PA91
REAR-MOUNT
BOOM MOWER
Published 03/09
Part No. 7191852C
OPERATOR’S MANUAL
This Operator's Manual is an integral part of the safe operation of this machine and must
be maintained with the unit at all times. READ, UNDERSTAND, and FOLLOW the Safety
and Operation Instructions contained in this manual before operating the equipment. C01-
Cover
ALAMO INDUSTRIAL®
1502 E. Walnut
Seguin, Texas 78155
830-372-3551
Email: [email protected]
©2009 Alamo Group Inc.
$0.00
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In order to reduce accidents and enhance the safe operation of mowers, Alamo Industrial, in cooperation
with other industry manufacturers has developed the AEM/FEMA Industrial and Agricultural Mower
Safety Practices video and guide book.
The video will familiarize and instruct mower-tractor operators in safe practices when using industrial
and agricultural mowing equipment. It is important that Every Mower Operator be educated in the oper-
ation of their mowing equipment and be able to recognize the potential hazards that can occur while oper-
ating a mower. This video, along with the mower operator’s manual and the warning messages on the
mower, will significantly assist in this important education.
Your Authorized Alamo Industrial Dealer may have shown this video and presented you a DVD Video
when you purchased your mower. If you or any mower operator have not seen this video, Watch the
Video, Read this Operator’s Manual, and Complete the Video Guidebook before operating your new
mower. If you do not understand any of the instructions included in the video or operator’s manual or if
you have any questions concerning safety of operation, contact your supervisor, dealer or Alamo Indus-
trial.
If you would like a VHS video tape of the video, please email [email protected] or Fax
AEM VHS Video at (830) 372-9529 or mail in a completed copy of the form on the back of this page to
AEM VHS Video 1502 E Walnut Street, Seguin, TX 78155. and request the VHS video version. Please
include your name, mailing address, mower model and serial number.
Every operator should be trained for each piece of equipment (Tractor and Mower), understand the
intended use, and the potential hazards before operating the equipment.
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Alamo Industrial Division is willing to provide
one (1) AEM Mower Safety Practices Video
Please Send Me:
VHS Format – AEM/FEMA Mower Operator Safety Video
DVD Format – AEM/FEMA Mower Operator Safety Video
Mower Operator’s Manual
AEM Mower Operator’s Safety Manual
Phone:
Requester Name
Requester Address:
City
State
Zip Code
Mower Model:
Date Purchased:
Serial Number:
DealerSalesperson:
DealershipLocation:
Dealership Name:
Mail to:
AEM Video Services
1502 E Walnut street
Seguin, TX 78155
Or Fax to:
(830) 372-9529
Or Email to:
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TABLE OF CONTENTS
SAFETY SECTION .............................................................................................................. 1-1
General Safety Instructions and Practices .........................................................................................................1-2
Operator Safety Instructions and Practices .......................................................................................................1-3
Equipment Operation Safety Instructions and Practices ....................................................................................1-5
COnnecting or Disconnecting Implement Safety Instructions and Practices ...................................................1-11
Transporting Safety Instructions and Practices ...............................................................................................1-12
Maintenance and Service Safety Instructions and Practices ...........................................................................1-14
Concluding Safety Instructions and Practices ..................................................................................................1-16
Decal Location .................................................................................................................................................1-17
Decal Description .............................................................................................................................................1-19
Federal Laws and Regulations ........................................................................................................................1-27
ASSEMBLY SECTION ........................................................................................................ 3-1
TRACTOR SELECTION ....................................................................................................................................3-2
Horsepower and Weight Requirements .............................................................................................................3-2
Linkage Requirements .......................................................................................................................................3-2
Linkage Isolation ................................................................................................................................................3-2
Check Chains/ Stabilizers ..................................................................................................................................3-2
Tractor Relief Valve ...........................................................................................................................................3-2
Tractor Hydraulic Flow Rates .............................................................................................................................3-2
P.T.O. Shaft .......................................................................................................................................................3-2
Draft Control .......................................................................................................................................................3-2
TRACTOR PREPARATION ...............................................................................................................................3-3
Fitting Operator Guard .......................................................................................................................................3-3
Ballast Weight ....................................................................................................................................................3-4
JOHN DEERE CONVERSION KIT (81- 30- 059) ..............................................................................................3-4
DELIVERY .........................................................................................................................................................3-5
ATTACHMENT TO TRACTOR ..........................................................................................................................3-5
Si Model .............................................................................................................................................................3-5
Ti Model .............................................................................................................................................................3-6
FITTING CONTROL UNIT IN CAB ....................................................................................................................3-8
OIL REQUIREMENTS .......................................................................................................................................3-9
Tank ...................................................................................................................................................................3-9
Gearbox .............................................................................................................................................................3-9
RUNNING UP PROCEDURE ..........................................................................................................................3-10
PA91 Ti ............................................................................................................................................................3-10
PA91 Si ............................................................................................................................................................3-10
REMOVAL FROM TRACTOR .........................................................................................................................3-11
STORAGE .......................................................................................................................................................3-11
PROPER TORQUE VALUES FOR FASTENERS ...........................................................................................3-12
OPERATION SECTION ....................................................................................................... 4-1
Standard Equipment and Specifications ............................................................................................................4-3
OPERATOR REQUIREMENTS .........................................................................................................................4-4
TRACTOR REQUIREMENTS ...........................................................................................................................4-5
ROPS and Seat Belt ..........................................................................................................................................4-5
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Operator Thrown Object Protection ...................................................................................................................4-5
Tractor Lighting and SMV Emblem ....................................................................................................................4-6
Tractor Ballast ....................................................................................................................................................4-7
Tractor Safety Devices .......................................................................................................................................4-7
Tractor Horsepower ...........................................................................................................................................4-7
3-Point Hitch ......................................................................................................................................................4-8
Hydraulics ..........................................................................................................................................................4-8
Front End Weight ...............................................................................................................................................4-8
Power Take Off (PTO) .......................................................................................................................................4-9
GETTING ON AND OFF THE TRACTOR .........................................................................................................4-9
Boarding the Tractor ........................................................................................................................................4-10
Dismounting the Tractor ...................................................................................................................................4-10
STARTING THE TRACTOR ............................................................................................................................4-11
Connecting Attaching Head to the Boom .........................................................................................................4-12
Connecting Mower Head Hydraulics ................................................................................................................4-12
PRE-OPERATION INSPECTION AND SERVICE ...........................................................................................4-14
Tractor Pre-Operation Inspection/Service ........................................................................................................4-14
Boom Unit Pre-Operation Inspection and Service ...........................................................................................4-15
OPERATING THE BOOM MOWER ................................................................................................................4-21
Machine Controls .............................................................................................................................................4-21
Engaging Drive ................................................................................................................................................4-21
Forward Speed ................................................................................................................................................4-22
Tractor Position ................................................................................................................................................4-22
Operating Speed ..............................................................................................................................................4-22
Working Close In and High ..............................................................................................................................4-22
Breakaway .......................................................................................................................................................4-22
Wire Trap .........................................................................................................................................................4-22
Hedge Cutting Procedure ................................................................................................................................4-23
Lift Float Kit (Optional) .....................................................................................................................................4-25
Flail Types ........................................................................................................................................................4-26
Machine Configuration .....................................................................................................................................4-26
DRIVING THE TRACTOR AND IMPLEMENT .................................................................................................4-27
Starting the Tractor ..........................................................................................................................................4-28
Brake and Differential Lock Setting ..................................................................................................................4-29
Transport Position ............................................................................................................................................4-30
Driving the Tractor and Boom ..........................................................................................................................4-31
OPERATING INSTRUCTIONS ........................................................................................................................4-32
Foreign Debris Hazards ...................................................................................................................................4-34
Bystanders/Passersby Precautions .................................................................................................................4-34
Engaging the Power Take Off (PTO) ...............................................................................................................4-35
Operating Speed and Ground Speed ..............................................................................................................4-36
Operating the Mower .......................................................................................................................................4-36
Shutting Down the Attached Head ...................................................................................................................4-38
TRACTOR, BOOM, AND ATTACHED HEAD STORAGE ...............................................................................4-39
TRANSPORTING THE TRACTOR AND IMPLEMENT ...................................................................................4-40
Transporting on Public Roadways ...................................................................................................................4-40
Hauling the Tractor and Implement ..................................................................................................................4-43
TROUBLESHOOTING GUIDE ........................................................................................................................4-44
LUBRICATION ...................................................................................................................................................5-2
HYDRAULIC SYSTEM ......................................................................................................................................5-3
FLOAT KIT ACCUMULATOR TEST ..................................................................................................................5-3
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HYDRAULIC PUMPS ........................................................................................................................................5-4
FLAILHEAD .......................................................................................................................................................5-4
CABLE OPERATED ARMHEAD CONTROL VALVE ........................................................................................5-5
Replacing Damaged or Worn Spool “O” Rings ..................................................................................................5-5
Main Relief Valve ...............................................................................................................................................5-6
Non-Return Valve ..............................................................................................................................................5-6
CABLES .............................................................................................................................................................5-6
HYDRAULIC RAMS ...........................................................................................................................................5-7
Ram Seal Replacement - General Information ..................................................................................................5-7
Angling Arm .......................................................................................................................................................5-7
Reach Ram ........................................................................................................................................................5-7
ROTOR CONTROL VALVE/RELIEF VALVE .....................................................................................................5-8
Relief Valve ........................................................................................................................................................5-8
Replacing Worn or Damaged “O” Rings ............................................................................................................5-8
P.T.O. GEARBOX ..............................................................................................................................................5-8
HYDRAULIC MOTOR ........................................................................................................................................5-8
Replacing Shaft Seals ........................................................................................................................................5-9
HYDRAULIC HOSES .........................................................................................................................................5-9
Hose Replacement ............................................................................................................................................5-9
Hose Warranty ...................................................................................................................................................5-9
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SAFETY
General Safety Instructions and Practices
A careful operator is the best operator. Safety is of primary importance to the manufacturer and should be to
the owner/operator. Most accidents can be avoided by being aware of your equipment, your surroundings, and
observing certain precautions. The first section of this manual includes a list of Safety Messages that, if
followed, will help protect the operator and bystanders from injury or death. Read and understand these Safety
Messages before assembling, operating or servicing this Implement. This equipment should only be operated
by those persons who have read the manual, who are responsible and trained, and who know how to do so
responsibly.
The Safety Alert Symbol combined with a Signal Word, as seen below, is used throughout this
manual and on decals which are attached to the equipment. The Safety Alert Symbol means:
“ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED!” The Symbol and Signal Word
are intended to warn the owner/operator of impending hazards and the degree of possible injury
faced when operating this equipment.
Practice all usual and customary safe working precautions and above all---remember safety is
up to YOU. Only YOU can prevent serious injury or death from unsafe practices.
Indicates an imminently hazardous situation that, if not avoided, WILL result in DEATH OR
VERY SERIOUS INJURY.
Indicates an imminently hazardous situation that, if not avoided, COULD result in DEATH
OR SERIOUS INJURY.
Indicates an imminently hazardous situation that, if not avoided, MAY result in MINOR
INJURY.
Identifies special instructions or procedures that, if not strictly observed, could result in
damage to, or destruction of the machine, attachments or the environment.
NOTE: Identifies points of particular interest for more efficient and convenient operation or
repair.(SG-1)
READ, UNDERSTAND, and FOLLOW the following Safety Messages. Serious injury or
death may occur unless care is taken to follow the warnings and instructions stated in the
Safety Messages. Always use good common sense to avoid hazards. (SG-2)
Si no lee ingles, pida ayuda a alguien que si lo lea para que le traduzca las
medidas de seguridad. (SG-3)
PA91 03/09
Safety Section 1-2
© 2009 Alamo Group Inc.
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SAFETY
Engine Exhaust, some of its constituents, and certain vehicle components contain or emit
chemicals known to the state of California to cause cancer and birth defects or other
reproductive harm. (SG-30)
Battery posts, terminals and related accessories contain lead and lead compounds,
chemicals known to the state of California to cause cancer, birth defects or other
reproductive harm. (SG-31)
Operator Safety Instructions and Practices
The rotating parts of this machine continue to rotate even after the PTO has been turned off.
The operator should remain in his seat for 60 seconds after the brake has been set, the
PTO disengaged, the tractor turned off, and all evidence of rotation has ceased. (S3PT-10)
“Wait a minute...Save a life!”
Never crawl under a raised Implement supported solely by the Tractor 3-Point hitch.
Release of the control lever or mechanical failure will result in the Implement falling and
possible injury or death. Always securely block up the Implement before crawling
underneath to perform repairs and service. (S3PT-19)
Never operate the Tractor or Implement until you have read and com-
pletely understand this Manual, the Tractor Operator’s Manual, and each
of the Safety Messages found in the Manual or on the Tractor and Imple-
ment. Learn how to stop the tractor engine suddenly in an emergency.
Never allow inexperienced or untrained personnel to operate the Tractor
and Implement without supervision. Make sure the operator has fully
read and understood the manuals prior to operation. (SG-4)
The operator and all support personnel should wear hard hats, safety
shoes, safety glasses, and proper hearing protection at all times for
protection from injury including injury from items that may be thrown by
the equipment. (SG-16)
PA91 03/09
© 2009 Alamo Group Inc.
Safety Section 1-3
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SAFETY
PROLONGED EXPOSURE TO LOUD NOISE MAY CAUSE
PERMANENT HEARING LOSS! Tractors with or without an Implement
attached can often be noisy enough to cause permanent hearing loss.
We recommend that you always wear hearing protection if the noise in
the Operator’s position exceeds 80db. Noise over 85db over an
extended period of time will cause severe hearing loss. Noise over 90db
adjacent to the Operator over an extended period of time will cause
permanent or total hearing loss. NOTE: Hearing loss from loud noise
[from tractors, chain saws, radios, and other such sources close to the
ear] is cumulative over a lifetime without hope of natural recovery. (SG-I7)
Always read carefully and comply fully with the manufacturer’s
instructions when handling oil, solvents, cleansers, and any other
chemical agent. (SG-22)
KEEP AWAY FROM ROTATING ELEMENTS to prevent entanglement
and possible serious injury or death. (SG-24)
Never allow children to play on or around Tractor or Implement. Children can slip or fall off
the Equipment and be injured or killed. Children can cause the Implement to shift or fall
crushing themselves or others. (SG-25)
NEVER use drugs or alcohol immediately before or while operating the
Tractor and Implement.
alertness and coordination and therefore affect the operator’s ability to
operate the equipment safely. Before operating the Tractor or
Drugs and alcohol will affect an operator’s
Implement, an operator on prescription or over-the-counter medication
must consult a medical professional regarding any side effects of the
medication that would hinder their ability to operate the Equipment safely.
NEVER knowingly allow anyone to operate this equipment when their
alertness or coordination is impaired. Serious injury or death to the
operator or others could result if the operator is under the influence of
drugs or alcohol. (SG-27)
Prolonged operation may cause operator boredom and fatigue affecting safe operation.
Take scheduled work breaks to help prevent these potentially impaired operating
conditions. Never operate the Implement and Tractor in a fatigued or bored mental state
which impairs proper and safe operation. (SG-32)
PA91 03/09
© 2009 Alamo Group Inc.
Safety Section 1-4
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SAFETY
Use extreme caution when getting onto the Implement to perform repairs, maintenance and
when removing accumulated material. Only stand on solid flat surfaces to ensure good
footing. Use a ladder or raised stand to access high spots which cannot be reached from
ground level. Slipping and falling can cause serious injury or death. (SG-33)
Avoid contact with hot surfaces including hydraulic oil tanks, pumps, motors, valves and
hose connections. Relieve hydraulic pressure before performing maintenance or repairs.
Use gloves and eye protection when servicing hot components. Contact with a hot surface
or fluid can cause serious injury from burns or scalding. (SG-34)
DO NOT operate this Implement on a Tractor that is not properly maintained. Should a
mechanical or Tractor control failure occur while operating, immediately shut down the
Tractor and perform repairs before resuming operation. Serious injury and possible death
could occur from not maintaining this Implement and Tractor in good operating condition.
(SG-36)
Avoid contact with hot surfaces of the engine or muffler. Use gloves and eye protection
when servicing hot components. Contact with a hot surface or fluid can cause serious injury
from burns or scalding. (SG-38)
Do not put hands or feet under mower decks. Blade Contact can result
in serious injury or even death. Stay away until all motion has stopped
and the decks are securely blocked up. (SGM-09)
Always keep a careful lookout and use extreme care when working around utility and
municipal obstructions. Never allow the Mower to contact any utility, municipal, or other
type structure. Clearly mark all mowing obstructions and consult local utility providers for
a safe code of operation. (SPU-5)
Do not operate the implement while wearing loose fitting clothing. Entanglement of the
clothing with the rotating elements can result in serious injury or even death. Stay clear of
all rotating elements at all times. (SSP-03)
Equipment Operation Safety Instructions and Practices
Never leave the Tractor and Implement unattended while the Implement is in the lifted
position. Accidental operation of lifting lever or a hydraulic failure may cause sudden drop
of unit with injury or death by crushing. To properly park the implement when disconnecting
it from the tractor, lower the stand and put the retaining pin securely in place, or put a secure
support under the A-Frame. Lower the implement carefully to the ground. Do not put hands
or feet under lifted components. (S3PT-1)
PA91 03/09
Safety Section 1-5
© 2009 Alamo Group Inc.
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SAFETY
Use extreme care when lowering or unfolding the implement’s wings. Make sure no
bystanders are close by or underneath the wings. Allow ample clearance around the
implement when folding or unfolding the wings. Use extreme caution around buildings or
overhead power lines. (S3PT-05)
This Implement is wider than the Tractor. Be careful when operating or transporting this
equipment to prevent the Implement from running into or striking sign posts, guard rails,
concrete abutments or other solid objects. Such an impact could cause the Implement and
Tractor to pivot violently resulting in loss of steering control, serious injury, or even death.
Never allow the Implement to contact obstacles. (S3PT-12)
Be sure you have adequate knowledge of the property you will be working on. Take time to
make yourself aware of any area underground lines or cables. Contact with buried lines or
cable could result in serious injury or death. If in doubt about buried utility lines call 811
before digging or 1-800-258-0808. (SBH-6)
Do not operate Mower if excessive vibration exists.
engine. Inspect the Mower to determine the source of the vibration. If Mower blades are
missing or damaged replace them immediately. Do not operate the mower until the
Shut down PTO and the Tractor
blades have been replaced and the Mower operates smoothly. Operating the Mower with
excessive vibration can result in component failure and broken objects to be thrown
outward at very high velocities. To reduce the possibility of property damage, serious injury,
or even death, never allow the Mower to be operated with blades missing. (SFL-4)
Operate this Equipment only with a Tractor equipped with an approved roll-
over-protective system (ROPS). Always wear seat belts. Serious injury or
even death could result from falling off the tractor--particularly during a turnover
when the operator could be pinned under the ROPS. (SG-7)
BEFORE leaving the tractor seat, always engage the brake and/or set
the tractor transmission in parking gear, disengage the PTO, stop the
engine, remove the key, and wait for all moving parts to stop. Place the
tractor shift lever into a low range or parking gear to prevent the tractor
from rolling. Never dismount a Tractor that is moving or while the engine
is running. Operate the Tractor controls from the tractor seat only. (SG-9)
Never allow children or other persons to ride on the Tractor or Implement.
Falling off can result in serious injury or death. (SG-10)
PA91 03/09
© 2009 Alamo Group Inc.
Safety Section 1-6
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SAFETY
Never allow children to operate, ride on, or come close to the Tractor or
Implement. Usually, 16-17 year-old children who are mature and
responsible can operate the implement with adult supervision, if they
have read and understand the Operator’s Manuals, been trained in
proper operation of the tractor and Implement, and are physically large
enough to reach and operate the controls easily. (SG-11)
Do not mount or dismount the Tractor while the tractor is moving. Mount
the Tractor only when the Tractor and all moving parts are completely
stopped. (SG-12)
Start tractor only when properly seated in the Tractor seat. Starting a
tractor in gear can result in injury or death. Read the Tractor operators
manual for proper starting instructions. (SG-13)
Do not operate this Equipment with hydraulic oil or fuel leaking. Oil
and fuel are explosive and their presence could present a hazard. Do
not check for leaks with your hand! High-pressure oil streams from
breaks in the line could penetrate the skin and cause tissue damage
including gangrene. To check for a hose leak, SHUT the unit ENGINE
OFF and remove all hydraulic pressure. Wear oil impenetrable gloves,
safety glasses and use Cardboard to check for evidence of oil leaks. If
you suspect a leak, REMOVE the HOSE and have it tested at a Dealer.
If oil does penetrate the skin, have the injury treated immediately by a
physician knowledgeable and skilled in this procedure. (SG-15)
Never run the Tractor engine in a closed building or without adequate ventilation. The
exhaust fumes can be hazardous to your health. (SG-23)
Do not exceed the rated PTO speed for the Implement. Excessive PTO speeds can cause
Implement driveline or blade failures resulting in serious injury or death. (SG-26)
PA91 03/09
© 2009 Alamo Group Inc.
Safety Section 1-7
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SAFETY
Operate the Tractor and/or Implement controls only while properly seated in the Tractor seat
with the seat belt securely fastened around you. Inadvertent movement of the Tractor or
Implement may cause serious injury or death. (SG-29)
In case of mechanical difficulty during operation, place the transmission in the park
position, set the parking brake, shut down all power, including the PTO and the engine and
remove the key. Wait until all rotating motion has stopped before dismounting. (SG-39)
Do Not operate this equipment in areas where insects such as bees may attack you and/or
cause you to lose control of the equipment. If you must enter in such areas, use a tractor
with an enclosed Cab and close the windows to prevent insects from entering. If a tractor
cab is not available, wear suitable clothing including head, face, and hand protection to
shield you from the insects. Attacking insects can cause you to lose control of the tractor,
which can result in serious injury or death to you or bystanders. Never dismount a moving
tractor. (SG-40)
Mow only in conditions where you have clear visibility in daylight or with adequate artificial
lighting. Never mow in darkness or foggy conditions where you cannot clearly see at least
100 yards(90 m) in front and to the sides of the tractor and mower. Make sure that you can
clearly see and identify passersby, steep slopes, ditches, drop-offs, overhead obstructions,
power lines, debris and foreign objects. If you are unable to clearly see these type of items
discontinue mowing. (SGM-1)
There are obvious and hidden potential hazards in the operation of this
Mower. REMEMBER! This machine is often operated in heavy brush
and in heavy weeds. The Blades of this Mower can throw objects if
shields are not properly installed and maintained. Serious injury or even
death may occur unless care is taken to insure the safety of the operator,
bystanders, or passersby in the area. Do not operate this machine with
anyone in the immediate area. Stop mowing if anyone is within 100 yards
of mower. (SGM-02)
The rotating parts of this machine have been designed and tested for rugged use.
However, the blades could fail upon impact with heavy, solid objects such as metal guard
rails and concrete structures. Such impact could cause the broken objects to be thrown
outward at very high velocities. To reduce the possibility of property damage, serious
injury, or even death, never allow the cutting blades to contact such obstacles. (SGM-4)
PA91 03/09
© 2009 Alamo Group Inc.
Safety Section 1-8
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SAFETY
Extreme care should be taken when operating near loose objects such
as gravel, rocks, wire, and other debris. Inspect the area before
mowing. Foreign objects should be removed from the site to prevent
machine damage and/or bodily injury or even death. Any objects that
cannot be removed must be clearly marked and carefully avoided by the
operator. Stop mowing immediately if blades strike a foreign object.
Repair all damage and make certain rotor or blade carrier is balanced
before resuming mowing. (SGM-05)
Many varied objects, such as wire, cable, rope, or chains, can become entangled in the
operating parts of the mower head. These items could then swing outside the housing at
greater velocities than the blades. Such a situation is extremely hazardous and could result
in serious injury or even death. Inspect the cutting area for such objects before mowing.
Remove any like object from the site. Never allow the cutting blades to contact such items.
(SGM-06)
Mow at the speed that you can safely operate and control the tractor and mower. The
correct mowing speed depends on terrain condition and grass type, density, and height of
cut. Normal ground speed range is from 2 to 5 mph(3-8 kph). Use slow mowing speeds
when operating on or near steep slopes, ditches, drop-offs, overhead obstructions, power
lines, or when debris and foreign objects are to be avoided. (SGM-07)
Avoid mowing in reverse direction when possible. Check to make sure there are no
persons behind the mower and use extreme care when mowing in reverse. Mow only at a
slow ground speed where you can safely operate and control the tractor and mower.
Never mow an area that you have not inspected and removed debris or foreign material.
(SGM-08)
Do not mow with two machines in the same area except with Cab tractors with the windows
closed. (SGM-11)
PA91 03/09
© 2009 Alamo Group Inc.
Safety Section 1-9
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SAFETY
Follow these guidelines to reduce the risk of equipment and grass fires
while operating, servicing, and repairing the Mower and Tractor:
-Equip the Tractor with a fire extinguisher in an accesible location.
-Do Not operate the Mower on a Tractor with an underframe exhaust.
-Do Not smoke or have an open flame near the Mower and Tractor.
-Do Not drive into burning debris or freshly burnt areas.
-Ensure slip clutches are properly adjusted to prevent excessive slippage and plate heating.
-Never allow clippings or debris to collect near drivelines, slip clutches, and gearboxes.
Periodically shut down the Tractor and Mower and clean clippings and collected debris from
the mower deck. (SGM-12)
The Mower is designed for certain mowing applications and is rated to cut up to a specific
size vegetation (see Mower Standard Equipment and Specifications). DO NOT use this
mower to cut vegetation above the Mower’s rated capacity or to cut any type of non-
vegetative material. Only operate this Mower on a properly sized and equipped Tractor.
Operating this Mower in an application for which it is not designed and/or operating the
Mower with the wrong size Tractor can cause Mower component damage and equipment
failure resulting in possible serious injury or death. (SGM-14)
Do not operate or pull the mower into standing water. When uplift or fan type mower blades
contact water they can be severely deflected downward causing possible failure of blade
resulting in serious boldly injury to the operator or bystanders. (SGM-15)
Use extreme caution when raising the Mower above ground level. Stop the Blades from
turning when the Mower is raised and passersby are within 100 yards. Raising the
Mower exposes the Cutting Blades which creates a potentially serious hazard and can
cause serious injury by objects thrown from the Blades or by contact with the Blades. (SPU-1)
PA91 03/09
Safety Section 1-10
© 2009 Alamo Group Inc.
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SAFETY
Rotary Mowers are capable under adverse conditions of throwing
objects for great distances (300 feet or more) and causing serious injury
or death. Follow safety messages carefully.
STOP MOWING IF PASSERSBY ARE WITHIN 100 YARDS UNLESS:
-Front and Rear Deflectors, Chain Guards, or Bands are installed and in good, workable
condition;
-Mower sections or Wings are running close to and parallel to the ground without exposed
Blades;
-Passersby are outside the existing thrown-object zone;
-All areas have been thoroughly inspected and all foreign material such as rocks, cans,
glass, and general debris has been removed.
NOTE: Where there are grass and weeds high enough to hide debris that could be struck
by the blades, the area should be: inspected and large debris removed, mowed at an
intermediate height, inspected, closely with any remaining debris being removed, and
mowed again at desired final height. (This will also reduce power required to mow, reduce
wear and tear on the Mower drivetrain, spread cut material better, reduce streaking, and
make the final cut more uniform). (SRM-01)
Do not turn so sharp or lift mower so high to produce a severe "knocking" of the Driveline
which will cause accelerated wear and breakage of drive train components and could result
in possible injury from the separated Driveline sections. (SRM-04)
Do not let the Blades turn when the Mower Deck is raised for any
reason, including clearance or for turning. Raising the Mower deck
exposes the Cutting Blades which creates a potentially serious hazard
and could cause serious injury or even death from objects thrown from
the Blades. (SRM-07)
COnnecting or Disconnecting Implement Safety Instructions and
Practices
DO NOT use a PTO adapter to attach a non-matching Implement driveline to a Tractor
PTO. Use of an adapter can double the operating speed of the Implement resulting in
excessive vibration, thrown objects, and blade and implement failure. Adapter use will also
change the working length of the driveline exposing unshielded driveline areas. Serious
bodily injury and/or equipment failure can result from using a PTO adapter. Consult an
authorized dealer for assistance if the Implement driveline does not match the Tractor PTO.
(S3PT-14)
PA91 03/09
Safety Section 1-11
© 2009 Alamo Group Inc.
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SAFETY
Always shut the Tractor completely down, place the transmission in park, and set the
parking brake before you or anyone else attempts to connect or disconnect the Implement
and Tractor hitches. (S3PT-15)
Never operate the Tractor and Mower if the Implement input driveline is directly connected
to the Tractor transmission. Tractor braking distances can be substantially increased by
the momentum of the rotating Mower blades driving the Tractor transmission even though
the Tractor clutch has been disengaged. Install an over running clutch between the Tractor
PTO and the Mower driveline to prevent this potentially dangerous situation. (S3PT-16)
When attaching the Implement input driveline to the Tractor PTO, it is important that the
connecting yoke spring activated locking collar slides freely and the locking balls are seated
securely in the groove on the Tractor PTO shaft. Push and pull the driveline back and forth
several times to ensure it is securely attached. A driveline not attached correctly to the
Tractor PTO shaft could come loose and result in personal injury and damage to the
Implement. (S3PT-17)
Before operating the Implement, check to make sure the Implement input driveline will not
bottom out or become disengaged. Bottoming out occurs when the inner shaft penetrates
the outer housing until the assembly becomes solid-it can shorten no more. Bottoming out
can cause serious damage to the Tractor PTO by pushing the PTO into the Tractor and
through the support bearings or downward onto the PTO shaft, breaking it off. A broken
driveline can cause personal injury. (S3PT-18)
Transporting Safety Instructions and Practices
Be particularly careful when transporting the Implement with the Tractor. Turn curves or go
up hills only at a low speed and using a gradual steering angle. Rear mounted implements
move the center of gravity to the rear and remove weight from the front wheels. Make
certain, by adding front ballast, that at least 20% of the tractor’s weight is on the front wheels
to prevent rearing up, loss of steering control or Tractor tip-over. Slow down on rough or
uneven surfaces to prevent loss of steering control which could result in property damage
or possible injury. Do not transport unless 3-Point lift lever is fully raised and in the latched
transport position. Dropping implement in transport can cause serious damage to the
tractor and/or Implement and possibly cause the operator or others to be injured or killed.
(S3PT-02)
Allow sufficient clearance for the Implement to swing outward while turning. Implements
carried behind the Tractor will swing outside the tire path when making turns. Contacting a
solid object while turning will cause equipment damage and possible injury. (S3PT-20)
PA91 03/09
© 2009 Alamo Group Inc.
Safety Section 1-12
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SAFETY
Make certain that the “Slow Moving Vehicle” (SMV) sign is installed in
such a way as to be clearly visible and legible. When transporting the
Equipment use the Tractor flashing warning lights and follow all local
traffic regulations. (SG-6)
Transport only at speeds where you can maintain control of the
equipment. Serious accidents and injuries can result from operating this
equipment at high speeds. Understand the Tractor and Implement and how it handles
before transporting on streets and highways. Make sure the Tractor steering and brakes
are in good condition and operate properly.
Before transporting the Tractor and Implement, determine the proper transport speeds for
you and the equipment. Make sure you abide by the following rules:
Test the tractor at a slow speed and increase the speed slowly. Apply the Brakes smoothly
to determine the stopping characteristics of the Tractor and Implement. As you increase
the speed of the Tractor the stopping distance increases.
Determine the maximum
transport speed not to exceed 20 mph (30 kph) for transporting this equipment.
Test the equipment at a slow speed in turns. Increase the speed through the turn only after
you determine that the equipment can be operated at a higher speed. Use extreme care
and reduce your speed when turning sharply to prevent the tractor and implement from
turning over. Determine the maximum turning speed for you and this equipment before
operating on roads or uneven ground.
Only transport the Tractor and Implement at the speeds which allow you to properly control
the equipment.
Be aware of the operating conditions. Do not operate the Tractor with weak or faulty brakes
or worn tires. When operating down a hill or on wet or rain slick roads, the braking distance
increases: use extreme care and reduce your speed. When operating in traffic always use
the Tractor’s flashing warning lights and reduce your speed. Be aware of traffic around you
and watch out for the other guy. (SG-19)
Be particularly careful when transporting the Implement using the tractor. Turn curves or
go up or down hills only at a low speed and at a gradual steering angle. Make certain that
at least 20% of the tractor’s weight is on the front wheels to maintain safe steerage. Slow
down on rough or uneven surfaces. (STI-01)
Only tow the Implement behind a properly sized and equipped Tractor
which exceeds the weight of the Implement by at least 20%. DO NOT
tow the Implement behind a truck or other type of vehicle. Never tow the
Implement and another Implement connected in tandem. Never tow the
Implement at speeds over 20 MPH. (STI-06)
PA91 03/09
Safety Section 1-13
© 2009 Alamo Group Inc.
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SAFETY
Your driving vision may be reduced or impaired by the tractor, cab, or implement. Before
driving on public roadways identify any limited vision areas, and make adjustments to your
operating position, mirrors, and the implement transport position so that you can clearly
see the area where you will be traveling, and any traffic that may approach you. Failure to
maintain adequate vision of the public roadway and traffic can result in serious injury or
even death. (STI-10)
Maintenance and Service Safety Instructions and Practices
Make sure the PTO shield, integral driveline shields, and input shields
are is installed when using PTO-driven equipment. Always replace any
shield if it is damaged or missing. (S3PT-8)
Relieve hydraulic pressure prior to doing any maintenance or repair work
on the Implement. Place the Implement on the ground or securely
blocked up, disengage the PTO, and turn off the tractor engine. Push
and pull the Remote Cylinder lever in and out several times prior to
starting any maintenance or repair work. (S3PT-09)
Always disconnect the main PTO Driveline from the Tractor before performing service on
the Implement. Never work on the Implement with the tractor PTO driveline connected and
running. Rotating Parts, Blades or Drivelines could turn without warning and cause immedi-
ate entanglement, injury or death. (S3PT-11)
Always maintain the safety signs in good readable condition. If the safety signs are missing,
damaged, or unreadable, obtain and install replacement safety signs immediately. (SG-5)
Do not modify or alter this Implement. Do not permit anyone to modify or alter this
Implement, any of its components or any Implement function. (SG-8)
Never work under the Implement, the framework, or any lifted
component unless the Implement is securely supported or blocked up
to prevent sudden or inadvertent falling which could cause serious
injury or even death. (SG-14)
Never attempt to lubricate, adjust, or remove material from the Implement while it is in
motion or while tractor engine is running. (SG-20)
PA91 03/09
Safety Section 1-14
© 2009 Alamo Group Inc.
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SAFETY
Periodically inspect all moving parts for wear and replace when
necessary with authorized service parts. Look for loose fasteners, worn
or broken parts, and leaky or loose fittings. Make sure all pins have
cotter pins and washers. Serious injury may occur from not maintaining
this machine in good working order. (SG-21)
Do Not fill fuel tank while engine is running. Refuel only after engine has cooled down. If
fuel is spilled, move machine away from the area of the spill and avoid creating any source
of ignition until the gasoline has evaporated. (SG-28)
Perform service, repairs and lubrication according to the maintenance section. Ensure the
unit is properly lubricated as specified in the lubrication schedule and all bolts and nuts are
properly torqued. Failure to properly service, repair and maintain this Implement in good
operating condition could cause component failure and possible serious injury or even
death. (SG-35)
Use caution and wear protective gloves when handling sharp objects such as blades,
knives, and other cutting edges. Be alert to worn component surfaces which have sharp
edges. Sharp surfaces can inflict severe laceration injuries if proper hand protection is not
worn. (SG-37)
All Safety Shields, Guards and Safety devices including (but not lim-
ited to) - the Deflectors, Chain Guards, Steel Guards, Gearbox
Shields, PTO integral shields, and Retractable Door Shields should
be used and maintained in good working condition. All safety
devices should be inspected carefully at least daily for missing or
broken components. Missing, broken, or worn items must be
replaced at once to reduce the possibility of injury or death from
thrown objects, entanglement, or blade contact. (SGM-3)
Replace bent or broken blades with new blades. NEVER ATTEMPT TO STRAIGHTEN,
WELD, OR WELD HARDFACING ON BLADES SINCE THIS WILL LIKELY CRACK OR
OTHERWISE DAMAGE THE BLADE WITH SUBSEQUENT FAILURE AND POSSIBLE
SERIOUS INJURY FROM THROWN BLADES. (SGM-10)
DO NOT weld or repair rotating mower components. Welds and other repairs may cause
severe vibration and/or component failure resulting in part being thrown from the mower
causing serious bodily injury. See your Authorized Dealer for proper repairs. (SGM-13)
PA91 03/09
© 2009 Alamo Group Inc.
Safety Section 1-15
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SAFETY
PARTS INFORMATION
Alamo Industrial mowers use balanced and matched system components for blade carriers, blades,
cuttershafts, knives, knife hangers, rollers, drivetrain components, and bearings. These parts are made and
tested to Alamo Industrial specifications. Non-genuine "will fit" parts do not consistently meet these
specifications. The use of “will fit” parts may reduce mower performance, void mower warranties, and present
a safety hazard. Use genuine Alamo Industrial mower parts for economy and safety. (SPRM-1)
SEE YOUR ALAMO DEALER
Be sure you have adequate knowledge of the property you will be working on. Take time to
make yourself aware of any area underground lines or cables. Contact with buried lines
or cable could result in serious injury or death. (STL-1)
In wet conditions where there is a likelihood of material collecting on the Implement, make
certain that this material is removed before traveling on public roadways. (STL-7)
Concluding Safety Instructions and Practices
In addition to the design and configuration of this Implement, including Safety Signs and Safety Equipment,
hazard control and accident prevention are dependent upon the awareness, concern, prudence, and proper
training of personnel involved in the operation, transport, maintenance, and storage of the machine. Refer
also to Safety Messages and operation instruction in each of the appropriate sections of the Tractor and
Equipment Manuals. Pay close attention to the Safety Signs affixed to the Tractor and Equipment. (SG-18)
PA91 03/09
Safety Section 1-16
© 2009 Alamo Group Inc.
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SAFETY
Decal Location
NOTE: Alamo Industrial supplies safety decals on this product to promote safe operation. Damage to the
decals may occur while in shipping, use, or reconditioning. Alamo Industrial cares about the safety of its
customers, operators, and bystanders, and will replace the safety decals on this product in the field, free of
charge (Some shipping and handling charges may apply). Contact your Alamo Industrial dealer to order
replacement decals.
PA91 03/09
Safety Section 1-17
© 2009 Alamo Group Inc.
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SAFETY
ITEM
PART NO.
QTY
LEVEL
DESCRIPTION
1.
2.
3.
4.
5.
6.
7.
8.
002369
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
1
3
1
1
1
1
1
1
2
2
1
1
2
1
1
1
1
2
1
1
3
3
1
DANGER
DANGER
DANGER
INSTRUCT
DANGER
DANGER
ATTENTION
NOTICE
Multiple Hazard Flail
Multiple Hazard Boom
Oil Leak/Penetration
Use Genuine Alamo Industrial Parts
Pinch Points/Scissors
Multiple Hazard/Crushing
Do not over speed engine
Operator’s Manual Shipped with Equipment
Operator’s Manual Inside
Pressurized Tank
Keep Away Thrown Objects
Rotating Driveline, Entanglement
Use/Repair Shields & Guards
Blades, Thrown Objects
Driveline Hazards
Boom Mower Multi-Hazard
Grease Fitting Inside
Flail Operating Instructions
Use Universal Hyd Oil
EP90 Oil in Speed Increaser
Spanish Warning
540 PTO
SMV Sign
Red
Amber
02958241
02965262
02965100
02962764
02962765
02965093
00763977
02977417
03200437
00769737
00756005
00756007
00756485
00756494
02958241
000678
9.
NOTICE
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
WARNING
DANGER
DANGER
DANGER
DANGER
DANGER
DANGER
INSTRUCT
INSTRUCT
INSTRUCT
INSTRUCT
PELIGRO
WARNING
REFLECT
REFLECT
REFLECT
PELIGRO
INSTRUCT
LOGO NAME
LOGO
000108
02966305
1290030
00725746
D103
03200347
1458392
1458393
00773723
02976881
001651
Rotating Driveline Translation
Mowing Safety Tips
Alamo Industrial
Alamo Industrial
Serial Plate
PA91 Operator’s Manual
AEM Mower Safety Manual
Bolt
Operator’s Manual Canister
Bolt
001650
NFS
SER PLT
7191852C
02977046
02153100
00776031
10058000
02919924
00024100
02982492
_________
_________
_________
_________
_________
_________
_________
_________
Locknut
Flatwasher
Bracket, Canister
NOTE: Alamo Industrial supplies safety decals on this product to promote safe operation. Damage to the
decals may occur while in shipping, use, or reconditioning. Alamo Industrial cares about the safety of its
customers, operators, and bystanders, and will replace the safety decals on this product in the field, free of
charge (some shipping and handling charges may apply). Contact your Alamo Industrial dealer to order
replacement decals.
PA91 03/09
Safety Section 1-18
© 2009 Alamo Group Inc.
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SAFETY
Decal Description
Danger! Mult-Hazard Warning. Failing to follow
these Safety Messages and Operating Instructions
can cause serious bodily injury or even death to
operator and others in the area.
P/N 002369
PA91 03/09
Safety Section 1-19
© 2009 Alamo Group Inc.
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SAFETY
DANGER! - Multi-Hazard Boom. Take precautions
while transporting and operating Boom Unit.
P/N 02958241
WARNING! Failure to INSPECT and REPAIR or
REPLACE Hoses may allow worn Hoses to rupture
SUDDENLY and VIOLENTLY with resulting serious
BODILY INJURY from SCALDING or FIRE with
resulting BURN INJURY or DEATH.
P/N 02965262
IMPORTANT - Use only Genuine Alamo Industrial
replacement parts.
P/N 02925100
WARNING! Pinch Points
P/N 02962764
PA91 03/09
Safety Section 1-20
© 2009 Alamo Group Inc.
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SAFETY
DANGER! Crushing and Pinch Points.
Moving machiney parts can pinch or crush or fall-
which may cause injury or death.
P/N 02962765
INFORMATION - To prevent premature hydraulic
component failure, do not over speed the engine.
When using the mower attachment, operate tractor
at the engine speed which will deliver 540 PTO
RPM on Tachometer. Over speeding the engine
and pump when operating the mower will overheat
and rapidly ruin the oil which will decrease the life
of the hydraulic components.
P/N 02965093
Operator's Manual (with repair parts) and warranty
was attached to this implement during final
inspection.
P/N 00763977
INSTRUCTIONS - Read Operator’s Manual and
Understand, before operating Tractor and Imple-
ment.
P/N 02977417
PA91 03/09
Safety Section 1-21
© 2009 Alamo Group Inc.
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SAFETY
WARNING: Pressurized Tank
03200437
DANGER! Keep Away Thrown Objects.
Inspect the area before mowing for potential mower
hazards. Remove or avoid all foreign objects such
as wire, cable, metal objects, and all other foreign
material.
Foreign material can be thrown from the mower
and cause serious bodily injury to the operator and
passerby.
Do Not let rotating blades contact solid objects like
rocks, posts, curbs or guard rails.
Operate only if all Guards, Deflectors are in place
and in good condition.
Do Not operate with Mower or Wing raised off the
ground.
Stop mowing if Passersby enter the area of thrown
objects. (See Operator’s Manual)
Stay away from rotating blades. Keep hands and
feet away from rotating blades.
Do Not approach mower until all motion has
stopped.
P/N 00769737
DANGER! Rotating Driveline Keep Away, Contact
can cause death.
P/N 00756005
PA91 03/09
Safety Section 1-22
© 2009 Alamo Group Inc.
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SAFETY
WARNING! Keep all safety shielding installed,
repaired and replaced when damaged so that
machine stays in safe condition.
P/N 00756007
DANGER! Keep Away - Rotating Blades
P/N 00756485
DANGER! Make certain that drivelines are correct
length and are securely attached.
P/N 00756494
DANGER! - Multi-Hazard Boom. Take precautions
while transporting and operating Boom Unit.
P/N 02958241
PA91 03/09
Safety Section 1-23
© 2009 Alamo Group Inc.
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SAFETY
Information that Grease Fitting is present and must
apply grease.
P/N 000678
Instructions to properly lubricate and check mower
for potential problems prior to operation.
P/N 000108
INFORMATION - Attention - Service Hydraulic
System with Universal Tractor Hydraulic Oil. Alamo
Group part Number 02966307.
02966305
Peligro Translation, If you do not know how to read
English, please find someone who knows how to
read English.
P/N 00725746
PA91 03/09
Safety Section 1-24
© 2009 Alamo Group Inc.
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SAFETY
WARNING! Avoid Bodily Injury, Use 540RPM PTO
Speed Only.
P/N D103
Slow Moving Vehicle Decal. Keep SMV reflector
clean and visible. DO NOT transport or operate
without the SMV.
P/N 03200347
Red Reflector. Keep reflectors clean and visible.
P/N 1458392
Amber Reflector. Keep reflectors clean and visible.
P/N 1458393
PA91 03/09
Safety Section 1-25
© 2009 Alamo Group Inc.
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SAFETY
PELIGRO! Spanish Translation for Driveline Safety
P/N 00773723
ALAMO INDUSTRIAL LOGO
P/N 001651
ALAMO NAME LOGO.
P/N 001650
Read Operator’s Manual! The operator’s manual is
located inside this canister. If the manual is
missing order one from your dealer.
P/N 00776031
PA91 03/09
Safety Section 1-26
© 2009 Alamo Group Inc.
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SAFETY
Federal Laws and Regulations
This section is intended to explain in broad terms the concept and effect of federal laws and regulations
concerning employer and employee equipment operators. This section is not intended as a legal
interpretation of the law and should not be considered as such.
Employer-Employee Operator Regulations
U.S. Public Law 91-596 (The Williams-Steiger Occupational and Health Act of 1970) OSHA
This Act Seeks:
“...to assure so far as possible every working man and woman in the nation safe and healthful working
conditions and to preserve our human resources...”
DUTIES
Sec. 5 (a) Each employer-
(1) shall furnish to each of his employees employment and a place of employment which are free from
recognized hazards that are causing or are likely to cause death or serious physical harm to his employees;
(2) shall comply with occupational safety and health standards promulgated under this Act.
(b) Each employee shall comply with occupational safety and health standards and all rules, regulations and
orders issued pursuant to this Act which are applicable to his own actions and conduct.
OSHA Regulations
OSHA regulations state in part: “At the time of initial assignment and at least annually thereafter, the employer
shall instruct every employee in the safe operation and servicing of all equipment with which the employee is,
or will be involved.”
Employer Responsibilities:
To ensure employee safety during Tractor and Implement operation, it is the employer’s responsibility to:
1. Train the employee in the proper and safe operation of the Tractor and Implement.
2. Require that the employee read and fully understand the Tractor and Implement Operator’s manual.
3. Permit only qualified and properly trained employees to operate the Tractor and Implement.
4. Maintain the Tractor and Implement in a safe operational condition and maintain all shields and guards on the
equipment.
5. Ensure the Tractor is equipped with a functional ROPS and seat belt and require that the employee operator
securely fasten the safety belt and operate with the ROPS in the raised position at all times.
6. Forbid the employee operator to carry additional riders on the Tractor or Implement.
7. Provide the required tools to maintain the Tractor and Implement in a good safe working condition and provide the
necessary support devices to secure the equipment safely while performing repairs and service.
8. Require that the employee operator stop operation if bystanders or passersby come within 25 feet.
Child Labor Under 16 Years of Age
Some regulations specify that no one under the age of 16 may operate power machinery. It is your
responsibility to know what these regulations are in your own area or situation. (Refer to U.S. Dept. of
PA91 03/09
Safety Section 1-27
© 2009 Alamo Group Inc.
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INTRODUCTION
This trimmer is designed with care and built with quality materials by skilled workers. Proper assembly,
maintenance, and operating practices, as described in this manual, will help the owner/ operator get years of
satisfactory service from the machine.
The purpose of this manual is to familiarize, and instruct. The Assembly Section instructs the owner/operator in
the correct assembly of the Mower using standard and optional equipment. The Parts Listing section is
designed to familiarize the owner/operator with replaceable parts on the Mower. This section provides
exploded assembly drawings of each mower component illustrating each piece and the corresponding part
number.
Careful use and timely service saves extensive repairs and costly downtime losses. The Operation and
Maintenance Sections of the manual train the owner/operator how to work the Mower correctly and attend to
appropriate maintenance. The Trouble Shooting Guide helps diagnose difficulties with mower and offers
solutions to the problems.
Safety is of primary importance to the owner/operator and to the manufacturer. The first section of this manual
includes a list of Safety Messages, that, if followed, will help protect the operator and bystanders from injury or
death. Many of the Safety Messages will be repeated throughout the manual. The owner/operator/dealer
should know these Safety Messages before assembly and be aware of the hazards of operating this mower
during assembly, use, and maintenance. The Safety Alert Symbol combined with a Signal Word, as seen
below, is intended to warn the owner/operator of impending hazards and the degree of possible injury faced
when operating this machine.
Indicates an imminently hazardous situation that, if not avoided, WILL result in DEATH OR
VERY SERIOUS INJURY.
Indicates an imminently hazardous situation that, if not avoided, COULD result in DEATH
OR SERIOUS INJURY.
Indicates an imminently hazardous situation that, if not avoided, MAY result in MINOR
INJURY.
Identifies special instructions or procedures that, if not strictly observed, could result in
damage to, or destruction of the machine, attachments or the environment.
PA91 03/09
Introduction Section 2-2
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INTRODUCTION
These hydraulically driven flail trimmers are designed for medium-duty work. They can mow pastures and
control grass and weeds on highways or industrial sites.
For Non-Agricultural use, OSHA, ASAE, SAE and ANSI standards require the use of Chain
Guards, Deflectors, or Solid Skirts at all times. The Mower manufacturer strongly
recommends the use of Chain Guards, Deflectors, or Solid Skirts for Agricultural purposes
as well to reduce the risk of property damage, serious bodily injury, or even death from
objects thrown out by or from contact with the Cutting Blades.
At least 20% of the tractor’s total weight must be on the front tires with the Mower lifted to
provide adequate traction for safe steering under good conditions. Slow down on hills, rough
terrain, and curves.
Mower Orientation: Front and rear, and left and right are determined by the normal direction of travel (the same
as on your automobile).
PA91 03/09
Introduction Section 2-3
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INTRODUCTION
ATTENTION OWNER/ OPERATOR
BEFORE OPERATING THIS MACHINE:
1. Carefully read the Operator’s Manual, completely understand the Safety Messages and instructions, and
know how to operate correctly both the Mower and Power Unit.
2. Fill out the Warranty Card in full. Be sure to answer all questions, including the Serial Number of the Mower.
Mail promptly using the return envelope included with the Operator’s Manual.
NOTE: Warranties are honored only if completed “Owner Registration and Warranty” forms are received by
Alamo Group within thirty days of delivery of the mower.
3. Record the Mower Model and Serial Numbers on the Warranty page at the end of the Operator’s Manual.
Keep this as part of the permanent maintenance file for the Mower.
PA91 03/09
Introduction Section 2-4
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ASSEMBLY
TRACTOR SELECTION
Horsepower and Weight Requirements
The Power Arm 91 requires a tractor with a minimum of 30 HP in conjunction with a minimum weight of
1500Kg (1.5 tons imp. 1.6 tons U.S.). If necessary, add ballast to achieve this weight. Check in the tractor’s
handbook that it does not exceed the maximum allowed.
Bear in mind that these are minimum requirements for optimum working conditions. Tractor selection must take
into account the type of terrain upon which it is proposed to operate and the degree of stability required.
Linkage Requirements
The tractor must be equipped with either CAT I or CAT II linkage.
Linkage Isolation
Although it may be possible to operate the semi-independent version of the PA91 without linkage isolation, a
severe strain would be put upon the attachment yoke and pins. Most modern tractors are equipped with a
ready means of providing linkage isolation through a conveniently operated valve.
Linkage isolation is not required on the fully independent model of the PA91 and the tractors hydraulic controls
should be neutralized.
Check Chains/ Stabilizers
To hold the machine firmly in position, check chains or stabilizer bars must be fitted. It is dangerous to operate
the machine without these elements.
Tractor Relief Valve
The main relief valve in the hedger hydraulic control unit is set at 1800 PSI (125 Bar). Therefore, if operating
the PA91 in semi-independent form, the tractor’s relief valve setting must be at least a little above 1800 PSI for
satisfactory operation.
Tractor Hydraulic Flow Rates
Oil flow rates are not crucial when operating a semi-independent PA91. Flow rates of up to 10 GPM (45 1/min.)
should not have any adverse to the inching response that it is sometimes required from the control valve.
P.T.O. Shaft
Tractor must be equipped with live drive-independent PTO shaft to enable forward movement to be halted
while the flail head continues to operate.
Draft Control
Loads imposed through the draft sensing mechanism will not normally be sufficient to put a strain on the
tractor. However, any provision for draft control should be set to minimum response. Where a draft control
rocker is fitted with a dead pin this should be utilized.
PA91 03/09
Assembly Section 3-2
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ASSEMBLY
TRACTOR PREPARATION
Fitting Operator Guard
A tractor fitted with a cab that has a safety glass windows should be used whenever possible. This is a basic
safety precaution applicable to the use of all flail-type hedge trimmers.
Power arms are supplied with an operator guard kit (Part No. 73 13 324) which must be fitted to the tractor
before commencing work.
It consists of two areas of wire mesh which can be shaped to suit and be secured against the cab window with
a spring loaded hooks; the upper edge being anchored around the cab gutter and the lower edge around the
mudwing.
According to the great range of cabs, it may be necessary to adapt or make brackets to secure the mesh.
If the flail is operated on a tractor that is equipped with a a safety frame or roll bar only, an additional frame
must be made and fixed to the tractor onto which the guard mesh can be secured. In addition to the guard
mesh, a sheet of Polycarbonate transparent glazing must be fitted to the frame to provide further operator
protection. This material must also be used when the cab does not have safety glass installed.
The operator guard kit supplied is suitable for all standard applications; i.e., rear mounted on a conventional
tractor. For other applications, additional mesh guarding may need to be constructed to give adequate operator
protection. A guideline to follow when assessing any additional guarding that may be required is that the
operator must always be looking at the flail head through the mesh when it is in any working position.
Polycarbonate transparent sheeting is an impact resistant material which can be readily sawed and shaped
according to requirements. Unfortunately, it is susceptible to surface damage and scratching. Therefore, it is
advisable to place the material on the inside of the window for protection. No attempt should be made to wipe
the sheeting with dirt ingrained cloth.
Toughened grades of polycarbonate sheeting are available under the brand names of “Makrolon”, “Tuffak” and
“Lexan”.
In case of difficulty in obtaining this material locally, contact F.W. McConnell Ltd. through your normal dealer.
PA91 03/09
Assembly Section 3-3
© 2009 Alamo Group Inc.
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ASSEMBLY
Ballast Weight
Tractor must be stable while operating the hedge cutters under all conditions. Pay attention when operating on
slopes. Front end ballast as well as rear wheel weights to counterbalance the overhang of the flail head should
be added as appropriate. On steeply banked ground, it may not be sufficient to depend alone on the
counterweight provided by the oil reservoir.
In addition, rear wheel track should be set as wide as possible to increase stability. It will also increase the
protection to the reservoir.
JOHN DEERE CONVERSION KIT (81- 30- 059)
The John Deere utilizes a “closed center” hydraulic principle and because of this, it is recommended to use
trimmers with a fully independent hydraulic system on tractors of this manufacture. However, it is practicable
for the semi independent model of the PA91 to be used with these. Tractors subject to certain modifications.
There are the following two alternatives.
1. A flow limiting valve manufactured by John Deere is available to provide an “open center” external supply
sufficient for PA91 requirements. For further advice consult your John Deere dealer.
2. Components are available from F.W. McConnel Ltd. to convert the standard “open center” valve. Part No.
81-30-059 consists of a relief valve blanking plug which should be installed in place of existing relief valve. Be
careful when extracting the relief valve not to damage the copper sealing washer as it is reused with the
blanking plug. In addition, a pressure gallery blanking plug is installed in place of the standard blanking plug at
the valve outlet end next to the lift ram gland connection.
When working in this mode, the tractor’s pressure control valve must not exceed 1800 PSI (125 Bar).
PA91 03/09
Assembly Section 3-4
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ASSEMBLY
DELIVERY
1. The machine is delivered in a partially dismantled condition. To make ready for attachment to the tractor it
will be necessary to select a hard level surface
2. Cut the banding straps and remove the attached articles.
3. Fill the reservoir to capacity with oil selected from the chart on Section 3-9 to increase the stability of the
machine.
4. Remove and discard the transport strap connecting the flail head to the frame and also the lift ram stop
strapped to the rod.
ATTACHMENT TO TRACTOR
Si Model
1. On Si model, drive the tractor up as closely as possible and connect the return and supply hoses to the
tractor. Fit suitable return connection to the tractor and connect the return hose before connecting the supply
hose to the tractors external services point with a suitable self seal coupling.
*With the aid of a crowbar prise the flail head sideways until there is sufficient clearance to allow the tractor to
be driven up and the draft links connected. Assistance will be needed to simultaneously select “Reach out” and
“Angle down” to allow the oil to flow while the arms are being moved.
As a safety precaution, to prevent the possibility of the flail head slipping sideways and the
arm collapsing on the fitter as the head is pried sideways, a loop of strong rope or wire with
sufficient slack to allow the required flail head movement should connect the frame and
dipper. This will then act as a stopper in the event of this happening. Leave in position until
attachment is complete.
2. Swing up the linkage plate and fix securely in position with the nut and bolt provided.
3. Adjust tractor drop arms to enable the draft links to lower within 15 ins (375 MM.) of the ground.
4. Remove the top link and machine yoke completely.
5. Reverse the tractor squarely to the front of the machine, engage draft link pins and secure.
6. Attach yoke to the top hitch position on the tractor ensuring the lug for the top link is uppermost.
7. Unlimber the machine controls from its storage position and fit into the tractor cab.
8. Install the top link between the yoke and upper hitch position on the machine. If necessary, fit Cat I sleeves
into the ball ends of the top link.
*Raise the machine on its three point linkage to the working height, i.e. when the PTO shaft and the gearbox
stub shaft are (as near as possible) in a straight line.
Do not operate quadrant lever of machine controls through the rear cab window while
standing on or amongst linkage components. Always seek assistance.
*Measure the PTO drive shaft length as shown in diagram below and subtract 1 inch (25 MM.).
PA91 03/09
Assembly Section 3-5
© 2009 Alamo Group Inc.
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ASSEMBLY
*This measurement which is the fully closed final length of the PTO drive shaft measured button to button
should be taken carefully before the PTO drive shaft is shortened to suit by cutting off both the driving and
driven members of the tube by an equal amount. Likewise, the plastic shield will similarly have to be cut. Take
heed if too much is cut, it cannot be stuck back on. Measure twice and cut once. Accurate measurement is
important on some close coupled tractors to ensure maximum engagement during operation.
9. Lower the machine to the ground and fit the PTO shaft in position. Ensure that the collar locking devices on
the PTO shaft are fully engaged. Wrap the torque chain around the tractor drawbar or any convenient point to
prevent the shaft guard from rotating.
10. Raise the machine to working height.
Ti Model
1. Check that the rotor control valve is in the STOP position.
2. With PTO engaged on Ti model or with tractor external services activated on Si model, select “Lift Down”.
This will level the frame and enable the lower yoke pins to be fitted. Select the hole which will, as near as
possible position the PTO shaft horizontally in line.
3. Lower the quadrant lever so that the machines weight is taken by the yoke.
4. Adjust the top link to bring the pillar upright.
*Remove the rope arrestor loop.
5. Carry out final adjustment of the tractor lift arm leveling box to bring the main frame horizontal. This should
be checked with the arms at approximately half reach with the flail head clear of the ground.
6. Tighten up the check chains or adjustable stabilizers to hold the machine rigid without side-sway.
7. Raise the parking feet in their sockets and secure in the transport position.
8. Carefully operate the machine through its full range of movement while checking that the hoses are not
strained, pinched, chaffed or kinked and that all movements are functioning correctly.
9. Assemble the front hood to the flail head.
10. Fold the machine into the transport position.
11. The machine is now ready to proceed to the work site.
PA91 03/09
Assembly Section 3-6
© 2009 Alamo Group Inc.
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ASSEMBLY
This procedure is for initial attachment only, for subsequent attachment paras marked * do not apply.
If it is required to mount the machine on a different tractor, bear in mind that the engagement of the PTO shaft
will alter. A safe minimum engagement between the two halves of the shaft is 6”. This dimension must be
checked before work is commenced.
PA91 03/09
Assembly Section 3-7
© 2009 Alamo Group Inc.
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ASSEMBLY
FITTING CONTROL UNIT IN CAB
The 3 lever control unit which is cable operated is mounted on an adjustable stalk that is attached to a seat
bracket which is of universal design for mounting in many models of tractor. The bracket is normally trapped
between the seat runners and their mounting base. It may sometimes be necessary to drill extra holes in the
seat bracket to find the ideal operator position.
On tractors other than quiet cab models, it is permissible to attach the control unit to the mudwing or the
cladding or the cab, observing the precaution that no structural member of the safety frame should be drilled.
For this purpose, the mounting stalk can be bent round in a “U” shape.
The control unit itself is bolted to an angled mounting bracket in either a transverse or longitudinal position thus
giving a variety of mounting position, which in conjunction with flexibility of the mounting pillar will enable a
satisfactory working position to be achieved.
Shown above is detail of alternative fitting of the mounting spigot. In deciding the final of the control box,
remember that tight bends in the cables will reduce their operational life. Do not exceed the minimum
acceptable bend radii of 8”.
The handles may be screwed into alternative holes in the levers to give an “in line” installation should it be
desirable.
PA91 03/09
Assembly Section 3-8
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ASSEMBLY
OIL REQUIREMENTS
Tank
The machine is delivered from the factory without oil. Fill the reservoir with a light hydraulic oil as
recommended in the chart until the oil level is approximately 2” below the top of the tank. The total capacity is
approximately 117 tires (25 gallons). Do not overfill. The oil must have anti-frothing characteristics suitable for
use in hydraulic systems.
Supplier
Cold or Temperature Climate
Hot Climate
Hy-spin AWS68
Castrol
Agricastrol hydraulic oil
Hy-spin AWS32
Shell
Mobil
Esso
Texaco
Gulf
Tellus 32
Tellus 68
D.T.E. 25
D.T.E. 26
Nuto “H” or “A” 32
Rando HD 32
Hydrasil 32
Nuto “H” or “A” 68
Rando HD 68
Hydrasil 32
B.P.
Energal HLP 32
Energal HLP 68
Silkolene Dove 68
Dalton
Silkolene Dove 32 or
Derwnet 32
Elf
Hydrelf 32
32
Hydrelf 68
ISO VG
SAE
68
20
10W
Gearbox
Check the gearbox oil level. On level ground, gearbox should be filled until oil is in visible level with the lip of
the filler plub aperture. Do not attempt to fill by removing the breather as the depth of tapped thread in the
casing is insufficient to allow repeated loosening and tightening of the breather plug at this point.
The gearbox capacity is 700 milliliters (1-1/4 pint), use EP 90 gear oil.
PA91 03/09
Assembly Section 3-9
© 2009 Alamo Group Inc.
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ASSEMBLY
RUNNING UP PROCEDURE
PA91 Ti
1. Ensure that the rotor control is in “STOP” position, start the tractor, engage PTO and allow the oil to
circulate for about 5 minutes without operation of the armhead control lever. This will allow all the oil to circulate
thoroughly through the return line filter.
2. Operate the armhead levers through their complete range ensuring that all movements are functioning
correctly.
3. Place the flail head at a safe attitude and move the rotor control to “ON” position. After initial fluctuation due
to priming, the rotor should settle to a steady speed. Increase PTO speed to approximately 360 RPM and run
for a further five minutes before engaging and stopping tractor.
Check the hose runs and observe that they are free from any pinching, chafing, straining or kinks. Recheck the
oil level in the tank and top up as necessary.
PA91 Si
1. Ensure PTO lever is in neutral position, and isolate tractor hydraulic linkage. Start the tractor and select
external service supply on the hydraulic controls. Allow the tractor to run for several minutes before attempting
to operate any of the machine control levers.
2. While operating, move the levers through their complete range ensuring that all movements are
functioning correctly.
3. Check the tractor rear axle oil level and top up if necessary.
4. Place the flail head at a safe attitude and bring tractor engine revolutions to 1000 RPM to avoid stalling
when the starting load is placed on the motor. Engage PTO and allow the rotor to run for several minutes. Do
not leave the tractor cab or allow anyone to approach the flail head at this time.
Do not allow the pump to continue working if the rotor does not turn. Overheating and
serious pump damage to the pump can be caused in a very short time.
5. After running up the machine, increase PTO speed to approximately 360 RPM. Run machine further for
five minutes before disengaging the PTO and stopping tractor. The reason for this running period under a no
load condition is to thoroughly circulate the oil in the reservoir through the return line filter.
6. Check the hose runs and observe that they are free from any pinching, chafing, straining or kinks. Recheck
the oil level in the tank and top up as necessary.
PA91 03/09
Assembly Section 3-10
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ASSEMBLY
REMOVAL FROM TRACTOR
1. Select a firm level site for parking the machine.
2. Lower the parking legs and secure.
3. Operate the hydraulic service to place the arms at 1/2 to 3/4 reach and with the flail head roller horizontal
and level with the bottom of the parking feet.
4. Disengage tractor PTO and remove.
5. Disconnect stabilizers bars or loosen check chains as applicable.
6. Unbolt the control unit from the mounting pillar, remove from tractor cab and stow in a suitable location
clear of the ground. On Si models only, the supply and return hoses must be disconnected from the tractor and
stowed with their ends covered and clear of the ground.
7. Raise the machine on the tractor’s linkage to take the weight off the yoke and remove the lower yoke bolts.
8. Lower the tractor draft links and place machine firmly on the ground.
9. Remove draft links and top link from the machine, drive tractor away and remove yoke. Blank off the end of
the return hose with plug or small plastic bag if a self-seal coupling is not fitted.
STORAGE
If machine is to be left standing for an extended period of time, lightly coat the exposed portions of the ram rods
with grease. Subsequently, this grease which becomes contaminated with dust and grit should be wiped off
before the rams are next moved.
If the machine has to be stored outside, tie a piece of tarpaulin or canvas over the control assembly. Do not use
a plastic fertilizer bag which could lead to rapid corrosion.
PA91 03/09
Assembly Section 3-11
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ASSEMBLY
PROPER TORQUE VALUES FOR FASTENERS
The chart lists the correct tightening torque for fasteners. When bolts are to be tightened or replaced, refer to
this chart to determine the grade of bolts and the proper torque except when specific torque values are
assigned in manual text.
RECOMMENDED TORQUE IN FOOT POUNDS UNLESS OTHERWISE STATED IN THE MANUAL*
NOTE: These values apply to fasteners as received from supplier, dry or when lubricated with normal engine
oil. They do not apply if special graphitized or molydisulphide greases or other extreme pressure lubricants are
used. This applies to both UNF fine and UNC coarse threads.
PA91 03/09
Assembly Section 3-12
© 2009 Alamo Group Inc.
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OPERATION
ALAMO INDUSTRIAL POWER ARM 91
OPERATING INSTRUCTIONS
Alamo Industrial Interstater flail mowers are manufactured with quality material by skilled workers. These
mowers are designed for cutting grass and small weeds. The mower is equipped with protective deflectors to
prevent objects being thrown from the mower by the blades, however, no shielding is 100% effective. All
shields, guards, and deflectors equipped on the mower must be maintained in good operational condition.
It is the operator’s responsibility to be knowledgeable of all potential operating hazards and to take every
reasonable precaution to ensure oneself, others, animals, and property are not injured or damaged by the
mower, tractor, or a thrown object. Do not operate the mower if passersby, pets, livestock, or property are
within 100 yards of the unit.
This section of the Operator’s Manual is designed to familiarize, instruct, and educate safe and proper mower
use to the operator. Pictures contained in this section are intended to be used as a visual aid to assist in
explaining the operation of a Interstater flail mower and are not specific to any model. Some pictures may show
shields removed for picture clarity. NEVER operate implement without all shields in place and in good
operational condition. The operator must be familiar with the mower and tractor and all associated safety
practices before operating the mower and tractor. Proper operation of the mower, as detailed in this manual,
will help ensure years of safe and satisfactory use of the mower.
IMPORTANT: To avoid mower damage, retorque all bolts after the first 10 hours of operation. Refer to the
Torque Chart at the end of the Maintenance Section to ensure bolts are properly tightened.
READ AND UNDERSTAND THE ENTIRE OPERATING INSTRUCTIONS AND SAFETY SECTION OF THIS
MANUAL AND THE TRACTOR MANUAL BEFORE ATTEMPTING TO USE THE TRACTOR AND
IMPLEMENT. If you do not understand any of the instructions, contact your nearest authorized dealer for a
full explanation. Pay close attention to all safety signs and safety messages contained in this manual and
those affixed to the implement and tractor. OPS-U- 0001
READ, UNDERSTAND, and FOLLOW the following Safety Messages. Serious injury or
death may occur unless care is taken to follow the warnings and instructions stated in the
Safety Messages. Always use good common sense to avoid hazards. (SG-2)
Si no lee ingles, pida ayuda a alguien que si lo lea para que le traduzca las
medidas de seguridad. (SG-3)
PA91 02/08
Operation Section 4-2
© 2009 Alamo Group Inc.
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OPERATION
1. Standard Equipment and Specifications
Standard Specifications
Welded Tubular Frame
CAT I or CAT II Three Point Hitch
24-Gallon Reservoir with 12 Micron Filtration
Self-Contained Hydraulics
Hydraulic Breakaway
3-Spool Valve with Work Port Reliefs
1-1/2” King Post
Inner Boom Arm Tubing: 4” x 4” x 3/16”
Outer Boom Arm Tubing: 4” x 4” x 1/4”
Boom Reach: Up - 12’10”, Out - 12’8”, Do n- 7’10”
Safety Cage (ROPS Units Only)
Weight Approx. 1,900 lbs (excluding cutting head)
Head Specifications
39” Flail Head with 20 Drop-Forged, Double-Edged Knives
11- Gauge Top Deck with 1/4” Side Skirts
3 - 1/16” x 5/16” Wall Cutter Shaft with 2 - 3/16” Bearings
Motor to Cutter Shaft is Direct Drive
Front & Rear Safety Deflectors
PA91 02/08
Operation Section 4-3
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OPERATION
2. OPERATOR REQUIREMENTS
Safe operation of the unit is the responsibility of a qualified operator. A qualified operator has read and
understands the implement and tractor Operator’s Manuals and is experienced in implement and tractor
operation and all associated safety practices. In addition to the safety messages contained in this manual,
safety signs are affixed to the implement and tractor. If any part of the operation and safe use of this
equipment is not completely understood, consult an authorized dealer for a complete explanation.
If the operator cannot read the manuals for themselves or does not completely understand the operation of the
equipment, it is the responsibility of the supervisor to read and explain the manuals, safety practices, and
operating instructions to the operator.
Safe operation of equipment requires that the operator wear approved Personal Protective Equipment (PPE)
for the job conditions when attaching, operating, servicing, and repairing the equipment. PPE is designed to
provide operator protection and includes the following safety wear:
PERSONAL PROTECTIVE EQUIPMENT (PPE)
•
Protective Eye Glasses, Goggles, or Face
Shield
•
•
•
•
•
•
Hard Hat
Steel Toe Safety Footwear
Gloves
Hearing Protection
Close Fitting Clothing
Respirator or Filter Mask (depends on
operating conditions) OPS-U- 0002
NEVER use drugs or alcohol immediately before or while operating the
Tractor and Implement. Drugs and alcohol will affect an operator’s
alertness and coordination and therefore affect the operator’s ability to
operate the equipment safely. Before operating the Tractor or
Implement, an operator on prescription or over-the-counter medication
must consult a medical professional regarding any side effects of the
medication that would hinder their ability to operate the Equipment safely.
NEVER knowingly allow anyone to operate this equipment when their
alertness or coordination is impaired. Serious injury or death to the
operator or others could result if the operator is under the influence of
drugs or alcohol. (SG-27)
PA91 02/08
Operation Section 4-4
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OPERATION
3. TRACTOR REQUIREMENTS
In addition to tractor horsepower and size required to operate the mower unit, the tractor must also be properly
equipped to provide operator protection, to alert approaching vehicle drivers of the tractor’s presence, and to
ensure tractor stability when mowing with the boom fully extended.
Tractor Requirements and Capabilities
•
•
•
•
•
•
•
ASAE approved Roll-Over Protective Structure (ROPS) or ROPS cab and seat belt.
Tractor Safety Devices .....................Slow Moving Vehicle (SMV) emblem, lighting, PTO master shield
Tractor Horsepower-Minimum..........35 - 55 hp
Tractor Weight..................................1500 KG
Hitch .................................................Three-point Hitch
Hydraulics.........................................Fully independent or Semi-independent hydraulic system
Power Take Off.................................540 RPM
3.1 ROPS and Seat Belt
The tractor must be equipped with a Roll-Over-Protective-Structure (ROPS) (tractor cab or roll-bar) and seat
belt to protect the operator from falling off the tractor, especially during a roll over where the driver could be
crushed and killed. Only operate the tractor with the ROPS in the raised position and seat belt fastened.
Tractor model not equipped with a ROPS and seat belt should have these life saving features installed by an
authorized dealer. OPS-U- 0003
Operate this Equipment only with a Tractor equipped with an approved roll-
over-protective system (ROPS). Always wear seat belts. Serious injury or
even death could result from falling off the tractor--particularly during a turnover
when the operator could be pinned under the ROPS. (SG-7)
3.2 Operator Thrown Object Protection
The tractor must be equipped with protective
equipment to shield the operator from falling and
thrown objects. For cab tractors, the tractor must
be equipped with an operator safety screen on its
right side or the right side windows must be fitted
with a shatter proof safety window. For non-cab
tractors, the tractor must be equipped with a
ROPS and operator protective safety cage that
provides protection to the right and above the
operator seat. DO NOT remove the ROPS from
non-cab tractors to equip a safety cage.
OPS-B- 0001_A
PA91 02/08
Operation Section 4-5
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OPERATION
Never operate the Tractor and Mower Unit without an OPS (Operators
Protective Structure) or Cab to prevent injury from objects thrown from
ground or from overhead trimming.
passersby are with in 100 yards. (SBM-9)
Stop mowing if workers or
3.3 Tractor Lighting and SMV Emblem
If the tractor will be operated near or traveled on a
public roadway it must be equipped with proper
warning lighting and a Slow Moving Vehicle (SMV)
emblem which are clearly visible from the rear of
the unit. Most tractor’s have different settings for
operating and transporting lighting. Refer to the
tractor operator’s manual for using the tractor’s
light switch and operating the turn signals.
OPS-B- 0017
PA91 02/08
Operation Section 4-6
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OPERATION
3.4 Tractor Ballast
To ensure tractor stability when operating on flat surfaces the left rear tractor tire MUST exert a minimum
down force (weight) of 1500 lbs. on the ground when the tractor is on level ground, its boom is fully extended
and the mower head is horizontal and two feet above the ground. For units which have the ability to operate
on either side of the tractor, these requirements must also be met for the right side tire when the boom is
extended to the left side as described above. A tractor that does not meet this criteria is DANGEROUS and
should not be operated as upset of the unit can occur resulting in possible serious injury and property
damage. NOTE: All factory mounted units are tested and meet the ballast requirement before shipment;
further testing is not required unless the unit is operated in a manner other than what is considered standard
operating conditions.
For additional information on properly ballasting the tractor, refer to Alamo Industrial Tractor and Mower
Stability Pamphlet P/N #02959010
If the unit is operated on slopes greater than 5°,
additional counterweight will be required.
Operation of the unit on slopes greater than 11
percent (6.4 degrees) is not recommended under
any circumstances. On a tractor with a 96” outside
to outside tire spread, an 11 percent (6.4 degrees)
slope occurs when one rear tractor tire is about 8”
lower than the other rear tire. OPS-B- 0018
3.5 Tractor Safety Devices
If transporting or operating the tractor and implement near a public roadway, the tractor must be equipped with
proper warning lighting and a Slow Moving Vehicle (SMV) emblem which are clearly visible from the rear of
the unit. Lights and a SMV emblem must be equipped directly on implements if the visibility of the tractor
warning signals are obscured.
Maintain all manufacturer equipped safety shields and guards. Always replace shields and guards that were
removed for access to connect, service, or repair the tractor or implement. Never operate the tractor PTO
with the PTO master shield missing or in the raised position. OPS-U- 0004
3.6 Tractor Horsepower
The horsepower required to operate the mower depends on many factors including vegetation to be cut, terrain
condition, operator experience, and condition of the mower and tractor. For most mowing condition, the PA91
flail trimmer requires a tractor with at least 65 HP. Operating the mower with a tractor that does not have
adequate power may damage the tractor engine.
PA91 02/08
Operation Section 4-7
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OPERATION
3.7 3-Point Hitch
PA91 boom mowers can attach to tractors with
either a CAT I or II hitch. Refer to the tractor
operator’s manual for the category of the tractor
used. If the hitch does not conform to ASAE Cat I
or II dimensions, the mower may not fit or raise
properly. Consult an authorized dealer for possible
modification procedures to mount nonconforming
hitches.
Use the correct hitch pins for the hitch category
being used. For a Cat I hitch, 7/8” lower and 3/4”
upper diameter hitch pins are used and Cat II
hitches require 1-1/8” lower and 1” upper diameter
hitch pins.
CAT I Implement / Hitch Specification
CAT II Implement/ Hitch Specification
Width from outside to outside A-frame......26 7/8”
Quick Hitch width inside lug to lug ...........27 1/8”
Height from bottom hitch pin to top pin...........18”
Lower pin diameter ........................................7/8”
Upper pin diameter .......................................3/4”
Lynch pin diameter ....................................15/32”
Width from outside to outside A-frame ...... 32-3/8”
Quick Hitch width inside lug to lug............. 33-5/8”
Height from bottom hitch pin to top pin.............19”
Lower pin diameter.................................... 1-1/18”
Upper pin diameter.............................................1”
Lynch pin diameter......................................15/32”
3.8 Hydraulics
The PA91 is available with either a Semi or Totally Independent hydraulic system complete with rotor rotation
control. The semi-independent system takes its power from the tractor external hydraulic supply while the fully
independent system is operated by an extra lever on the control console, which allows selection of rotor
rotation.
3.9 Front End Weight
A minimum of 20% total tractor weight must be maintained on the tractor front end at all times. Front end
weight is critical to maintain steering control and to prevent the tractor from rearing up while driving. If the
front end is too light, add weight until a minimum of 20% total weight is reached on the front tires. Front
weights and weight carriers can be purchased through an authorized tractor dealership. OPS-U- 0005
PA91 02/08
Operation Section 4-8
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OPERATION
3.10 Power Take Off (PTO)
Depending on the unit, the mower is designed to operate at a PTO speed of 540 or 1000 RPM. Most tractors
operate at either 540, or a combination of 540 and 1000 RPM PTO speeds. The operating speed of the
mower and tractor can be determined by the number of splines on the driveline yoke and PTO output shaft.
Those operating at 540 RPM will have a 6-spline shaft and those operating at 1000 RPM will have a 21-spline
shaft or a 1-3/4” 20 spline shaft. Refer to the tractor owner’s manual for instructions to change PTO speeds on
models that operate at more than one speed.
If operating an older model tractor where the tractor’s transmission and PTO utilize one master clutch, an
over-running clutch must be used between the PTO output shaft and the driveline of the mower. An
authorized tractor dealer can provide the over-running clutch and its installation if needed. OPS-U- 0006
DO NOT use a PTO adapter to attach a non-matching Implement driveline to a Tractor
PTO. Use of an adapter can double the operating speed of the Implement resulting in
excessive vibration, thrown objects, and blade and implement failure. Adapter use will also
change the working length of the driveline exposing unshielded driveline areas. Serious
bodily injury and/or equipment failure can result from using a PTO adapter. Consult an
authorized dealer for assistance if the Implement driveline does not match the Tractor PTO.
(S3PT-14)
Never operate the Tractor and Mower if the Implement input driveline is directly connected
to the Tractor transmission. Tractor braking distances can be substantially increased by
the momentum of the rotating Mower blades driving the Tractor transmission even though
the Tractor clutch has been disengaged. Install an over running clutch between the Tractor
PTO and the Mower driveline to prevent this potentially dangerous situation. (S3PT-16)
4. GETTING ON AND OFF THE TRACTOR
Before getting onto the tractor, the operator must read and completely understand the implement and tractor
operator manuals. If any part of either manual is not completely understood, consult an authorized dealer for
a complete explanation. OPS-U- 0007
Do not mount or dismount the Tractor while the tractor is moving. Mount
the Tractor only when the Tractor and all moving parts are completely
stopped. (SG-12)
PA91 02/08
Operation Section 4-9
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OPERATION
4.1 Boarding the Tractor
Use both hands and equipped handrails and steps for support when boarding the tractor. Never use control
levers for support when mounting the tractor. Seat yourself in the operator’s seat and secure the seat belt
around you.
Never allow passengers to ride on the tractor or attached equipment. Riders can easily fall off and be
seriously injured or killed from falling off and being ran over. It is the operator’s responsibility to forbid all extra
riders at all times. OPS-U- 0008
Never allow children or other persons to ride on the Tractor or Implement.
Falling off can result in serious injury or death. (SG-10)
Never allow children to operate or ride on the Power Unit or Implement.
(SPU-17)
4.2 Dismounting the Tractor
Before dismounting, park the tractor and implement on a reasonably level surface, apply the parking brake,
idle the engine down, disengage the PTO, and lower the implement to the ground. Shut down the tractor
engine according to the operator’s manual, remove the key, and wait for all motion to completely stop. Never
leave the seat until the tractor, its engine and all moving parts have come to a complete stop.
Use hand rails and steps when exiting the tractor. Be careful of your step and use extra caution when mud,
ice, snow or other matter has accumulated on the steps or hand rails. Use all handrails and steps for support
and never rush or jump off the tractor. OPS-U- 0009
BEFORE leaving the tractor seat, always engage the brake and/or set
the tractor transmission in parking gear, disengage the PTO, stop the
engine, remove the key, and wait for all moving parts to stop. Place the
tractor shift lever into a low range or parking gear to prevent the tractor
from rolling. Never dismount a Tractor that is moving or while the engine
is running. Operate the Tractor controls from the tractor seat only. (SG-9)
PA91 02/08
Operation Section 4-10
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OPERATION
5. STARTING THE TRACTOR
The operator must have a complete understanding of the placement, function, and operational use of all
tractor controls before starting the tractor. Review the tractor operator’s manual and consult an authorized
dealer for tractor operation instructions if needed.
Essential Tractor Controls:
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•
•
Locate the ignition key/switch
Locate the engine shut off control
Locate the hydraulic control levers
Locate the light control lever
Locate the brake pedals and clutch
Locate the PTO control
Locate the 3 point hitch control lever
Locate the boom operating controls (joystick or valve bank)
Before starting the tractor ensure the following:
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•
•
•
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•
Conduct all pre-start operation inspection and service according to the tractor operator’s manual.
Make sure all guards, shields, and other safety devices are securely in place.
The parking brake is on.
The tractor transmission levers are in park or neutral.
The boom operating controls are in the neutral and off position.
The PTO control lever is disengaged.
The hydraulic remote control levers are in the neutral position.
Refer to the tractor owner’s manual for tractor starting procedures. Only start the tractor while seated and
belted in the tractor operator’s seat. Never bypass the ignition switch by short circuiting the starter solenoid.
After the tractor engine is running, avoid accidental contact with the tractor transmission to prevent sudden
and unexpected tractor movement. OPS-B- 0003
Never run the Tractor engine in a closed building or without adequate ventilation. The
exhaust fumes can be hazardous to your health. (SG-23)
Start tractor only when properly seated in the Tractor seat. Starting a
tractor in gear can result in injury or death. Read the Tractor operators
manual for proper starting instructions. (SG-13)
PA91 02/08
Operation Section 4-11
© 2009 Alamo Group Inc.
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