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FN20/FN14
NITRO
FLEX-WING MECHANICAL LEVEL
LIFT ROTARY MOWER
Published 02/10

Part NO. 00778645C

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. C01Cover

RHINO

1020 S. Sangamon Ave.
Gibson City, IL 60936
800-446-5158
Email: parts@servis-rhino.com
©2010 Alamo Group Inc.

$0.00

To the Owner/Operator/Dealer
All implements with moving parts are potentially hazardous. There is no substitute for a cautious, safe-minded
operator who recognizes the potential hazards and follows reasonable safety practices. The manufacturer has
designed this implement to be used with all its safety equipment properly attached to minimize the chance of
accidents.
BEFORE YOU START!! Read the safety messages on the implement and shown in your manual. Observe the
rules of safety and common sense!

WARRANTY INFORMATION:
Read and understand the complete Warranty Statement found in this Manual. Fill out the Warranty Registration
Form in full and return it to within 30 Days. Make certain the Serial Number of the Machine is recorded on the
Warranty Card and on the Warranty Form that you retain.

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
Storage and Parking Safety Instructions and Practices .................................................................................. 1-16
Concluding Safety Instructions and Practices................................................................................................. 1-16
Decal Location ................................................................................................................................................ 1-17
Decal Description ............................................................................................................................................ 1-19
Federal Laws and Regulations ....................................................................................................................... 1-28

INTRODUCTION SECTION ........................................................................... 2-1
ASSEMBLY SECTION................................................................................... 3-1
DEALER SET-UP INSTRUCTIONS..................................................................................................................
ASSEMBLY.......................................................................................................................................................
CONNECTING DRIVELINE ..............................................................................................................................
DRIVELINE ATTACHMENT .............................................................................................................................
TIRES AND WHEELS.......................................................................................................................................

3-2
3-2
3-5
3-6
3-7

OPERATION SECTION ................................................................................. 4-1
Standard Equipment and Specifications ........................................................................................................... 4-3
OPERATOR REQUIREMENTS ........................................................................................................................ 4-4
TRACTOR REQUIREMENTS........................................................................................................................... 4-5
ROPS and Seat Belt ......................................................................................................................................... 4-5
Tractor Safety Devices...................................................................................................................................... 4-6
Tractor Horsepower .......................................................................................................................................... 4-6
Tractor Hydraulics ............................................................................................................................................. 4-6
Front End Weight .............................................................................................................................................. 4-7
Power Take Off (PTO) ...................................................................................................................................... 4-7
GETTING ON AND OFF THE TRACTOR ........................................................................................................ 4-7
Boarding the Tractor ......................................................................................................................................... 4-8
Dismounting the Tractor.................................................................................................................................... 4-8
STARTING THE TRACTOR ............................................................................................................................. 4-9
CONNECTING THE MOWER TO THE TRACTOR .......................................................................................... 4-9
Connecting the Mower Tongue to the Tractor ................................................................................................ 4-10
Connecting Mower Hydraulic Lines to the Tractor .......................................................................................... 4-11
SETTING THE MOWER ................................................................................................................................. 4-12
Setting Deck Height ........................................................................................................................................ 4-12
Setting Deck Pitch........................................................................................................................................... 4-13
Lowest Cutting Height ..................................................................................................................................... 4-14
DRIVELINE ATTACHMENT ........................................................................................................................... 4-15
Constant Velocity (CV) Driveline..................................................................................................................... 4-17
PRE-OPERATION INSPECTION AND SERVICE .......................................................................................... 4-18
Tractor Pre-Operation Inspection/Service....................................................................................................... 4-19
Mower Pre-Operation Inspection/Service ....................................................................................................... 4-19
Cutting Component Inspection........................................................................................................................ 4-23
Blade Bolt Inspection ...................................................................................................................................... 4-25
DRIVING THE TRACTOR AND IMPLEMENT ................................................................................................ 4-28
Starting the Tractor ......................................................................................................................................... 4-29

Brake and Differential Lock Setting.................................................................................................................
Operating the Mower Wings ...........................................................................................................................
Transport Position ...........................................................................................................................................
Operating Position ..........................................................................................................................................
Driving the Tractor and Cutter.........................................................................................................................
Crossing Ditches and Steep Inclines ..............................................................................................................
OPERATING THE TRACTOR AND IMPLEMENT..........................................................................................
Foreign Debris Hazards ..................................................................................................................................
Bystanders/Passersby Precautions ................................................................................................................
Engaging the Power Take Off (PTO) ..............................................................................................................
PTO RPM and Ground Speed ........................................................................................................................
Operating the Mower ......................................................................................................................................
Shutting Down the Implement .........................................................................................................................
DISCONNECTING THE MOWER FROM THE TRACTOR ............................................................................
MOWER STORAGE .......................................................................................................................................
TRANSPORTING THE TRACTOR AND IMPLEMENT ..................................................................................
Tire and Wheels ..............................................................................................................................................
Transporting on Public Roadways ..................................................................................................................
Hauling the Tractor and Implement.................................................................................................................
TROUBLE SHOOTING GUIDE ......................................................................................................................

4-29
4-29
4-30
4-30
4-31
4-32
4-33
4-34
4-34
4-35
4-36
4-36
4-40
4-40
4-42
4-42
4-44
4-45
4-47
4-48

MAINTENANCE SECTION ............................................................................ 5-1
Lubrication ........................................................................................................................................................ 5-2
Tongue .............................................................................................................................................................. 5-4
CENTER & WING GEARBOXES ..................................................................................................................... 5-4
DIVIDER GEARBOX......................................................................................................................................... 5-5
DRIVELINES..................................................................................................................................................... 5-6
MAIN CV DRIVELINE SHIELD SERVICE INSTRUCTIONS ............................................................................ 5-7
TO DISASSEMBLE UNIVERSAL JOINT .......................................................................................................... 5-8
TO REASSEMBLE UNIVERSAL JOINT ........................................................................................................... 5-9
DISASSEMBLY - CROSS AND BEARING KIT .............................................................................................. 5-11
INSPECTION .................................................................................................................................................. 5-13
ASSEMBLY..................................................................................................................................................... 5-14
BLADE SERVICING ....................................................................................................................................... 5-17
BLADE SHARPENING ................................................................................................................................... 5-18
BLADE REMOVAL.......................................................................................................................................... 5-18
BLADE CARRIER INSPECTION .................................................................................................................... 5-19
BLADE CARRIER INSTALLATION ................................................................................................................ 5-20
TORQUE LIMITER ......................................................................................................................................... 5-20
SEASONAL TORQUE LIMITER MAINTENANCE .......................................................................................... 5-20
TORQUE LIMITER REPAIR PROCEDURE ................................................................................................... 5-21
GEARBOX ARRANGEMENTS (Secondary Gearboxes)................................................................................ 5-23
HYDRAULIC HOSES...................................................................................................................................... 5-24
SKID SHOES .................................................................................................................................................. 5-24
HARDWARE ................................................................................................................................................... 5-24
PROPER TORQUE FOR FASTENERS ......................................................................................................... 5-25

In order to reduce accidents and enhance the safe operation of mowers, Alamo Group Ag Division, 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
operation of their mowing equipment and be able to recognize the potential hazards that can occur while
operating 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 RhinoDealer 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 Group Ag.
If you would like a VHS video tape of the video, please email AEMVideo@alamo-group.com 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.

Alamo Group Ag. 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

Requester Name

Phone:

Requester Address:
City
State
Zip Code
Mower Model:

Serial Number:

Date Purchased:

Dealer Salesperson:

Dealership Name:

Dealership Location:

Mail to:
AEM Video Services
1502 E. Walnut street
Seguin, TX 78155

Or Fax to:
(830) 372-9529
Or Email to:
AEMVideo@alamo-group.com

SAFETY SECTION

Safety Section 1-1
© 2010 Alamo Group Inc.

SAFETY
General Safety Instructions and Practices

SAFETY

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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-2

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)

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
completely understand this Manual, the Tractor Operator’s Manual, and
each of the Safety Messages found in the Manual or on the Tractor and
Implement. Learn how to stop the tractor engine suddenly in an
emergency.
Never allow inexperienced or untrained personnel to
operate the Tractor or 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)

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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-3

SAFETY

Operator Safety Instructions and Practices

SAFETY
Always read carefully and comply fully with the manufacturer’s
instructions when handling oil, solvents, cleansers, and any other
chemical agent. (SG-22)

SAFETY

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. 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)

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)
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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-4

SAFETY
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)

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)
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 may be 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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-5

SAFETY

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)

SAFETY

Do not operate Mower if excessive vibration exists.
Shut down PTO and the Tractor
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
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 rollover-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 set the parking 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)

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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-6

SAFETY
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)

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)

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
300 feet (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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-7

SAFETY

Never run the Tractor engine in a closed building or without adequate ventilation. The
exhaust fumes can be hazardous to your health. (SG-23)

SAFETY

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 300 feet
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)
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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-8

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)

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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-9

SAFETY

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 nonvegetative 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)

SAFETY

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 attempt to raise or lower the implement wing unless the Implement tongue is
securely attached to the Tractor drawbar. The Implement could tip over and cause
equipment damage and possible serious injury or death. Raise or Lower the mower wing
only while seated in the Tractor operator’s seat with the seat belt securely fastened. (SRM-2)
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)
DO NOT allow any person under a folded wing unless wing is securely
locked up or supported. DO NOT approach the Implement unless the
Tractor is turned off and all motion has ceased. Never work under the
frame work, or any lifted component unless the implement is securely
supported or blocked up. A sudden or inadvertent fall by any of these
components could cause serious injury or even death. (STI-03)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-10

SAFETY
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)

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)
Never unhitch without using the Tongue Jack. The Tongue is very heavy. Attempting to lift
the Tongue without using the Tongue Jack could cause strains or other injury. Allowing the
tongue to fall suddenly and unexpectedly could result in crushing injury. Use the Tongue
Jack for lifting the Implement only. Overloading the Tongue Jack can cause failure with
possible serious bodily injury or even death. (STI-04)
On a fully-assembled unit, do not remove the Wing Retaining Strap until hoses are attached
to the tractor and the Wing Cylinders are filled with oil. Lower the Wings slowly and
carefully. Keep bystanders away during operations. (STI-05)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-11

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)

SAFETY
Transporting Safety Instructions and Practices

SAFETY

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)
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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-12

SAFETY
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 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)
When the Wings are folded for transport, the center of gravity is raised and the possibility of
overturn is increased. Drive slowly and use extreme caution when turning on hillsides.
Overturning the Implement could cause the Implement to overturn the Tractor and vice
versa resulting in serious injury or even death. Never fold wings on a hillside...the
Implement may overturn. (STI-02)
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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-13

SAFETY

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.

SAFETY
Secure the Implement for transport before traveling on public roads. For pull-type
Implements, secure the center axle using cylinder stops or transport pin and properly attach
a safety chain between the Implement and Tractor. Secure wings in upright position on
folding Implements using wing transport locks. (STI-7)

SAFETY

Always keep a careful lookout and use extreme care when working
around overhead obstructions and electrical power lines.
The
Implement wing can be over 10 feet high. Never allow the Implement
wing to come within 10 feet of any power line. (STI-8)
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 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
immediate entanglement, injury or death. (S3PT-11)
Never interfere with factory-set hydraulic calibrations. Any change in calibration could
cause a failure of the equipment and may result in injury. (SBH-13)
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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-14

SAFETY
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)

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
limited 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 POSSIBLY
CAUSE 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)
FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-15

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)

SAFETY

PARTS INFORMATION
Rhino 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 Rhino
specifications. Non-genuine "will fit" parts do not consistently meet these specifications. The use of “will fit”
parts may reduce mower performance, void warranties, and present a safety hazard. Use genuine Rhino
mower parts for economy and safety. (SPRM-1)
SEE YOUR RHINO 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)

Storage and Parking Safety Instructions and Practices
To prevent tipping of Implement when stored in folded position, use carrying wheels or
adequate stands on center frame. (S3PT-6)

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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-16

SAFETY
Decal Location
NOTE: Rhino supplies safety decals on this product to promote safe operation. Damage to the decals may
occur while in shipping, use, or reconditioning. Rhino 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 Rhino dealer to order replacement decals

SAFETY

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-17

SAFETY

SAFETY
ITEM

PART NO.

QTY

TYPE

DESCRIPTION

1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

D389
D388
D390
D417
00753840
D401
999403
00760657
00756004

1
1
1
3(2)
3(1)
1
0(1)
1
4(3)
[2]
[2]
[1]
[1]
2
2
1
2
1(0)
1
1
2(1)
2
2
1
2
1
1
1
3
6
3
6**
1
1
2
(2) 1

DECAL
DECAL
DECAL
IMPORTANT
DANGER
INSTRUCT
DANGER
IMPORTANT
DANGER
MODEL NAME
MODEL NAME
MODEL NAME
MODEL NAME
LOGO NAME
LOGO NAME
SER PLATE
INSTRUCT
INSTRUCT
INSTRUCT
INSTRUCT
NAME
LOGO
LOGO NAME
REFLECT
REFLECT
REFLECT

Lift Unit Decal Sheet
Driveline Hazards
Pull Type Units
Replace Blades in Pairs
Folding Wing Thrown Objects
1000 RPM (Not Shown)
Overturn of Two Section Flex
Genuine Parts
Shield Missing
Flex 20 NITRO (Large)
Flex 14 NITRO (Large)
Flex 20 NITRO (Small)
Flex 14 NITRO (Small)
NITRO (Small)
NITRO (Large)
Serial Number Plate
CCW Blade Rotation
CW Blade Rotation
5 Yr. Gearbox Warranty
2 Yr. Driveline Warranty
Rhino 2.8” x 10”
Rhino 4.2” x 6.6”
Rhino Type 4.3” x 20”
SMV
Red Reflector
Amber Reflector
Canister, Operator’s Manual
Operator’s Manual
Bolt
Flatwasher
Locknut
Explosion Hazard
Jack Positioning
Transport Latch
Crushing Hazard - Falling
Crushing Hazard - Lock

10A.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.

D558
D557
nfs
D137
D138
00771283
00771284
99102
D302
D303
03200347
1458392
1458393
00776031
00778645C
10058000
00024100
02959924
1006348
D482
D520
D519
D539

WARNING
WARNING
IMPORTANT
DANGER
DANGER

Decal Sheets
Flex Wing D420
Single Wing D422
Logo D407
** Provided by Wheel Assembly Supplier
( ) For Two-Section Unit Only
[ ] Use one or the other

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-18

SAFETY
Decal Description
Multi Hazard Decal Sheet

Decal D389 consists of the following multi-hazards.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-19

SAFETY

P/N D389

SAFETY
Driveline Hazards

SAFETY

P/N D388
Decal D388 consists of the following multi-hazards.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-20

SAFETY
Multi Hazard Decal Sheet

P/N D390

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-21

SAFETY

Decal D390 consists of the following multi-hazards.

SAFETY

IMPORTANT! Always replace blades in pairs.

P/N D417
DANGER!
wings.

Stay clear when lowering or raising

P/N 00753840
1000 RPM

P/N D401
DANGER! Keep everyone clear when lifting,
folding, and working under raised components.
Block securely before working under mower. Install
Weight Box and Weight (Min. of 700lbs) before
operating to prevent turning over the center section
which can cause SERIOUS BODILY INJURY or
DEATH. Without weight, Do not fold wing. Attach
transport strap securely to prevent inadvertent
dropping from the transport position and possible
CRUSHING INJURY OR DEATH.
P/N 999403

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-22

SAFETY
For safety and to guarantee optimum product
reliability always use genuine RHINO replacement
parts.

P/N 00760657

P/N 00756004
NAME LOGO: NITRO

P/N D558
NAME LOGO: NITRO

P/N D557

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-23

SAFETY

DANGER! Guard Missing, Do Not Operate. If you
see this decal, Do Not Operate the mower until the
shield has been replaced.

SAFETY

Blade Rotation Counter Clockwise.

P/N D137
Blade Rotation Clockwise.

P/N D138
INFORMATION - 5 Year Gearbox Warranty

P/N 00771283

INFORMATION - 2 Year Driveline Warranty

P/N 00771284

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-24

SAFETY
Logo Product Name: Rhino

SAFETY

P/N 99102
Logo Product Name: Rhino

P/N D302
Logo Product Name: Rhino

P/N D303
Slow Moving Vehicle Decal. Keep SMV reflector
clean and visible. DO NOT transport or operate
without the SMV.

P/N 03200347

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-25

SAFETY

Red Reflector. Keep reflectors clean and visible.

P/N 1458392
Amber Reflector. Keep reflectors clean and visible.

P/N 1458393
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
WARNING! Explosion Hazard - Release all air
pressure in tire before loosening bolts.

P/N 1006348

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-26

SAFETY
WARNING! Jack - Maximum Capacity 3,200 lbs.
Side Load 2,000 lbs.

IMPORTANT! Transport Latch - Lower and lock
before transporting mower roadway.

P/N D520
DANGER! Crushing Hazard - Falling Wings

P/N D519
DANGER! Crushing Hazard - Transport Latch

P/N D539

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-27

SAFETY

P/N D482

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...”

SAFETY

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.

Require that the employee read and fully understand the Tractor and Implement Operator’s manual.

Permit only qualified and properly trained employees to operate the Tractor and Implement.

Maintain the Tractor and Implement in a safe operational condition and maintain all shields and guards on the
equipment.

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.

Forbid the employee operator to carry additional riders on the Tractor or Implement.

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.

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
Labor, Employment Standard Administration, Wage & Home Division, Child Labor Bulletin #102.)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Safety Section 1-28

INTRODUCTION SECTION

Introduction Section 2-1
© 2010 Alamo Group Inc.

INTRODUCTION

This Rotary Mower 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, instruct, and train. 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 save 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
solution 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 blade
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.
Rhino typically offers three types of shielding to protect the operator, passerby, livestock, and property from
thrown objects... deflectors, single chain guards, and double chainguard. Shielding should be selected based
on the intended use of the mower. Double chainguards or deflectors should be used for highway, right-of-way,
parks or greenbelt mowing or all other mowing where human dwellings, vehicles, or livestock could be within
300 feet of the mower. Chainguards are more durable, provide a longer service life and require less
maintenance and replacement than deflectors. Single chainguards may be sufficient for agriculture and other
mower use only where passersby or property are not within 300 feet of the mower during operation.
No shielding is 100% effective in preventing thrown objects. The possibility of injury and property damage from
this hazard can be substantially reduce by selecting proper shielding, maintaining the mower and shielding in
good operational condition, inspecting the area for foreign debris before mowing, operating the mower at a
minimum cutting height of 4”, and keeping persons at a minimum distance of 300 feet from the mower at all
times during operation.
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.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Introduction Section 2-2

INTRODUCTION

INTRODUCTION
Your FN20 NITRO is a super-duty Cutter/Shredder designed primarily for weed and grass control, brush up to
4-1/2" diameter, and shredding row crops such as cotton and corn stalks. With proper maintenance as
described in this manual, your Cutter will provide you with years of dependable service with a minimum of
repairs.
It is recommended that all operators of this implement read this manual or be instructed of its contents as to
safety, proper operation, and maintenance before beginning operation.
Your FN20 NITRO has been assembled for operation with a specific tractor PTO input speed, either 540 or
1000 RPM. Should you desire to change PTO input speed, contact your local Rhino dealer who will assist you
in performing the necessary modifications. A different Driveline and gearboxes or reverse gear positions are
required. This machine is designed for use with tractors rated 80 HP (60kW) to 170 HP (127kW).
When ordering parts for the Gearboxes and the Drivelines, be sure to specify the PTO speed (540 or 1000
RPM) and the serial number. The serial number is located outside of the right Tongue attaching Plate on the
center Mainframe section.
Chain Guards are extra equipment. Deflectors, Driveline Integral Shields, and Gearbox Shields are standard
equipment and to be used at all times.
To place the warranty into effect, fill out the warranty card in full, giving all the requested information, and mail
promptly. Be sure to give the serial number of this Cutter.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Introduction Section 2-3

INTRODUCTION
Attention Owner/Operator
BEFORE OPERATING THIS MACHINE:

INTRODUCTION

1. Carefully read the Operator’s Manual, completely understand the Safety Messages and instructions, and
know how to operate correctly both the tractor and implement.
2. Fill out the Warranty Card in full. Be sure to answer all questions, including the Serial Number of the
implement. Mail within 30 days of delivery date of this implement.
NOTE: Warranties are honored only if completed “Owner Registration and Warranty” forms are received by
Alamo Group within thirty days of delivery of the implement.
3. Record the Unit Model and Serial Numbers on the Warranty page at the front of the Operator’s Manual.
Keep this as part of the permanent maintenance file for the implement.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Introduction Section 2-4

ASSEMBLY SECTION

Assembly Section 3-1
© 2010 Alamo Group Inc.

ASSEMBLY
DEALER SET-UP INSTRUCTIONS
The mower as received from the factory is virtually completely assembled and requires minimum time to
complete assembly ready for sale.

ASSEMBLY

On a fully assembled unit, do not release the Wing Retaining Strap until the hoses are
attached to the tractor and the Wing Cylinders are filled with oil. Always keep bystanders
away while raising and lowering the wings
To lower the wings, hook the hydraulic hoses to the tractor. From the Operators
Seat use the tractor hydraulic control levers to fill wing cylinders with oil. Keep
coworkers and bystanders away from the implement while filling. For implements
with the wings in the raised or transport position, filling the cylinders should raise
the wings slightly and loosen the wing retaining lock. DO NOT release the wing
Transport Bar/Latch if there is a force on the lock. Use tractor hydraulic control
levers to lower the wing(s). Continue to hold the control lever until both wings are
down and the wing cylinders are fully retracted or extended. Continue to cycle the
cylinders several times by raising and lowering the wings fully to remove any
trapped air. If there is sponginess during the raising cycle, this may indicate that
air is entrapped in the hydraulic circuit. Continue to cycle the cylinders until all
sponginess is removed.
The implement wings should lower slowly when they are allowed to float down
and are not powered down. This is a safety feature built into the system. If the
wings fall rapidly, have the cylinders repaired before operating the implement.
Asm-0002

ASSEMBLY
Select a suitable work area large enough to allow for lowering of the wings. Use extreme caution when
connecting the mower to the tractor. The mower should be securely resting at ground level or setting on blocks.
Keep hands and feet from under the mower deck and clear of pinch points between the tractor hitch arms and
mower pins.
1. Use the implement jack to raise the implement tongue until it is even with the tractor drawbar. Insert the
jack into the jack adapter in the implement tongue and swivel it so that it is vertical. Follow the instructions
on the jack. Install the jack retaining pin. Measure the height of the tractor drawbar and raise the implement
tongue to the same height.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Assembly Section 3-2

ASSEMBLY
2. Make sure the tractor PTO is the correct speed and shaft size for the implement. Ensure the drawbar is
extended the proper distance from the Tractor PTO shaft for desired PTO speed; 540 PTO is 14” and for
1000 PTO speed the distance is 16”

4. Install the retaining bolt through tongue clevis and tractor drawbar. The implement tongue is very heavy.
Make any height adjustments using the implement jack. Place two 1” flatwashers (1) positioned under top
lip of tongue clevis and to the top of drawbar. Insert a 1” diameter grade 5 or 8 bolt (2) through clevis and
drawbar and retain in position with a 1” locknut (3). Tighten the locknut securely but do not overtighten,
which could spring or break the clevis. NOTE: NEVER attach mower to the tractor with a pin not having a
nut.
5. Install the implement tow chain to a secure location on the tractor.
6. Attach proper hydraulic couplers to implement hose ends. Insert the wing hose quick disconnect couplers
into tractor hydraulic remotes.
7. Mount tractor, fasten your seatbelt and start engine. From the operators seat use the tractor hydraulic
control levers to fill wing cylinders with oil. Filling the cylinders should retract the wings slightly to their
minimum closed width. Continue to apply pressure to cylinders for at least 10 seconds to assure they have
filled with fluid.
Keep coworkers and bystanders away from the implement while filling.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Assembly Section 3-3

ASSEMBLY

3. Carefully back tractor to mower. Do not allow coworkers or bystanders between the tractor and the
implement while backing. When dismounting the tractor ALWAYS shut down the tractor, disengage the
PTO, and set the parking brake before dismounting.

ASSEMBLY

8. Remove retaining bracket from end yoke of
main driveline. Remove main driveline from
mower and place on ground or hard surface.
Figure AsmP-R-0120

9. Make sure the wing Transport Bars/Latches are
locked in the position to hold the wings vertical
before removing shipping strap. Figure AsmPR-0118

10. Stand between the wings of the implement and remove nuts holding the shipping strap in place and
remove strap.
Do not stand outside of the wing to remove the shipping strap, if the wing fell it could kill you.
Make sure no bystanders are under the wing or in the area where the wing could fall.

Reinstall nut and flatwasher to retain side skirt.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Assembly Section 3-4

ASSEMBLY

12. From the tractor seat use the tractor hydraulic
control levers to lower the wing(s).
Keep coworkers and bystanders away from the implement while filling.

13. Continue to hold the control lever until both wings are down and the wing cylinders are fully extended.
Continue to cycle the cylinders several times by raising and lowering the wings fully to remove any trapped
air. If there is sponginess during the raising cycle, this may indicate that air is trapped in the hydraulic
circuit. Continue to cycle the cylinders until all sponginess is removed.
14. Test to make sure the wings lower slowly when they are allowed to float down and are not powered down.
This is a safety feature built into the system. If the wings fall rapidly, have the hydraulic system or cylinders
repaired before operating the implement.

CONNECTING DRIVELINE
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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Assembly Section 3-5

ASSEMBLY

11. Filling the cylinders with oil should raise the
wings slightly and loosen the wing Transport
Bars/Latches retaining pin. NOTE: DO NOT
release the wing Transport Bar/Latch if there is
a force on the pin. If there is a force holding the
Transport Bar/Latch in place, use the tractor
hydraulic control levers while in the tractor seat
to raise the wings until the force is relieved.
Release the Transport Bar/Latch and secure in
the storage location. Figure AsmP-R-0119

ASSEMBLY
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)

ASSEMBLY

DRIVELINE ATTACHMENT
The driveline yoke and tractor PTO shaft must be
dirt free and greased for attachment.
To connect the mower driveline to the tractor PTO
output shaft, pull the driveline yoke collar back and
align the grooves and splines of the yoke with those
of the PTO shaft. Push the driveline yoke onto the
PTO shaft, release the locking collar, and position
the yoke until the locking collar balls are seated
onto the PTO shaft. Push and pull the driveline
back and forth several times to ensure a secure
attachment. OPS-R-0003_I
Many of the equipment components are HEAVY (60 lbs. or greater) and Special Lifting
Procedures are recommended. Use lifting assistance such as mechanical assistance, two
people, and proper lifting techniques when connecting or installing the driveshaft to reduce
the possibility of back injuries.
1. Remove double clamp bolts from main driveline implement connection yoke and insert onto power divider
gearbox shaft. Insert clamp bolt and tighten to 170 ft. lbs.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Assembly Section 3-6

ASSEMBLY
2. Inner center axle dual tire assemblies are shipped bolted on wing mount tubes. Remove transport bars
from wings and lower each wing so that inner tire and hub assembly can be removed and installed on
center axle. NOTE: It will be necessary to raise each side of center axle slightly so inner dual tires can be
installed.
3. Install gearbox vents or vent dipsticks if not installed.Check all gearbox lube levels.

TIRES AND WHEELS

When installing Laminated Tires and Wheels note the direction of travel and the curvature of rubber segments
in the tire and install as shown in Figure Asm-R-0127. Do not exceed 20 M.P.H. on Laminated Tires. When
removing Airplane Tires, let all of the air out of the tire before removing lug nuts or wheel bolts or nuts. Remove
valve core to make certain that there is no air pressure left in tube before separating wheel halves to dismount
tires. DO NOT LOOSEN WHEEL CLAMP BOLTS BEFORE PRESSURE IS REMOVED FROM TUBE AND
TIRE TO PREVENT EXPLOSIVE SEPERATION OF WHEEL HALVES WITH POSSIBLE SERIOUS BODILY
INJURY. Do not exceed 20 M.P.H. on Airplane or Rib Implement Tires.
Maximum airplane tire inflation pressure is 50 PSI, minimum inflation pressure is 20 PSI. Inflate ribbed
implement tires to manufacturer rated PSI as shown on the tire sidewall.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Assembly Section 3-7

ASSEMBLY

Before installing any tires and wheels make certain the Cutter is jacked up high enough and is securely
supported. When installing laminated or airplane tires, be sure the flat side of the lug nut is against the wheel.
There are only three types of tires that can be used on this cutter DO NOT USE ANY OTHER TYPE OF TIRE
OR WHEEL, such as automotive tires and rims. DO NOT EXCEED THE MAXIMUM SPEED FOR EACH TYPE
OF TIRE. As excessive speed can cause damage to the machine, tire, and wheel.

ASSEMBLY

Lubricate the PTO drivelines and wheel hubs according to the lubrication information found in the Maintenance
Section.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Assembly Section 3-8

OPERATION SECTION

Operation Section 4-1
© 2010 Alamo Group Inc.

OPERATION

RHINO FN14/FN20 NITRO ROTARY MOWER
OPERATION INSTRUCTIONS
Rhino FN14/FN20 NITRO rotary mowers are manufactured with quality material by skilled workers. These
mowers are designed to cut grass, weeds, small brush and other vegetative material up to 4-1/2” diameter in
areas such as pastures and along highway right-of-ways. The mower is equipped with protective deflectors
and/or chain guards to prevent objects being thrown from the mower by the blades, however, no shielding is
100% effective. All shields, guards, deflectors, and chains equipped on the unit must be maintained on the
mower 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 300 feet 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 rotary mower and are not necessarily of a FN14/FN20 NITRO cutter. Some
pictures may show shields removed for purposes of clarity. NEVER OPERATE this implement without all
shields in place and in good operational condition. The operator must be familiar with the mower and tractor
operation 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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-2

OPERATION
1. Standard Equipment and Specifications
FN14 NITRO

240”

162”

Transport Width

115”

106”

Overall Width

248”

170”

Overall Length

216”

Cutting Height

1/2”***-14-3/4”

Hitch

Pull

Blade Overlap

6”

Blade Carrier

Reinforced Pan or Bar

HP Required (Min.)

80 HP

Gearbox Rating
Power Divider

80 HP
EXTRA EQUIPMENT

325 HP

Open or Closed Center Three-Spool Valve

Center Wing

285 HP

Valve Mounting Kit

Gearbox Limited Warranty

5 year

Ball Hitch

Output Shaft Diameter

2-9/16”

Pintle Hitch (Requires Drawbar Modification)

Blade Tip Speed:

Baffle Kit Assembly

Center 540 RPM

16,328 FPM

Auxiliary Wheels Spindle Kit (For Dual Wheels on

1000 RPM

15,994 FPM

Wings)

Wings 540 RPM

16,328 FPM

Shredding Kit (Bar Carrier Units Only)

1000 RPM

15,994 FPM

Cutting Capacity (Max.)

4-1/2”

Driveline Size

OPTIONAL EQUIPMENT
Single or Double Front & Rear Chain Guards

Main

CAT 6 HD

540 or 1000 RPM

Wings

CAT 6 HD

Constant Velocity or Non C/V Main Driveline

Driveline Limited Warranty

2 Year

Pan or Bar Blade Carriers

Driveline Protection

Slip Clutch

Laminated, Foam-Filled Used Airplane, Used

Deck Thickness

10 Ga.

Plane, Implement, or Recapped Used Airplane Tire

Side Skirts: Replaceable

1/4”x10-1/2”

or Wheel

Replaceable Skid Shoes

Std. Center and Wings

Wing Flex

90 Degrees up, 22 Degrees Down

Deck Rings

Standard

Safety Deflectors

Standard

Tractor Static Vertical
Drawbar Load Rating (Min.)

3100 lbs. *

2900 lbs. *

Weight (Approx.)

7745 lbs. *

7600 lbs. *

* With front and rear double chain guards, 6 foam-filled used airplane tires, main driveline and dishpan blade carriers.
*Safety Deflectors are standard equipment. Single and double chain guards are available as extra equipment at extra cost.
Rhino recommends mowers be equipped with deflectors or double chain guards for all mowing purposes. Single chain
guards may be used for agriculture purposes only and are specifically not recommended for highway, right-of-way, parks or
greenbelt mowing.

**Ratings based on actual field performance.
*** Lowest cutting height obtained by raising side skirt and center skid shoes as described in Section 7.3.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-3

OPERATION

FN20 NITRO
Cutting Width

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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-4

OPERATION
3. TRACTOR REQUIREMENTS
The tractor used to operate the mower must have the power capacity to lift, pull, and operate the Power Take
Off (PTO) at the mower’s rated speed while traveling at a ground speed between 2 and 5 MPH. Operating the
mower with a tractor that does not meet the following requirements may cause tractor or mower damage and
be a potential danger to the operator and passersby.

Tractor Requirements and Capabilities
ASABE 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 ........ NITRO FL20 80HP; NITRO FL14 80HP
• Drawbar............................................ 14” length for 540 RPM unit; 16” or 20” length for 1000 RPM unit,
mower equipped with Pintle Hook (Optional Equipment) drawbar length must be modified (see 3.4 Drawbar), rated to carry weight of mower, safety chain attachment point (See Chart Below)
• Tongue Weight ................................. 3100 lbs.
• Hydraulics ........................................ Minimum of 1 hydraulic port (extra 3-spool valve required). Minimum
2 ports, 3 ports recommended if additional,3-spool control valve is not used.
• Front End Weights............................ As needed to maintain 20% weight on front axle
Power Take Off 540 RPM 6-spline or 1000 RPM 21-spline, 1-3/8” diameter output shaft depending on mower
operating speed.

Drawbar
Category

Min.
Tractor HP

III

For other PTO & Drawbar Category Combinations see your Tractor specifications.

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 rollover-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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-5

OPERATION

•
•

OPERATION
3.2 Tractor Safety Devices

OPERATION

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

3.3 Tractor Horsepower
The horsepower required to operate the mower depends on several operating factors including the vegetation
to be cut, terrain condition, operator experience, condition of the mower and tractor, and others. For most
mowing conditions, the FL14 NITRO and FL20 NITRO mower requires a tractor with a minimum of 80 HP.
Operating the mower with a tractor that does not have adequate power may damage the tractor engine.
The tractor drawbar must be positioned at a certain
length based on the operating speed of the mower
for proper driveline operation. If the mower is a 540
RPM unit, position the drawbar length from shaft end
to hitch hole at 14”. For 1000 RPM mowers, set the
drawbar length at 16” for 21 spline 1-3/8” mowers
and at 20” for 1-3/4” 20 spline mowers.
Ensure that the drawbar is rated to carry the
tongue weight of the mower.

Pintle Hook Hitch-Optional Equipment
Drawbar length must be modified to
dimension “A” (CV Driveline = 17” ± 2”)

obtain

3.4 Tractor Hydraulics
The mower center section and each wing are positioned with hydraulic cylinders that are operated by the
tractor hydraulic pump. The tractor must have a minimum of 2 hydraulic control valves devoted to the mower
unless the tractor is fitted with a 3-spool control valve (extra equipment).
A 3-spool control valve is required if the tractor is equipped with a single valve and is recommended for those
with two valves so that the center section and each wing can be controlled independent of one another. Refer
FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-6

OPERATION
to the Assembly Section of this manual for properly equipping the tractor with a 3-spool control valve. Tractors
equipped with three hydraulic ports can position the center section and each wing independently with no extra
equipment. If the tractor is equipped with only two hydraulic ports and a 3-spool control valve is not used, the
wings cannot be operated independently and will raise and lower at different speeds.

3.5 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

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 20 or 21spline shaft. Note: 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_A

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

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-7

OPERATION

3.6 Power Take Off (PTO)

OPERATION
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)

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 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)
Never allow children or other persons to ride on the Tractor or Implement.
Falling off can result in serious injury or death. (SG-10)

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

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-8

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.

Before starting the tractor ensure the following:
• 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 PTO control lever is disengaged.
• The 3-point hitch control lever is in the lowered position.
• The hydraulic remote control levers are in the neutral position.
• The tractor transmission levers are in park or neutral.
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-U-0028

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)

6. CONNECTING THE MOWER TO THE TRACTOR
Use extreme caution when connecting the mower to the tractor. The mower should be securely resting at
ground level or setting on blocks. Keep hands and feet from under the mower deck and clear of pinch points
between the tractor hitch arms and mower pins. OPS-R-0001
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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-9

OPERATION

Essential Tractor Controls:
• Locate the light control lever.
• Locate the engine shut off control.
• Locate the brake pedals and the clutch.
• Locate the PTO control.
• Locate the 3-point hitch control lever.
• Locate the hydraulic remote control levers.

OPERATION
6.1 Connecting the Mower Tongue to the Tractor
1.

OPERATION

5.
6.

Ensure the tractor is equipped with the
correct PTO shaft and the drawbar is set at
the correct length.
Using the parking jack, position the tongue
clevis to the height of the tractor drawbar.
Adjust the mower tongue clevis to be level
and parallel with the tractor drawbar using
the control rod connecting the mower tongue
clevis to the deck.
Board the tractor and start the engine. Back
the tractor to the mower aligning the drawbar
hitch hole with the mower tongue clevis.
Turn off the tractor engine, place the tractor
in park, and set the parking brake before
dismounting.
To attach the mower, place two 1” flatwashers (1) positioned under top lip of tongue clevis and to the
top of drawbar. Insert a 1” diameter grade 5 or 8 bolt (2) through clevis and drawbar and retain in
position with a 1” locknut (3). Tighten the locknut securely but do not overtighten which could spring or
break the clevis. NOTE: NEVER attach mower to the tractor with a pin not having a nut.
Securely attach the mower safety chain to the tractor drawbar or drawbar support frame.
Lower the jack until the tongue is completely supported by the drawbar. Remove jack from the tongue
and place on storage bracket of mower.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-10

OPERATION
Safety Tow Chain
If the mower is towed on a public roadway, a safety chain with tensile strength equal to or greater than the
gross weight of the mower must be connected between the tractor and mower. This will help control the
implement in the event the tongue becomes disconnected from the drawbar. Make sure the chain is attached
to a secure location on the tractor and not to an intermediate support. After connecting both ends of the safety
chain, drive the tractor to the right and left to check for proper chain length. Adjust length as necessary and
allow only enough slack in the chain to make a maximum turn in both directions. When not in use, store the
safety chain to protect it from mud or standing water by wrapping the chain around the tongue. Replace the
safety chain if one or more links or end fittings are broken, stretched or otherwise damaged or deformed.

With the tractor shut down and secured in position, relieve hydraulic pressure from the tractor by moving the
control levers back and forth several times or placing the levers in the float position.
When connecting the mower hydraulic lines, keep hoses, quick couplers, and swivels free of contamination.
Never leave a disconnected hose end open and cap the tractor hydraulic outlet ports when not in use. If the
tractor ports or mower hydraulic hose ends become contaminated, wipe clean with a rag before connecting.
Operating Mower Hydraulics with Three Tractor Hydraulic Ports
Connect one hose into each hydraulic port. Connect lines to correspond with position of hydraulic control
levers.
Operating Mower Hydraulics with Two Tractor Hydraulic Ports
The lines that operate the wings must be plumbed together and will be controlled using one hydraulic control
valve and the center section with the remaining control valve. Ensure that the operator is aware that each wing
cannot be controlled independently nor will they raise and lower simultaneously.
Operating the Mower Hydraulics with a 3-Spool Hydraulic Control Valve (Extra Equipment)
Ensure the valve matches the hydraulic operating system of the tractor (open or closed center). Refer to the
Assembly Section for additional information on equipping the tractor with a 3-spool control valve.
Mount the valve bank to a tractor fender or other accessible location. Connect valve bank inlet and outlet lines
to outlets of the same tractor hydraulic port. Connect the mower hydraulics to the control valve bank with the
center section line to the right port. Connect the wing cylinder lines to the control valve positioned to
correspond with the left and right wing.
To activate the 3-spool hydraulic control valve, tie the tractor’s hydraulic control lever back to keep hydraulic oil
continuously fed to the valve bank.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-11

OPERATION

6.2 Connecting Mower Hydraulic Lines to the Tractor

OPERATION
Hydraulic Line Support
After connecting the mower hydraulic lines to the tractor, support the hoses with the equipped brackets.
Ensure that hoses do not contact the driveline, do not bind while turning, and do not become pinched or
kinked.

OPERATION

Hydraulic Cylinder Priming
Hydraulic Cylinders must be filled with hydraulic oil before removing the wing transport braces to lower the
mower wings. Hydraulic cylinders and lines are filled by holding the valve control levers in the raised position
until the cylinders fully retract (wing cylinders) and extend (center cylinder). Place control levers in the float
position and repeat process a second time. Ensure wings are entirely supported by the cylinders before
removing the transport braces. NEVER drive out bar pins and NEVER remove braces that have tension on
them.

7. SETTING THE MOWER
Properly setting the cutting height is essential for efficient and safe operation. A properly set mower will make
a more uniform cut, distribute clippings more evenly, require minimal tractor work, and follow the contour of
uneven terrain. NOTE: Avoid very low cutting heights, striking the ground with the blades gives the most
damaging shock loads and will cause damage to the mower and drive. Blades contacting the ground may
cause objects to be thrown out from under the mower deck. Always avoid operating the mower at a height
which causes the blades to contact the ground. OPS-U- 0010
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)

7.1 Setting Deck Height
LEVELING DECK CENTER SECTION
1.
2.

Place the tractor and mower on a level
surface and lower both wings.
Use the center section hydraulic cylinder to
set the mower at approximately 3/4” above
the desired cutting height. The additional
height is necessary so that after the mower
has been leveled, the deck pitch can be set
such that the front of the mower is slightly
lower than the rear.
Shut down the tractor, place the
transmission in park, and set the parking
brake before dismounting.

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-12

OPERATION
4.

5.
6.

Level the mower deck front to rear by adjusting the leveling rods linking the tongue to the rear axle.
DO NOT allow feet or other body part underneath the mower when making adjustments. To adjust rod
length, loosen jamnut and screw turnbuckles. To lower the front, lengthen the rods and to raise the
front, shorten the rods. DO NOT unscrew turnbuckles to the point that either rod threaded ends
becomes disconnected which will cause the mower to fall. Re-tighten jamnuts when deck is leveled.
IMPORTANT: Alternate adjustments between rods and adjust at equal lengths to maintain equal
tension. Improper adjustments may cause rods to snap or bend.
Place split collar assemblies on the center axle hydraulic cylinder rod to maintain a set cutting height
each time the mower is raised and lowered.

To level the wing sections with the deck center,
adjust the leveling screw between the wing axle
and the center axle. To lower the wing, loosen the
jamnut and shorten the screw assembly, lengthen
the screw assembly to raise the wing. After wings
are leveled, retighten jamnuts to maintain settings.

7.2 Setting Deck Pitch
To facilitate safe and efficient operation, the mower
should be operated with the deck approximately
3/4” LOWER IN THE FRONT THAN THE REAR.
Operating the mower at this pitch will allow the
mower to cut the grass only once and requires less
work from the tractor. In addition, a more even
distribution of the clippings from the rear of the
mower will be achieved with this deck pitch.
Adjust the leveling rods linking the tongue to the
rear axle until the front of the mower is at least 3/4”
lower in the front that than the rear. To lower the
front, lengthen the leveling rods and to raise the
front shorten the leveling rods. IMPORTANT:
Adjust the leveling rods the same amount and
maintain equal tension in the rods. Improper
adjustment may cause rods to snap or bend. Retighten the jamnuts after the deck pitch has been set. OPS-R0002

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-13

OPERATION

LEVELING WING SECTIONS WITH CENTER

OPERATION
7.3 Lowest Cutting Height

OPERATION

NOTE: Only operate in the lower position when you
are mowing in an agricultural application, be sure
there are no bystanders, passerby or livestock with
in 300 feet. .
To achieve the lowest possible cutting height, raise
the side skirt from the upper set of holes to the
lower set of holes shown in Figure Op-245

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)
Also raise both skid shoes from the lower holes to
the upper holes as shown in Figure Op-246.
NOTE: Change height back to normal position
before operating or mowing on roadside, ditches
or greenbelts

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-14

OPERATION

8. DRIVELINE ATTACHMENT
The driveline yoke and tractor PTO shaft must be
dirt free and greased for attachment.
To connect the mower driveline to the tractor PTO
output shaft, pull the driveline yoke collar back and
align the grooves and splines of the yoke with those
of the PTO shaft. Push the driveline yoke onto the
PTO shaft, release the locking collar, and position
the yoke until the locking collar balls are seated
onto the PTO shaft. Push and pull the driveline
back and forth several times to ensure a secure
attachment. OPS-R-0003_A

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-15

OPERATION

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)

OPERATION

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)
When fitting the mower to the tractor , the telescoping driveline must be inspected to ensure that at its most
compressed position, the shafts do not “bottom out”, and when at its farthest extended postion, there is
sufficient engagement between the profiles to operate safely. At its shortest length, there must be at least at 1”
clearance between each profile end and opposite profile universal joint. At its farthest operating extension, a
minimum profile engagement of 6” must be maintained.
“Bottoming Out” Check Procedure
•
•
•
•

•

Disconnect driveline from the tractor and slide
the profiles together until fully compressed.
Place a mark on the inner shield 1/8” from the
end of the outer shield.
Reattach the driveline to the PTO Shaft.
Lift Type - With the PTO NOT TURNING, raise
and lower the mower and watch shaft movement.
Pull Type - With the PTO NOT TURNING, drive
the tractor and mower through the sharpest turn
possible and watch shaft movement. With the
PTO NOT TURNING, drive the tractor and
mower through the most severe terrain conditions expected and watch shaft movement.
Raise the mower and watch the driveline as it
approaches the mark. If the distance between the mark and the end of the outer shield tube becomes less
than 2” at any point, contact your local dealer or tech service for proper directions. OPS-R-0004_B

Engagement Check Procedure
•

With the driveline attached, position the mower to the point where the telescoping driveline is at its maximum
extension. Completely shut down the tractor and secure in position.
•
Mark the inner driveline shield 1/8” from the end of the outer shield.
•
Disconnect the driveline from the tractor and separate the two driveline halves.
•
Measure the distance from the mark to the end of the inner profile. This length is the amount the driveline profiles were
engaged.
•
If the engaged length is less than 6”, the shaft is considered too short and should be replaced with a longer shaft.
Consult an authorized dealer to purchase the required driveline length.
NOTE: If the driveline cannot be shortened and still maintain the required profile engagement, the operator must be made
aware of terrain conditions and avoid situations which pose a potential problem to avoid damaging the driveline or move
drawbar to 16” or 20” position for required clearance. OPS-R-0005_O

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-16

OPERATION
8.1 Constant Velocity (CV) Driveline
For mowers equipped with a Constant Velocity (CV) driveline, the maximum turning angle between the tractor
and mower must be determined to ensure the joint angle does not over-extend which can cause CV joint
damage. Constant Velocity joints enable the driveline to operate smoothly with no vibrations and clattering at
angles up to 70°. Angles greater than 80° can result in mechanical damage to the CV joint and mower
driveline.
The Constant Velocity joint must be lubricated every 8 hours of operation as specified in the Maintenance
Section. Failure to properly lubricate the joint will result in accelerated wear and joint component failure.
With the mower attached to the tractor and the driveline disconnected from the tractor PTO stub make a
hard left turn until there is approximately a 1" clearance between the left rear tractor tire and mower frame or
tongue.
Stop and completely shut down the tractor. Place the tractor in Park and apply the Parking Brake before
dismounting.
Check the CV joint at this maximum turning radius by holding the driveline yoke above the PTO shaft and then
angle the CV joint to its maximum angle. A minimum difference of 10 degrees between the center line of the
yoke and the PTO shaft must be maintained to ensure the joint will not be over angled. If the joint cannot be
angled at least 10°, there is a potential problem of over-angling the joint while making sharp turns.
Solutions: To ensure the joint is not damaged, check the following:
Check the drawbar length to ensure that it is at the proper length for the RPM speed of the mower.
Move the tractor rear tires wider apart to limit the tractor turning radius.
Position the mower at multiple angles and perform the above procedure. Determine the sharpest turning
radius that maintains a safe operating angle and note this position to the operator. OPS-R-0006

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-17

OPERATION

CV Driveline Maximum Angle Check Procedure

OPERATION
The Constant Velocity PTO driveline is HEAVY (70 lbs or greater) and Special Lifting
Procedures are recommended. Use lifting assistance such as mechanical assistance, two
people, and proper lifting techniques when connecting or installing the driveshaft to reduce
the possibility of back injuries.

OPERATION

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)

9. PRE-OPERATION INSPECTION AND SERVICE
Before each use, a pre-operation inspection and service of the implement and tractor must be performed.
This includes routine maintenance and scheduled lubrication, inspecting that all safety devices are equipped
and functional, and performing needed repairs. DO NOT operate the unit if the pre-operation inspection
reveals any condition affecting safe operation. Perform repairs and replacement of damaged and missing
parts as soon as noticed. By performing a thorough pre-operation inspection and service, valuable down time
and repair cost can be avoided. OPS-U-0029
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
immediate entanglement, injury or death. (S3PT-11)
DO NOT allow any person under a folded wing unless wing is securely
locked up or supported. DO NOT approach the Implement unless the
Tractor is turned off and all motion has ceased. Never work under the
frame work, or any lifted component unless the implement is securely
supported or blocked up. A sudden or inadvertent fall by any of these
components could cause serious injury or even death. (STI-03)
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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-18

OPERATION
9.1 Tractor Pre-Operation Inspection/Service

9.2 Mower Pre-Operation Inspection/Service
Before each mower use, a complete inspection and service is required to ensure the mower is in a good and
safe working condition. Damaged and/or broken parts should be repaired and/or replaced immediately. To
ensure the mower is ready for operation, conduct the following. OPS-R-0007
All Safety Shields, Guards and Safety devices including (but not
limited 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 POSSIBLY
CAUSE SERIOUS INJURY FROM THROWN BLADES. (SGM-10)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-19

OPERATION

Refer to the tractor operator’s manual to ensure a
complete pre-operation inspection and scheduled
service
is
performed
according
to
the
manufacturers recommendations. The following
are some of the items that require daily service and
inspection:
• Tire condition/air pressure
• Wheel lug bolts
• Steering linkage
• PTO shield
• SMV sign is clean and visible
• Tractor’s lights are clean and functional
• Tractor Seat belt is in good condition
• Tractor ROPS is in good condition
• ROPS is in the raised position
• No tractor oil leaks
• Radiator free of debris
• Engine oil level and condition
• Engine coolant level and condition
• Power brake fluid level
• Power steering fluid level
• Fuel condition and level
• Sufficient lubrication at all lube points
• Air filter condition OPS-U-0030

OPERATION

OPERATION
The operator’s manual and safety signs affixed on
the unit contain important instructions on the safe
and proper use of the equipment. Maintain these
important safety features on the implement in good
condition to ensure the information is available to
the operator at all times.
• Ensure the manual canister is secured to the
equipment with the operator’s manual inside.
• Ensure all safety signs are in place and legible.
Replace missing, damaged, and illegible
decals. OPS-U- 0011

•
•
•
•

•

•
•

Ensure the mower hitch is securely attached to
the tractor drawbar with a proper size bolt and
secured nut.
Ensure that a properly rated safety tow chain is
equipped securing the mower to the tractor.
Check that the main driveline is securely
attached to the tractor and the clamping cone is
seated in the groove of the PTO shaft.
Ensure the divider drivelines are secure at both
ends. OPS-R-0008

Ensure chain guards and/or rubber deflectors
are in position and not damaged. Replace
worn, broken, and missing sections immediately.
Ensure the driveline integral shields are in good
condition and rotate freely.
Inspect that all bolts and screws are in position
and are properly torqued. OPS-R-0009

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-20

OPERATION
•
•
•

•

•
•

Perform scheduled lubrication as specified in
the maintenance section.
Inspect each gearbox oil level and replenish if
needed. A low oil level is a warning sign that
the gearbox may be cracked or its seal is
damaged and needs to be replaced.
Ensure all gearbox vents are in place and free
from clogs. OPS-R-0011_A

Inspect blades and blade bolts for looseness
and excessive wear. Make sure the mower is
securely blocked up before crawling beneath.
Replace damaged, worn, and missing blades
as complete sets to maintain rotary balance.
Ensure carrier hub nuts are tightened with the
cotter pin inserted and spread.
Inspect the condition of the deck skid shoes
and the skid shoe attaching hardware.
OPS-R-0012

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-21

OPERATION

•

Ensure the tractor PTO master shield is in
place, lowered and in good condition.
Ensure each mower slip clutch shield is
secured in place and in good condition.
Ensure the driveline slip clutches are properly
adjusted and the friction plates are not frozen
together. Reference the Maintenance Section
for proper slip clutch maintenance. OPS-R0010

OPERATION
•

OPERATION

•

•
•
•
•

•

Ensure each hydraulic cylinder is installed and
retained correctly. Ensure the proper size pins
are used to retain the cylinders in place and
are secured with pins.
Check for hydraulic oil leaks on the cylinders,
along the hydraulic lines, and at tractor
hydraulic ports. IMPORTANT: DO NOT use
your hands to check for oil leaks. Use a piece
of heavy paper or cardboard to check for
hydraulic oil leaks. OPS-R-0013_A

Ensure that the mower is equipped and
secured with wing transport locks.
Check the condition of the wing hinge pins.
Check the condition of the mower axle
suspension spring.
Inspect mower tire condition, wheel bearings,
and lug nut torque. OPS-R-0014_A

Before mower operation ensure that the bolt is
removed from both floating links on the unit.
These bolts are for shipping purposes only.
OPS-R-0086

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-22

OPERATION
9.3 Cutting Component Inspection
Inspect blade pan and blade assembly for the following:

OPERATION

OPS-U-0031

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-23

OPERATION
Operating the mower with loose blade hardware will damage the blade holder or blades and
can result in blade breakage or blade fastener failure. Broken blades or bolts can be thrown
out from under the mower for distances up to 300 feet. When the blades are replaced, the
fastening hardware must be replaced. Check and retighten the blade hardware after the first
eight hours of operation. In severe cutting conditions, recheck the blade carrier and blade
bolt torque every 50 hours.

OPERATION

To help prevent structural damage caused by loose hardware, tighten gearbox mounting
hardware as specified. Check the fastener torque after first 8 hours of use and every 50
hours thereafter.

•
•
•
•

Inspect the Blades daily for abnormal wear. REPLACE BOTH BLADES on that carrier
IMMEDIATELY if either blade has:
•Become bent or deformed from it’s original shape or
Any cracks are visible, or
Deep gouges in the blade’s surface are present, or
Gouges or chipped areas in the cutting edge are larger than 1/2”(12.7mm), or
The material on the leading edge has been worn away by more than 1/2(12.7mm)”

Failure to replace abnormally worn blades may lead to catastrophic failure of the blades and ejection of the
broken part with tremendous force which may cause serious bodily injury or death. OPS-U-0032

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-24

OPERATION
9.4 Blade Bolt Inspection
Inspect Blade Bolt Head daily for wear as followed:

OPERATION
Inspect the Blade Bolt Heads daily for abnormal wear. REPLACE BOTH BLADE BOLTS on
the Blades IMMEDIATELY if either blade bolts has:
• Visible cracks or
• If the recessed area on blade bolt is worn off or
• If Blade Bolt has gouges or chipped areas.
Failure to replace abnormally worn blade bolts may lead to catastrophic failure of the blades and ejection of
the broken part which may cause serious bodily injury or death.
Always replace Blade Bolts with new bolts whenever replacing the Blades. OPS-U-0037

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-25

OPERATION

Rotary Mower PRE-OPERATION Inspection
Mower ID#________________

Make ____________________

Date:

Shift

________________

____________________

Before conducting the inspection, make sure the tractor engine is off, all
rotation has stopped and the tractor is in park with the parking brake
engaged. Make sure the mower is resting on the ground or securely blocked
up and all hydraulic pressure has been relieved.

Condition at
Start of Shift

Item

Specific Comments if
not O.K.

The Operator’s Manual is in the canister on the mower
All safety decals are in place and legible
The tongue/hitch connection bolts & pins are tight
There are no cracks in tongue or hitch
The tow chain is secured to the tractor & mower
The hydraulic cylinders pins are tight
There are no leaking or damaged hoses
The mower deck is clear of cut grass and debris
Chain guards/deflectors are in place & in good condition
Driveline/gearbox shields are in good condition
Driveline clutches are in good condition; not frozen
Driveline telescoping members & U-joints are lubricated
Driveline yokes are securely attached to PTO & mower
Gearbox mounting bolts are tight
Gearbox oil is at the proper level
Blade carrier retaining nut is tight
Blades are not chipped, cracked or bent
Blade bolts are tight
Wheel lug nuts are tight
Transport locks are in good condition

Operator’s Signature:

DO NOT OPERATE an UNSAFE TRACTOR or MOWER

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-26

OPERATION
Tractor PRE-OPERATION Inspection
Tractor ID#________________

Make ____________________

Date:

Shift

________________

____________________

Condition at
Start of Shift

Item

Specific Comments if
not O.K.

The flashing lights function properly
The SMV Sign is clean and visible
The tires are in good condition with proper pressure
The wheel lug bolts are tight
The tractor brakes are in good condition
The steering linkage is in good condition
There are no visible oil leaks
The hydraulic controls function properly
The ROPS or ROBS Cab is in good condition
The seatbelt is in place and in good condition
The 3-point hitch is in good condition
The drawbar pins are securely in place
The PTO master shield is in place
The engine oil level is full
The brake fluid level is full
The power steering fluid level is full
The fuel level is adequate
The engine coolant fluid level is full
The radiator is free of debris
The air filter is in good condition

Operator’s Signature:

DO NOT OPERATE an UNSAFE TRACTOR or MOWER

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-27

OPERATION

10. DRIVING THE TRACTOR AND IMPLEMENT
Safe tractor transport requires the operator possess a thorough knowledge of the model being operated and
precautions to take while driving with an attached implement. Ensure the tractor has the capacity to handle the
weight of the implement and the tractor operating controls are set for safe transport. To ensure safety while
driving the tractor with an attached implement, review the following. OPS-U- 0012
This Implement may be 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)
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)

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-28

OPERATION
10.1 Starting the Tractor
The procedure to start the tractor is model specific.
Refer to the tractor operator’s manual for starting
procedures for your particular tractor. Consult an
authorized dealer if the starting procedure is
unclear. Ensure the 3-point control lever is in the
lowered position and the PTO is disengaged before
starting the tractor. OPS-U-0033

Make sure the tractor brakes are in good operating
condition. Tractor brakes can be set to operate
independently allowing single rear wheel braking
action or locked together to provide simultaneous
rear wheel braking. FOR MOST DRIVING AND
OPERATING CONDITIONS, THE BRAKE PEDALS
SHOULD BE LOCKED TOGETHER TO PROVIDE
THE MOST EFFECTIVE BRAKING ACTION.
Always disengage the tractor differential lock when
turning. When engaged the differential lock will
prevent or limit the tractor from turning. During
normal cutting conditions, locking the differential
provides no benefit and should not be used. OPSU- 0013
Be aware of the operating
conditions. Do not operate the Tractor with weak or faulty brakes. When operating down a
hill or on wet or rain slick roads, the braking distance increases; use extreme care and
reduce your speed in these conditions. 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.

10.3 Operating the Mower Wings
Wings are positioned with hydraulic cylinders. It is recommended that the tractor be equipped with three
hydraulic ports or a 3-spool control valve be used so that each section can be controlled independently.
Ensure the hydraulic cylinders and lines are filled with oil by holding the valve control levers in the raised
position until the cylinders fully retract (wings) and extend (center). Only operate the mower with both wings
fully lowered, NEVER operate the mower with a raised wing. Wait until the blades are at a complete stop
before raising wings. OPS-R-0015

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OPERATION

10.2 Brake and Differential Lock Setting

OPERATION

10.4 Transport Position
To raise mower wings, drive the unit to a level area
and retract the wing hydraulic cylinders. DO NOT
raise wings with the mower positioned on an
embankment or other inclined position to prevent
overturning the mower. After the wings are fully
raised, install transport lock braces to prevent wings
from inadvertently falling. NOTE: If the transport
lock braces can not be easily installed, lower the
mower wings and remove rod end of cylinder and
adjust the rod clevis in or out to match the transport
brace length.
The center of gravity is raised and the mower more
prone to tipping when the wings are in the raised
position. When transporting, only raise the center
section high enough to clear ground obstacles.
OPS-R-0016
When the Wings are folded for transport, the center of gravity is raised and the possibility of
overturn is increased. Drive slowly and use extreme caution when turning on hillsides.
Overturning the Implement could cause the Implement to overturn the Tractor and vice
versa resulting in serious injury or even death. Never fold wings on a hillside...the
Implement may overturn. (STI-02)

10.5 Operating Position
To lower the wings, remove the transport lock
braces and secure braces on storage bracket. DO
NOT drive out transport brace pins. The wing
cylinder may need to be retracted to remove tension
for brace removal. After removing brace bars,
extend wing hydraulic cylinders and fully lower
wings.
The valves operating wing cylinders should be
placed in the float position while mowing to allow the
mower to follow the contour of uneven terrain and to
prevent the wings from creeping up.
When
extending a wing over a ditch for mowing, place the
control valve lever detents in the center position.
This will give the mower more stability and prevent
the opposite wing from raising. DO NOT operate
the mower with the valves in the detent position for
extended periods of time to prevent deck frame
damage. OPS-R-0017
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)

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OPERATION
10.6 Driving the Tractor and Cutter

To avoid overturns, drive the tractor with care and at
safe speeds, especially when operating over rough
ground, crossing ditches or slopes, and turning
corners. Tractor wheel tread spacing should be
increased when working on inclines or rough ground
to reduce the possibility of tipping.
Use extreme caution when operating on steep
slopes. Keep the tractor in a low gear when going
downhill. DO NOT coast or free-wheel downhill.
OPS-R-0018

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OPERATION

Start off driving at a slow speed and gradually increase your speed while maintaining complete control of the
tractor and mower. Moving slowly at first will also prevent the tractor from rearing up and loss of steering
control. The tractor should never be operated at speeds that cannot be safely handled or which will prevent
the operator from stopping quickly during an emergency. If the power steering or engine ceases operating,
stop the tractor immediately as the tractor will be difficult to control.
Drive the tractor with the 3-Point lift arms in the raised position and lock the control lever in the transport detent
position to prevent damage to the mower driveline and tongue when turning.
Perform turns with the tractor and mower at slow
speeds to determine how the tractor with an
attached mower handles a turn. Determine the safe
speed to maintain proper control of the tractor when
making turns.
When turning with a towed
implement, the overall working length of the unit is
increased. Allow additional clearance for the mower
when turning..

OPERATION

10.7 Crossing Ditches and Steep Inclines
When crossing ditches with steep banks or going up
sharp inclines, it is possible that the main driveline
inner profile will penetrate into the outer housing to its
maximum depth until the assembly becomes solid
(driveline is at its extreme shortest length). This type
of abusive operation can cause serious damage to
the tractor and mower drive by pushing the PTO into
the tractor and through the support bearings or
downward onto the PTO shaft, breaking it off.

Damage resulting from overcollapse of the driveline’s inner profile and its outer housing may allow the driveline to come
loose from the Tractor which could cause bodily injury to the operator or bystanders and/or
extensive damage to the Tractor or Implement. OPS-R-0020
NOTE: See Section 7.1 Driveline Length Check and “Bottoming Out” Check Procedure.
When contronted with an incline or ditch, do not
approach from an angle which is perpendicular or
straight on as damaged to over collapse of the
driveline may occur.
When crossing such terrain, the implement should
be fully lowered for a lower center of gravity and
added stability. OPS-R-0021

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OPERATION

11. OPERATING THE TRACTOR AND IMPLEMENT
THE OPERATOR MUST COMPLETELY UNDERSTAND HOW TO OPERATE THE TRACTOR AND
IMPLEMENT AND ALL CONTROLS BEFORE ATTEMPTING TO OPERATE. The operator must read and
understand the Safety and Operation Sections of the implement and tractor operator’s manuals. These
manuals must be read and explained to any operator who cannot read. Never allow someone to operate the
implement and tractor without complete operating instructions.
Before starting any operation, the operator must become familiar with the area to be worked in and any
obstacles and hazards contained within to ensure safety to the operator, bystanders, and equipment. Special
attention should be paid to foreign debris, rough terrain, steep slopes, and passersby and animals in the area.
OPS-U- 0015

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)

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Operation Section 4-33

OPERATION

Inclines and ditches should be approached along a
line which is at an angle as shown. This type of
path will reduce the possibility of over-collapse of
the driveline and resulting damage. If the gradient
is so steep that such an approach increases the
possibility of a tractor roll-over, select an alternate
crossing path.
When operating the tractor and mower across
slopes and inclines, through ditches, and other
uneven terrain conditions, it is important to maintain
sufficient deck to ground clearance. Blade contact
with the ground may cause soil, rocks and other
debris to be thrown out from under the mower
resulting in possible injury and/or property damage.
Ground contact also produces a severe shock load
on the mower drive and to the mower blades
resulting in possible damage and premature wear.
OPS-R-0022

OPERATION
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)

OPERATION

11.1 Foreign Debris Hazards
Before mowing, inspect the area to make sure
there are no foreign objects that the mower blades
could hit or become entangled with. Remove all
foreign objects and debris. If objects are too big to
remove, mark them clearly and be sure to prevent
the mower blades from contacting them.
If you hit a solid object or foreign debris, stop the
mower and tractor at once. Immediately idle the
engine speed and disengage the PTO. Wait for all
mower rotating motion to stop, then raise the
mower and move the tractor and implement off the
object. Inspect the area and remove, or mark the
location of the debris. Inspect the condition of the
mower and make any needed repairs immediately.
Make sure the blades are not damaged and the
carrier is balanced before resuming operation.
Always wear your seat belt securely fastened and
only operate the tractor and mower with the ROPS
in the raised position. If the tractor or mower hits a
tree stump, rock, or bump, a sudden movement
could throw you off of the seat and under the
tractor and/or mower. The seat belt is your best
protection from falling off the tractor and the ROPS
provides protection from being crushed during a
tractor roll-over. OPS-R-0023

11.2 Bystanders/Passersby Precautions
If a bystander comes within 300 feet of the tractor while the mower is being operated, stop the tractor at once,
idle the engine and disengage the PTO. Do not engage the PTO again until all bystanders are well past the
300 foot distance. OPS-R-0024

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Operation Section 4-34

OPERATION

11.3 Engaging the Power Take Off (PTO)
Before engaging the PTO, make certain that the area is clear of bystanders and passersby. The implement
must be completely lowered and the deck positioned at a safe operating height. NEVER engage the PTO with
the implement in the raised position.
Set the tractor engine speed at approximately 1,000 RPM before engaging the PTO. Shift the PTO control to
the on position, and slowly increase the engine speed until the PTO is operating at the rated speed. If you
hear unusual noises or see or feel abnormal vibrations, disengage the PTO immediately. Inspect the
implement to determine the cause of the noise or vibration and repair the abnormality. OPS-U- 0027

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)
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)

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OPERATION

11.4 PTO RPM and Ground Speed
Ground speed for mowing will depend upon the height, type, and density of vegetation to be cut.
Recommended speed for efficient mower performance is between 2 and 5 mph(3-8 kph). Operate the mower
at its full rated PTO speed to maintain blade speed for a clean cut. Refer to the tractor operator’s manual or
the tractor instrument panel for the engine speed and gear to provide the required PTO and desired ground
speed. Make sure that the mower is operating at its full rated speed before entering the vegetation to be cut.
If it becomes necessary to temporarily regulate engine speed, increase or decrease the throttle gradually.
Ground speed is achieved by transmission gear selection and not by the engine operating speed. The
operator may be required to experiment with several gear range combinations to determine the best gear and
range which provides the most ideal performance from the mower and most efficient tractor operation. As the
severity of cutting conditions increase, the ground speed should be decreased by selecting a lower gear to
maintain the proper operating PTO speed. OPS-R-0025

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)

11.5 Operating the Mower
Only operate the mower from the tractor operator’s seat with the seatbelt securely fastened. The tractor must
be equipped with a ROPS in the raised position or a ROPS cab.
The mower is designed to cut vegetation up to 4-1/2” in diameter. Sharp blades will produce a cleaner cut and
require less power. Travel at a speed that allows the mower sufficient time to cut through the vegetation and
maintain the PTO operating speed to prevent overloading the mower and tractor. Choose a driving pattern
that provides the maximum pass length and minimizes turning.
Under certain conditions, tractor tires may roll some grasses down preventing them from being cut at the
same height as the surrounding area. When this occurs, reduce the tractor ground speed while maintaining
the operating speed of the mower. A slower ground speed will permit grasses to at least partially rebound and
be cut. Taking a partial cut and/or reversing the direction of travel may also help produce a cleaner cut.
Avoid mowing in the reverse direction when possible. In situations where the mower must be backed to
access areas to be cut, make sure there are no persons or other foreign debris behind the mower before
mowing in reverse. When mowing in reverse, operate the tractor and mower at a reduced ground speed to
ensure tractor and mower control is maintained. OPS-R-0026_C

Do not mow with two machines in the same area except with Cab tractors with the windows
closed. (SGM-11)

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OPERATION
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
300 feet (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)

(SGM-08)

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)

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Operation Section 4-37

OPERATION

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.

OPERATION

OPERATION
When you get to the end of a pass, slightly raise the
mower (2-4”) before turning. Never raise the
mower entirely while the blades are turning. If the
mower must be raised higher than 12” from ground
level, disengage the tractor PTO and wait for all
mower rotation to come to a complete stop before
proceeding to raise the mower. NEVER raise the
mower wings while the blades are turning.
When turning, the angle between the tractor and
mower should not be so great that a clattering of
the U-joints occurs.
Sharp turns can cause
premature failure of the joints and place pressure
on the tractor PTO shaft and could cause extensive
mechanical damage to the mower and tractor.
If the mower is operated in conditions that require
frequent sharp turning, the mower should be
equipped with a Constant Velocity driveline. CV
joints enable the tractor PTO shaft and mower
driveline to be angled safely up to 80 degrees with
no damage to the mower or driveline. OPS-R-0027

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)
Stay alert and watch for trees, low hanging limbs,
power lines, and other overhead obstacles and solid
ground objects while you are operating. Use care
to avoid hitting these items. OPS-R-0028

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Operation Section 4-38

OPERATION
When mowing across uneven areas such as road shoulders, ditch edges, and other uneven terrain, position
mower so that one support wheel is near the highest point to prevent blades from cutting into gravel or dirt
which can cause rapid blade wear and extremely severe shock loads on the drivetrain resulting in rapid wear
or damage to these components. Blades contacting the ground may cause objects to be thrown out from
under the mower deck. Always avoid operating the mower at a height or position which may cause the blades
to contact the ground. Cutting into the berm or edge of the ditch will cause abnormal and accelerated blade
wear and possible blade component failure. OPS-R-0029

OPERATION

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OPERATION
11.6 Shutting Down the Implement

OPERATION

To shut down attached mower head, first bring the
tractor to a complete stop. Decrease engine RPM
to idle then disengage cutterhead. The mower head
will come to a complete stop within a suitable
amount of time. Do not engage or disengage the
cutterheads at a high RPM unless there is an
emergency situation.

Park the tractor on a level surface, place the
transmission in park or neutral and apply the
parking brake, lower the attached implement to the
ground, shut down the engine, remove the key, and
wait for all motion to come to a complete stop
before exiting the tractor. OPS-U- 0016

12. DISCONNECTING THE MOWER FROM THE TRACTOR
Before disconnecting the mower, the PTO must be disengaged and blade rotation at a complete stop. Move
the mower to a level storage location and lower the center section and both wings to the ground. If the mower
will be stored with the wings in the raised position, install both wing transport lock braces. If the mower is not
resting securely on the ground, block the mower up securely before attempting to disconnect it from the
tractor.
Use extreme care to keep feet and hands from under the mower and clear of any pinch points. OPS-R-0030
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 unhitch without using the Tongue Jack. The Tongue is very heavy. Attempting to lift
the Tongue without using the Tongue Jack could cause strains or other injury. Allowing the
tongue to fall suddenly and unexpectedly could result in crushing injury. Use the Tongue
Jack for lifting the Implement only. Overloading the Tongue Jack can cause failure with
possible serious bodily injury or even death. (STI-04)

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Operation Section 4-40

OPERATION

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OPERATION

When disconnecting the mower the tractor should
be completely shut down and secured in position.
Relieve hydraulic pressure by moving the control
levers back and forth several times. Lower the
parking jack and raise the mower until the tongue
clevis is no longer resting on the tractor drawbar
and is supported solely by the jack. The jack
should be in a near vertical position with the
ground and can be adjusted by loosening the
positioning nut and moving the jack up to 15
degrees in each direction. Also make sure that
the jack foot is securely resting at ground level or
securely supported by a block before raising the
mower.
Once the mower tongue is being
supported entirely by the jack, remove the hitch
bolt, locknut, and washers. Remove the hydraulic
hoses from the tractor and secure to the mower to
prevent contact with dirt.
After disconnecting the mower hitch, remove the
mower driveline from the tractor PTO shaft. Place
the driveline in its storage bracket to prevent it
from contacting mud or dirt which can contaminate
the universal joint bearings and shorten the life of
the driveline.
After the driveline has been removed from the
tractor, place the PTO master shield back in the
operating position. OPS-R-0031

OPERATION

13. MOWER STORAGE
It is recommended that the mower be stored with the center section and both wings fully lowered to ground
level. If the mower is stored with the wings in the raised position, select a level area and install wing transport
braces to prevent the wings from falling BEFORE disconnecting the mower hitch from the tractor.
Properly preparing and storing the mower at the end of the season is critical to maintaining its appearance
and to help ensure years of dependable service. The following are suggested storage procedures:
• Thoroughly clean all debris off the mower to
prevent damage from rotting grass and standing water.
• Lubricate all mower grease points and fill gearbox oil levels as detailed in the maintenance
section.
• Tighten all bolts and pins to the recommended
torque.
• Check the mower for worn and damaged
parts. Perform repairs and make replacements immediately so that the mower will be
ready for use at the start of the next season.
• Store the mower in a clean, dry place with the
mower housing resting securely on blocks or
at ground level.
• Keep the driveline yoke from sitting in water,
dirt and other contaminants.
• Use spray touch-up enamel where necessary
to prevent rust and maintain the appearance of
the mower.
It is critical that driveline clutches slip when an
obstacle or heavy load is encountered to avoid
mower and/or tractor damage. If the mower sits outside for an extended period of time or is exposed to rain
and/or humid air, the clutch lining plates must be inspected to ensure they are not frozen together from rust or
corrosion. If the mower has been exposed to such conditions, at the start of each mowing season, and any
time it is suspected that the slip clutch plates may be frozen together, readjust the slip clutch as detailed in
Seasonal Clutch Maintenance of the maintenance section in this manual. OPS-R-0032

14. TRANSPORTING THE TRACTOR AND IMPLEMENT
Inherent hazards of operating the tractor and implement and the possibility of accidents are not left behind
when you finish working in an area. Therefore, the operator must employ good judgement and safe operation
practices when transporting the tractor and implement between locations. By using good judgement and
following safe transport procedures, the possibility of accidents while moving between locations can be
substantially minimized. OPS-U- 0017

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Operation Section 4-42

OPERATION
Never allow children or other persons to ride on the Tractor or Implement.
Falling off can result in serious injury or death. (SG-10)

If the tractor’s hydraulic pump is not independent of
the tractor PTO, or if the tractor PTO has to be run
to have hydraulic power, disconnect the mower
driveline from the tractor PTO output shaft. Secure
the driveline to the mower deck to prevent driveline
damage or loss during transport. OPS-R-0034

Before transporting the tractor on a public roadway
or boarding a trailer for transport, the tractor brake
pedals should be locked together. Locking the
pedals ensures that both wheels brake
simultaneously while stopping, especially when
making an emergency stop.
Use extreme caution and avoid hard applications of
the tractor brakes when towing heavy loads at road
speeds. Never tow the implement at speeds
greater than 20 MPH (25 kph). OPS-U- 0018

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Operation Section 4-43

OPERATION

Before transporting the tractor and mower, idle the
tractor engine, disengage the PTO and wait for all
mower moving parts to come to a complete stop.
Once all mower parts are completely stopped, raise
the mower to transport height. NOTE: When
raising the mower, maintain at least 1” clearance
between the driveline and mower deck. If additional
mower deck height is needed for safe transport,
disconnect the driveline from the tractor and secure
its end to the mower deck. The mower can then be
raised to the maximum lift height.. OPS-R-0033

OPERATION
14.1 Tire and Wheels

OPERATION

Laminated Sectional Tires are designed for conditions where puncture proof performance is required and
the mower will not be transported for long distances on roadways. Transport speed for laminated tires should
not exceed 20 MPH. Excessive speed can cause damage to the machine and tire sections. Laminated tires
must be installed such that the rubber segments lay with the ground.

Foam Filled used Airplane Tires are ideal for conditions where a puncture proof tire is needed and the
mower is frequently transported between locations.
Pneumatic Tires Implement tires are ideal for frequent long distance towing, however, they are not puncture
proof and are not recommended for mowing brushy areas or other conditions that could damage the tires.
Check side wall of tire for proper inflation pressure. DO NOT over-inflate. OPS-R-0035

Tire Size and Matching requirements - Center Axle
Tire assemblies when mounted on center axle duals should always be within limits listed.
Laminated Tires - Maximum difference between tire diameters on a center axle should be 1/2 inch or less.
Foam Filled Airplane Tires - Maximum difference between tire diameters on a center axle should be 1 inch or
less.
When replacing a tire assembly on center axle always check diameters to make sure tires fall within allowed
range for maximum tire and wheel life. It may be necessary to move one or more tires from wing axles to
remain within size limit.

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Operation Section 4-44

OPERATION
14.2 Transporting on Public Roadways

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)
Never allow children or other persons to ride on the Tractor or Implement.
Falling off can result in serious injury or death. (SG-10)

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)
The SMV (Slow-Moving Vehicle) emblem is
universal symbol used to alert drivers of the
presence of equipment traveling on roadways at a
slow speed. SMV signs are a triangular bright
orange with reflective red trim for both easy day and
night visibility. Make sure the SMV sign is clean and
visible from the rear of the unit before transporting
the tractor and implement on a public roadway.
Replace the SMV emblem if faded, damaged, or no
longer reflective. OPS-U- 0020

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Operation Section 4-45

OPERATION

Extreme caution should be used when transporting the tractor and mower on public roadways. The tractor
must be equipped with all required safety warning features including a SMV emblem and flashing warning
lights to alert drivers of the tractor’s presence. Remember that roadways are primarily designed for
automotive drivers and most drivers will not be looking out for you, therefore, you must look out for them.
Check your side view mirrors frequently and remember that vehicles will approach quickly because of the
tractor’s slower speed. Be extremely cautious when the piece of equipment that you are towing is wider than
the tractor tire width and/or extends beyond your lane of the road.
Make sure that a proper size safety tow chain is secured between the tractor, flex arm and mower before
entering a public road. Secure the center section at a safe transport height by placing additional stroke control
spacers on the center axle cylinder and then lower the mower. Secure the mower wings in the raised position
with the transport lock braces. OPS-R-0036

OPERATION

Make sure that all tractor flashing warning lights,
headlights, and brake/tail lights are functioning
properly before proceeding onto public roads. While
newer model tractors have plenty of lighting to
provide warning signals and operating lighting, most
older models are only equipped with operating lights.
Consult an authorized tractor dealer for lighting kits
and modifications available to upgrade the lighting on
older tractor models. OPS-U- 0021

When operating on public roads, have
consideration for other road users. Pull to the side
of the road occasionally to allow all following traffic
to pass. Do not exceed the legal speed limit set in
your country for agricultural tractors. Always stay
alert when transporting the tractor and implement
on public roads. Use caution and reduce speed if
other vehicles or pedestrians are in the area. OPSU- 0022

Reduce speed before turning or applying the brakes.
Ensure that both brake pedals are locked together
when operating on public roads. OPS-U- 0023

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Operation Section 4-46

OPERATION
14.3 Hauling the Tractor and Implement
Before transporting a loaded tractor and implement,
measure the height and width dimensions and gross
weight of the complete loaded unit. Ensure that the
load will be in compliance with the legal limits set for
the areas that will be traveled through. OPS-U- 0024

Arrange the chains so that when tightened, the
chains are pulling downward and against
themselves. Carefully tighten the securing chains or
other fasteners using boomers or binders to apply
maximum tension.
Use extreme care when
attaching and removing the securing devices as the
extreme tension involved when released has the
potential to inflict serious injury.
While hauling the tractor and implement, make
occasional stops to check that the tractor and
implement have not moved or shifted and that the
securing chains have maintained tension. If during
transport a hard braking, sharp turning, or swerving
action was performed, stop at the next safe location
to inspect the security of the load. OPS-U- 0026

FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Operation Section 4-47

OPERATION

Use adequately sized and rated trailers and
equipment to transport the tractor and implement.
Consult an authorized dealer to determine the proper
equipment required. Using adequately sized chains,
heavy duty straps, cables and/or binders, securely tie
down both the front and rear of the tractor utilizing the
proper tie down locations as specified by the tractor
manufacturer. OPS-U- 0025

OPERATION
15. TROUBLE SHOOTING GUIDE
Possible Cause

Remedy

Excessive Vibrations

Check Gear box bolts.

Tighten if loose.

Check For loose nuts on
bladeholder and blades

Tighten If loose

Check for bent output shaft.
If shaft is bent oil will normally.
leak from the bottom seal.

Replace shaft if bent.

Check to see if blades are .
free swinging.

Free blades so they swing

Check for even wear on each .
blade tip. Were both blades
changed at the same time.

Weigh blades. Weight should be
within 1 oz. Always replace both blades

Blade Broken.

Replace blades, in sets.

Blade carrier bent.

Replace carrier.

Blade hub not properly
seated on shaft

Remove hub, check tapered spline
shaft, clean and replace.

New Blade or bolts matched

Replace blades or bolts in sets

Drivelines not phased

Replace Drivelines.

Low on lubricant.

Fill to level plug.

Improper type lubricant.

Replace with proper lubricant.

Excessive trash build-up .
around gear box

Remove trash.

Bearing or gears set up improperly

Consult your dealer.

Rough gears.

Run in or change gears.

Worn bearing.

Replace bearing

Damaged oil seal

Replace Seal.

Bent shaft.

Replace oil seal and shaft.

Shaft rough in oil seal area.

Replace or repair shaft.

Oil seal installed wrong.

Replace seal.

Oil seal not sealing in the housing.

Replace seal or use a sealant
on OD of seal.

Oil level too high.

Drain oil to proper level.

Sand hole in casting.

Replace castings or gear box.

Gasket damaged.

Replace gasket.

Bolts loose.

Tighten bolts.

Clutch linings badly worn or
plates warped.

Repair clutch per maintenance
section of manuals.

Too much power for clutch.

Reduce speed and materiall intake.

OPERATION

Problem

Gearbox Overheating

Gearbox Noisy
Gear Box Leaking

Clutch Slips Excessively

Operation Section 4-48

OPERATION

Blade Wears Too Fast

Oil on facings.

Replace facings.

Friction facings glazed.

Clean with emery cloth.

Cutting in sandy conditions.

Increase cutting height.

Cutting in rocky conditions.

Increase cutting height.

Soft "will fit" blades.

Use genuine Rhino HT blades.

Quick coupler not completely
connected.
Oil Squirting from Breather Vent Oil leaking by piston ring.
hole
(A small amount of leakage is
normal)

Not Cutting Clean

Streaking Conditions In Swath

Complete connection.
Do not carry cutter on cylinder.
(Use stroke collars)

Piston "O" ring worn

Replace piston "O" ring.

Cylinder wall scored or pitted.

Replace cylinder.

Wrong piston ring on piston.

Use correct piston rings.

Blades dull.

Sharpen or replace blades.

Blade rotation incorrect.

Use correct blade for carrier rotation.

Carrier RPM too low.

Use correct PTO speed and
check for correct gear box ratio.

Cutter not level.

Adjust machine.

Tires mashing down grass.

Move tires out of cutter overlap
area. Minimum 60" inside tires.

Ground speed too fast.

Reduce ground speed.

Blades locked back.

Free blades.

Blades riding up due to blade
bolt wear.

Replace blade bolts.

Conditions too wet for cutting.
Blades unable to cut that part of
grass pressed down by path of
tractor tires.

Allow grass to dry before cutting.
Slow ground speed of tractor but keep
engine running at full PTO rpm. Move
rear tires as wide as possible so wing
blades will pick up grass.

Dull Blades.

Sharpen or replace blades.

Height of cutter lower at rear

See Cutting Height Instructions.

or front.

FN20/FN14 NITRO 02/10

Check pressure.
Re-plumb valve.

Operation Section 4-49

OPERATION

Hydraulic Cylinder Will Not Op. Not enough pressure.
Valve not connected properly.

MAINTENANCE SECTION

MAINTENANCE
Before operating your Rotary Cutter, make sure it is properly lubricated and thoroughly inspected. Only a
minimum of time and effort is required to regularly lubricate and maintain this machine to provide long life and
trouble free operation.

MAINTENANCE

Always disengage the PTO before raising the Rotary Cutter for transporting or making
adjustments.

Lubrication
Do not let excess grease collect on or around parts, particularly when operating in sandy areas. The
illustrations below shows lubrication points. The chart gives the frequency of lubrication in hours, based on
normal operating conditions. Severe or unusual conditions may require more frequent lubrication (Figure MntR-0380).
Use Multi-Purpose Gear Oil P/N 00786250 when required in Gearbox. Use N.L.G.I #2 grease for all locations
designated with grease gun. Be sure to clean the fitting thoroughly before using grease gun. Failure to
maintain proper lubrication will result in damage to U-joints, gearbox, and/or driveshaft.

Maintenance Section 5-2

MAINTENANCE

Maintenance Section 5-3

MAINTENANCE
Tongue

MAINTENANCE

The Tongue Hitch Pins attach the Tongue to the Center Section and should be checked for signs of wear or
cracking. Replace as needed. The Drawbar 1” bolt fastens the cutter to the tractor Drawbar. When the cutter is
unhitched and this 1” bolt is removed, examine for signs of cracking wear. Replace the Drawbar 1” bolt at first
signs of either problem. Attach Safety Chain securely to cutter and tractor.

CENTER & WING GEARBOXES
The Gearboxes have been filled with lubricant to the proper level prior to shipment. However, you should check
the oil level using dipstick before operating, and frequently thereafter.
The gearbox should not require additional lubricant
unless the box is cracked or a seal is leaking. It is
recommended that the dipstick plug be checked
after every 8 to 10 hours of operation and oil added
until it reaches proper level. Dipstick Filler Plugs are
located on top of all Gearboxes. Mnt-R-0004.

Maintenance Section 5-4

MAINTENANCE
DIVIDER GEARBOX
The filler pressure relief Dipstick Plug is on top of the Gearbox. Mnt-R-0005.

Recommended lubricant for all gearboxes is Multi-Purpose Gear Oil P/N 00786250.
Many of the equipment components are HEAVY (70 lbs or greater) and Special Lifting
Procedures are recommended. Use lifting assistance such as mechanical assistance, two
people, and proper lifting techniques when connecting or installing the driveshaft to reduce
the possibility of back injuries.

Maintenance Section 5-5

MAINTENANCE

Do not over-fill. If Gearboxes are filled above proper, pressure under working conditions may
cause the Grease Seals to leak.

MAINTENANCE
DRIVELINES
The Drivelines and U-Joints should be inspected each morning before the mower is started.

MAINTENANCE

Many of the equipment components are HEAVY (70 lbs or greater) and Special Lifting
Procedures are recommended. Use lifting assistance such as mechanical assistance, two
people, and proper lifting techniques when connecting or installing the driveshaft to reduce
the possibility of back injuries.
The U-Joint and CV Joint on the Driveline undergo extreme forces when the unit is turning or when the Wings
are being raised. It is important that the CV Joint be greased before the unit is started. The U-Joints are located
at each end of the Center and Wing Drivelines. The CV Joint is located at the end of the Main Driveline. The UJoint and CV Joint assemblies are accessible by rotating the Driveline Safety Shield until the hole in the Shield
matches up with the Grease Fitting. Use #2 Bearing Grease for lubrication. Inspect the U-Joint for wear by
holding the shaft on one side of the U-Joint while trying to rotate the shaft on the other side of the U-Joint. If
there is noticeable movement in the Driveline replace the U-joint before it causes severe damage to the
Driveline,

EXTENDED LUBE
INTERVAL
LOCATION
Cross & Bearings
50 Hours
Telescoping Tube
50 Hours
CV Ball & Socket
50 Hours
CV Center Housing
50 Hours
CE & Non-Rotating Guard Bushings (1000 RPM Max) 50 Hours
FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Maintenance Section 5-6

LEVER
ACTION PUMPS
2-3
8 - 10
4-6
12 - 15
2

MAINTENANCE
MAIN CV DRIVELINE SHIELD SERVICE INSTRUCTIONS

2.
3.
4.

Clean and grease bushing groove before the bushing is placed in the groove. Grease any remaining
bushings in guard.
Slide guard half over driveline and insert bushing tabs into the openings in the guard.
Turn the bushing until it engages into the guard.
Push Easy Lock clip into position. The bushing and guard are now secure.

TO REMOVE GUARD - Use screwdriver to release Easy Lock clip. Turn the bushing to disengage
from the guard and remove guard. Figure Mnt-R-0359

MPORTANT! Check that Guard Missing decal on steel tube under inner guard
and Rotating Driveline Decal are firmly affixed, undamaged and readable. If not,
replace.

Maintenance Section 5-7

MAINTENANCE

TO DISASSEMBLE UNIVERSAL
JOINT
1.

Remove all snap rings.

Position joint in loose vice, strike top arm of
unsupported yoke to drive the top cup up.
Repeat on opposite side.

If you cannot grip the loosened cap per
Step 4, use a pointed tool to tip a needle
them repeat Step 2.

Grip loosened cup in vise, strike yoke arm
to drive yoke off cup. Repeat on opposite
cup.

Support cross in loose vise and strike yoke
arm. Repeat Step 4 to remove remaining
two cups.

Maintenance Section 5-8

MAINTENANCE
TO REASSEMBLE UNIVERSAL JOINT
1.

Smear grease into bearings and check for
dirt.
CAUTION! Make sure all needle bearings are
seated properly.

Insert cup and cross. Drive in with spacer.

Insert snap ring

Insert second cup and hold cross into cup.
Drive cup flush with arm.

Maintenance Section 5-9

MAINTENANCE

MAINTENANCE
5.

Drive cup down with spacer and insert snap
ring

To loosen cross, strike yoke arm and check
cross for free rotation

Position second yoke on cross. Repeat
Steps 2 to 6.

Grease Kit after assembly is completed.

Maintenance Section 5-10

MAINTENANCE
DISASSEMBLY - CROSS AND BEARING KIT
The implement driveline has been removed
from the machine, the two halves
separated, and the guards removed. Start
the procedure by removing the yoke that
does not have a shaft attached.

The bearing cups are held in the center
housing by snap rings. The snap rings are
on either the inner edge of the bearing cup
(internal), or on the cup end (external).
For internal snap rings, put a shop cloth
under the snap ring to catch the snap ring.
Use a screwdriver and a hammer to drive
the snap ring off the bearing cup. Figure
MntP-R-0128
For external snap rings, the snap rings are
against the outer end of the bearing cup.
Use a hammer and a driver (that is slightly
smaller than the bore) to lightly hit the snap
ring. Figure MntP-R-0129 and MntP-R0130 This will drive the bearing cup away
from the snap ring and loosen the snap
ring. Remove the snap ring.

Set the end yoke on the vise so the ears
are supported by the jaws of the vise. Hit
the center housing to force the bearing cup
out of the center housing. Figure MntP-R0131 The bearing cup will only be forced
part way out of the center housing. Note:
When hitting the center housing NEVER hit
the machined surface of the center
housing. If the machined area is damaged,
the guard will not rotate freely. NEVER hit
the area around the hole for the bearing
cup. Distortion of the hole will make
removal of the bearing cup difficult.

Repeat the procedure to push the other
bearing cup part way out of the center
housing.

Fasten one of the bearing cups in the vise.
Make sure the jaws of the vise are as close
to the center housing as possible. hit the
center housing to drive the center housing
up off the bearing cup. Be careful not to hit
the machined surface of the center
housing. Figure MntP-R-0132 Do not
remove the other bearing cup from the
center housing at this time.

Maintenance Section 5-11

MAINTENANCE

MAINTENANCE
6.

Note the orientation of all grease fittings
before removing any yokes or crosses.
Remove the end yoke from the center
housing.

Repeat steps 2 - 6 to remove the shaft yoke
and cross from the center housing.

Use the hammer and the driver to remove
the two bearing cups from the center
housing. Figure MntP-R-0133

Remove the snap rings from the end yoke
and the shaft yoke. (Refer to Step2)

10.

Set the end yoke on the vise so the
trunnions of the cross are supported by the
jaws of the vise. Hit the end yoke to force
the bearing cup out of the end yoke. The
bearing cup will only be forced part way out
of the end yoke. Note: When hitting the end
yoke NEVER hit the area around the hole in
ear. Distortion of the hole will make removal
of the bearing cup difficult. Figure MntP-R0134

11.

Repeat step 10 to push the other bearing
cup part way out of the end yoke.

12.

Fasten one of the bearing cups in the vise.
Make sure the jaws of the vise are as close
to the end yoke as possible. Hit the end
yoke to drive the yoke up off the bearing
cup, similar to Step 5.

13.

Repeat Step 12 to remove the other
bearing cup from the end yoke.

14.

The opening between the ears on the end
yoke is wider on one side. Remove the
cross from the side that has the wider
opening.

15.

Repeat Steps 10 - 14 to remove the cross
from the shaft yoke. Be careful not to hit the
grease fitting in the shaft yoke.

Maintenance Section 5-12

MAINTENANCE
INSPECTION
Discard the two crosses, all of the bearing
cups, and all of the snap rings.

Clean the bores in the center housing and
the yokes. Inspect the bores for damage.
Replace any parts that are damaged.

Clean the snap ring grooves in the bores
that have them. Inspect the snap ring
grooves for damage. Replace any parts that
are damaged.

Clean the trunnions of the center plate in
the center housing. Make sure that none of
the needles from the bearings have fallen
into the center plate area of the center
housing. Make sure center plate moves
freely by hand.

Make sure the grease fitting in the center
housing is clean, unobstructed, and
undamaged. Replace this if necessary.
Figure MntP-R-0135

Inspect the ball in the end yoke and the ball
in the shaft yoke for scoring and damage.
Check the end play of the balls. The end
play must not be more than 0.025 in
(0.635mm). If the ball is worn, replace the
yoke. Figure MntP-R-0136

Use your finger to check for grease in the
ball in the end yoke and the ball in the shaft
yoke. If there is no grease in the ball, the
ball has not been receiving grease. Also
check the ball color. If it is blue, the ball has
not been receiving grease. Check the
grease fitting and the grease passages in
the shaft yoke. Figure MntP-R-0137 If they
cannot be cleared, replace the yoke and
shaft.

Maintenance Section 5-13

MAINTENANCE

ASSEMBLY
1.

Apply grease to the bearing cup bores in
the end yoke, the shaft yoke, and the center
housing. The grease will make the bearing
cups much easier to install.

Install the grease fittings in the crosses.
Align the grease fitting with the correct
trunnions. Look at the old crosses. Figure
MntP-R-0138

Remove the bearing cups from the new
crosses and apply grease to the needle
rollers in the bearing cups. The grease is
used to hold the needle rollers in the
bearing cups during installation. Use your
finger to push the grease into the needle
rollers and to push the needles out against
the bearing cup. Figure MntP-R-0139

Wrap the shaft in a shop cloth to protect the
splines, and mount it in the vise with the
yoke up. Make sure the trunnions of the
new cross are clean. Install the correct
trunnions of the cross through the side of
the shaft yoke that has the widest opening.
The grease fitting in the cross must be
away from the ball in the shaft yoke. Figure
MntP-R-0140

Push the cross to one side of the yoke. Use
the trunnion as a pilot and push the new
bearing cup onto the cross and into the
opening in the rear.

Push the cross into the bearing cup to keep
the needles in the bearing cup while driving
the bearing cup. Keep the trunnions of the
cross parallel with the openings for the
bearing cups. Hit the bearing cup lightly
with a hammer. Using the vise, drive the
bearing cup into the yoke until the bearing
cup is flush with the yoke.

Make sure the bearing cup is flat against
the bench. Keep the cross in the bearing
cup and start the other bearing cup into the
yoke. Use a hammer to lightly drive the
bearing cup into the yoke just far enough to
make sure the bearing cup is straight. If the
grease fitting in the yoke is down, support
the yoke on a block to prevent damage to
the grease fitting.

Maintenance Section 5-14

MAINTENANCE
Put the shaft yoke into the vise so the
bearing cups are square with the jaws of
the vise. Make sure the trunnion is aligned
with the baring cups. Tighten the vise until
both bearing cups are flush with the yoke.
Figure MntP-R-0141

Using the large driver used in disassembly,
drive one of the bearing cups into the yoke
until the groove for the snap ring can be
seen. Make sure the ear of the yoke is flat
against the bench. If the grease fitting in the
yoke is down, support the yoke on a block
to prevent damage to the grease fitting.

10.

Make sure the groove for the snap ring is
clean. Install the snap ring. Use a
screwdriver to push the snap ring into the
groove all the way around.

11.

Set the shaft yoke on the vise so the
shoulders of the cross are supported by the
jaws of the vise. DO NOT allow the
machined surfaces to contact the vis. Hit
the yoke with the hammer to seat the
bearing cup against the snap ring. DO NOT
hit the yoke near the opening for the
bearing cup. Figure MntP-R-0142

12.

Repeat Step 9 - 11 for the other snap ring.

13.

Repeat Steps 1 - 12 for the end yoke.

14.

Wrap a shop cloth around the shaft to
protect the splines. Clamp the shaft in the
vise so the so that shaft yoke is up. The ball
in the shaft yoke has a flat area around
each end of the hole. The flat area is wider
on one side of the ball. Figure Mnt-R-0369
Rotate the ball so the wider flat area is up.

15.

Rotate the center housing so the grease
fitting is away from the shaft yoke. This will
align the grease fitting the center housing
with the hole in the guards. The grease
fittings In the center housing and the cross
must be toward the same side of the
assembly. Make sure the pin of the center
plate in the center housing is clean. Install
the pin in the ball and cross in the ears of
the center housing. Figure MntP-R-0143

16.

Make sure there is grease in the holes for
the bearing cups in the center housing.
Push the cross to one side of the yoke.

Maintenance Section 5-15

MAINTENANCE

MAINTENANCE
17.

Use the cross trunnion as a pilot. Start the
new bearing cup on the cross and into the
opening in the center housing. Push the
cross into the bearing cup while driving the
trunnions of the cross parallel with the
openings for the bearing cups. Hit the
bearing cup lightly with a hammer. Using
the vise, drive the bearing cup into the yoke
until the bearing cup is flush with the yoke
ear. Figure MntP-R-0144

18.

Keep the cross in the bearing cup and start
the other bearing cup into the center
housing. Use a hammer to drive the bearing
cup into the yoke just far enough to make
sure the bearing cup is straight.

19.

Put the center housing into vise so the
bearing cups are square with the jaws of
the vise. make sure the trunnions are
aligned with the bearing cups. Tighten the
vise until both bearing cups are flush with
the ears. Make sure the needle rollers do
not fall out of the bearing cups. Figure
MntP-R-0145

20.

Using the driver and hammer, drive one of
the bearing cups into the center housing
until the groove for the snap ring can be
seen on the bearing cup.

21.

Install the snap ring. Make sure the snap
ring is seated in the groove all the way
around.

22.

Repeat Steps 20-21 for the other snap ring.

23.

Set the shaft yoke on the vise so the ears of
the shaft yoke are supported by the jaws of
the vise. Carefully hit the center housing
with the hammer to seat the bearing cup
against the snap ring. DO NOT hit the
center housing on the machined surface or
near the opening for the bearing cup.
Figure MntP-R-0146

24.

Turn the shaft yoke over in the vise.
Carefully hit the center housing with the
hammer to seat the other bearing cup
against the snap ring.

25.

Repeat Steps 14-24 for the end yoke.
Figure MntP-R-0147

26.

Apply grease to the fittings in the crosses
until grease comes from the seals. Apply
ten pumps to the fitting on the shaft yoke
supplying the ball sockets. Apply ten pumps
to the fitting on the center housing,
supplying the center plates.

27.

Clean the shaft and sleeve splines and
grease them.

Maintenance Section 5-16

MAINTENANCE
BLADE SERVICING
Inspect blades before each use to determine that they are properly installed and in good condition. Replace
any blade that is bent, excessively nicked, worn, or has any other damage. Small nicks can be ground out
when sharpening.
Use only original equipment blades on this cutter. They are made of special heat-treated
alloy steel. Substitute blades may not meet specifications and may fail in a hazardous
manner that could cause injury.

•
•
•

Manually wiggle the glade carriers to check for any looseness.
Retighten any loose parts.
Recheck torque every 50 hours.
Operating with loose blade hardware will damage the blade holder and blades. Whenever
the blades have been removed or replaced, the hardware must be retightened after the first
eight hours of operation. On new units check blade hardware and the blade nut torque after
first 8 hours.
Operating with loose blade holder will damage the blade holder and output shaft, two initial
tightenings are required. Retighten after one hour and again after the day of operation. In
severe cutting conditions or commercial use, a daily inspection is required.
To help prevent structural damage caused by loose hardware, tighten gear case hardware
as specified. Check torque after first 8 hours of use and every 50 hours thereafter.
Inspect Blades daily for abnormal wear. If Blades have a notch worn into the leading edge at
the lower bend more than a 1/2” DEEP (due to running in gravel and/or the ground),
REPLACE BOTH BLADES ON THAT CARRIER IMMEDIATELY. Failure to replace such
abnormally worn blades may lead to catastrophic failure of the blade and ejection of the
broken part with tremendous force which may cause bodily injury or death.

NOTE: Replace Blades in pairs after no more than 1/2" notch wear!

Maintenance Section 5-17

MAINTENANCE

Replace bent or broken blade with new blades. NEVER ATTEMPT TO STRAIGHTEN OR
WELD ON BLADES SINCE THIS WILL LIKELY CRACK OR OTHERWISE DAMAGE THE
BLADE WITH SUBSEQUENT FAILURE AND POSSIBLE SERIOUS INJURY FROM
THROWN BLADES. (SGM-10)

MAINTENANCE
BLADE SHARPENING

MAINTENANCE

Always sharpen both blades at same time to maintain balance. Follow original sharpening pattern as shown in
FIGURE Mnt-R-0008. Always sharpen blades by grinding. DO NOT heat and pound out edge. Do not sharpen
blade to a razor edge, but leave a 1/16" blunt edge. Do not sharpen back side of blade.
IMPORTANT: When sharpening blades, grind each blade the same amount to maintain balance. The
difference in blade weights should not exceed 1 ounce. Unbalanced blades will cause excessive vibration
which can damage gear box bearings. Vibration may also cause structural cracks in cutter housing.
Never work under equipment supported by a hydraulic device because it may drop if the
control is actuated (even with the engine stopped) or in the event of hose failure, etc. Always
use a secure support for equipment which must be serviced while in the raised position.

NOTE: Replace Blades in pairs after no more than 1/2" notch wear!

BLADE REMOVAL
To remove blades for sharpening or replacement,
remove the cover plate on deck of cutter near gear
box. Remove lock nut from blade bolt (left hand
threaded bolt). NOTE: Inspect lock nut after removal
and replace if threads are damaged. Always replace
nut when replacing blade bolt. When installing
blades be sure and check blade bolt pivot diameter
for wear. Replace bolt if worn more than 1/4 inch at
any point. See Figure Mnt-R-0014. Install blade
bolts with partially worn side of bolt either toward or
away from center. Tighten lock nut to 300 ft. lbs.
Avoid personal injury. Blade and/or blade carrier removal should be done only with the
tractor engine shut off, key removed, in neutral, parking brake on, PTO disengaged, and the
cutter blocked in the raised position.

Maintenance Section 5-18

MAINTENANCE
BLADE CARRIER INSPECTION

Failure to replace a worn blade carrier bushing as described above may lead to catastrophic
failure of the blade, blade bolt, and/or blade bolt nut resulting in the ejection of the broken
parts out from under the mower at tremendous speed and force which could result in serious
bodily injury or death.

Maintenance Section 5-19

MAINTENANCE

Blade bolt fit into carrier bushings should be checked every time blades are changed. The blade bolt should fit
into carrier bushings as a snug slip fit. If the blade bolt fit appears to be loose or sloppy, measure the square
hole in bushing. If the bottom of the square hole is 1/16” or greater than the square shoulder of the new blade
bolt the bushings should be replaced. Bushings can be removed by cutting bushing head where it is welded to
carrier bar. Once head is removed bushing can be pressed out of bar. Clean and grind top of blade bar so new
bushing can be installed and welded. Bushing should be pressed into bar as far as possible. Use low hydrogen
rod to weld bushing in place.

MAINTENANCE
BLADE CARRIER INSTALLATION

MAINTENANCE

Clean the taper and keyway on both the blade carrier and output shaft. Position carrier on the gear box output
shaft and install flat washer and 1" hex nut. Tighten the nut holding the blade carrier to minimum 600 ft.
pounds. Strike the carrier on the hub several times with a heavy hammer to seat the hub. Use a suitable spacer
over the nut to prevent damage to the nut and threads. Retighten the nut to 600 ft. pounds. Install and spread
cotter pin.
Operating the mower with a loose blade pan or holder can damage the taper connection on
the gearbox output shaft. To ensure proper seating between the blade holder and output
shaft check and tighten the retaining nut after the first day of operation. Recheck the blade
carrier attachment each morning before operating. Grasp the carrier firmly with both hands
and try to push and pull the carrier with one hand while pulling and pushing with the other
hand to try to rock or oscillate the blade carrier. If the carrier is loose retighten the retaining
nut before operating the mower.

NOTE: After a few hours of operation always recheck blade carrier retaining nut torque.
Avoid personal injury. Do not work under cutter without support blocks to keep frame from
falling.

TORQUE LIMITER
Avoid overheating of the Torque Limiter by too long or too frequent slipping since this can damage the friction
plates and limiter parts. When checking the Torque Limiter for overheating, DO NOT touch with hand. It could
be extremely hot and cause severe burn.
If an adjustment is required, this may be done in the field by following the procedure outlined below. Following
these instructions will give maximum rated torque and long life.
(a) With the three Capscrews (#8) backed out until the points are below the surface of the circular
Nut (#7), run Adjusting Nut up finger-tight.

Adjusting

(b) Alternately tighten the hardened, cup point Capscrews (#8) no more than one-half turn at a time until the
Capscrew heads "Bottom Out". Do not over tighten the Capscrews nor completely flatten the Spring Washers
(#5).
If the Hub is removed from the Shaft for any reason, the Shaft and Hub should be coated with a heavy grease
before reassembly to prevent Hub from freezing to Shaft.

SEASONAL TORQUE LIMITER MAINTENANCE
It is important that the Torque Limiter slips when an obstacle or load heavier than the setting is encountered.
Before using the Torque Limiter each season, use the following procedure to make sure it will slip and give the
overload protection required.
Loosen Bolts (#8) until gap between adjusting nut (#7) and guide ring is approximately 1/16".
Attach machine to tractor, set engine at approximately half throttle and quickly engage PTO. This procedure
will break clutch facings loose and allow the proper torque to be maintained.
FN20/FN14 NITRO 02/10
© 2010 Alamo Group Inc.

Maintenance Section 5-20

MAINTENANCE
Return the bolts to their original position as described in (b) above.

TORQUE LIMITER REPAIR PROCEDURE
6.

Remove two bolts from top cover plate which holds shield bracket to gear box.

Remove locknuts #11 from bolts #12.

Remove cotter pin #13, castle nut #14, and washer #15. NOTE: It may be necessary to rotate yoke to
remove cotter pin. Remove driveline yoke from shaft.

Loosen three bolts #8 until large nut #7 maybe removed from hub #1.

10.

Remove all parts from hub #1.

11.

Clean or sand outer plates #2 and center plate #4 to remove rust or burned lining material from plates.

12.

Reassemble clutch as shown in Mnt-R-0022 replacing parts as necessary.

13.

Install driveline yoke onto shaft and install four bolts through yoke spacers #10 and center plate #4.
Install locknuts and tighten.

14.

Rotate yoke and center plate so that cotter pin #13 can be installed.

15.

Tighten large nut #7 as much as possible by hand. NOTE: Make sure all springs #5 are centered on
guide ring #6.

Maintenance Section 5-21

MAINTENANCE

NOTE: If machine sits outside longer than 30 days
and is exposed to rain and humid air, the Torque
Limiter should be removed from machine and
stored in a dry area. Torque Limiter facings will soak
up moisture and cause the metal plates to rust
badly. When this occurs, the break-away torque
increases greatly and damage to gearbox, driveline,
or tractor PTO can occur.

MAINTENANCE
Reinstall washer #15 and castle nut #14.
CAUTION: Do not tighten nut #14. Tighten
only enough to remove play between the
yoke, washer #15, and nut #14. Install
cotter pin.

MAINTENANCE

16.

Maintenance Section 5-22

MAINTENANCE
GEARBOX ARRANGEMENTS (Secondary Gearboxes)

Maintenance Section 5-23

MAINTENANCE

All Three secondary Gearboxes have the same identical parts in them for 540 or 1000 RPM and for the left,
center, or right sections. To change Gearbox from 540 to 1000 RPM, the Gear (#1) and Pinion (#2) must be
reversed. Remove the Gear from the Cross Shaft and the Pinion from the vertical Output Shaft. Install the Gear
on the vertical output shaft and the pinion on the Cross Shaft. Reassemble the Gearbox allowing .008 to .012
backlash. Repeat this procedure on all three Gearboxes. When removing the Bearings and Gears, do not mar
the Grease Seal Race. Be extremely careful when installing the Grease Seals so they will not be damaged.

MAINTENANCE
HYDRAULIC HOSES

MAINTENANCE

Replace pinched and broken Hydraulic Hoses at once. Tighten any Hydraulic Fitting with fluid leaking from it. If
fluid still leaks, loosen the fitting, apply a pipe thread compound to the threads and tighten. Care must be
exercised when tightening Hydraulic Fittings. Too much tightening can cause the fittings to crack and require
replacement fittings.
Although a small amount of oil will be present from bleeding at all Hydraulic Fittings, significant amounts of oil
leaking around the Breather Plug on the Cylinder indicates that the seal in the Cylinder is worn out. Replace
the seals in the Cylinder immediately before the Cylinder is damaged or too much hydraulic fluid is lost.

SKID SHOES
Skid shoes are made of carbon steel to reduce wear and increase service life. Premature wear can be caused
by the cutter Wing sections being set too low which allows the Wing Skid Shoes to drag on the ground.
Dragging the Skid Shoes on the ground or running the Skid Shoes into solid objects can contribute to early
frame failure on the cutter. Replace worn Skid Shoes as required.

HARDWARE
Check nuts, bolts, and other miscellaneous hardware regularly. Loose hardware is easily lost, causes
increased wear on parts, and increases the chance of breakdown. Loose hardware creates potential hazards
which could result in personal injury to the operator, support personnel, and bystanders. Use the “Torque
Chart” below when tightening bolted connections.

Maintenance Section 5-24

MAINTENANCE
PROPER TORQUE 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*

Maintenance Section 5-25

MAINTENANCE

NOTE: These values apply to fasteners as received from supplier, dry or when lubricated with normal engine
oil. They do not apply if special graphited or molydisulphide greases or other extreme pressure lubricants are
used. This applies to both UNF fine and UNC coarse threads.

RHINO

LIMITED WARRANTY
1.

LIMITED WARRANTIES

1.01.

Servis-Rhino warrants for one year from the purchase date to the original non-commercial, governmental, or municipal purchaser
(“Purchaser”) and warrants for six months to the original commercial or industrial purchaser (“Purchaser”) that the goods purchased
are free from defects in material or workmanship.

1.02.

Manufacturer will replace for the Purchaser any part or parts found, upon examination at one of its factories, to be defective under
normal use and service due to defects in material or workmanship.

1.03.

This limited warranty does not apply to any part of the goods which has been subjected to improper or abnormal use, negligence,
alteration, modification, or accident, damaged due to lack of maintenance or use of wrong fuel, oil, or lubricants, or which has
served its normal life. This limited warranty does not apply to any part of any internal combustion engine, or expendable items such
as blades, shields, guards, or pneumatic tires except as specifically found in your Operator’s Manual.

1.04.

Except as provided herein, no employee, agent, Dealer, or other person is authorized to give any warranties of any nature on behalf
of Manufacturer.

REMEDIES AND PROCEDURES.

2.01.

This limited warranty is not effective unless the Purchaser returns the Registration and Warranty Form to Manufacturer within 30
days of purchase.

2.02.

Purchaser claims must be made in writing to the Authorized Dealer (“Dealer”) from whom Purchaser purchased the goods or an
approved Authorized Dealer (“Dealer”) within 30 days after Purchaser learns of the facts on which the claim is based.

2.03.

Purchaser is responsible for returning the goods in question to the Dealer.

2.04.

If after examining the goods and/or parts in question, Manufacturer finds them to be defective under normal use and service due to
defects in material or workmanship, Manufacturer will:
(a)Repair or replace the defective goods or part(s) or
(b)Reimburse Purchaser for the cost of the part(s) and reasonable labor charges (as determined by Manufacturer) if Purchaser
paid for the repair and/or replacement prior to the final determination of applicability of the warranty by Manufacturer.

The choice of remedy shall belong to Manufacturer.

2.05.

Purchaser is responsible for any labor charges exceeding a reasonable amount as determined by Manufacturer and for returning
the goods to the Dealer, whether or not the claim is approved. Purchaser is responsible for the transportation cost for the goods or
part(s) from the Dealer to the designated factory.

LIMITATION OF LIABILITY.

3.01.

MANUFACTURER DISCLAIMS ANY EXPRESS (EXCEPT AS SET FORTH HEREIN) AND IMPLIED WARRANTIES WITH
RESPECT TO THE GOODS INCLUDING, BUT NOT LIMITED TO, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE.

3.02.

MANUFACTURER MAKES NO WARRANTY AS TO THE DESIGN, CAPABILITY, CAPACITY, OR SUITABILITY FOR USE OF THE
GOODS.

3.03.

EXCEPT AS PROVIDED HEREIN, MANUFACTURER SHALL HAVE NO LIABILITY OR RESPONSIBILITY TO PURCHASER OR
ANY OTHER PERSON OR ENTITY WITH RESPECT TO ANY LIABILITY, LOSS, OR DAMAGE CAUSED OR ALLEGED TO BE
CAUSED DIRECTLY OR INDIRECTLY BY THE GOODS INCLUDING, BUT NOT LIMITED TO, ANY INDIRECT, SPECIAL,
CONSEQUENTIAL, OR INCIDENTAL DAMAGES RESULTING FROM THE USE OR OPERATION OF THE GOODS OR ANY
BREACH OF THIS WARRANTY. NOT WITHSTANDING THE ABOVE LIMITATIONS AND WARRANTIES, MANUFACTURER’S
LIABILITY HEREUNDER FOR DAMAGES INCURRED BY PURCHASER OR OTHERS SHALL NOT EXCEED THE PRICE OF
THE GOODS.

3.04.

NO ACTION ARISING OUT OF ANY CLAIMED BREACH OF THIS WARRANTY OR TRANSACTIONS UNDER THIS
WARRANTY MAY BE BROUGHT MORE THAN TWO (2) YEARS AFTER THE CAUSE OF ACTION HAS OCCURRED.

MISCELLANEOUS.

4.01.

Proper Venue for any lawsuits arising from or related to this limited warranty shall be only in Guadalupe County, Texas.

4.02.

Manufacturer may waive compliance with any of the terms of this limited warranty, but no waiver of any terms shall be deemed to be
a waiver of any other term.

4.03.

If any provision of this limited warranty shall violate any applicable law and is held to be unenforceable, then the invalidity of such
provision shall not invalidate any other provisions herein.

4.04.

Applicable law may provide rights and benefits to purchaser in addition to those provided herein.

KEEP FOR YOUR RECORDS
ATTENTION: Purchaser should fill in the blanks below for his reference when buying repair parts and/or for proper machine identification when
applying for warranty.
Servis-Rhino Implement Model

Serial Number

Date Purchased

Dealer

ATTENTION:
READ YOUR OPERATOR'S MANUAL

RHINO®
1020 S Sangamon Ave.
Gibson City, IL 60936
800-446-5158
Email: parts@servis-rhino.com

TO THE OWNER/OPERATOR/DEALER

In addition to the standard Limited Warranty shown on the facing page, Rhino also provides:
1. A FIVE-YEAR (60 months) LIMITED WARRANTY* on GEARBOX components provided they have been
properly maintained† and have not been subjected to abuse or mis-use except as limited below.
* WARRANTY LIMITATIONS - GEARBOX
A. Warranty is ONE-YEAR (12 MONTHS) for Seals (After one year, seals are considered to be WEARING
PARTS and replacement is the users' responsibility.)
B. Users' Gearboxes may be rebuilt by Rhino or replaced by new or rebuilt Gearboxes at the option of
Rhino.
2. TWO-YEAR (24 months) LIMITED WARRANTY** on the DRIVELINE components provided they have
been properly maintained† and have not been subjected to abuse or mis-use.
* *WARRANTY LIMITATIONS - DRIVELINE
A. Warranty is ONE-YEAR (12 MONTHS) for DRIVELINE SHIELDS except that evidence of wear from
contact with other parts on the shield voids this warranty.
B. Shield Bearings are wearing parts and are not warrantable.
C. Slip-Clutch Disks are wearing parts and are not warrantable. Evidence of "burning up" Slip Clutch Plates
due to improper adjustment will void warranty on Slip Clutch Parts.
† NOTE - "properly maintained" specifically includes, but is not limited to:
A. Running Gearboxes with the proper amount of the correct lubricant.
B. Adjusting Slip Clutches correctly to provide proper protection for Driveline and Gearbox Components.
C. Properly lubricate al driveline components as specified.
D. Maintaining proper bearing preload on all gearbox shafts.
To keep your implement running efficiently and safely, read your manual thoroughly and follow these directions
and the Safety Messages in this Manual. The Table of Contents clearly identifies each section where you can
easily find the information you need.
The OCCUPATIONAL SAFETY AND HEALTH ACT (1928.51 Subpart C) makes these minimum safety
requirements of tractor operators:
REQUIRED OF THE OWNER:
1. Provide a Roll-Over-Protective Structure that meets the requirements of this Standard; and
2. Provide Seat belts that meet the requirements of this paragraph of this Standard and SAE J4C; and
3. Ensure that each employee uses such Seat belt while the tractor is moving; and
4. Ensure that each employee tightens the Seat belt sufficiently to confine the employee to the protected area
provided by the ROPS
REQUIRED OF THE OPERATOR:
1. Securely fasten seat belt if the tractor has a ROPS.
2. Where possible, avoid operating the tractor near ditches, embankments, and holes.
3. Reduce speed when turning, crossing slopes, and on rough, slick, or muddy surfaces.
4. Stay off slopes too steep for safe operation.
5. Watch where you are going - especially at row ends, on roads, and around trees.
6. Do not permit others to ride.
7. Operate the tractor smoothly - no jerky turns, starts, or stops.
8. Hitch only to the drawbar and hitch points recommended by the tractor manufacturer.
9. When the tractor is stopped, set brakes securely and use park lock, if available.

FN20/FN14 NITRO
HEAVY-DUTY FLEX WING
ROTARY CUTTER
FN20/FN14-SOM-02/10
Printed U.S.A

P/N 00778645C

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