OWNER’S MANUAL
Safety, Assembly, Operating, and Maintenance Instructions
and ILLUSTRATED PARTS MANUAL
Model MB (18 HP)
™
Please Read and Save These Instructions
For Safety, Read All Safety and Operation
Instructions Prior to Operating Machine
Effective Date: 10-01-04
P/N 4000-1
Price $5.00
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Table of Contents
ENGAGING THE MOWER________________ 30
STOPPING THE MACHINE _______________ 31
ADJUSTING CUTTING HEIGHT ___________ 31
TRANSAXLE LOCKOUTS________________ 32
RECOMMENDATIONS FOR MOWING ______ 32
RECOMMENDATIONS FOR TILT-UP DECK
Owner’s Manual
General Information ________________ 3
HIGHLIGHTED INFORMATION _____________ 3
GLOSSARY ____________________________ 3
IDENTIFYING NUMBER LOCATIONS________ 3
ENGINE SERIAL NUMBER LOCATION ______ 4
SERVICING OF ENGINE AND
OPERATION/TRANSPORT _______________ 33
Maintenance Instructions__________ 34
DRIVETRAIN COMPONENTS ______________ 4
MAINTENANCE SCHEDULE CHART_______ 34
IMPORTANT TIPS FOR CARE OF THE
Specifications _______________________ 5
Component Identification___________ 8
Safety Instructions _________________ 11
BRIGGS & STRATTON ENGINE___________ 35
Fuel System _________________________ 35
Starting_____________________________ 35
Cooling System ______________________ 35
Air Cleaner __________________________ 35
Oil _________________________________ 35
LUBRICATION _________________________ 36
Engine Oil___________________________ 36
Engine Break-In Oil __________________ 36
Checking Engine Crankcase Oil Level ___ 36
Changing Engine Crankcase Oil/Oil Filter 36
Grease Fitting and Oil Point Lubrication__ 37
Mower Deck Gearbox Lubrication _______ 40
Transaxle Lubrication _________________ 40
CLEANING ____________________________ 41
Engine Air Cooling System ____________ 41
Air Cleaner System __________________ 41
Grass Buildup in Mower Housing _______ 42
Transaxle Cooling Fins________________ 43
CHECKING/SERVICING _________________ 43
Security of Air Cleaner System _________ 43
Battery _____________________________ 43
Cleaning the Terminals _______________ 43
Charging the Battery _________________ 43
Tire Pressure ________________________ 44
Sharpen Mower Blades________________ 44
Drive Belts __________________________ 45
Mower Deck Gearbox Oil Seals _________ 45
Spark Plugs _________________________ 45
Breaker Points _______________________ 45
Fuel Lines and Clamps ________________ 45
Blade Brake Action ___________________ 46
REPLACING/REPAIRING ________________ 46
Drive Belts __________________________ 46
Engine/PTO Belt ____________________ 47
Ground Drive Belt ___________________ 48
Fuel Filter ___________________________ 49
Blade Overload Shear Bolts ____________ 49
PTO Shear Pin _______________________ 49
Mower Blades _______________________ 50
BEFORE OPERATING___________________ 11
OPERATING___________________________ 12
MAINTENANCE ________________________ 13
SAFETY, CONTROL, AND
INSTRUCTION DECALS _________________ 15
Assembly Instructions _____________ 17
SETUP INSTRUCTIONS _________________ 17
Battery Service_______________________ 17
Mower Deck Assembly ________________ 17
Deck Caster Wheels Installation ________ 17
Deck Discharge Shield Installation ______ 17
PTO Shaft Guard Installation __________ 18
Tilt-Up Roller Wheel Installation ________ 18
Mower Deck Installation on Tractor ______ 18
Deck Installation ____________________ 18
Deck Leveling ______________________ 20
PREOPERATING CHECKLIST ____________ 21
Operating Instructions_____________ 24
CONTROL IDENTIFICATION,
LOCATION, AND FUNCTION _____________ 24
Ignition Switch _______________________ 24
Engine Choke ________________________ 25
Engine Throttle_______________________ 25
Forward Speed Control (FSC)___________ 25
Steering Levers ______________________ 25
PTO Switch __________________________ 25
Parking Brake________________________ 26
Transaxle Lockout Rods _______________ 26
Hourmeter___________________________ 26
STARTING THE ENGINE_________________ 28
ADJUSTING GROUND
SPEED AND STEERING _________________ 28
1
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Table of Contents
ADJUSTMENTS ________________________ 51
Steering Levers ______________________ 51
Tilt-Up Deck Adjustable Stop ___________ 51
ELECTRICAL SYSTEM __________________ 51
Illustrated Parts Manual
TRACTOR DECALS_____________________ 52
BODY / CHASSIS ASSEMBLY ____________ 54
MAIN COMPONENT
POWER TRANSMISSION ________________ 56
ENGINE GROUP _______________________ 58
HYDROSTATIC GROUND
DRIVE ASSEMBLIES____________________ 60
STEERING CONTROL ASSEMBLIES_______ 62
ELECTRICAL ASSEMBLY________________ 64
WIRING SCHEMATIC____________________ 66
Operator’s Notes ___________________ 67
Maintenance And Service
Record Sheet _______________________ 68
Warranty ___________________________ 69
2
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General Information
HIGHLIGHTED INFORMATION
•
•
STEERING LEVERS steer the tractor by con-
trolling the two transaxles.
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.
TRACTOR is the prime mover, including the en-
gine, drive train, operator seat, and controls to
operate the mower.
•
TRANSAXLE LOCKOUT RODS release the
transaxles to permit freewheeling the tractor.
IDENTIFYING NUMBER LOCATIONS
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.
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.
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:
Tractor Model No. _______________________
Tractor Serial No. _______________________
•
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.
Deck Serial No.
_______________________
Engine Model No. _______________________
Engine Serial No. _______________________
Date of Purchase _______________________
•
FORWARD SPEED CONTROL (FSC) controls
the maximum forward speed of the tractor;
functioning as a cruise control.
•
•
GROUND DRIVE refers to the dual transaxles
which drive the main wheels.
Fill In By Purchaser
TRANSAXLE 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.
•
•
POWER TAKE-OFF (PTO) transmits engine
power to run the cutter blades.
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.
3
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General Information
Serial Number
Serial Number
Engine Serial Number Location
Tractor Serial Number Location
SERVICING OF ENGINE AND DRIVETRAIN
COMPONENTS
The detailed servicing and repair of the engine, tran-
saxle 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 manufacturer. Any unauthorized
work done on these components during the war-
ranty period may void the warranty. If you have any
difficultyfindinganauthorizedoutletorobtainingwar-
rantyservice,pleasecontactourServiceDepartment
for assistance:
Serial Number
Walker Manufacturing Company
5925 E. Harmony Road
Fort Collins, CO 80528
1-970-221-5614
Mower Deck Serial Number Location
ENGINE SERIAL NUMBER LOCATION
The Briggs & Stratton engine model, type, and code
numbers are located on the left hand of the engine
shroud. For the mower model covered by this man-
ual, contact a Briggs & Stratton servicing dealer.
Service manuals are available for each of these
components from their respective manufacturers as
follows:
Briggs & Stratton
Engine
Briggs & Stratton
800-233-3723
(24-hour hotline in
USA & Canada)
Transaxle
Hydro-Gear
Sullivan, IL
Gearboxes (Deck)
Tecumseh Products Co.
900 North Street
Grafton, Wl 53024
4
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Specifications
MODEL
MB
ENGINE
Manufacturer/Model
Displacement
Briggs and Stratton Vanguard, 2 Cyl. OHV (Air-Cooled)
34.7 cu. in. (570 cc)
18.0
HP (@ 3600 RPM)
Max. RPM (No Load)
Governed RPM
3600 ± 100
3600 ± 100
Max. Torque [ft-lb (N m) @ RPM]
Idle RPM
29.5 (40.5) @ 2400
1750
Spark Plug Type
Champion RC14YC
.030 in. (.75 mm)
1.5 qts (1.4 liters)
Spark Plug Gap
Crankcase Capacity
Crankcase Lubricant
SF/SG/SH/SJ or Higher Grade Oil Only with 30W Viscosity
Above 40° F (4° C)
Fuel Tank Capacity
Fuel
3 Gallons (11.35 liters)
Automotive Grade Unleaded Gasoline (85 Octane)
Air Cooled
Cooling System
ELECTRICAL SYSTEM
Battery
12 Volt, 220 CCA (Interstate PC12/80)
Flywheel Alternator
Charging System
Charging Output
System Polarity
Ignition
16 Amp DC (Regulated)
Negative Ground
Magnetron® Electronic
Starter
12 Volt Electric Key and Solenoid Operated
Ignition LockoutbySeatSwitch, TransmissionNeutraland Blade Clutch
Interlock Switch
TRANSMISSION
Manufacturer/Model
Steering
Dual, Independent Hydro-Gear Integrated Transaxles
Hand Lever Control / Individual Wheel
Forward Speed Control
Precision Friction Lock Lever, Cruise Control, with Neutral-Park
Position
Service Brake
Parking Brake
Neutral
Dynamic Braking through Hydrostatic Transmission
Mechanical Cog Lock in Transmission Gear
Transmission Release by Manual Dump Valve
Direct Drive Axle from Transaxle
Final Drive
5
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Specifications
MODEL
MB
TRANSMISSION (continued)
Transmission Fluid
Factory Service
20W50 Multi-Viscosity Motor Oil (Minimum SL Grade Oil)
79 fl oz (2336 ml)
Transmission Fluid Capacity
Transmission Cooling
Ground Travel Speed
Cooling Fan Mounted on Drive Pulley
Forward m.p.h. (km/h)
Reverse m.p.h. (km/h)
0-8 (0-13) Infinitely Variable
0-8 (0-13) Infinitely Variable
BLADE DRIVE
PTO Shaft
Sliding Spline Shaft with Two (2) 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
12V Electrical (Electromagnetic Clutch and Brake) Switch
Operated [Stops Blades within Five (5) Seconds of
Disengagement]
Max. Blade Speed
[22 in. (56 cm) Blade] @ 3600
RPM Engine
2900 RPM
[16700 FPM (5090 m/min)]
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 8.50-10 (4-Ply)
Rear
13 x 6.50-6 (4-Ply)
TIRE PRESSURE
Deck Caster Wheel
20 PSI (137 kPa)
15 PSI (103 kPa)
Drive
Rear
20 PSI (137 kPa)
DIMENSIONS (Tractor and Mower)
Length
Width
36 in. (91 cm) SD Model
(with Deflector)
41-3/4 in. (106 cm)
47-3/4 in. (121 cm)
42 in. (107 cm) SD Model
(with Deflector)
48 in. (122 cm) SD Model
(with Deflector)
53-3/4 in. (137 cm)
61-3/4 in. (157 cm)
56 in. (142 cm) SD Model
(with Deflector)
6
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Specifications
MODEL
MB
DIMENSIONS (continued)
Height
39 in. (99 cm)
Wheel Base (Tractor)
Tread Width (Tractor)
38-1/2 in. (98 cm)
29-3/4 in. (76 cm)
MOWER DECK
Width of Cut
36-, 42-, 48-, or 56-in. (91, 107, 122 or 142 cm)
1 to 4 in. (3 to 10 cm)
Cutting Height
Height Adjustment
7 Positions - 1/2 in. (1 cm) Increment Hitch Pins Installed in
Multi-Position Deck Support
Blade Size
36 in. (91 cm) SD Model
20 in. (51 cm) Two (2) Clockwise-Rotating Blades with a 4 in.
(10 cm) Center Overlap
42 in. (107 cm) SD Model
48 in. (122 cm) SD Model
56 in. (142 cm) SD Model
Deck Suspension
22 in. (56 cm) Two (2) Clockwise-Rotating Blades with a 2 in.
(5 cm) Center Overlap
25 in. (64 cm) Two (2) Clockwise-Rotating Blades with a 2 in.
(5 cm) Center Overlap
20 in. (51 cm) Three (3) Clockwise-Rotating Blades with a 2 in.
(5 cm) Center Overlap
Torsion-Flex Frame with Caster Wheels and
Counterweight Springs
CURB WEIGHT (Approximate)
Tractor Only
564 lb (256 kg)
709 lb (322 kg)
744 lb (337 kg)
769 lb (349 kg)
SD Tractor and 36 in. SD Deck
SD Tractor and 42 in. SD Deck
SD Tractor and 48 in. SD Deck
DRIVE BELTS
Engine PTO
Walker P/N 4230
Walker P/N 4248
Ground Drive
SEAT
Contour-Molded, with Nylon Backed Vinyl Cover and Integral
Foam Cushion
FRAME/BODY CONSTRUCTION
Frame/Body
Deck
3/16 Plate Steel
11 Gauge Steel
NOTE: The manufacturer reserves the right to make changes in specifications shown herein at any time
without notice or obligation.
7
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Component Identification
NOTE: Control Identification
shown in Operating
Instructions section.
Tilt-Up Latch
Fuel Pickup Line
Counterweight Spring and
Protective Cover
Fuel Tank
and Cap
Deck Support
Deck Support
Pin and Height
Arm
Adjustment
Hitch Pins
Forward Speed
Control (FSC)
Friction
Tilt-Up
Deck Handle
Adjustment
Deck Support Arm
Deck Lift Handle
(Cutting Height Adjustment)
Tilt-Up
Hook
Footrests
Deck Discharge Shield
Deck
Caster Wheels
Footrests
Front View and Right Side View
8
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Component Identification
Oil Fill
Oil Dipstick
Muffler
Fuel Filter
Cylinder Head
Cooling Fins
Left Hand
Drive Wheel
Tailpipe
Electric Clutch
Tailwheel Fork
and Wheel
PTO Belt
Protective Cover
Left Hand
Transaxle
Rear View and Left Side View
9
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Component Identification
Steering Levers
Dampening Springs
LH Transmission
Control Arm
RH Transmission
Control Arm
RH Transaxle
E x p a n s i o n
R e s e r v o i r
LH Transaxle
E x p a n s io n
R e s e r v o i r
and Hose
and Hose
RH Transaxle
LH Transaxle
RH Transaxle
Lockout Rod
LH Transaxle
Lockout Rod
Parking Brake
Positive (+)
Battery Cable
Parking Brake
Linkage
Negative (-)
Battery Cable
Flexible PTO
Spider Coupling
Fuel Pump
Fuel Tank Cap
Fuel Filter
Air Cleaner Cover
Air Cleaner
Cover Latch
Oil Fill
Fuel Tank
Fuel Pickup Line
Oil Dipstick
Rubber Bumpers
(Body Support)
RH Tail Weight
LH Tail Weight
Muffler Heat Shield
Top View (Body Raised)
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 necessary
for the operator to use safe operating procedures at
all times. Failure to follow safety instructions
contained in this manual may result 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
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:
WARNING
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
2. Never allow children to operate rider mower.
Do not allow adults to operate without proper
instruction.
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.
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
machine.
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
attention.
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
impairment or loss of hearing. Operator hear-
ing protection is recommended. Wear a
suitable hearing protective device, such as ear-
muffs 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
machine.
3. For a beginning operator, learn to steer
(maneuver) the tractor with a slow engine
speed before attempting any mowing oper-
ation. 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 switch
is in the DISENGAGED position. Also, the
engine should stop if the operator lifts off the
seat with the PTO switch 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 the transmission drive belt breaks 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.
10. Handle gasoline with care. Gasoline is highly
flammable and its vapors are explosive:
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 controls
are in the OPERATING position).
d. Always fill the fuel tank outdoors using care.
Filltoaboutoneinchfromthetopofthetank.
Use a funnel or spout to prevent spilling.
7. Do not run the engine in a confined area
without adequate ventilation. Exhaust fumes
are hazardous and can be deadly.
e. Replace the machine fuelcapandcontainer
cap securely and clean up any spilled fuel
before starting the engine.
8. Do not carry passengers - maximum seating
11. Never attempt to make any adjustments
whiletheengineisrunning, exceptwherespe-
cifically instructed to do so.
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.
16. In case of a clogged or plugged mower deck:
a. Disengage the blade clutch (PTO) and turn
the engine off before leaving the seat.
b. LOOK tomakesure blade driveshaftmove-
ment has stopped before trying to unclog
the system.
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.
c. Disconnect the spark plug wires.
d. Never place hands under the deck use a
stick or similar tool to remove clogged ma-
terial.
11. Disengage the blade drive when transporting
the machine acrossdrives, sidewalks, etc. Never
raise the mower deck while blades are
rotating.
17. If the cutting blades strike a solid object or the
machine begins to vibrate abnormally,
immediately disengage the blade clutch
(PTO), stop the engine, and wait for all
moving parts to stop. To prevent accidental
starting, disconnect the spark plug wires.
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).
12. The maximum recommended side slope
operating angle is 20 degrees or 33% grade.
When operating the machine on a slope, reduce
speed and use caution to start, stop, and
maneuver. To prevent tipping or loss of control
of the machine, avoid sharp turns or sudden
changes in direction.
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.
18. 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.
NOTE: The electric clutch brake should nor-
mally stop drive line rotation within five (5) sec-
onds of disengaging the PTO clutch.
19. When leaving the machine unattended, dis-
engage the blade clutch (PTO), stop the
engine, and remove the key.
14. For side discharge mower decks, do not oper-
ate with the grass deflector chute removed.
Keep the deflector in the lowest possible
position.
MAINTENANCE
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 spark plug wires.
15. When using the tilt-up deck, observe the fol-
lowing recommendations:
2. To reduce fire hazards, keep the engine free of
a. Do not move tractor with deck in tilt-up po-
sition.
grass, leaves, excessive grease, and dirt.
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. Never tilt body forward with deck in tilt-up
position.
4. Perform only maintenance instructions de-
scribed in this manual. Unauthorized main-
tenance operations or machine modifications
may result in unsafe operating conditions.
13
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Safety Instructions
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.
11. Use care when charging the battery or per-
forming maintenance on the battery and
electrical system:
a. Make sure the battery charger is unplugged
before connecting or disconnecting cables
to the battery.
6. Always use the proper engine service
manual when working on the engine.
Unauthorized maintenance operations or
modifications to the engine may result in
unsafe operating conditions.
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.
7. Altering the equipment or engine in any manner
which adversely affects its operation, perfor-
mance, durability, or use will VOID the warranty
and may cause hazardous 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.
8. Never attempt to disconnect any safety devices
or defeat the purpose of these safety devices.
d. Disconnect both battery cables before un-
plugging any wiring connectors or making
repairs on the electrical system.
9. Do not change the engine governor settings or
overspeed the engine. The governor has been
factory-set for maximum-safe engine operating
speed.
IMPORTANT: Keep all applicable manuals
immediately accessible to anyone who may
operate or service this machine.
10. Use genuine factory replacement parts. Sub-
stitute parts may result in product malfunction
and possible injury to the operator and/or
others.
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 Section.
Each End of Mower Deck (5808)
SD Deck Discharge Shield (5848)
LH Fender (5802-2)
RH Fender (5802-1)
Rear Body,
Above Muffler (5805)
Deck Gearbox Cover (5807-3)
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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 Section.
Front Body Adjacent to
Upper Guard
(4107-1)
LH Steering Lever (7818)
Blade Clutch on Front Body
Adjacent to RH Steering Lever (6806)
Hydrostat Oil
Reservoir (4024-2)
Belt Routing (4107-4)
Deck Carrier Frame (8647)
Parking Brake (4406-8)
Deck Carrier Frame (5865)
Deck Carrier Frame (8653)
Center Body Behind Transaxles
(9804)
16
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Assembly Instructions
SETUP INSTRUCTIONS
Walker Mowers are shipped partially assembled to
our distribution network, and are typically assembled
by the selling dealer. For any additional assembly
besides the following, contact your Walker dealer.
Battery Service
The battery is a completely sealed, non serviceable
battery.
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.
Deck Caster Wheel Installation
Deck Discharge Shield Installation
(Side Discharge Models Only)
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.
Mower Deck Assembly
Deck Caster Wheels Installation
1. Remove the bolt, nut, axle spacer tube, and
spacer washers from each deck caster wheel
fork.
NOTE: Spacer washers are used only when
the optional semi-pneumatic deck wheels (8.25
x 2.75) are installed.
WARNING
DO NOT operate the machine without the
grass deflector chute attached and in the
lowest possible position.
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. 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.
Attach Shield
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.
Deck Discharge Shield Installation
17
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Assembly Instructions
PTO Shaft Guard Installation
Mower Deck Installation on Tractor
Deck Installation
Position the shaft guard as shown and mount with
two 1/4-20 x 1/2 in. bolts.
1. Lightly grease each deck support arm (2) on the
tractor. RefertoMowerDeckInstallationphoto
for location of deck support arm.
2. Engage the deck carrier frame tube sockets on
the tractor support arms (refer to PTO Shaft
Guard Installation photo for socket location).
Slide the deck onto the support arms approxi-
mately 3 in. (76 mm).
Carrier Frame
Tube Sockets
Attach
Guard
3. Align and connect the splined PTO shaft and
socket halves, as shown in PTO Shaft Connec-
tionphoto. ThePTOshafthasapilotendtoease
alignment of shaft; fit shaft end into socket and
rotate shaft until the splines line up as indicated
by arrows, then slide together.
PTO Shaft Guard Installation
Arrows on Shaft and Tube
(used to align when sliding together)
Tilt-Up Roller Wheel Installation
NOTE: A 2-1/2" diameter tilt-up roller wheel
(P/N 9772) is required for decks installed on the
Model MB tractor.
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.
PTO Connection
PTO Shaft Connection
4. Install the hitch pin through the hole on the end
of each support arm to lock the deck in place (re-
fer to Deck Counterweight Spring Installation
photo). Two (2) hitch pins are included in the
owner’s packet of materials.
Roller Wheels
Roller Wheel Installation
Deck Support
Arms
Mower Deck Installation
18
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Assembly Instructions
Spring Tension Adjustment Nut
Located Under Lower
Spring Hook (not visible)
Counterweight Springs
Clip Onto Body
With Body Tilted Up
Hitch Pins
Lock Deck On
Support Arms
Deck Counterweight Spring Installation
5. Raise mower body (instead of lifting the front of
deck) and clip the counterweight springs to the
receptacle on front of body. Lower the body to
tension the springs. (Refer to Deck Counter-
weight Spring Installation photo.)
6. With the counterweight springs connected, the
weight on the deck caster wheels should be 15
to 25 Ib (6.8 to 11.3 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 lo-
cated underneath the lower spring hook. Refer
to Deck Counterweight Spring Installation
photo.
19
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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
NOTE: The mower deck and support frame
are jig welded; within normal tolerances, very lit-
tle, if any, shimming should be required to level
the deck. Tire pressure will influence the level-
ness of the deck. Check the tire pressure as a
possible cause of the deck not being level.
The machine must be shut off during this
procedure.
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
20
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Assembly Instructions
PREOPERATING CHECKLIST
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,
someoftheseitemswillnotneedtobecheckedevery
day, buttheoperatorshouldbeawareofthecondition
of each.)
Body Rod
Body Rod
Body Rod in Stowed Position
CHECK BODY ROD IN STOWED POSITION
Check that body rod is secured in the stowed position
before lowering body. Refer to Body Rod in Stowed
Position photo.
For proper fuel and lubricants refer to Specifications.
FILL FUEL TANK
Body Rod in Engaged Position
Fill the fuel tank using clean, fresh, automotive grade
unleaded gasoline (85 octane rating minimum).
21
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Assembly Instructions
CHECK ENGINE COOLING SYSTEM
DANGER
Checkthattheenginecoolingairintakescreenisfree
of obstruction by grass clippings or debris and clean
if required. Also, cylinder head cooling fins should be
inspected and cleaned if any build-up of debris is
noted. Contact your Walker dealer to perform this
procedure.
Handlegasolinewithcare. Gasolineishigh-
ly flammable and its vapors are explosive.
Use safe refueling procedures:
• DO NOT fill fuel tank with the engine run-
ning.
CHECK SECURITY OF DRIVE TIRE MOUNT-
ING NUTS
• If the engine is hot, allow to cool before
refueling.
The eight (8) Drive Tire mounting nuts should each
be torqued to 75-85 ft-lbs. (101.7-115.2 N•m).
• Use an approved fuel container.
• Fuel the mower outdoors.
INSPECT TWO (2) DRIVE BELTS
Engine/PTO and Ground Drive.
• DO NOT smoke while refueling.
• Avoid spilling fuel; use a funnel or spout.
CHECK HYDROSTATIC TRANSAXLE OIL LE-
VEL
• DO NOT overfill the fuel tank; fill up to
about 1 in. (25 mm) below the top of tank.
Refer to LUBRICATION for Transaxle 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.
CHECK TIRE PRESSURE
Deck Caster Wheel = 20 PSI (137 kPa)
Drive
Rear
=
=
15 PSI (103 kPa)
20 PSI (137 kPa)
IMPORTANT: DO NOT mix oil with gasoline.
Always use fresh, automotive grade unleaded gas-
oline. DO NOT use premium, white, or high-test
gasoline. DO NOT use additives, such as carburetor
cleaners, deicers, or moisture removing agents. DO
NOT use gasoline blended with methyl alcohol.
CHECK AND CLEAN GRASS BUILDUP
UNDERNEATH MOWER DECK
Refer to CLEANING in Maintenance Instructions for
deck cleaning information.
CHECK ENGINE CRANKCASE OIL LEVEL
DANGER
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.
Never operate cutter blades with deck in
raised position because it is hazardous.
CHECK AND SERVICE ENGINE AIR CLEAN-
ER SYSTEM
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 posi-
tion.
• Checkcondition, cleanliness, and security of the
complete air filter element (clean air filter every
100 hours). For detailed procedures, refer to
CLEANING the Air Cleaner System in Mainte-
nance Instructions.
22
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Assembly Instructions
CHECK MOWER BLADE CONDITION, SHARP-
NESS, AND SECURITY OF MOUNTING
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.
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.
Tilt-Up Latch
PERFORM ANY ADDITIONAL PROCEDURES
called for on the MAINTENANCE SCHEDULE
CHART in Maintenance Instructions.
Deck Secured in Tilt-Up Position
CAUTION
Do not operate machine with deck tilt-up
pivot joint unlocked.
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.
23
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Operating Instructions
CONTROL IDENTIFICATION, LOCATION, AND
FUNCTION
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.
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.
OFF
ON
Ignition Switch
The ignition switch is located on the right front of the
body and is used to start and stop the engine. The
switch has three positions: “O” is the OFF position,
RUN is the position the key returns to after starting,
and “S” is the START position. When starting the
engine, turn the key clockwise to the “S” position. Do
not hold the key in the “S” position longer than 10
START
Ignition Switch
Parking Brake
Steering
Levers
Forward Speed
Control (FSC)
Choke
Throttle
Body Latch
Hourmeter
Ignition
Switch
Blade Clutch
(PTO)
Operating Controls
24
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Operating Instructions
Engine Choke
Forward Speed Control (FSC)
The choke control lever (black knob) is located on
the left side of the seat. To start a cold engine, move
the choke control forward to the ON position. After
engine starts, move choke control toward the OFF
position, keeping enough choke to allow the engine
to run smoothly as it warms up. As soon as possible,
move the choke to the OFF position. A warm engine
requires little or no choke for starting.
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 position,
a friction lock holds any forward speed setting from
0 to 7 mph (0 to 11.3 km/h). The ground speed is pro-
portional to the lever position; the further the lever is
advanced forward, the faster the tractor moves. It is
not necessary to hold the FSC in position since the
friction lock maintains the selected lever position.
Pulling back on the steering levers overrides the
FSC setting and slows or stops forward 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.
IMPORTANT: Make sure the choke is in the OFF
position during normal engine operation; running
with the choke in the ON position CAN damage the
engine.
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.
Steering Levers
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
levers operate only with a backward pulling move-
ment 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.
Throttle
Choke
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.
Choke and Throttle Location
PTO Switch
The PTO toggle switch is located on the RH front of
the body and has two positions: ON (ENGAGE) and
OFF (DISENGAGE) - positioning switch "ON" acti-
vates the electromagnetic blade drive clutch while
the blade brake is applied when the switch is moved
to "OFF".
25
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Operating Instructions
Parking Brake
Hourmeter
The hourmeter, which is located on the left front of
the body, displays operating time accumulated
while the ignition switch is in the ON position.
The parking brake functions by locking a detent arm
into the transaxle outer control gear teeth. Moving
the lever BACKWARD engages the parking brake;
moving the lever FORWARD releases the brake.
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.
IMPORTANT: Stop the tractor completely before
engaging the parking brake. The parking brake uses
a positive mechanical lock similar to the PARK posi-
tion 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 transaxle.
Procedure
Interval*
Reminder
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 allow the brake
detent to set into the teeth.
C
H
G
Oil Change
(Break-In)**
4-6 Hours
OIL
Lubricate
and Check
Levels
24-26 Hours
LUBE
Transaxle Lockout Rods
C
H
G
Oil Change
49-51 Hours***
OIL
The transaxle lockout rods disengage the transax-
les. By lifting the rods up and locking them into place
with the shoulder on the rod in the chassis notch, the
transaxles are released to permit freewheeling. By
releasing the rods and recessing them back toward
the chassis, the transaxles are engaged for normal
operation. The transaxle rods in the LOCKOUT
position are used to enable moving the machine
without the engine running (e.g., for service). Refer
to TRANSAXLE LOCKOUTS in this section for
operating instructions.
*
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.
NOTE: The transaxle lockout rods ends should be
completely retracted against the body, otherwise
operation of the transaxle may be erratic.
NOTE: The blinking hour glass on the display
means that the meter is operating properly.
Hydro Lockout
Rods
Hydro Lockout Rod Location
Hourmeter
26
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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
Disengaged
Position
BLADE CLUTCH
(PTO)
Fast
Throttle
Position
Engaged
Position
Disengaged
Position
Idle
Position
THROTTLE
ON Position
Engaged
Position
PARKING
BRAKE
OFF Position
CHOKE
Operating Controls (Top View from Drivers Point of View)
27
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Operating Instructions
STARTING THE ENGINE
IMPORTANT: DO NOT crank the engine con-
tinuously for more than 10 seconds at a time. If
the engine does not start, turn the key to the
OFF position and allow a 60 second cool-down
period between starting attempts. Failure to fol-
low these guidelines can damage the starter
motor and shorten battery life.
CAUTION
Before operating the mower, read and un-
derstand all Safety Instructions and Operat-
ing Instructions.
3. After the engine starts, gradually move the
choke to the OFF position, keeping enough
choke on to allow the engine to run smoothly as
it warms up. As soon as possible, move the
choke to the OFF position.
WARNING
NEVER run the engine in an enclosed or
poorly ventilated area. Engine exhaust
contains carbon monoxide, an odorless
and deadly gas.
IMPORTANT: Make sure the choke is in the
OFF position during normal engine operation;
running with the choke in the ON position CAN
damage the engine.
ADJUSTING GROUND SPEED AND STEERING
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.
CAUTION
Learn to START, STOP, and MANEUVER
the mower in a large, open area.
NOTE: Release parking brake to prevent extra
load on the starter if the transmission neutral is
slightly out of adjustment.
If the operator has not operated a machine
with LEVER STEERING OR DUAL TRAN-
SAXLES, steering and ground operation
should be learned and practiced until the
operator is completely comfortable han-
dling the machine BEFORE ATTEMPTING
TO MOW.
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 adjust-
ed before operating the mower. DO NOT
disconnect safety switches; they are for
the operator’s protection.
DANGER
Keep feet on footrest at all times when the
machine is moving.
2. Move the choke lever to the ON position and
move the throttle 1/4 to 1/2 open (toward FAST).
Turn the ignition switch to the START position to
start the engine. Release the key to RUN posi-
tion as soon as the engine starts.
NOTE: The choke may not be required if the
engine is warm.
28
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Operating Instructions
WARNING
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.
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.
♦ 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.
NOTE: This is exactly the same procedure
used to normally stop and park the machine.
♦ Learn to operate the mower with your left
handonthesteeringleversandrighthandon
Forward Speed Control. The use of two
hands on the steering levers tends to cause
overcontrol.
NOTE: If the FSC lever will not stay in the
selected position, the friction lock needs to be
adjusted. Contact your Walker Dealer.
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.
♦ 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).
Pull Steering
Levers with
Left Hand
♦ 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.
Forward Speed Control
(FSC)
1. Move the FSC out of NEUTRAL-PARK position
to the desired forward speed. DO NOT hold for-
ward 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).
Keep Feet on Footrest
when Moving
Correct Operator Hand Position on the Controls
29
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Operating Instructions
3. Reverse direction of the mower by pulling both
levers backward.
IMPORTANT: DO NOT engage the blade clutch
when transporting the mower across drives, side-
walks, loose materials, etc. DO NOT engage the
blade clutch with the PTO shaft disconnected
(the mower deck removed from tractor).
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.
Engaged
Position
5. Stop ground travel by pulling both steering
levers backward to the NEUTRAL-PARK posi-
tion (tractor not moving) and then moving the
FSC lever to the NEUTRAL-PARK position.
Blade Clutch Engaged
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.
Disengaged
Position
ENGAGING THE MOWER
1. Set the engine throttle at about 1/2 speed. DO
NOT attempt to engage the blade clutch at
high engine speeds. This will drastically short-
en drive belt and clutch life. Use only moderate
engine speed when engaging the blade clutch.
2. Pull up the blade clutch toggle switch to engage
the mower blades.
Blade Clutch Disengaged
CAUTION
CAUTION
If the cutting blades strike a stationary
object while mowing, stop the mower im-
mediately, disconnect the spark plug
wires, lift the deck, and inspect the deck
and blades thoroughly for damage. Make
sure that the blade timing has not been
disturbed (the blades should be at 90 de-
grees to each other). Refer to REPLAC-
ING/REPAIRING the Blade Overload Shear
Bolts in Maintenance Instructions if blades
are out of time. Also, make sure the blade
retaining nuts are torqued to 60 ft-lb (81.3
N m).
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.
30
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Operating Instructions
STOPPING THE MACHINE
ADJUSTING CUTTING HEIGHT
1. Slow the engine to idle; put the throttle in the
WARNING
IDLE position.
2. Pull the steering levers to the NEUTRAL-PARK
position and then move the FSC lever backward
to the NEUTRAL-PARK 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.
3. Disengage the blade clutch.
IMPORTANT: DO NOT disengage the blade
clutch with high engine speed (above 1/2
throttle) since the brake action on the blade drive
will cause premature wear of the Engine/PTO
Belt and electric clutch/brake.
Cutting height is adjusted by positioning the four
retainer hitch pins in a series of seven vertical
holes on the deck support pins. Lift handles have
been provided on each end of the deck to assist in
raising the deck while positioning the hitch pins. Cut-
ting heights range from 1 in. (25 mm) [top holes] to
4 in. (102 mm) [bottom holes] in 1/2 in. (13 mm)
increments.
WARNING
A brake stops the cutter blades from free-
wheeling within five (5) seconds after dis-
engaging the clutch. If the brake system
malfunctions and the blades do not stop
within five (5) seconds, the brake should
be repaired or replaced before operating
the mower. Contact your Walker Dealer.
Lift Handle
4. Turn the ignition switch OFF.
Deck Support Pin
Hitch Pin
WARNING
Remove the key from the ignition switch
when leaving the mower unattended. This
will prevent children and inexperienced
operators from starting the engine.
Cutting Height Adjustment
5. Engage the parking brake.
IMPORTANT: The transaxles 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 slippage in the
transaxles, especially when transmission fluid
is warm.
31
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Operating Instructions
TRANSAXLE LOCKOUTS
IMPORTANT: DO NOT TOW this mower with the
transmission lockout engaged. Towing can produce
excessive internal pressure and damage the
transaxle.
Hydro Lockout Rod
To move the mower with the engine NOT running
(dead battery, maintenance, etc.), the transaxles are
unlocked (released).
1. Raise the body.
2. Pull up the transaxle lockout rods on both the
RH and LH transaxles and secure into place by
shouldering both rods in the chassis notch area.
Hydro Lockout Rod - Normal Operating Position
RECOMMENDATIONS FOR MOWING
3. The mower will “freewheel” with the rods in the
LOCKOUT position. The levers must be in the
highest position to completely unlock the
transmissions.
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.
Hydro Lockout Rod
• 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. 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.
Hydro Lockout Rod - Freewheel Position
4. After moving the mower, release the rods, plac-
ing them in the normal OPERATING position.
The transmission rod ends should be com-
pletely retracted against the chassis, otherwise
operation of the transmission maybe erratic.
• 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.
• Use a slow setting on the FSC for trimming
operations.
32
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Operating Instructions
• Make sure the mower is leveled properly for a
smooth cut. Refer to Deck Leveling in Assembly
Instructions.
Maximum Recommended
Side Slope - Do Not Operate
on Steep Slopes
• 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 transaxles 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 back-
ward).
22 in.
20°
• 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.
60 in.
Maximum Recommended Side Slope
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) may be damaged by moving the tractor.
The tilt-up configuration should only be used when
the tractor is parked.
Discharge
Shield
• 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.
Side Discharge Shield in Lowest Position
• 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.
• 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.
33
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CAUTION
Maintenance Instructions
Maintenance procedures requiring special training or
tools should be performed by a trained technician.
MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL MB
25
Hours
50
Hours
100
Hours
Ref.
Page
Service Item
Daily
Yearly
Check Engine Crankcase Oil Level
Check/Clean Engine Air Cooling System*
Clean Grass Buildup Under Deck
Service Mower Blades
x
x
x
x
x
36
41
42
44
43
37
40
44
45
45
41
41
36
36
Check Security of Air Cleaner System
Lubricate Grease Fittings and Oil Points*
Check Transaxle Fluid
x
x
x
x
x
x
x
Check Tire Pressure
Check Drive Belts (Engine, PTO, Ground Drive)
Check PTO and Deck Gearbox Oil Seals
Inspect Air Filter Paper Element*
Clean and Re-Oil Air Filter Foam Element
Change Engine Crankcase Oil**
Change Engine Oil Filter
x
x
x
x
Check Security of Drive Tire
Mounting Nuts (75-85 ft-lbs.)
22
Clean Transaxle Cooling Fins
Replace Fuel Filter
43
49
x
CAUTION
More often in extremely dusty or dirty conditions
(see notes about air cleaner element under
IMPORTANT TIPS FOR CARE OF
When performing maintenance with the
mower body raised, a safety prop should
be installed from back of body to chassis
frame (fail-safe protection in case of fail-
ure of body lift support).
BRIGGS & STRATTON ENGINE)
Change engine oil and filter after first 8 hours
of operation of a new engine (break-in period)
34
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Maintenance Instructions
BRIGGS & STRATTON TIPS
IMPORTANT TIPS FOR CARE OF THE
BRIGGS & STRATTON ENGINE
Air Cleaner
• Use only Briggs & Stratton air cleaner elements.
Aftermarket 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.
Fuel System
• Fuel must be clean - free from water, dirt, and or-
ganic material.
• Clean the fuel filter on a regular basis and when
contamination is suspected or found in the fuel.
• 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 loss of engine power.
Starting
• 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.
• When the air filter element is removed or re-
placed, make sure all dust is cleaned out of the air
cleaner body. Use a damp cloth and wipe the inte-
rior of the air cleaner body clean (a little dirt left here
will be sucked into the engine and reduce engine
life). When the filter is reinstalled, make sure the el-
ement is held tight and straight in the air cleaner
body for proper seating and sealing.
• Match crankcase oil viscosity to the ambient tem-
perature, allowing the engine to crank faster and
start easier.
• Allow engine to run at idle for a few seconds be-
fore stopping engine to avoid run-on or backfiring.
Cooling System
Oil
• Keep engine air intake screen and cylinder head
fins free of grass clippings, chaff, and dirt. Inspect
intake screen and cooling fins for cleanliness and
damage.
• 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.
• Operate the engine at full speed when mowing.
This will allow the engine to produce full horsepower
and move more cooling air through the engine cool-
ing fins.
• Use only Briggs & Stratton oil filters. Aftermarket
filters may not seal properly and/or have the in-
correct pressure relief valve for proper lubrication.
35
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Maintenance Instructions
LUBRICATION
LUBRICATION
IMPORTANT: DO NOT operate engine without
sufficient oil supply in the crankcase. DO NOT
operate with oil level below the LOW mark or
above the FULL 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.
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 ser-
viced with 10W-30, Service Class SG oil from the
factory. The oil should be changed after the initial
engine break-in period of 5-8 hours. Thereafter,
change oil after every 50 hours of operation.
Operating
Range
FULL
Mark
Checking Engine Crankcase Oil Level
LOW
Mark
Check the engine crankcase oil level before use and
after each 8 hours of continuous operation.
Dipstick Operating Range
IMPORTANT: The importance of checking and
maintaining the proper crankcase oil level cannot be
overemphasized. Check the oil level BEFORE
EACH USE.
5. If additional oil is needed, refer to Specifications
for proper crankcase lubricant. Fill to the FULL
mark.
1. Park the mower on a level surface with the
engine 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].
IMPORTANT: DO NOT overfill crankcase [oil
above FULL level] as this CAN result in engine
overheating, loss of power, and possible
engine damage.
Changing Engine Crankcase Oil/Oil Filter
IMPORTANT: NEVER check or add oil with the
engine running.
Change the engine crankcase oil after every 50
hours of operation and the oil filter after every 100
hours of operation as follows:
2. Before removing the dipstick, clean the area
around the dipstick to keep any dirt or debris out
of the engine.
1. Park the mower on a level surface with the
engine stopped. The engine oil should be
warm before draining. If not warm from opera-
tion, start the engine and run a few minutes to
warm the oil.
3. Remove the dipstick, wipe off with a clean rag,
then reinsert the dipstick into the tube and press
all the way down.
4. Remove the dipstick again and check the oil
level on the dipstick. The oil level should be
within the “Operating Range” on the dipstick
(between the LOW mark and the FULL mark).
2. Before removing the dipstick, clean the area
around it to keep any dirt or debris out of the
engine.
36
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Maintenance Instructions
LUBRICATION
3. Remove the dipstickand oil drain plug, and drain
oil into a suitable container. Be sure to allow
ample time for complete drainage.
7. Install the new oil filter on the engine. Turn the
oil filter clockwise until the rubber gasket con-
tacts the sealing surface, then tighten the filter
an additional 1/2 to 3/4 turn.
4. Before removing the oil filter, clean the area
around the filter to keep dirt and debris out of the
engine.
8. Reinstall the drain plug.
9. Fill the crankcase with new, clean oil. Use only
crankcase lubricants recommended by the
engine 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 assure
proper lubrication in hot weather. Fill to FULL
mark on the dipstick; crankcase capacity is 1.5
quarts (1.4 liters) when changing oil and filter.
5. Remove the old oil filter and wipe off the filter
mounting surface on the engine.
Oil Fill
IMPORTANT: Check the dipstick reading be-
fore pouring in the last 1/2 pint of oil and fill only
to the FULL mark. The oil level should never be
over the FULL mark on the dipstick; overfilling
can result in engine overheating and loss of
power.
Dipstick
Dipstick and Oil Fill
(view from above left side of tractor)
10. Start the engine and check for oil leaks around
the oil filter. Stop the engine, recheck the oil lev-
el, and add oil if necessary. (When the engine
is first operated with a new oil filter, the oil level
will drop slightly as the filter is filled with oil.)
Grease Fitting and Oil Point Lubrication
Lubricate the grease fittings and oil points after
every 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.
Oil Filter
Oil Drain
NOTE: PTO universal joints (on the deck and trac-
tor) require routine lubrication after every 8 hours of
running time.
Oil Drain and Oil Filter Locations
(view from above right side of tractor)
6. Apply a thin coating of new oil to the rubber gas-
ket on the replacement oil filter.
NOTE: The pillowblock bearings on the PTO drive
shaft are a sealed, relubricatable-type bearing.
Grease lightly once per year using care to not
over-lubricate and damage the seals.
IMPORTANT: Use ONLY oil filters from the
engine manufacturer. Aftermarket oil filters may
not seal properly and/or may not have the cor-
rect pressure relief valve for proper lubrication.
37
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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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38
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Maintenance Instructions
LUBRICATION
1
1
2
3
2
4
5
6
4
7
7
7
6
7
9
8
9
21 & 24
10
11
12
12
18 & 23
13
14
20
22
15
16
21
17
18
20
19
Chassis and Deck Lubrication Points
39
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Maintenance Instructions
LUBRICATION
Mower Deck Gearbox Lubrication
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
assembly, and oil flows freely between them. The
gearboxes are permanently lubricated (oil filled) and
sealed requiring no scheduled lubrication. However,
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 environment.
If an oil leak is noted, replace the oil seal and relu-
bricate 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.
Transaxle Lubrication
• The transaxle oil lubrication is SAE 20W-50 en-
gine oil.
Blade Drive
Gearboxes
• Inspect both transaxle cases and hoses after ev-
ery 100 hours of operation for visible leaks.
• The fluid levels for each transaxle can be
checked visually by looking at the fluid levels in each
expansion reservoir. When the transaxles are cold,
the fluid level in the expansion reservoirs should be
between 1/4" and 1/2" (.64 cm and 1.27 cm).
Tee
Gearbox
Mower Deck Gearboxes
(shown with gearbox cover removed for clarity)
2. Clean the area around the individual gearbox
cover plates to prevent contaminants from
entering the gearcase.
Reservoir Cap
3. Remove the screws securing the cover plates
on the blade drive gearboxes.
Hot Level
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).
Cold Level
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.
Expansion Reservoir Location
40
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Maintenance Instructions
CLEANING
CLEANING
Clean these areas
of dirt and debris
Engine Air Cooling System
To prevent engine overheating and possible engine
damage, clean grass clippings, chaff and dirt from
the rotating engine air intake screen every 8 hours of
operation. In certain mowing conditions (dry grass,
leaves, tree "cotton", etc.) it may be necessary to
check and clean this area several times each day to
prevent engine overheating. Also, visually check
inside cylinder head shroud and between cylinder
head fins for material packed in this area which
would prevent cooling airflow; remove shroud and
clean as required.
IMPORTANT: Yearly or every 100 hours, remove
engine cooling shroud and clean cylinder head cool-
ing fins to prevent overheating. Make sure cooling
shroud is reinstalled properly.
Clean Cooling Fins and Fan
Air Cleaner System
The engine is equipped with a paper air cleaner ele-
ment with an oiled foam pre-cleaner which
surrounds the paper element. Clean and re-oil the
foam pre-cleaner every 25 hours; more often in
dusty/dirty conditions. Clean the paper element
every 100 hours and replace yearly (or when dirty or
damaged). Service the air filter as follows:
• Remove air cleaner cover and remove foam pre-
cleaner by sliding it off the paper element.
• Wash foam pre-cleaner in liquid detergent and
warm water.
• Wrap foam pre-cleaner in cloth and squeeze dry
Rotating Engine Screen
(do not wring).
Keep Engine Screen Clean
• Saturate foam in clean engine oil. Squeeze
foam to distribute and remove excess oil.
CAUTION
• Remove the paper filter element by pulling it out
of the air cleaner body.
Operating the engine with a blocked air in-
take screen, dirty or plugged cooling fins,
and/or cooling shrouds removed will
cause engine damage from overheating.
• Clean the filter element using low pressure com-
pressed air [less than 100 PSI (689 kPa)]. Blow out
the filter from the interior of the element while turning
the element.
NOTE: Washing the element in water or cleaning
solution is not recommended. Replace the element
if it does not clean up with compressed air.
41
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Maintenance Instructions
CLEANING
• 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 nec-
essary.
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.
• Use a clean, damp cloth and wipe the interior of
the air cleaner air cleaner body clean. Use special
care to clean both the inside and outside surfaces
of the outlet tube.
• Install foam pre-cleaner over dry element and re-
assemble onto engine. Tighten knob mounting air
cleaner element securely, 1/2 to 1 turn after contact-
ing cover, but do not over-tighten. Make sure ele-
ment is sealed tightly against the element cover and
base plate. Reinstall air cleaner cover.
Tilt-Up Latch
Deck Secured in Tilt-Up Position
3. Clean grass buildup underneath the deck using
a pressure washer (and scraper if required).
Clips
Cover
NOTE: If the buildup is severe, it may be easier
to clean the deck by removing the deck assem-
bly from the tractor and standing the desk
assembly on its “nose”.
Knob
Cartridge
Plate
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.
Pre-Cleaner
and Cartridge
Foam
Pre-Cleaner
Body
4. Lower the deck to the normal operating position
and re-engage the deck lock levers.
Air Cleaner Components
CAUTION
Grass Buildup in Mower Housing
Do not operate machine with deck tilt-up
pivot joint unlocked.
DANGER
Before raising or removing the mower
deck for cleaning, stop the engine, remove
the ignition key, and disconnect the spark
plug wires.
1. Raise the deck lock lever handle on each side of
the carrier frame and pull out to release carrier
frame for tilting action.
42
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CLEANING/
CHECKING/SERVICING
Maintenance Instructions
Transaxle Cooling Fins
Security of Air Cleaner System
NOTE: The following inspection is only an external
inspection and should be done without “disturb-
ing” the filtration components.
Keeping the cooling fins on the transaxles clean and
free of obstruction is essential to avoid overheat-
ing the transmission fluid and shortening
transmission life. The cooling fins should be
checked every 100 hours; and cleaned if
necessary.
On a daily basis, visually inspect the external condi-
tion of the air cleaner cover.
Check 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.
To clean the fins, use compressed air and/or a pres-
sure 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.
Battery
NOTE: For initial battery service during setup, refer
to Battery Service in Assembly 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, contact your
dealer immediately to avoid overheating and dam-
aging the transaxle.
IMPORTANT: Make sure battery is securely
mounted in the frame. A loose battery may cause
damage to the case resulting in acid leakage and
severe damage to the machine. A hazard may be
created by damage to critical working parts and
safety systems.
An additional procedure in maintaining transaxle
cooling is to inspect the cooling fans. Replace the
fan(s) if blades are missing or damaged.
Cleaning the Terminals
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.
Cooling Fins
Charging the Battery
DANGER
Cooling
Fan
BATTERIES PRODUCE EXPLOSIVE
GASES
• Charge the battery in a well-ventilated
area, so that gases produced while charg-
ing can dissipate.
Transaxle Cooling Fins
CHECKING/SERVICING
• Keep sparks, flames, and smoking ma-
terials away from the battery at all times.
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 spark plug
wires.
• Make sure the battery cap vents are open
(check manifold vent on each cap).
• Make sure the battery charger is un-
plugged before connecting or discon-
necting cables to the battery.
43
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Maintenance Instructions
CHECKING/SERVICING
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:
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.
• Charge the battery at 15 amps for 10 minutes.
DO NOT exceed 20 amps maximum recommended
charging rate. Charge until specific gravity is at
least 1.250. Total charging time should not exceed
one (1) hour.
WARNING
Tire Pressure
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.
Inflate tires to pressures shown below:
Deck Caster Wheel = 20 PSI (137 kPa)
Drive
Rear
=
=
15 PSI (103 kPa)
20 PSI (137 kPa)
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
using a rag or a thick, padded glove, while loos-
ening and removing the nut, lock washer, and
flat washer that mounts the blade.
Sharpen Mower Blades
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/
REPAIRING the Mower Blades in this section).
Use the 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: Blades can be sharpened with an elec-
tric blade sharpener, conventional electric
grinder, or a hand file.
NOTE: Keep blades sharp - cutting with dull
blades not only yields a poor mowing job but slows
the cutting speed of the mower and causes extra
wear on the engine and blade drive by pulling hard.
CAUTION
1. Stop the engine, remove ignition key, and dis-
connect the spark plug wires before raising the
mower deck to service blades.
ALWAYS wear eye protection and gloves
when sharpening a blade.
2. Raise the deck and secure it in the tilt-up posi-
tion (refer to Deck Secured in Tilt-Up Position
photo in CLEANING of Grass Buildup in
Mower Housing in this section).
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 generally main-
tained by removing an equal amount of material
from each end of the blade when sharpening.
DANGER
NEVER operate cutter blades with the
deck in the raised position.
44
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Maintenance Instructions
CHECKING/SERVICING
Mower Deck Gearbox Oil Seals
Intersection
Wear Area
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 gear-
box. This seal is protected by the trash guard on the
blade hub and seal protector plate on the housing,
but is still vulnerable to seal damage due to operating
in an adverse environment. The mower blade must
be removed for inspection of the seal, so it is recom-
mended to inspect the gearbox seals when
blades are removed for sharpening. If an oil leak
is noted, the seal should be replaced and the gear-
box assembly relubricated. Refer to Mower Deck
Gearbox Lubrication in this section.
Sharpen at Original
30° Angle
30°
Wing Tip
Do Not Grind or
Sharpen on Underside
Mower Blade Profile For Sharpening
Spark Plugs
Every 100 hours, remove the spark plugs, inspect,
clean, and reset the gap (or replace with a new
plug). Clean spark plug with a wire brush. If the
electrodes are burned short or pitted, replace the
plug (refer to Specifications for the proper type of
replacement plug). Check the spark plug gap with a
wire-type feeler gauge and set the gap between
0.028 and 0.032 in. (0.7 and 0.8 mm). Reinstall and
tighten to 17 ft-lb (23 N·m). Both spark plugs should be
replaced yearly.
Blade Balancer
Breaker Points
The Briggs & Stratton engine is equipped with elec-
tronic ignition. No breaker points, maintenance, or
adjustments are necessary with this system. Con-
tact an authorized Briggs & Stratton engine dealer in
case of ignition failure.
Blade Balanced on Magnetic
Wall-Mounted Balancer
Fuel Lines and Clamps
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).
Every year, inspect the fuel 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.
Drive Belts
Raise the body and inspect the condition of the two
(2) drive belts after every 25 hours of operation --
engine/PTO drive and ground drive. If the belts show
signs of cracking or deteriorating, the belts
should bereplaced. Refer to REPLACING/REPAIR-
ING the Drive Belts in this section.
45
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CHECKING/SERVICING/
REPLACING/REPAIRING
Maintenance Instructions
Blade Brake Action
REPLACING/REPAIRING
DANGER
WARNING
To prevent accidental starting of the
engine when replacing parts or repairing
the machine, remove the key from the
ignition switch and disconnect the spark
plug wires.
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 by
engaging the blade clutch (PTO), operating the
engine at full throttle, then disengaging the clutch
and measuring how quickly the blades stop. Watch
the rotation of the blade drive shaft 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 -- repair the brake before operating
the mower.
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.
Drive Belts
There are two (2) individual belts on the machine:
• Engine/PTO Belt
• Ground Drive Belt
The belts may be removed and replaced using the
procedures described on the following pages.
Ground Drive Belt
Engine/PTO
Belt
Belt Locations
46
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Maintenance Instructions
REPLACING/REPAIRING
Engine/PTO Belt
Remove Bolts to Access
1. To remove the engine/PTO belt:
Engine/PTO Belt
a. Remove belt guard from underneath muf-
fler. Refer to Remove Belt Guard photo.
b. Relax the belt by depressing the spring-
loaded idler arm.
c. Roll the belt off the pulley and remove the
belt.
Remove Belt Guard
Electric
Clutch
Idler
Pulley
Idler Arm
Tension
Spring
Idler Pulley
Push Idler Pulley
to Relax Belt
Engine/PTO
Belt
PTO Drive
Pulley
Engine/PTO Belt (Disengaged)
2. Reverse the removal procedure to replace the
engine belt.
Electric
Clutch
Idler
Pulley
Idler Arm
Tension
Spring
Idler Pulley
PTO Drive
Pulley
Engine/PTO
Belt
Engine/PTO Belt (Engaged)
47
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Maintenance Instructions
REPLACING/REPAIRING
Ground Drive Belt
b. Slide belt off pulleys, then release the
idler.
1. To remove the ground drive belt:
a. Raise the spring-loaded idler to relax belt.
RH Hydro-Gear
Ground Drive
Belt
LH Hydro-Gear
Drive Pulley
Idler Pulley
Tension
Spring
Raise Idler Pulley to
Relax Belt
Hydro Idler
Arm
Ground Drive Belt Assembly (Disengaged)
2. Reverse the procedure to install the ground
drive belt.
RH Hydro-Gear
Ground Drive
Belt
LH Hydro-Gear
Drive Pulley
Idler Pulley
Tension
Spring
Hydro Idler Arm
Ground Drive Belt Assembly (Engaged)
48
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Maintenance Instructions
REPLACING/REPAIRING
Fuel Filter
Blade Overload Shear Bolts
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.
Model MB is equipped with an in-line fuel filter.
Visually inspect the filter periodically, and replace
the filter yearly.
In-Line
Fuel Filter
Cutting Blade
Shear Bolts
Fuel Filter Location
Cutting Blade Shear Bolts
IMPORTANT: Replace the fuel filter only in a clean
area where the fuel line and connections will not be
contaminated by any dust and dirt.
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.
DANGER
Gasoline is extremely flammable and can
be highly explosive. To minimize danger:
If these bolts shear, remove the blade and install
new bolts. Refer to CHECKING/SERVICING in this
section for Sharpen Mower Blades which describes
the blade removal and installation procedure.
• Use only an approved fuel container for
gasoline.
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.
• DO NOT allow open flames or sparks
near the machine while performing main-
tenance or refueling; DO NOT smoke
while working with fuel.
• Wipe up spilled gasoline immediately
and completely.
PTO Shear Pin
The PTO drive shaft connection to the deck gearbox
hasashearpintoprovideshockloadprotectiontothe
mower deck drive. This system provides primary
shock protection in case of blade impact and will
normally shear before the individual shear bolts on
the blade hub.
1. Expand and slide clamps on either side of the
filter away from filter and pull fuel lines off filter.
2. Replace filter.
When the PTO pin has sheared, use the following
procedure to replace it:
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.)
49
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Maintenance Instructions
REPLACING/REPAIRING
2. Rotate U-joint on shaft to align the shear pin hole
with the hole (and shear pin fragment) in the
shaft. Use apunchtodrivetheremainingportion
of the old shear pin out.
• Examineendsofthebladecarefully, especiallythe
intersection where the flat section of the blade turns
up to form the “wing tip” (refer to Mower Blade Pro-
file for Sharpening illustration in Sharpen Mower
Blades instructions). Since sand and abrasive ma-
terial can wear metal away in this area, the blade
should be replaced when metal thickness has
worn to 1/16 in. (1.6 mm) or less.
3. Install new shear pin and secure with cotter pin.
Set Screw
DANGER
Shear 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
offcreatingaseriouspotentialforinjuryor
damage.
Split Spring Pin
U-Joint
Tube Assembly
U-Joint
Shaft Assembly
• Check the blades for straightness by marking
bladetippositioninsidethedeckhousingandthenro-
tating the opposite end of the blade to the same po-
sition 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
areas, 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 boltsand 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, contact 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.
Reinstalltheblades following procedure from Sharp-
en Mower Blades instructions. If blades are re-
placed, always use Walker original equipment
blades to ensure safety and optimum performance.
Thequalityandperformanceofreplacementblades
offered by other manufacturers cannot be guar-
anteed, they could be dangerous.
Mower Blades
Mower blades are removed and remounted as de-
scribed in the Sharpen Mower Blades instructions.
During the course of sharpening and inspecting
mower blades, if there are any of the following con-
ditions of wear or damage, blades should be re-
placed for reasons of safety and performance of the
machine:
CAUTION
ALWAYS use genuine factory replacement
parts. Substitute parts CAN result in prod-
uct malfunction and possible injury to the
operator.
• 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.
50
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ADJUSTMENTS/
ELECTRICAL SYSTEM
Maintenance Instructions
ADJUSTMENTS
Steering Levers
Tilt-Up Deck Adjustable Stop
When the carrier frame hinge joint is properly ad-
justed, 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
same side to lower the pin. Adjustments are made
by loosening the jam nut and tightening or loosen-
ing the set screws on the Deck Mount Pivot Brack-
ets. Retighten the jam nut when the adjustment is
complete.
An adjustment range of approximately 3 inches is
availableonthesteeringlevers-theleverscanbead-
justed forward or aft depending on the arm length of
the operator. The levers can be adjusted by loosen-
ing the locknut at the pivot point and the locknut hold-
ing the lever in position in the adjustment slide.
Adjust levers into most comfortable position and
tighten both locknuts.
Jam Nut
Locknut
(Position)
Adjustment
Slide
Set Screw
Locknut
(Pivot Point)
Tilt-Up Deck Adjustable Stop
ELECTRICAL SYSTEM
For troubleshooting, refer to the Wiring Diagram.
IMPORTANT: Disconnect both battery cables be-
fore unplugging any wiring connectors or making re-
pairs on the electrical system.
Steering Lever Adjustment
51
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Effective Date 10-01-04
52
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53
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Effective Date 10-01-04
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65
Download from Www.Somanuals.com. All Manuals Search And Download.
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Effective Date 10-01-04
66
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Use only genuine Walker®replacement parts.
Effective Date 10-01-04
68
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LIMITED WARRANTY
FOR
WALKER MODEL MB
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 purchaser
unless the product is used for commercial or 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:
Briggs & Stratton Engine
Hydro-Gear Transaxles
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.
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.
69
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Sound - Model MB
Vibration - Model MB
Sound Test
Vibration Level
Vibration levels at the operators handles
were measured in the vertical, lateral, and
longitudinal directions using calibrated
vibration test equipment.
Sound test conducted was in accordance
with 79/113/EEC and was performed on 14
July 04 under the conditions listed:
Lwa
93
0.6g
Tests were performed on 14 July 04 under the
conditions listed:
General Condition:
Temperature:
Wind Speed:
Humidity:
Clear
LpA
50 (F)o10 (C)o
< 5 mph (< 8 kmh)
52%
General Condition:
Temperature:
Wind Speed:
Humidity:
Clear
86
50 (F)o10 (C)o
< 5 mph (< 8 kmh)
52%
OPERATOR
Barometric Pressure: 24.9" HG (759 mm Hg)
Barometric Pressure: 24.9" HG (759 mm Hg)
WALKER MFG. CO. • 5925 E. HARMONY ROAD, FORT COLLINS, CO 80528 • (970) 221-5614
FORM NO. 040104
PRINTED IN USA
©2004 WALKER MFG. CO
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