, for an emergency stop, or in
case of loss of control, machine movement
can always be stopped quickly by pulling
the Forward Speed Control into the NEU-
TRAL-PARK position.
NOTE: This is exactly the same procedure
used to normally stop and park the machine.
33
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Operating Instructions
ENGAGING THE MOWER
Pull Steering Levers
With Left Hand
1. Set the engine throttle at about 1/3 speed. Do
not attempt to engage the blade clutch at
high engine speeds. This will drastically
shorten drive belt life. Use only moderate
engine speed when engaging the blade clutch.
2. Pull the blade clutch lever SLOWLY up to
engage the mower blades.
CAUTION
Forward Speed Control
(FSC)
A safety interlock switch (seat switch) will
cause the engine to stop if the blade
clutch is engaged and the operator is not
in the seat. The function of this switch
should be checked by the operator rais-
ing off the seat and engaging the blade
clutch; the engine should stop. If the
switch is not working, it should be re-
paired or replaced before operating the
mower. DO NOT disconnect the safety
switches; they are for the operator’s pro-
tection.
Keep Feet On Footrest
When Moving
Correct Operator Hand Position on the Controls
3. Reverse direction of the mower by pulling both
levers backward.
NOTE: Smooth action on the steering levers
will produce smooth mower operation. Remem-
ber to keep the engine and ground speed slow
until learning the control response.
4. The FSC may be adjusted forward for faster
ground speed and backward for slower ground
speed. When mowing, ground speed should
be adjusted to match the load on the cutter
blades, i.e., as the engine pulls down in heavy
cutting, pull back on the FSC lever to reduce
ground speed. Adjusting ground speed helps
maintain a balance between engine power and
blade speed for high-quality cutting action.
IMPORTANT: DO NOT engage the blade
clutch when transporting the mower across
drives, sidewalks, loose materials, etc. DO NOT
engage the blade clutch with the PTO shaft
disconnected (the mower deck removed from
tractor).
CAUTION
5. Stop ground travel by pulling both steering
levers backward to the NEUTRAL position
(tractor not moving) and then moving the FSC
lever to the NEUTRAL-PARK position.
If the cutting blades strike a stationary ob-
ject while mowing, stop the mower imme-
diately, disconnect the electrical plug on
the fuel shut-off solenoid, lift the deck, and
inspect the deck and blades thoroughly
for damage. Make sure that the blade tim-
ing has not been disturbed (the blades
shouldbeat90degreestoeachother). Re-
fer to REPLACING/REPAIRING the Blade
Overload Shear Bolts in Maintenance In-
structions if blades are out of time. Also,
make sure the blade retaining nuts are
torqued to 60 ft-lb (81.3 N·m).
NOTE: If the tractor creeps forward or back-
ward with the FSC lever in the NEUTRAL-PARK
position, the transmission control needs to be
adjusted. Contact your Walker Dealer.
34
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Operating Instructions
IMPORTANT: DO NOT disengage the blade
clutch with high engine speed (above 1/2 throt-
tle) since the brake action on the blade drive will
cause premature wear of the brake band.
WARNING
A brake stops the cutter blades (and
blower on GHS equipped models) from
freewheeling within five (5) seconds after
disengaging the clutch. If the brake sys-
tem malfunctions and the blades do not
stop within five (5) seconds, the brake
should be adjusted or repaired before op-
erating the mower. Contact your Walker
Dealer.
Engaged
Position
4. Slow the engine to idle, put throttle in IDLE
position; and turn the ignition switch OFF.
Blade Clutch Engaged
WARNING
Remove the key from the ignition switch
when leaving the mower unattended. This
will prevent children and inexperienced
operators from starting the engine.
5. Engage the parking brake.
IMPORTANT: The hydrostatic transmissions
lock to prevent the mower from rolling freely with
the engine stopped. However, if the mower is
parked on a slope, it is necessary to ENGAGE
the parking BRAKE to prevent the mower from
creeping. This is due to a small amount of slip-
page in the hydrostatic transmissions, especially
when transmission fluid is warm.
Disengaged
Position
Blade Clutch Disengaged
STOPPING THE MACHINE
ADJUSTING CUTTING HEIGHT
WARNING
1. Slow the engine to a fast idle; put the throttle in
the 1/2 throttle position.
The engine must be stopped before ad-
justing cutting height. Disengage the
blade clutch (PTO), stop the engine, and
remove the ignition key. Wait for all move-
ment to stop before getting off the seat.
2. Pull the steering levers to the NEUTRAL
position and then move the FSC lever
backward to the NEUTRAL-PARK position.
3. Disengage the blade clutch.
35
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Operating Instructions
Cutting height is adjusted by positioning the four re-
tainer hitch pins in a series of seven vertical holes on
the deck support pins. Lift handles have been pro-
vided on each end of the deck to assist in raising the
deck while positioning the hitch pins. Cutting
heights range from 1 in. (25 mm) [top holes] to 4 in.
(102 mm) [bottom holes] in 1/2 in. (13 mm) incre-
ments.
Lockout Lever
Plunger
Depressed
Lift Handle
Cam in
LOCKOUT
Position
Deck Support
Pin
Lockout Lever - Freewheel Position
4. After moving the mower, release the locking
Hitch Pin
cam, placing the lever DOWN in the normal
OPERATING position.
Make sure the
transmission lockout plunger on the side of the
transmission case (activated by the lockout
lever) is completely released, otherwise the
transmission operation will be erratic.
Cutting Height Adjustment
TRANSMISSION LOCKOUT
Lockout Lever
IMPORTANT: DO NOT TOW this mower with the
transmission lockout engaged. Towing can produce
excessive internal pressure and damage the trans-
mission.
To move the mower with the engine NOT running
(dead battery, maintenance, etc.), the hydrostatic
transmissions are unlocked (released).
Cam in
UNLOCKED
Position
Plunger
Released
1. Raise the front body.
2. Lift the transmission lockout lever on both the
RH and LH transmissions and secure into
place with the locking cam.
3. The mower will “freewheel” with the levers in
the LOCKOUT position. The levers must be in
the highest position to completely unlock the
transmissions.
Lockout Lever - Normal Operating Position
36
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Operating Instructions
RECOMMENDATIONS FOR MOWING
• When using a side discharge mower deck, the
side discharge shield must not be removed and
must be kept in the lowest possible position to
deflect grass clippings and thrown objects down-
ward. Orient the side discharge away from side-
walks or streets to minimize cleanup of clippings.
When mowing close to obstacles, orient the side dis-
charge away from obstacles to reduce the chance of
damage to property by thrown objects.
IMPORTANT: Operate the engine at full speed
when mowing, to allow the engine to produce full
horsepower and to increase efficiency of the engine
cooling system.
• Keep the mower deck and discharge chute clean.
• Mow with sharp blades. A dull blade tears the
grass (resulting in poor lawn appearance) and uses
extra power (slowing the mowing speed).
• It is preferable to cut grass when it is dry and not
too tall. Mow frequently and do not cut grass too
short. (For best appearance, cut off 1/3 or less of
existing grass height.)
• When mowing, operate the engine at or near full
throttle for the best cutting action and performance
of the grass handling system (GHS). Mowing with a
lower engine RPM causes the mowing blade to not
cut clean and tear the grass. The engine is
designed to be operated at full speed.
Side Discharge Shield in Lowest Position
• When mowing in adverse conditions (tall and/or
wet grass), mow the grass twice. Raise the mower to
the highest setting - 4 in. (102 mm) - for the first pass
and then make a second pass cutting to the desired
height.
• When operating on a slope, reduce speed and
use caution to start, stop, and maneuver. Avoid
sharp turns or sudden changes in direction. The
maximum recommended side slope operating
angle is 20 degrees or 33% grade.
• Use a slow setting on the FSC for trimming
operations.
Maximum Recommended
Side Slope - Do Not Operate
on Steep Slopes
• Make sure the mower is leveled properly for a
smooth cut. Refer to Deck Leveling in Assembly
Instructions.
• Use an alternating stripe mowing pattern for
best appearance and vary the direction of the stripe
each time the grass is mowed to avoid wear patterns
in the grass.
• Avoid damage to the grass by slipping and skid-
ding of the drive tires. Use smooth control move-
ments of the steering levers since the hydrostatic
transmissions are “power boosted controls” and
jerking the levers can easily slip the tires. For sharp
turns, do not allow the inside wheel to stop and twist
on grass; pull inside steering lever into reverse for a
smooth “rolling” turn (one wheel rolling forward while
the other rolls backward).
Maximum Recommended Side Slope
37
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Operating Instructions
RECOMMENDATIONS FOR TILT-UP DECK
OPERATION/TRANSPORT
To avoid potential deck and/or tractor damage while
using the tilt-up deck, the following recommenda-
tions are offered:
• Do not move the tractor with the deck in the tilt-
up position since both the roller wheels (on the back
of the deck) and the GHS discharge chute may be
damaged by moving the tractor. The tilt-up configu-
ration should only be used when the tractor is
parked.
• The tractor body should never be tilted for-
ward with the deck in the tilt-up position. This can
cause the deck to unhook from the tractor and fall
with considerable force, potentially causing deck or
tractor damage and/or bodily injury.
• When transporting a tractor with the deck in the
tilt-up position (on a truck or trailer), the deck
should be secured to the vehicle with a strap or
rope (stop vertical movement). This will prevent the
deck from bouncing on the rear roller wheels (caus-
ing breakage). This will also prevent the deck from
unhooking from the tractor and falling, potentially
causing deck or tractor damage. Damage to other
items parked in front of the deck may also occur.
38
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Operating Instructions
GRASS HANDLING SYSTEM (GHS)
GHS Model Only
Exhaust Screen
(Removable)
Catcher Door
Safety Latch
Grass-Pak®
Vane Switch
Powerfil ®
Drive Motor
Exhaust
Deflector
Actuator
Rod
“Full” Signal
Horn
PTO
Clutch
Catcher
Door
Catcher
Door Spring
PTO and Blade
Gear Drive
Grass Catcher
Dump Handle
Powerfil ®
Delivery Spout
Body Chute
Assembly
Blower
Deck
Discharge Chute
Rear Discharge
Mower Deck
GHS Flow and Components
39
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Operating Instructions
NOTE: When a side discharge or mulching mow-
er deck is installed on the GHS model, a blower
intake cover should be installed in the blower intake
tube. This cover “unloads” the blower and seals
the intake to effectively eliminate power loss and
blower noise when the blower is not being used.
General Information
The Grass Handling System (GHS) consists of a
rear discharge mower deck connected to a 10 in. (25
cm) blower and a rear mounted grass catcher with
7.0 bushel (246 liters) capacity or optional 9.5
bushel (335 liters) capacity. The GHS blower oper-
ates any time the mower blade clutch is engaged
and moves grass through the rear discharge deck
chute into the grass catcher. Blower airflow is ex-
hausted out the back of the grass catcher, through a
filtering screen. When the grass catcher is full and
needs to be emptied, a “full” signal horn alerts the
operator. When the “full” signal horn sounds, it is
important to stop mowing to prevent overfilling and
clogging of the blower system.
Blower
Intake Cover
IMPORTANT: Normally, the GHS blower operates
with no maintenance or cleaning required. However,
under certain operating conditions, the inside of the
blower housing may accumulate a deposit of dirt,
causing wear and binding of the blower wheel.
Normally, dirt buildup occurs when mowing a com-
bination of dirty and damp grass, especially in
the springtime. When operating in these condi-
tions, check the blower wheel frequently for
binding and clean the blower housing as required.
Refer to CLEANING the GHS Blower in Mainte-
nance Instructions.
Blower Intake Cover
NOTE: An alternative to using the blower intake
cover when a side discharge or mulching deck is
installed on a GHS model is the blower lockout kit
(P/N 6541). The blower lockout kit releases ten-
sion on the blower drive belt and does not require
the blower intake cover.
DANGER
NOTE: In Autumn, when using the GHS mower to
vacuum leaves, it is recommended to raise the front
of the mower deck 2 to 3 notches [1 to 1-1/2 in. (25
to 38 mm)] higher than the rear. This will avoid
“bulldozing” leaves, particularly when the leaves
are piled in a thick layer. To make this adjustment,
the hitch pins in the two (2) front deck support pins
are repositioned 2 to 3 notches higher while leaving
the rear pins in their original position.
ROTATING BLOWER BLADES
NEVER operate the GHS blower with the
blower discharge chute uncovered (grass
catcher in the dump position) since dan-
gerous projectiles may be thrown. NEVER
put hands into the blower discharge chute
for any reason. Use a stick or similar in-
strument to remove any material if clog-
ging has occurred.
DANGER
NEVER operate the GHS catcher with the
back door open. Objects may be thrown
out the back of the catcher with sufficient
force to cause serious injury to bystand-
ers or property damage.
CAUTION
NEVER leave grass clippings in the grass
catcher after mowing. Damp clippings
generate heat as they decompose. This
MAY cause spontaneous combustion.
40
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Operating Instructions
• Check the amount of flat section remaining at
blade tip. This is the area that is ground away (re-
moved) when the blades are sharpened. If too much
of the flat section is removed, the “air lift” perfor-
mance or “shovel” effect of the blade deteriorates to
the point that discharge of grass clippings into the
blower chute is marginal. Replace cutter blades if
less than 3/4 in. (19 mm) flat section remains at the
blade tip.
Clogging Checklist
In case of clogging, there will be a distinct change
in the sound of the blower, i.e., the blower sound
will stop. Also, the mower deck will begin to leave a
trail of grass clippings. When this occurs, stop the
engine, disconnect the electrical plug on the fuel
shut-off solenoid, and make sure all movement
has stopped before attempting to unclog.
• Check that the interior of the deck housing and
baffling is reasonably clean and free of grass and
dirt buildup. While some degree of material buildup
can be tolerated, a point is finally reached where the
flow of air and grass clippings is restricted.
DANGER
NEVER place hands under the mower
deck or in the GHS blower discharge
chute. Use a stick or similar tool to re-
move any clogged material.
NOTE: One condition that quickly causes a
buildup of material in the deck housing is mowing
grass and/or weeds which are “juicy.” The material
collects under the deck with sticky, green juice. Clo-
ver and weeds are especially a problem. The mow-
er deck will need to be cleaned frequently when op-
erating in these conditions.
Normally, any clogging will first develop at the back
of the mower deck in the discharge opening into the
blower chute. Clogging at this point does not indi-
cate a particular problem in this part of the
system, but is a symptom of something restrict-
ing the flow of material throughout the entire
system. The following list of items should be
checked if a pattern of clogging begins to develop.
All of these items are capable of causing clogging at
the back of the deck.
• Check the deck cutting height setting. When
working in thick, tall grass, lower deck settings
[1 to 2 in. (25 to 51 mm) cutting heights] tend to
restrict airflow from moving into and under the
deck. Raising the deck cutting height will signifi-
cantly increase airflow and reduce clogging when
working in thick, tall grass.
• Check to see if the RH and LH mower blades are
installed for the correct rotation - install blades so
the cutting edges move toward each other.
• Check the interior of the chute connecting the
mower deck to the blower for smoothness and
freedom from obstruction.
Blades Must Operate at
Right Angles (90 Degrees)
FORWARD
• Check the blower wheel for bent blades and
excessive clearance between the blade tip and the
blower housing. A clearance greater than 1/8 in.
(3 mm) will cause a significant loss of blower
performance.
• Check the blower discharge chute into the grass
catcher for smoothness and freedom from ob-
struction.
• Check the elbow inside the grass catcher for a
buildup of material in the radius of the elbow. In
certain conditions (damp/dirty grass) a considera-
ble “clump” of material can accumulate at this point,
greatly restricting material and airflow.
Mounting Nut
Torque = 60 ft-lb
Rear Discharge
Chute
(81.3 N m)
Blade Rotation for GHS Mower Deck
(view from underneath)
41
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Operating Instructions
• Check that the openings in the removable air
exhaust screen in the grass catcher are not
plugged. If the screen is clogged, refer to Cleaning
the GHS Exhaust Screen in this section.
WARNING
DO NOT test the Grass-Pak® switch with
the engine running. Projectiles may be
thrown out of the grass delivery spout,
and COULD cause serious injury.
Remember, anything that restricts airflow or material
flow along the entire path from the mower deck to
the grass catcher can cause clogging.
Using the Tilt-Up Deck
The “full” signal horn is designed to operate (sound)
when the grass catcher is almost full. The timing of
the signal is adjustable by changing the position of
the vane on the Grass-Pak® switch. If the signal is
coming on too soon (catcher not completely full) or
too late (grass clogging in catcher spout and deliv-
ery chute), refer to ADJUSTMENTS for GHS Signal
Horn Adjustment in Maintenance Instructions.
Refer to CLEANING of Grass Buildup in Mower
Housing in Maintenance Instructions.
Using the GHS Catcher
Powerfil ®
The GHS catcher has an oscillating grass delivery
spout (POWERFIL®) which is designed to spread
grass clippings throughout the interior of the grass
catcher (even when mowing wet, heavy grass). The
oscillating action may be checked by turning the
ignition switch to the ON position and moving the
blade clutch to the ENGAGED position. The spout
should oscillate approximately 25 cycles per
minute.
NOTE: The horn signal should be adjusted to
sound BEFORE the catcher is completely full to
give the operator time to react and stop mowing. An
indication the horn signal is coming on too late (de-
layed too much) is if grass clippings are falling out of
the grass catcher delivery chute when the catcher is
dumped.
Cleaning the GHS Exhaust Screen
NOTE: If the grass spout fails to oscillate, the
clutch switch should be checked for function (the
switch closure is adjustable).
To remove the grass catcher screen for cleaning,
open the catcher door, push forward and pull down
on the grass catcher screen knobs (on either side of
the screen), and slide the screen out. Use a high
pressure washer or water spray and brush to clean
the screen.
“Full” Signal Horn
The GHS catcher has a “full” signal horn to alert
the operator to dump the catcher when it is full (to
prevent overfilling and clogging). The “full” signal
horn is activated by a vane switch (Grass-Pak®
switch) mounted on the grass delivery spout. Oscil-
lating action of the spout triggers the vane switch as
grass begins to fill in around the spout when the
catcher is almost full.
Keeping the catcher exhaust screen clean and open
is essential to good performance of the catching
system. In some mowing conditions, e.g., wet and
dirty, it will be necessary to clean the screen fre-
quently to avoid clogging the mower deck, blower,
and chutes due to airflow restriction.
The “full” signal function may be checked by turning
the ignition switch ON, engaging the blade clutch
(engine not running), opening the catcher back door,
and triggering the Grass-Pak® vane by hand as it
oscillates. The horn should sound as the switch is
moved in both directions.
42
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Operating Instructions
Grass Catcher
Screen
Safety
Latch
Removal
Knobs
(Not Visible)
Catcher Door Safety Latch
Grass Catcher Screen Removal for Cleaning
Using the Dump Bag
Dumping the Catcher
1. Open the back door by lifting on the door
handle.
For dumping, the catcher either tailgate dumps into
a disposal area or dumps into the optional dump
bag. The dump bag is a reusable nylon fabric bag
designed to conveniently move grass clippings from
the catcher to a remote disposal area or container.
NOTE: To prevent accidental door closure,
a safety latch locks the door open in the
fully opened position while the catcher is be-
ing dumped.
2. Orient the dump bag with one of the handle
straps on the bag opening facing up.
Tailgate Dumping
1. Open the back door by lifting on the door handle.
Tailgate
Door
Handle
NOTE: To prevent accidental door closure,
a safety latch locks the door open in the
fully opened position while the catcher is be-
ing dumped.
2. Tilt the catcher back to dump by lifting on the
catcher lift handle on the lower front corner of
the catcher.
3. Lower the catcher smoothly down to the normal
operating position. DO NOT allow the catcher
to drop down.
Hook Bag
on Bumper
4. Close the door by holding the door handle
with the left hand and releasing the safety
latch on the door hinge mechanism with the
right hand. The safety latch is released by
pressing in on the top of the latch. Then,
smoothly close the door, working against the
spring pressure that holds the door closed.
DO NOT let the door slam shut by releasing
the door before it is closed.
Positioning Dump Bag on Catcher
43
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Operating Instructions
3. Hook the bottom of the bag over the rear
bumper while lifting on the handle strap.
Power Dump Option
When equipped with the optional power dump sys-
tem, the operator dumps the catcher while sitting in
the seat. A toggle switch operating a power ram is
used to raise and lower the catcher. The back door
automatically opens and closes during the dump
cycle.
4. Tilt the catcher back to dump into the bag by
lifting on the catcher lift handle on the lower
front corner of the catcher with the one hand
while continuing to hold up on the bag strap
with the other hand. Refer to photos for posi-
tioning the bag and dumping.
Hold the toggle switch UP or DOWN to RAISE or
LOWER the catcher. When the catcher reaches the
full raised or lowered position, the power ram clutch
will make a ratcheting sound. Release the toggle
switch as soon as this sound is heard. DO NOT op-
erate the ram with the clutch ratcheting for an
extended time as this will cause extra wear on the
clutch mechanism.
CAUTION
The operator should be in the seat and
bystanders stay clear when the power
dump is operating. The power dump is
used ONLY for tailgate dumping. Do not
attempt to use the optional dump bag or
any other bag with the power dump.
Catcher Lift/
Dump Handle
NOTE: If grass tends to hang up in the catcher af-
ter raising the catcher with the power dump, “jiggle”
the steering levers and make the tractor bounce a lit-
tle to unstick the grass and make it slide out of the
catcher.
NOTE: With the power dump mechanism in the
normal operating position (catcher down), the
catcher can be manually raised for access to the
engine and the catcher can be manually dumped.
Dumping Catcher into Dump Bag
5. Lower the catcher smoothly down to the normal
operating position. DO NOT allow the catcher
to drop down.
6. Close the door by holding the door handle
with the left hand and releasing the safety
latch on the door hinge mechanism with the
right hand. The safety latch is released by
pressing in on the top of the latch. Then,
smoothly close the door, working against the
spring pressure that holds the door closed.
DO NOT let the door slam shut by releasing
the door before it is closed.
44
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Operating Instructions
Door Actuator
Arm
Grass Catcher
Catcher Door
Gas Spring
Cable
Guide
Lift Channel
Rear Body
Panel, RH
Power Dump
Ram Actuator
Fork
Catcher Door
Cable Rod
Guide
Cable Assembly
Rear Body
Panel, LH
Gas Spring
Actuator Mount
Assembly
Dog Leg
Assembly
Rubber
Bumper
Power Dump Components
45
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Maintenance Instructions
CAUTION
Maintenance procedures requiring special training or
tools should be performed by a trained technician.
MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL MDD
25
Hours
100
Hours
200
Hours
Every
Yearly 2Years
Ref.
Page
Service Item
Daily
Check Engine Crankcase Oil Level
Check Coolant Level in Radiator
and Overflow Tank
x
x
48
60
Clean Radiator Screen and Cooling Fins*
Check Security of Air Filtration Components
Check Air Filter Restriction Gauge
Clean Grass Buildup Under Deck
Clean GHS Exhaust Screen*
x
x
x
x
x
x
x
57
61
56
58
42
59
62
Clean GHS Blower*
Service Mower Blades
Check Functions of Instrument Panel and
Warning Horn
x
24
Lubricate Grease Fittings and Oil Points*
Check PTO Gearbox Oil Level**
Check Battery Electrolyte Level
Check Hydrostatic Transmission Fluid
Check Tire Pressure
x
x
x
x
x
49
53
61
54
61
Check Drive Belts (Jackshaft, Engine PTO,
x
x
63
GHS Blower, Ground Drive and Engine Fan Belt)
Check Gearbox Oil Seals
Check Turbine Precleaner*
Check/Clean Air Filter Element***
Change Engine Crankcase Oil ∆
Check Fan Belt Tension
63
55
56
48
60
63
53
59
48
63
63
x
x
x
x
x
x
x
x
Check Blade Brake Action
Check Oil Level in Gear Axle
Clean Hydrostatic Transmission Cooling Fins
Change Engine Oil Filter
Check Radiator Hoses and Clamps
Check Fuel Lines and Clamps
x
x
Replace Air Filter Element and
Vacuator™ Valve***
x
56
Replace Fuel Filters
Flush Radiator and Change Coolant
Service Battery
x
x
x
70
58
61
Check/Adjust Vertical Position of
x
72
Grass-Pak® Switch
Change Gear Axle Oil ∆∆
Replace Radiator Hoses and Clamps
Replace Fuel Lines and Clamps
x
x
x
53
63
63
More often in extremely dusty or dirty conditions (refer to notes about air cleaner element in
IMPORTANT TIPS FOR CARE OF KUBOTA ENGINE)
Change PTO gearbox oil after first 100 hours of operation (break-in period)
Air cleaner is remote mounted Donaldson Radialseal™ unit, replace filter every year or after 6 cleanings
Change engine oil and filter after first 35 hours of operation of a new engine (break-in period)
∆
∆∆ Change every 2 years or 1000 hours
46
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Maintenance Instructions
KUBOTA TIPS
IMPORTANT TIPS FOR CARE OF THE KUBOTA
ENGINE
• Maintain proper fluid levels in the radiator and
overflow tank.
• Operate the engine at full speed when mowing.
This will allow the engine to produce full horsepower
and move more cooling air through the radiator.
Fuel System
• Fuel must be clean - free from water, dirt, and or-
ganic material. Fuel contamination will greatly short-
en the life of the fuel injection pump and injectors.
Air Cleaner System
• Use only Donaldson air cleaner elements. After-
market elements may not seal in the air cleaner
housing, allowing dirt to enter the engine. Also, af-
termarket filters often skimp on the filtration media
and require more frequent cleaning and replace-
ment (see following instructions).
• Change fuel filters on a regular basis and when
contamination is suspected or found in the fuel.
• Model MDD is equipped with an electric fuel
pump; therefore it is normally not necessary to bleed
air out of the fuel system (after running out of fuel or
fuel system maintenance).
• Use the air flow restriction gauge to indicate the
• When checking and bleeding the fuel system use
the air vent plug on the fuel filter and the injector
pump. DO NOT attempt to bleed the fuel system by
loosening fuel lines on the fuel injection pump as this
could damage the pump.
need to service the air filter.
• DO NOT overservice or frequently “disturb” the
air filter. A dirty air filter actually cleans better than
a new one. Changing and cleaning the filter too of-
ten can actually reduce filter efficiency and increase
the opportunity for traces of dust to enter the engine.
Wait until the element really needs servicing as indi-
cated by the air flow restriction gauge.
Starting/Stopping
• DO NOT use ether or any starting fluid in the
air intake. This will damage the engine.
• Do frequently check the Turbine Precleaner for
• For starting in cold weather [below 40° F (4° C)],
use the cold start lever to release the hydrostatic
transmissions from the starter cranking load.
free movement of the internal fan.
• When the air filter element is removed or re-
placed, make sure all dust is cleaned out of the air
cleaner housing and hose. Use a damp cloth and
wipe the interior of the canister and hose clean (a
little dirt left here will be sucked into the engine and
reduce engine life). When the filter is reinstalled,
make sure the element is held tight and straight
in the canister for proper seating and sealing.
• Start engine with the throttle advanced off idle
(1/4 to 1/2 throttle). This will aid starting, especially
in cold weather.
• Keep the battery fully charged.
• Match crankcase oil viscosity to the ambient tem-
perature, allowing the engine to crank faster and
start easier.
• Periodically check the air intake hose for cuts,
nicks, etc., and the hose clamps for tightness.
• Allow engine to run at idle for a few seconds be-
fore stopping engine to avoid run-on or backfiring.
Oil
• Use any top quality oil with an API classification of
CD or greater. DO NOT use oil that is rated for gas-
oline engines only (API SE/SF) as this will cause
problems in a diesel engine.
Cooling System
• Fill the cooling system with a pre-mixed solution
of 50/50 antifreeze (ethylene glycol) and distilled
water.
• Single viscosity or multi-viscosity oils may be
used with the viscosity matching ambient tempera-
tures for the engine operating conditions. This will
aid starting in cold weather and assure proper lu-
brication in hot weather.
IMPORTANT: Solution must be pre-mixed before
putting it in the engine (adding pure antifreeze into
the radiator may cause damage to the engine by
causing overheating).
• Use only Kubota oil filters. Aftermarket filters
may not seal properly and/or have the incorrect
pressure relief valve for proper lubrication.
47
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Maintenance Instructions
LUBRICATION
LUBRICATION
IMPORTANT: DO NOT operate engine without
a sufficient oil supply in the crankcase. DO NOT
operate with the oil level below the lower mark or
above the upper mark on the dipstick.
WARNING
DO NOT attempt to lubricate the machine
with the engine running. Disengage the
PTO clutch, shut off the machine, and re-
move the ignition key.
5. If additional oil is needed, refer to Specifications
for proper crankcase lubricant. Fill up to, but
not above, the upper mark on the dipstick.
IMPORTANT: DO NOT overfill the crankcase
(oil above upper mark) as this CAN result in
engine overheating, loss of power, and possi-
ble engine damage.
Proper lubrication is an important maintenance pro-
cedure. It reduces wear and makes the machine
quieter and easier to operate.
Engine Oil
Engine Break-In Oil
No special break-in oil is required. The engine is
serviced with 10W-30, Service Class SG oil from the
factory. Change the oil after the initial engine break-
in period of 35 hours. Thereafter, change oil after
every 100 hours of operation.
Upper Mark
Checking Engine Crankcase Oil Level
Check the engine crankcase oil level before use and
after each 5 hours of continuous operation.
IMPORTANT: The importance of checking and
maintaining the proper crankcase oil level cannot be
overemphasized. Check the oil level BEFORE
EACH USE.
Lower Mark
Dipstick Operating Range
1. Park the mower on a level surface with the en-
gine stopped. Also, make sure the engine is
cool and oil has had time to drain into the sump
[allow at least five (5) minutes after stopping
the engine].
Changing Engine Crankcase Oil/Oil Filter
Change the engine crankcase oil after every 100
hours of operation and replace the oil filter every
other oil change (every 200 hours of operation).
IMPORTANT: NEVER check or add oil with the
engine running.
1. Park the mower on a level surface with the en-
gine stopped. The engine oil should be warm
before draining. If not warm from operation,
start the engine and run a few minutes to warm
the oil.
2. Before removing the dipstick, clean the area
around the dipstick to keep any dirt or debris out
of the engine.
2. Before removing the dipstick and oil fill cap,
clean the area around them to keep any dirt or
debris out of the engine.
3. Remove the dipstick, wipe off with a clean rag,
then reinsert the dipstick into the tube and press
all the way down.
3. Removethedipstick, oilfillcap, andoildrainplug
and drain the oil into a suitable container. Be
sure to allow ample time for complete drainage.
4. Remove the dipstick again and check the oil lev-
el on the dipstick. The oil level should be within
the “Operating Range” on the dipstick (between
the lower mark and the upper mark).
48
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Maintenance Instructions
LUBRICATION
7. Install the new oil filter on the engine. Turn the
filter clockwise until the rubber gasket contacts
the sealing surface, then tighten the filter an
additional 1/2 turn.
8. Reinstall the drain plug. Make sure it is tight-
ened to 10 ft-lb (13.6 N·m).
9. Fill the crankcase with new, clean oil. Use only
crankcase lubricants recommended by the en-
gine manufacturer. Refer to Specifications in
this manual or the engine owner’s manual. Use
the recommended oil viscosity for the expected
ambient temperature. Oil with the correct vis-
cosity will aid starting in cold weather and as-
sure proper lubrication in hot weather. Fill up
to, but not above, the upper mark on the dip-
stick. Crankcase capacity is 3.1 quarts (2.9 li-
ters) plus 1/2 pint (.24 liters) for the new oil filter.
Drain Plug
Oil Drain Location
(view from left side of tractor)
4. Before removing the oil filter, clean the area
around the filter to keep dirt and debris out of
the engine.
IMPORTANT: DO NOT use oil that is rated for
gasoline engines only (API SE/SF). This will
cause problems with a diesel engine.
IMPORTANT: Check the dipstick reading be-
fore adding the last 1/2 pint of oil and fill only to
the upper mark. DO NOT overfill the crank-
case (oil above upper mark) as this CAN result
in engine overheating, loss of power, and pos-
sible engine damage.
Oil Filter
10. Start the engine and check for oil leaks around
the oil filter. Stop the engine, recheck the oil
level, and add oil if necessary. (When the en-
gine is first operated with a new oil filter, the oil
level drops slightly as the filter is filled with oil.)
Grease Fitting and Oil Point Lubrication
Oil Filter Location
Lubricate the grease fittings and oil points after ev-
ery 25 hours of operation. Lubricate more often
when operating in dusty or dirty conditions. Use
SAE general purpose lithium or molybdenum base
grease for grease fittings and light machine oil (SAE
10) to lubricate oil points. Lubricate the locations
shown in the Chassis and Deck Lubrication
Points illustration.
5. Remove the old oil filter and wipe off the filter
mounting surface on the engine.
6. Apply a thin coating of clean oil to the rubber
gasket on the replacement oil filter.
IMPORTANT: Use ONLY oil filters from the en-
gine manufacturer (Kubota 15841-32439). Af-
termarket oil filters may not seal properly and/or
may not have the correct pressure relief valve
for proper lubrication. Also, the filter length di-
mension is critical for tailwheel clearance.
NOTE: PTO universal joints (on the deck and trac-
tor) require routine lubrication after every 8 hours
of running time.
49
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Maintenance Instructions
LUBRICATION
Ident
No.
Lubrication
Type
No.
Places
Ident
No.
Lubrication
Type
No.
Places
Location
Location
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*
Gearboxes are permanently lubricated and
sealed requiring no scheduled lubrication.
Oil level should be checked only when an oil
leak is noted. Refer to Mower Deck Gear-
box Lubrication in this section.
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*** Refer to Gear Axle Lubrication, Engine
Oil, Tractor PTO Gearbox Lubrication, and
Hydrostatic Transmission Fluid in this sec-
tion.
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50
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Maintenance Instructions
LUBRICATION
1
2
3
2
1
4
4
5
6
7
6
8
6
9
7
6
8
10
12
13
12
11
14
15
16
17
13
18
30
23 & 32
31
18
20
19
30
29
28
21
23
22
27
24
25
26
25
Chassis and Deck Lubrication Points
51
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Maintenance Instructions
LUBRICATION
Mower Deck Gearbox Lubrication
NOTE: In case the gearboxes are completely
drained of oil, approximately 5 fl. oz. (15 cl) of oil
per gearbox is required to refill the gear drive
assembly.
NOTE: These instructions apply to all mower
decks with gear-driven blades. Refer to DSD52 or
DSD62 Mower Deck Lubrication in this section for
the DSD52 or DSD62 deck with belt-driven blades.
NOTE: Since the gearboxes are connected as
a unit by connector tubes, it is necessary to add
oil slowly. Allow a few minutes after adding oil
for the oil to flow throughout the assembly and
the oil level to stabilize before reassembly.
The mower deck gearboxes (tee gearbox and blade
drive gearboxes) are connected as a unitized as-
sembly, and oil flows freely between them. The gear-
boxes are permanently lubricated (oil filled) and
sealed requiring no scheduled lubrication. Howev-
er, the gearbox oil seals should be checked every
25 hours for indication of an oil leak; particularly
the lower seals on the blade drive gearboxes
should be inspected, since they operate in a dirty en-
vironment. If an oil leak is noted, replace the oil seal
and relubricate the gearbox assembly as follows:
IMPORTANT: DO NOT overfill the deck gear-
boxes. The gearbox assembly is not vented,
and overfilling with oil will cause excessive pres-
sure and result in oil leaks.
5. Check condition of the cover gasket and replace
if worn or damaged. Reinstall gearbox cover
plates; torque screws to 24 in-lb (2.7 N·m).
1. Remove gearbox cover (footrest). Deck orien-
tation should be the normal operating position.
DSD52 or DSD62 Mower Deck Lubrication
There are several special lubrication requirements
for the DSD52 or DSD62 mower deck in addition to
the requirements detailed in the Chassis and Deck
Lubrication illustration. Lubricate the locations
shown in the Blade Spindle Lubrication and Gear-
box, Dolly Wheel, and U-Joint Lubrication photos
and check and maintain oil in the belt drive gearbox.
Blade Drive
Gearboxes
1. Lubricate the blade spindles every 25 hours
with two (2) shots of SAE general purpose lithi-
um or molybdenum base grease.
Tee
Gearbox
Blade
Spindles
Mower Deck Gearboxes
(shown with gearbox cover removed for clarity)
2. Clean the area around the individual gearbox
cover plates to prevent contaminants from en-
tering the gearcase.
3. Remove the screws securing the cover plates
on the blade drive gearboxes.
4. Check the level of lubricant in the gearboxes. If
the lubricant is low, add SAE E.P. (Extreme
Pressure) 90W oil until the oil level is up to (sub-
merges) the horizontal shaft in the gearbox
(shaft parallel to cover plate).
Blade Spindle Lubrication
52
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Maintenance Instructions
LUBRICATION
2. Check the oil level in the belt drive gearbox
every 100 hours (or sooner if a visible oil leak
has developed). With the deck in the normal
operating position, remove the level plug in the
side of the gearcase. Add SAE E.P. (Extreme
Pressure) 90W oil to maintain the oil level to the
plug. If the oil level is low, check the gearbox for
any indication of an oil leak. If an oil leak is
noted, the gearbox will need to be removed and
rebuilt.
Jackshaft
PTO
Gearbox
Dipstick
3. Lubricate the dolly wheel pivot every 25 hours
with general purpose grease.
4. Lubricate the U-Joint in the drive shaft every
8 hours with SAE general purpose lithium or
molybdenum base grease.
Dipstick Location, Tractor PTO Gearbox
Changing Gearbox Oil
The tractor PTO gearbox is oil filled and vented. No
scheduled oil change is required. However, chang-
ing the oil after the first 100 hour break-in period
will extend gearbox life and is recommended.
Belt Drive
Gearbox
1. Remove the drain plug in the bottom of the
gearcase, drain the oil, and reinstall the plug.
2. Refill the gearbox through the dipstick stand-
pipe using 7 to 8 fl. oz. (21 to 24 cl) of SAE E.P.
(Extreme Pressure) 90W gear lube.
Dolly Wheel
Level Plug
Pivot
U-Joint
3. Check that the oil level is at the FULL mark on
the dipstick. DO NOT overfill.
Gearbox, Dolly Wheel, and U-Joint Lubrication
Gear Axle Lubrication
• The gear axle oil lubrication is SAE 80W-90 (API
GL-5) gear lube.
Tractor PTO Gearbox Lubrication
Checking Gearbox Oil Level
• Check the axle oil level after every 100 hours of
operation by removing the oil level plug. If additional
oil is needed, remove the breather vent on top of ax-
le and fill until oil is at the level plug.
Check the gearbox oil level every 25 hours, and if
necessary, add oil [SAE E.P. (Extreme Pressure)
90W gear lube] to maintain oil level to the FULL
mark on the dipstick.
• Change axle oil every 1000 hours or two (2)
years.
IMPORTANT: DO NOT overfill the PTO gearbox to
avoid oil leakage out of the dipstick standpipe.
If the oil level is low, check the gearbox for any indi-
cation of an oil leak. If an oil leak is noted, the gear-
box will need to be removed and rebuilt.
53
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Maintenance Instructions
LUBRICATION
Hydrostatic Transmission Fluid
b. If no fluid leaks from around the air bleed
plug:
Checking Hydrostatic Transmission Fluid Level
*
Slowly add fluid into the reservoir until
fluid starts to leak from around the plug.
(Transmissions are serviced from the
factory with Mobil 1 (15W50) Synthet-
ic Oil). When it is necessary to add flu-
id, refer to Specifications for the proper
fluid.
Hydrostatic transmission fluid level should be
checked every 25 hours of machine operation. It is
preferable to check the fluid level when fluid is
cold. Check fluid level as follows:
1. Park the mower on a level surface. Stop the
engine and wipe dirt and contaminants from
around the reservoir cap and air bleed plug.
*
As soon as there is fluid leaking from
around the air bleed plug, tighten the
plug and fill the reservoir to the COLD
level mark. Wipe any excess oil off of
the transmission housing.
IMPORTANT: Before removing the reservoir
cap, clean any dirt from around it. Any dirt or
contaminants entering the transmission will ac-
celerate wear and eventually cause loss of pow-
er to the drive wheels.
IMPORTANT: DO NOT overfill the transmission
reservoir. This will result in oil leaking out of the res-
ervoir cap vent when the transmission warms up. It
is preferable to add fluid to the transmission when it
is cold and make sure the oil is not above or be-
low the COLD level mark.
2. Remove the reservoir cap and check the level
of the fluid. The reservoir has a fluid level COLD
mark and HOT mark. The reservoir oil level
should ALWAYS be at or above the COLD
mark and NEVER above the HOT mark.
IMPORTANT: The transmission reservoir has a fine
mesh screen in the bottom to trap dirt and foreign
particles from entering the transmission. When fill-
ing the reservoir, fluid will flow quite slowly through
this screen; so it is essential that there is fluid at the
bleed plug before the transmission is considered
full.
Reservoir Cap
IMPORTANT: Any attempt to remove or in any way
alter the filtering screen in the transmission reservoir
could cause damage to the transmission and will
VOID any transmission warranty.
Hot
Level
Air Bleed
Plug
Cold Level
Transmission Reservoir
and Air Bleed Plug Location
3. If the fluid is below the COLD mark (or the trans-
mission is not performing properly), loosen the
air bleed plug (located on the top of transmis-
sion case next to the plastic reservoir).
a. If a small amount of fluid leaks from around
the air bleed plug:
*
*
The transmission is full of fluid.
Tighten the plug and fill the reservoir to
the COLD level mark.
54
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Maintenance Instructions
CLEANING
CLEANING
dust from the air, giving the initial stage of air clean-
ing. Dust particles are exhausted through a single
small vent in the side of the housing. Since no dust
is trapped, the precleaner operates without clean-
ing. The only maintenance required is to check the
operation of the internal fan every 100 hours. Verify
operation:
Engine Air Cleaner System
There are two main components in the engine air
cleaner system: a turbine precleaner and a Donald-
son Radialseal™ air cleaner. Each component is
checked, cleaned and maintained on a different
schedule based on the filtering action required.
Each component is serviced as follows:
1. Look into the exhaust vent while shining a light
into the intake.
Turbine Precleaner
2. Start the engine and watch the fan begin to spin
as the throttle is advanced.
The turbine precleaner is mounted on a remote air
intake tube connected to the Donaldson air cleaner.
A spinning fan driven by the intake airflow separates
If the fan is not spinning, service or replace the pre-
cleaner as required.
Donaldson Air
Cleaner Cover
Air Restriction
Gauge
Turbine Precleaner
Hose
Clamp
Vacuator™
Valve
Air Cleaner
Cartridge
Precleaner Tube
Safety Filter
Donaldson
Air Cleaner
Hose
Clamp
Air Intake
Hose
Hose
Clamp
Engine
Engine Air Cleaner System Components
55
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Maintenance Instructions
CLEANING
Donaldson Radialseal™ Air Cleaner
Push Button to Reset
Indicator After Service
A remote mounted Donaldson Radialseal™ air
cleaner provides the air filtering function. The paper
filter element slides over an outlet tube inside the air
cleaner canister with radial sealing action, eliminat-
ing the possibility of dust leaks due to improper filter
installation. Intake design, internal baffling, and a
Vacuator™ valve provide dust separation and auto-
matic precleaning action. Daily or frequent servicing
of the air cleaner is not required. Use the air re-
striction gauge on the air cleaner outlet to indicate
when the air filter needs servicing -- a red flag will
appear when the filter is overly restricting airflow into
the engine.
Air Restriction
Gauge
Air Restriction Gauge Location
IMPORTANT: Use only Donaldson air filter ele-
ments for replacement (Donaldson P822686 or
Walker 5090-1). Aftermarket filters may not seal
properly or filter efficiently.
Clean and inspect the paper element after every
100 hours of service and replace the element year-
ly or after six (6) cleanings (or when dirty or dam-
aged). More frequent cleaning may be required
when operating in extremely dusty conditions as in-
dicated by the air restriction gauge. Service the air
cleaner as follows:
Cover
Canister
1. Release the top and bottom cover latches and
remove the air cleaner cover. Wash the cover
and Vacuator™ valve. Check that these com-
ponents are in good condition. The Vacuator™
valve is subject to wear and deterioration and
should be replaced yearly or when damaged.
The lips of the valve should close and fit togeth-
er; any cracks, deformation, or wear in the valve
is cause for replacement.
Vacuator™
Valve
Radialseal™
Filter Element
Cover Latch
2. Remove the filter element by pulling it out of the
canister. There will be some initial resistance as
the filter seal breaks loose and slides off of the
outlet tube. Gently move the end of the filter up
and down and side to side or twist to loosen the
seal. Use gentle action to minimize the amount
of dust dislodged as the filter is removed.
Air Cleaner Components
(shown with cover being removed)
IMPORTANT: The Donaldson air cleaner uses a
dry paper-type filter element. NEVER apply oil to
the paper element.
3. Clean the filter element using low pressure
compressed air [less than 100 PSI (689 kPa)].
Blow out the filter from the interior of the ele-
ment while turning the element.
NOTE: Washing the element in water or clean-
ing solution is not recommended. Replace the
element if it does not clean up with compressed
air.
56
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Maintenance Instructions
CLEANING
4. Use a bright light inside the element to inspect
for damage. Check the element very carefully
for pin holes or other damage that will allow
dirt to leak through the paper media. Replace
element if necessary.
9. Install the cover with the word “TOP” properly
oriented to the top of the canister. Give the cov-
er a slight twist as it reaches the canister to
make sure the tab inside the cover goes into a
slot, otherwise the cover will not fit properly.
Make sure both the top and bottom cover latch-
es are securing the cover in place.
5. Check the condition and resilience of the radial
sealing surface (inside of the open end) of the
filter. Replace the filter if any cracks, tears, or
other damage to the sealing surface are noted.
Cover Latch
Orient to Top
of Canister
6. Use a clean, damp cloth and wipe the interior of
the air cleaner canister clean. Use special care
to clean both the inside and outside surfaces
of the outlet tube.
IMPORTANT: Any dust left on the inside of the
outlet tube will go into the engine and cause
wear.
Vacuator™
Valve
Cover Latch
7. Check the outside surface of the outlet tube for
smoothness and cleanness (this is the sealing
surface).
Proper Orientation of Air Cleaner Cover
8. Insert and seat the filter element carefully into
the canister, applying pressure at the outer rim
of the filter; not at the flexible center. Make sure
the filter element is completely in place before
installing the cover.
10. Check the air intake hose for cuts, nicks, etc.,
and the hose clamps for tightness.
11. Reset the air restriction indicator (press button
on bottom).
IMPORTANT: DO NOT use the cover latches
to force the filter into the canister -- the cover
should fit on with no extra force.
Engine Cooling System
Radiator Screen and Cooling Fins
NOTE: DO NOT use petroleum based lubri-
cants on the sealing surface of the filter; use tal-
cum powder or dry silicone lubricants if required
for filter installation.
To prevent the engine from overheating and possi-
ble engine damage, clean grass clippings, chaff,
and dirt from the fine mesh radiator intake screen
daily. In certain mowing conditions (dry grass,
leaves, tree “cotton”, etc.), it may be necessary to
check and clean the screen several times during use
to prevent engine overheating.
Radialseal™
Canister
Filter Element
1. Lift to remove the screen. To clean the screen,
wash with soapy water or blow out with com-
pressed air.
2. Inspect the radiator cooling fins for material
lodged in this area which would restrict cooling
airflow. Use pressurized air or water to clean.
DO NOT use any tool, like a screwdriver or
knife, to clean material out of the fins as this
may damage the cooling fins. DO NOT use cold
water on a hot radiator.
Radial Sealing
Surface
Safety Filter
Air Filter Element Replacement
57
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Maintenance Instructions
CLEANING
NOTE: Directing pressurized air or water from
the fan side of the radiator outward is recom-
mended to dislodge material packed on the out-
side of the cooling fins. DO NOT use cold water
on a hot radiator.
Grass Buildup in Mower Housing
DANGER
Before raising or removing the mower
deck for cleaning, stop the engine, re-
move the ignition key, and disconnect the
electrical plug on the fuel shut-off sole-
noid.
WARNING
Radiator and engine parts can become ex-
tremely hot during operation. Wear gloves
and avoid touching hot parts while clean-
ing the radiator screen and cleaning de-
bris away from the engine and cooling
system.
1. Raise the deck lock lever handle on each side
of the carrier frame and pull out to release car-
rier frame for tilting action.
2. Using the carrier frame lift handle, raise deck to
the TILT-UP position and insert the deck hook
into the tilt-up latch on the tractor body.
Flushing Radiator and Changing Coolant
Change engine coolant every year. Drain the cool-
ant from the engine and radiator:
Tilt-Up Lift Handle
Tilt-Up Latch
1. Remove the radiator cap.
2. Open the drain cocks on the engine block and
radiator (see the Kubota Owner’s Manual for lo-
cation of the drain cocks). Also, drain the cool-
ant recovery tank.
Tilt-Up Latch
3. If there is any indication of deposits or scaling
inside the radiator, use a commercial scale re-
mover and flush the cooling system thor-
oughly before adding fresh coolant.
Tilt-Up Hook
on Deck
Deck Lock Lever
Deck Secured in TILT-UP Position
DANGER
Use a pre-mixed 50/50 solution of antifreeze (ethyl-
ene glycol) and distilled water to refill the cooling
system.
IMPORTANT: The solution of antifreeze and water
must be thoroughly pre-mixed before putting it in the
engine. Adding pure antifreeze into the radiator may
cause damage to the engine from overheating.
Do not operate the mower with deck in tilt-
up position. Do not move the tractor with
the deck in the tilt-up position.
IMPORTANT: Maintain proper coolant level in the
radiator and coolant recovery tank. The coolant lev-
el should be maintained between FULL and LOW
marks on the coolant recovery tank. Recheck the
coolant level after the first time the engine has been
operated after filling the coolant system (it would be
normal to add a little coolant after initial operation).
3. Clean grass buildup underneath the deck using
a pressure washer (and scraper if required).
NOTE: While some degree of material buildup
in the mower deck housing can be tolerated, a
point is finally reached where cutting quality
deteriorates and clogging begins to occur
because of too much buildup on the baffling and
housing.
58
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Maintenance Instructions
CLEANING
4. Lower the deck to the normal operating position
and re-engage the deck lock levers.
2. Use a pressure washer or water spray, and di-
rect the spray inside the blower housing against
the blower blades. Water pressure will cause
the blower wheel to begin to spin and the com-
bination of spinning action and water will effec-
tively wash the inside of the housing. Spray
may be directed against the blower blades ver-
tically and horizontally to cause rotation in both
directions for thorough washing action. Wash
blower until the blower wheel spins freely in
both directions.
CAUTION
Do not operate machine with deck tilt-up
pivot joint unlocked.
GHS Blower
3. Reinstall the GHS blower drive belt by reversing
the removal procedure.
Normally, the GHS blower operates with no mainte-
nance or cleaning. However, when mowing grass
that is dirty and damp (especially springtime mow-
ing), a deposit of dirt may accumulate inside the
blower housing, causing wear and binding of the
blower wheel. When operating in these conditions,
inspect the blower frequently for dirt buildup.
Blower
Pulley
Blower
Drive Pulley
NOTE: A visual clue of binding of the blower wheel
is the blower blade tips are polished from rubbing
on dirt.
When a dirt deposit is found, use a high pressure
washer or water spray to clean the inside of the
housing as follows:
GHS Blower
Drive Belt
Belt Tightener
Idler Pulley
DANGER
Before attempting to wash the blower,
stop the engine, remove the ignition key,
and electrical plug on the fuel shut-off so-
lenoid.
Collapse Blower Belt Tightener
to Remove GHS Blower Drive Belt
GHS Exhaust Screen
Refer to Cleaning the GHS Exhaust Screen in
Operating Instructions.
1. Remove the GHS blower drive belt tension by
depressing the idler pulley on the tightener arm.
Roll the belt off the blower pulley. The belt
should be clear of the blower pulley, allowing
free movement of the blower wheel.
Hydrostatic Transmission Cooling Fins
Keeping the cooling fins on the hydrostatic transmis-
sions clean and free of obstruction is essential to
avoid overheating the transmission fluid and short-
ening transmission life. The cooling fins should be
checkedevery100hours;and cleaned if necessary.
IMPORTANT: With the belt removed, the blow-
er wheel must spin freely. Any binding or drag-
ging of the wheel is an indication of dirt
buildup. This buildup must be cleaned to
avoid abrasive wear of the blower blades, ex-
cessive power loss and eventual loss of blower
performance (clogging).
To clean the fins, use compressed air and/or a
pressure washer. The cooling fins extend all the
way around the housing -- the fins underneath need
to be clean as well as the more visible fins above.
Also, pay close attention to the area under the drive
pulley.
59
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CLEANING/
CHECKING/SERVICING
Maintenance Instructions
IMPORTANT: In case an oil leak develops on the
input shaft, the cooling fan blowing dusty air and oil
on the transmission will quickly pack the cooling
fins with oily dirt. If this condition occurs, replace
the seal immediately to avoid overheating and dam-
aging the transmission. The input shaft assembly
and seal are easily replaced without removing the
transmission from the machine.
Engine Cooling System
Coolant Level
WARNING
NEVER remove the radiator pressure cap
when the engine is hot — hot water could
spray and cause a burn if the cap is taken
off too soon.
An additional procedure in maintaining transmission
cooling is to inspect the cooling fans. Replace the
fan(s) if blades are missing or damaged.
Check the coolant level in the coolant recovery tank
and maintain the coolant level between the FULL
and LOW marks on the recovery tank. When the
engine is cold, the coolant level should be at or
slightly above the LOW mark on the recovery tank.
If the coolant level is low, remove the radiator cap
and fill to the overflow port level and then fill the re-
covery tank above the LOW mark. Use a pre-mixed
50/50 solution of antifreeze (ethylene glycol) and
distilled water to fill the cooling system.
Cooling Fan
Cooling Fins
IMPORTANT: The coolant solution of antifreeze
and distilled water must be thoroughly pre-mixed be-
fore putting it in the engine (adding pure antifreeze
into the radiator may cause damage to the engine by
causing overheating).
Fan Belt Tension
Check and adjust the fan belt tension to avoid en-
gine overheating and insufficient battery charg-
ing. Push on the belt in the middle of the span
between the alternator and crankshaft. If properly
tensioned, it should deflect about 0.4 in. (10 mm).
Also check the belt for cracks or deterioration.
Hydrostatic Transmission Cooling Fins
CHECKING/SERVICING
Fan Belt
DANGER
To prevent accidental starting of the en-
gine when servicing or adjusting the ma-
chine, remove the key from the ignition
switch and disconnect the electric plug on
the fuel shut-off solenoid.
0.4 in. (10 mm)
Deflection
Fan Belt Tension
60
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Maintenance Instructions
CHECKING/SERVICING
Security of Air Filtration Components
Cleaning the Terminals
NOTE: The following inspection is only an exter-
nal inspection and should be done without “dis-
turbing” the filtration components.
If battery terminals are corroded, remove battery
from the mower. Using a wire brush, remove corro-
sion with a solution of one part baking soda and
four parts water. Rinse with clean water. Coat the
terminals with petroleum jelly or terminal protector
spray to retard further corrosion.
On a daily basis, visually inspect the external condi-
tion of the complete air cleaner system. The follow-
ing items should be inspected:
Charging the Battery
1. Check the Donaldson Radialseal™ air cleaner
canister for damage. Make sure the cover is in
place and the cover latches are secure - do not
run the engine without the air cleaner cover in
place and secure.
Check the battery charge by measuring the specific
gravity of electrolyte; if specific gravity is less than
1.225, the battery will need to be charged as follows:
1. Charge the battery at 15 amps for 10 minutes.
DO NOT exceed 20 amps maximum recom-
mended charging rate. Charge until specific
gravity is at least 1.250. Total charging time
should not exceed one (1) hour.
2. Inspect the air intake hose for cracks, nicks,
cuts, etc., and check the hose clamps for tight-
ness.
Battery
2. After charging the battery, use drinking water to
adjust the electrolyte level to the bottom of the
vent wells [1/4 to 1/2 in. (6 to 13 mm) above the
plates].
NOTE: For initial battery service during setup, re-
fer to Battery Service in Assembly Instructions.
IMPORTANT: Make sure battery is securely mount-
ed in the frame. A loose battery may cause damage
to the case resulting in acid leakage and severe dam-
age to the machine. A hazard may be created by
damage to critical working parts and safety systems.
DANGER
BATTERIES PRODUCE EXPLOSIVE
GASES
Electrolyte Level
• Charge the battery in a well-ventilated
area, so that gases produced while charg-
ing can dissipate.
The battery electrolyte level should be checked af-
ter every 25 hours of operation. To check electro-
lyte level:
• Keep sparks, flames, and smoking ma-
terials away from the battery at all times.
1. Remove battery cell filler caps.
• Make sure the battery cap vents are open
2. Check the electrolyte level. If the level is below
the bottom of the vent well, fill with drinking wa-
ter to the bottom of the vent wells [1/4 to 1/2 in.
(6 to 13 mm) above the plates].
(check manifold vent on each cap).
• Make sure the battery charger is un-
plugged before connecting or discon-
necting cables to the battery.
3. Replace filler caps.
IMPORTANT: DO NOT overfill the battery.
Electrolyte will overflow through the vented caps
onto parts of the machine and WILL result in se-
vere corrosion.
Tire Pressure
Inflate tires to pressures shown below:
Deck Caster Wheel = 20 PSI (137 kPa)
Drive = 15 PSI (103 kPa)
Rear = 20 PSI (137 kPa)
61
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Maintenance Instructions
CHECKING/SERVICING
Sharpen Mower Blades
4. If the blade cutting edge is dull or nicked, it
should be sharpened. Remove blades for
sharpening by grasping the end of the blade us-
ing a rag or a thick, padded glove, while loosen-
ing and removing the nut, lock washer, and flat
washer that mounts the blade.
Check mower blade(s) for straightness, sharp-
ness, condition of the cutting edge, and balance
every 10 hours of operation (or more often when
mowing abrasive type grass or operating on sandy
soils). Replace blades if worn, bent, cracked, or
otherwise damaged (refer to REPLACING/RE-
PAIRINGtheMowerBladesinthissection). Usethe
following procedure to check and sharpen blades:
5. Grind cutting edge at the same bevel as the
original. Sharpen only the top of the cutting
edge to maintain sharpness.
NOTE: Keep blades sharp - cutting with dull
blades not only yields a poor mowing job but
slows the cutting speed of the mower and caus-
es extra wear on the engine and blade drive by
pulling hard.
NOTE: Blades can be sharpened with an elec-
tric blade sharpener, conventional electric grind-
er, or a hand file.
CAUTION
1. Stop the engine, remove ignition key, and dis-
connect the electrical plug on the fuel shut-off
solenoid before raising the mower deck to ser-
vice blades.
ALWAYS wear eye protection and gloves
when sharpening a blade.
2. Raise the deck and secure it in the TILT-UP po-
sition. Refer to CLEANING the Grass Buildup
in Mower Housing in this section for deck rais-
ing instructions.
Intersection
Sharpen at
Original 30° Angle
Wear Area
DANGER
Wing
Tip
30°
NEVER operate cutter blades with the
deck in the raised position.
Do Not Grind or
Sharpen on Underside
3. Check the blades for straightness by marking
the blade tip position inside the deck housing,
and then rotating the opposite end of the blade
to the same position and comparing. If the dif-
ference in blade tip track is more than 1/8 in.
(3 mm), the blade is bent and should be re-
placed.
Mower Blade Profile For Sharpening
6. Check blade balance by positioning the blade
horizontally on a blade balancer or use a nail
or shaft through the center hole. If either end of
the blade rotates downward, grind (remove)
metal on that end until the blade will
balance. The blade is properly balanced when
neither end drops. Balance of a blade is gener-
ally maintained by removing an equal amount of
material from each end of the blade when
sharpening.
WARNING
DO NOT try to straighten a blade that is
bent. NEVER weld a broken or cracked
blade. ALWAYS replace with a new blade
to assure safety.
62
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Maintenance Instructions
CHECKING/SERVICING
Fuel Lines and Clamps
Every year, inspect the fuel supply line from the tank
to engine for deterioration or damage. Also, inspect
the fuel line clamps for tightness. Good preventive
maintenance calls for complete replacement of fuel
lines and clamps every two (2) years.
NOTE: This procedure is of special importance for
the diesel engine due to poor performance when air
is injected with the fuel.
Blade Balancer
Radiator Hoses and Clamps
Inspect the radiator hoses every 200 hours for de-
terioration or damage. Also check the tightness of
the hose clamps. Good preventive maintenance
calls for complete replacement of the radiator hoses
and clamps every two (2) years.
Blade Balanced on Magnetic
Wall-Mounted Balancer
7. Mount the blade with wing tips pointing up into
the housing. Reinstall the blade, washer, lock
washer, and nut. Tighten the nut to 60 ft-lb
(81.3 N·m).
Blade Brake Action
NOTE: When reinstalling blades on GHS models,
remember, the blades turn toward each other
(counter-rotate) and the RH and LH blade cannot be
switched. Check for proper blade rotation before in-
stalling blades on the deck. Refer to Blade Rota-
tion for GHS Mower Deck illustration shown in
Clogging Checklist in Operating Instructions for
correct blade rotation.
WARNING
It is important to check and maintain blade
brake action for safe operation of the ma-
chine.
Check the function of the cutter blade brake (and
blower brake on GHS models) by engaging the
blade clutch (PTO), operating the engine at full throt-
tle, then disengaging the clutch and measuring how
quickly the blades stop. Watch the rotation of the
blade drive shaft and blower pulley as a visual indi-
cation that movement has stopped. If the brake is
working properly, all rotation will stop five (5)
seconds after disengagement of the clutch. If the
brake system malfunctions - blades do not stop in
five (5) seconds - adjust or repair the brake before
operating the mower. Contact your Walker Dealer.
Drive Belts
Raise the body and inspect the condition of the five
(5) belts (4 belts on SD models) every 25 hours of
operation - engine PTO drive, jackshaft drive, hydro-
static ground drive, GHS blower drive, and engine
fan belt. If the belts show signs of cracking or de-
teriorating, the belts should be replaced. Refer to
REPLACING/REPAIRING the Drive Belts in this
section.
Mower Deck Gearbox Oil Seals
The mower deck gearbox seals should be inspected
every 25 hours for evidence of oil leaking; particu-
larly the lower oil seal on the blade drive gearbox.
This seal is protected by the trash guard on the blade
hubandsealprotectorplateonthehousing, butisstill
vulnerable to seal damage due to operating in an ad-
verse environment. The mower blade must be re-
moved for inspection of the seal, so it is
recommended to inspect the gearbox seals when
blades are removed for sharpening. If an oil leak
isnoted,thesealshouldbereplacedandthegearbox
assembly relubricated. Refer to LUBRICATION for
Mower Deck Gearbox Lubrication in this section.
63
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Maintenance Instructions
REPLACING/REPAIRING
REPLACING/REPAIRING
Drive Belts
There are five (5) individual belts on GHS models
or four (4) belts on SD models:
DANGER
• Engine PTO Drive Belt (3 Groove Power Band)
• Jackshaft Drive Belt
To prevent accidental starting of the en-
gine when replacing parts or repairing the
machine, remove the key from the ignition
switch and disconnect the electrical plug
on the fuel shut-off solenoid.
• GHS Blower Drive Belt (GHS Model Only)
• Hydrostatic Ground Drive Belt
• Engine Fan Belt
IMPORTANT: ALWAYS use genuine factory re-
placement parts. Substitute parts CAN result in
product malfunction and possible injury to the oper-
ator and/or others.
The belts may be removed and replaced using the
procedures described on the following pages.
Jackshaft
Drive Belt
Engine
PTO Belt
Engine
Fan Belt
Hydrostatic Ground
Drive Belt
GHS Blower Belt
(GHS Model Only)
Belt Locations
64
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Maintenance Instructions
REPLACING/REPAIRING
Engine PTO Drive Belt (3 Groove Power Band)
1. To remove the engine PTO drive belt:
c. Remove the PTO drive belt by “walking”
the belt off of the engine and PTO pulleys
one groove at a time until the belt is com-
pletely removed.
a. Remove the jackshaft drive belt from its
idler pulley (by pushing down on cold start
lever) and let the belt drop down out of the
way.
2. Install the PTO drive belt by reversing the re-
moval procedure. Check and make the
following adjustments:
NOTE: Step (a) is not essential to removing
the PTO belt, but it makes more room to work
with the PTO belt.
a. Adjust clutch disengagement (brake band
adjustment) and check brake action.
b. Loosen the brake band adjustment nut to
allow the clutch idler pulley to drop down
against the frame. This provides maxi-
mum looseness of the belt to assist
removal.
b. Adjust clutch engagement for proper belt
tension.
Pull UP to Engage
Engine
Pulley
Engine
PTO Belt
Blade Clutch Lever
in the UP Position
Clutch
Linkage
Clutch Idler
Pulley
Brake
Band
PTO Belt
Tightener Arm
PTO Drive
Pulley
Engine PTO Drive Belt Removal
65
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Maintenance Instructions
REPLACING/REPAIRING
Jackshaft Drive Belt
b. Slide the idler arm release down to unlock
the idler arm from the spring lever. Then
pivot the arm up and away from the belt.
1. To remove the jackshaft drive belt:
a. Relax the belt by releasing spring tension
from the jackshaft drive idler arm using the
cold start lever.
c. Roll the belt off the jackshaft pulley and
remove.
Idler Arm
Release
Jackshaft
Drive Belt
Cold Start Lever
(Released)
Jackshaft
Pulley
Spring Tension
(Released)
Ground Drive
Idler Pulley (Disengaged)
Engine Pulley
Jackshaft Drive Belt (Disengaged)
2. Reverse the removal procedure to replace the
jackshaft drive belt.
Idler Arm
Release
Jackshaft
Drive Belt
Cold Start Lever
(Engaged)
Jackshaft
Pulley
Spring Tension
(Engaged)
Ground Drive
Idler Pulley (Engaged)
Engine Pulley
Jackshaft Drive Belt (Engaged)
66
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Maintenance Instructions
REPLACING/REPAIRING
GHS Blower Drive Belt
1. Remove the GHS blower drive belt tension by
depressing the idler pulley on the tightener arm.
Roll the belt off the blower pulley. The belt
should be clear of the blower pulley, allowing
free movement of the blower wheel.
Blower
Pulley
Blower Drive
Pulley
GHS Blower
Drive Belt
Belt Tightener
Idler Pulley
(Disengaged)
GHS Blower Drive Belt Assembly (Disengaged)
Blower Drive Belt Spring Removal
2. Reverse the procedure to install the GHS blow-
er drive belt and spring.
Idler Pulley
(Engaged)
GHS Blower Drive Belt Assembly (Engaged)
67
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Maintenance Instructions
REPLACING/REPAIRING
Hydrostatic Ground Drive Belt
b. Slide belt off pulleys, then release the
idler.
1. To remove the hydrostatic ground drive belt:
a. Raise the spring-loaded belt tightener arm
and idler pulley to relax belt.
Jackshaft
Spring
Belt Tightener Arm
Transmission
Drive Pulley
Idler Pulley
Hydrostatic
Ground Drive Belt
Hydrostatic Ground Drive Belt Assembly (Disengaged)
2. Reverse the procedure to install the hydrostatic
ground drive belt.
Belt Tightener Arm
Spring
Idler Pulley
Hydrostatic
Ground Drive Belt
Hydrostatic Ground Drive Belt Assembly (Engaged)
68
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Maintenance Instructions
REPLACING/REPAIRING
Engine Fan Belt
b. Pivot the alternator as shown to relax and
remove belt.
1. To remove the fan belt:
a. Loosen the alternator mounting pivot bolt
and the alternator bracket tensioner bolt.
Alternator
Bracket
Tensioner
Bolt
Engine
Fan Belt
Alternator
Water Pump
Pulley
Crankshaft
Pulley
Engine Fan Belt (Loose)
2. Reverse the procedure to install the belt. Ad-
just and check the belt tension by referring to
CHECKING/SERVICING the Fan Belt Tension
in this section.
Alternator
Bracket
Tensioner
Bolt
Engine
Fan Belt
Alternator
Water Pump
Pulley
Crankshaft
Pulley
Engine Fan Belt (Tight)
69
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Maintenance Instructions
REPLACING/REPAIRING
Fuel Filter
Blade Overload Shear Bolts
Model MDD has two (2) fuel filters. Replace both
the in-line filter and the Kubota filter element every
400 hours of operation.
NOTE: Shear bolts are not used on the DSD62
mower deck.
The cutting blade is keyed to the blade hub by two
(2) shear bolts (10-24 x 5/8 in. stainless steel ma-
chine screws). These bolts are designed to shear
and protect the blade drive gearbox from damage if
the blade encounters a shock load.
Kubota
Fuel Filter
In-Line
Filter
Cold Start Lever
(For Reference)
Cutting Blade
Shear Bolts
Fuel Filter Location
IMPORTANT: Replace fuel filters only in a
clean area where the fuel line and connections
will not be contaminated by dust and dirt.
Cutting Blade Shear Bolts
1. Close the fuel tank shut-off valve and the Kubota
fuel filter cock.
NOTE: Tightening the 5/8-18 blade mounting nut
to 60 ft-lb (81.3 N·m) is also important for proper
shock load protection. It is important to not over-
tighten the mounting nut since this defeats (over-
rides) the function of the shear bolts.
2. Remove and replace the in-line filter; expand
and slide clamps on either side of the filter away
from filter and pull fuel lines off filter.
If these bolts shear, remove the blade and install new
bolts. Refer to CHECKING/SERVICING in this sec-
tion for Sharpen Mower Bladeswhich describes the
blade removal and installation procedure.
3. Loosen the ring screw on the Kubota filter as-
sembly, remove the filter pot and filter element.
4. Clean the filter pot and reassemble the filter as-
sembly with a new filter element (use only a
Kubota replacement filter #15231-43560).
After reinstalling the blade, check blade timing by
moving blades through one (1) complete revolu-
tion. Make sure blade tips pass clear of each other.
If timing is incorrect, contact your Walker Dealer.
5. Open the fuel filter cock and fuel tank shut-off
valve.
70
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Maintenance Instructions
REPLACING/REPAIRING
PTO Shear Pin
Mower Blades
Mower blades are removed and remounted as de-
scribed in Sharpen Mower Blades instructions (re-
fer to CHECKING/SERVICING in this section).
During the course of sharpening and inspecting
mower blades, if there are any of the following
conditions of wear or damage, blades should be
replaced for reasons of safety and performance of
the machine:
The PTO drive shaft connection to the deck gearbox
has a shear pin to provide shock load protection to
the mower deck drive. This system provides prima-
ry shock protection in case of blade impact and will
normally shear before the individual shear bolts on
the blade hub.
When the PTO pin has sheared, use the following
procedure to replace it:
• An excessive amount of the flat section of the
blade has been ground away (removed) when the
blade is sharpened. Replace the blade when less
than a 3/4 in. (19 mm) flat section remains at the
blade tip.
1. Loosen the two bolts securing the PTO shaft
guard on the deck; lift the guard off. (Holes in
guard are slotted for easy removal.)
2. Rotate U-joint on shaft to align the shear pin
hole with the hole (and shear pin fragment) in
the shaft. Use a punch to drive the remaining
portion of the old shear pin out.
• Examine ends of the blade carefully, especially
the intersection where the flat section of the blade
turns up to form the “wing tip” (refer to CHECKING/
SERVICING for Mower Blade Profile for Sharpen-
ing illustration in Sharpen Mower Blades instruc-
tions). Since sand and abrasive material can wear
metal away in this area, the blade should be re-
placed when metal thickness has worn to 1/16 in.
(1.6 mm) or less.
3. Install new shear pin and secure with cotter pin.
Shear Pin
DANGER
Split Spring Pin
When blades are operated over sandy
soil, and if blades are allowed to wear, a
“slot” may be worn into the wing tip of
blade. Eventually a piece of the blade may
break off creating a serious potential for
injury or damage.
U-Joint
Tube Assembly
U-Joint
Shaft Assembly
• Check the blades for straightness by marking
blade tip position inside the deck housing and then
rotating the opposite end of the blade to the same
position and comparing. If the difference in blade tip
track is more than 1/8 in. (3 mm), the blade is bent
and should be replaced.
Cotter Pin
PTO Shear Pin
IMPORTANT: Use only Walker P/N 8067-13
shear pins for replacement to provide proper
shock protection -- these pins are hardened to
shear under a specific amount of load.
• Inspect the blade surface, especially in formed ar-
eas, for cracks. Replace the blade if any cracks are
found.
4. Reinstall the PTO shaft guard.
WARNING
Before operating the deck, inspect the blade over-
load shear bolts and also check blade timing (on
gear driven decks) by moving blades through one
(1) complete revolution. Make sure blade tips
pass clear of each other. If timing is incorrect, con-
tact your Walker Dealer.
DO NOT try to straighten a blade that is
bent. NEVER weld a broken or cracked
blade. ALWAYS replace with a new blade
to assure safety.
71
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REPLACING/REPAIRING/
ADJUSTMENTS
Maintenance Instructions
Reinstall the blades following procedure from
SharpenMowerBladesinstructionsin CHECKING/
SERVICING in this section. If blades are replaced,
always use Walker original equipment blades to
ensure safety and optimum performance. The
quality and performance of replacement blades
offered by other manufacturers cannot be
guaranteed, they could be dangerous.
Tilt-Up Deck Adjustable Stop
When the carrier frame hinge joint is properly adjust-
ed, the deck lock levers should move in and out of
the engaged and disengaged positions freely. All
four hitch pins used for height adjustment should sit
flush on the washers above the deck pin bushing.
On a level surface, if any pin is sticking up (likely the
front pins), tighten the opposite side or loosen the ex-
isting side to lower the pin. Adjustments are made by
loosening the jam nut and tightening or loosening the
set screws on the Deck Mount Pivot Brackets. Re-
tighten the jam nut when the adjustment is complete.
CAUTION
ALWAYS use genuine factory replacement
parts. Substitute parts CAN result in prod-
uct malfunction and possible injury to the
operator.
Jam Nut
ADJUSTMENTS
Steering Levers
An adjustment range of approximately 3 inches is
available on the steering levers - the levers can be
adjusted forward or aft depending on the arm length
of the operator. The levers can be adjusted by loos-
ening the locknut at the pivot point and the locknut
holding the lever in position in the adjustment slide.
Adjust levers into most comfortable position and
tighten both locknuts.
Set Screw
Tilt-Up Deck Adjustable Stop
GHS Signal Horn Adjustment
(When Horn Sounds at Wrong Time)
DANGER
PINCH POINT - SPRING LOADED DOOR
Adjustment
When lowering the door on the GHS
catcher, depress the safety latch on the
side of the catcher. BE VERY CAREFUL to
keep hands, fingers, etc. out of the hing-
ing mechanism and away from the door
frame as the door closes. The springs that
hold the door closed during operation are
very powerful, and the door can slam shut
with considerable force.
Slide
Locknut
(Position)
Locknut
(Pivot Point)
The vertical position of the Grass-Pak® switch is crit-
ical to make sure the catcher box does not overfill
causing the delivery chute to clog. The vertical po-
sition can be adjusted by bending the mounting
bracket for the Grass-Pak® switch.
Steering Lever Adjustment
72
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Maintenance Instructions
ADJUSTMENTS
1. Position the discharge chute so that it is point-
ing straight back.
3. If adjustment is required, hold the Grass-Pak®
switch mount bracket firmly, grasp the switch
and bracket and bend it down. Adjustments
should be done in very small increments check-
ing the measurement each time until the recom-
mended measurement is achieved. This
measurement is applicable to all catcher box
sizes.
a. Turn the ignition switch ON and move the
blade clutch to the ENGAGED position
(engine not running).
b. Open the catcher back door and monitor
the spout position (as it oscillates) and
move the blade clutch to the DISEN-
GAGED position and turn the ignition
switch to the OFF position.
NOTE: It will not be possible to adjust the switch to
give a signal at the precise instant the catcher is full
for a wide variety of mowing conditions. For exam-
ple, wet heavy grass will fill the catcher differently
than dry fluffy grass, causing the signal to come on
a little sooner or later than usual. Primarily, the
switch should be adjusted to give the “full” signal
with a little advance warning before overfilling
and clogging of the grass delivery chute begins (re-
gardless of mowing conditions).
WARNING
DO NOT test the Grass-Pak® switch with
the engine running. Projectiles CAN be
thrown out of the grass delivery spout and
CAN cause serious injury to bystanders or
property damage.
2. Measure from the exhaust screen (top of catch-
er) to the top of the Grass-Pak® switch actuator
vane, as shown. The proper measurement
should be between 4 and 4-1/2 inches (10.16
and 11.43 cm).
Exhaust
Screen
4 to 4-1/2 in.
Bend
Point
Adjusting the Grass-Pak® Switch
(Side view of Catcher Box)
73
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74
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LIMITED WARRANTY
FOR
WALKER
COMMERCIAL RIDER MOWER
1.
WHAT THIS WARRANTY COVERS, AND FOR HOW LONG:
Walker Manufacturing company will, at its option, repair or replace, without charge, any part covered by this warranty which
is found to be defective in material and/or workmanship within one (1) year* after date of sale to the original retail pur-
chaser unless the product is used for rental purposes, in which case this warranty is limited to ninety (90) days. At
Walker’s request, customer will make the defective part available for inspection by Walker and/or return the defective part
to Walker, transportation charges prepaid. All parts and components of the Walker Mower are covered by this warranty
except the following components which are warranted separately by their respective manufacturers:
Kohler Engine
Kubota Engine
Kawasaki Engine
Eaton Hydraulic Transmission
Peerless Gearboxes
Battery
Tires
The available warranties covering these items are furnished with each mower. Walker does not assume any warranty obli-
gation, liability or modification for these items, which are covered exclusively by the stated warranty of the respective man-
ufacturers noted above.
* An extended three (3) year warranty is offered on the Walker P/N 6200-9 Gear Axle Assembly.
2.
WHAT THIS WARRANTY DOES NOT COVER:
A.
B.
This warranty does not cover defects caused by depreciation or damage caused by normal wear, accidents, improper
maintenance, improper use or abuse of the product, alterations, or failure to follow the instructions contained in the
Owner’s Manual for operation and maintenance.
The customer shall pay any charges for making service calls and/or for transporting the mower to and from the place
where the inspection and/or warranty work is performed.
3.
4.
HOW TO OBTAIN SERVICE UNDER THIS WARRANTY:
Warranty service can be arranged by contacting the dealer where you purchased the mower or by contacting Walker Man-
ufacturing Company, 5925 East Harmony Road, Ft. Collins, CO 80528. Proof of the date of purchase may be required to
verify warranty coverage.
WARRANTY LIMITATION:
A.
THERE IS NO OTHER EXPRESS WARRANTY. ANY WARRANTY THAT MAY BE IMPLIED FROM THIS
PURCHASE INCLUDING MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IS HEREBY
LIMITED TO THE DURATION OF THIS WARRANTY AND TO THE EXTENT PERMITTED BY LAW ANY AND ALL
IMPLIED WARRANTIES ARE EXCLUDED. Some states do not allow limitations on how long an implied warranty
lasts, so the above limitations may not apply to you.
B.
WALKER WILL NOT BE LIABLE FOR ANY INCIDENTAL, CONSEQUENTIAL, OR SPECIAL DAMAGES AND/OR
EXPENSES IN CONNECTION WITH THE PURCHASE OR USE OF THE MOWER. Some states do not allow the
exclusion or limitation of incidental or consequential damages, so the above limitation(s) or exclusion(s) may not
apply to you.
C. Only the warranty expressed in this limited warranty shall apply and no dealer, distributor, or individual is authorized
to amend, modify, or extend this warranty in any way. Accordingly, additional statements such as dealer advertising
or presentations, whether oral or written, do not constitute warranties by Walker, and should not be relied upon.
D. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
75
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Vibration - Model MDD
Sound - Model MDD
Vibration Level
Sound Test
Vibration levels at the operators handles
were measured in the vertical, lateral, and
longitudinal directions using calibrated vibra-
tion test equipment.
Sound test conducted was in accordance
with 79/113/EEC and was performed on 28
January 98 under the conditions listed:
Lwa
105
0.8g
Tests were performed on 28 January 98
under the conditions listed:
General Condition:
Temperature:
Wind Speed:
Humidity:
Cloudy
LpA
32 (F)o 0 (C)o
< 5 mph (< 8 kmh)
58%
93
OPERATOR
General Condition:
Cloudy
Temperature:
Wind Speed:
Humidity:
32 (F)o 0 (C)o
< 5 mph (< 8 kmh)
58%
B a r o m e t r i c P r e s s u r e : 2 5 . 0 " H G ( 6 3 6 m m H g )
Barometric Pressure: 25.0" HG (636 mm Hg)
WALKER MFG. CO. • 5925 E. HARMONY ROAD, FORT COLLINS, CO 80528 • (970) 221-5614
FORM NO. 021505
PRINTED IN USA
©2005 WALKER MFG. CO
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