Kubota GR2020G, GR2120, GR2120AU Operators Manual
OPERATOR'S MANUAL
AS . D . 1 - 1 . - . AK
Code No. K1270-7122-1
MODELS
GR2020G
GR2120
GR2120AU
G
R
2
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G
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2
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G
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A
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1BDAHAOAP0580
PRINTED IN U.S.A.
KUBOTA Corporation 2014
©
READ AND SAVE THIS MANUAL
ABBREVIATION LIST
Abbreviations Definitions
API
PTO
PT
rpm
SAE
KRA
American Petroleum Institute
Power Take Off
Permanent Type (=Ethylene glycol anti-freeze)
Revolutions Per Minute
Society of Automotive Engineers
Kubota Reverse Awareness System
UNIVERSAL SYMBOLS
As a guide to the operation of your tractor, various universal symbols have been utilized on the instruments and
controls. The symbols are shown below with an indication of their meaning.
Safety Alert Symbol
Gasoline Fuel
Diesel Fuel
Coolant Temperature
Mower-Lowered position
Mower-Raised position
KUBOTA Corporation is ···
Since its inception in 1890, KUBOTA Corporation has grown to
rank as one of the major firms in Japan.
To achieve this status, the company has through the years
diversified the range of its products and services to a remarkable
extent. Nineteen plants and 16,000 employees produce over 1,000
different items, large and small.
All these products and all the services which accompany them,
however, are unified by one central commitment. KUBOTA makes
products which, taken on a national scale, are basic necessities.
Products which are indispensable. Products which are intended to
help individuals and nations fulfill the potential inherent in their
environment. KUBOTA is the Basic Necessities Giant.
Brake
Parking Brake
Engine-Stop
Engine-Run
Preheat
Starter Control
Power Take-Off Clutch Control-Off Position
Power Take-Off Clutch Control-On Position
Cutting Height
California Proposition 65
WARNING
Engine exhaust, some of its constituents,
certain vehicle components and fluids,
contain or emit chemicals known to the
State of California to cause cancer and birth
defects or other reproductive harm.
Headlight
Headlight-ON
Headlight-OFF
Fast
Slow
Engine Speed Control
Choke
Battery
Oil Pressure
IMPORTANT
The engine in this machine is not equipped by the manufacturer
with a standard spark arrester.
It is a violation of California Public Resource Code Section 4442 to
use or operate this engine on or near any forest-covered, brushcovered land, or grass- covered land unless the exhaust system is
equipped with a working spark arrester meeting state laws. Other
states or federal areas may have similar laws.
This potential includes water supply, food from the soil and from
the sea, industrial development, architecture and construction,
transportation.
Thousands of people depend on KUBOTA's know-how, technology,
experience and customer service. You too can depend on
KUBOTA.
The spark ignition system of GR2020G complies with Canadian ICES-002.
FOREWORD
You are now the proud owner of a KUBOTA LAWN AND GARDEN TRACTOR. This
machine is a product of KUBOTA's quality engineering and manufacturing. It is
made of excellent materials and under a rigid quality control system. It will give you
long, satisfactory service. To obtain the best use of your machine, please read this
manual carefully. It will help you become familiar with the operation of the machine
and contains many helpful hints about machine maintenance. It is KUBOTA's policy
to utilize, as quickly as possible, every advance in our research. The immediate use
of new techniques in the manufacturing of products may cause some small parts of
this manual to become outdated. KUBOTA distributors and dealers will have the
most up-to-date information. Please do not hesitate to consult them.
3
This symbol, the industry's ''Safety Alert Symbol'', is used throughout this manual
and on labels on the machine itself to warn of the possibility of personal injury.
Read these instructions carefully. It is essential that you read the instructions and
safety regulations before you attempt to assemble or use this unit.
3
3
3
IMPORTANT :
NOTE :
DANGER :
WARNING :
CAUTION :
Indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
Indicates a potentially hazardous situation which, if not
avoided, could result in minor or moderate injury.
Indicates that equipment or property damage could result if
instructions are not followed.
Gives helpful information.
SAFETY FIRST
CONTENTS
SAFE OPERATION ............................................................................................ -1
SERVICING OF LAWN AND GARDEN TRACTOR .................................................... 1
SPECIFICATIONS....................................................................................................... 2
IMPLEMENT LIMITATIONS ........................................................................................ 4
INSTRUMENT PANEL AND CONTROLS................................................................... 6
MOWER MOUNTING .................................................................................................. 7
ATTACHING THE MOWER ..................................................................................... 7
Mounting the Mower Deck................................................................................................7
ADJUSTING THE PARALLEL LINKAGE................................................................. 9
ADJUSTING THE MOWER DECK (SIDE TO SIDE) ............................................... 9
ADJUSTING THE MOWER LIFT STOPPERS ...................................................... 10
DISMOUNTING THE MOWER DECK ................................................................... 10
OPERATING THE ENGINE....................................................................................... 11
STARTING THE ENGINE ...................................................................................... 11
Key Switch......................................................................................................................12
Throttle Lever and Choke Lever ..................................................................................... 13
Cold Weather Starting ....................................................................................................14
Block Heater (Option) ..................................................................................................... 14
STOPPING THE ENGINE...................................................................................... 14
Engine Stop (By manual)................................................................................................ 15
WARMING UP ....................................................................................................... 15
Warm-up and Transmission Oil in the Low Temperature Range....................................15
JUMP STARTING .................................................................................................. 16
HIGH ALTITUDE OPERATION.............................................................................. 16
OPERATING THE MACHINE.................................................................................... 17
OPERATING NEW MACHINE ............................................................................... 17
Changing Lubricating Oil for New Machines...................................................................17
Engine Break-in .............................................................................................................. 17
Machine Break-in............................................................................................................ 17
STARTING ............................................................................................................. 18
Operator's Seat...............................................................................................................18
Head Light Switch........................................................................................................... 18
Hydraulic Lift Lever.........................................................................................................19
Throttle Lever..................................................................................................................19
Parking Brake ................................................................................................................. 19
Speed Control Pedal.......................................................................................................20
Cruise Control Device..................................................................................................... 20
STOPPING............................................................................................................. 21
Stopping.......................................................................................................................... 21
CHECK DURING DRIVING ................................................................................... 21
Immediately Stop the Engine if:......................................................................................21
Easy Checker (TM)......................................................................................................... 21
Engine Overheating Precautions....................................................................................21
CONTENTS
Fuel Gauge.....................................................................................................................22
Hourmeter.......................................................................................................................22
PARKING ............................................................................................................... 23
Parking............................................................................................................................ 23
TRANSPORTING................................................................................................... 23
Directions for Use of Power Steering..............................................................................23
Glide Steer......................................................................................................................24
OPERATING THE MOWER ...................................................................................... 25
MAKING THE MOST OF YOUR MOWER............................................................. 25
ADJUSTING CUTTING HEIGHT ........................................................................... 25
Cutting Height Control Dial ............................................................................................. 25
OPERATING THE MOWER................................................................................... 27
KRA system Normal Operating Mode.............................................................................27
PTO Lever ......................................................................................................................28
KRA system Override Mode ...........................................................................................28
CLEANING ................................................................................................................ 30
CLEANING WITH WATER..................................................................................... 30
CLEANING THE MOWING SYSTEM .................................................................... 30
TIRE AND WHEELS.................................................................................................. 31
TIRES..................................................................................................................... 31
Inflation Pressure............................................................................................................31
WHEELS ................................................................................................................ 32
MAINTENANCE......................................................................................................... 33
SERVICE INTERVALS .......................................................................................... 33
LUBRICANTS, FUEL AND COOLANT .................................................................. 37
PERIODIC SERVICE................................................................................................. 41
HOW TO OPEN THE HOOD ................................................................................. 41
DAILY CHECK ....................................................................................................... 41
Checking Engine Oil Level..............................................................................................42
Checking Amount of Fuel and Refueling ........................................................................ 43
Checking and Cleaning Radiator and Screen to Prevent Overheating...........................44
Checking Tire Pressure ..................................................................................................45
Checking Transmission Fluid Level................................................................................46
Checking Coolant Level.................................................................................................. 46
Lubricating All Grease Fittings........................................................................................ 47
Checking Movable Parts................................................................................................. 48
EVERY 25 HOURS ................................................................................................ 48
Cleaning Precleaner and Air Cleaner Paper Element .................................................... 48
EVERY 50 HOURS ................................................................................................ 49
Checking Engine Start System.......................................................................................49
Checking OPC System ...................................................................................................50
Checking PTO Control System....................................................................................... 50
Cleaning Air Cleaner Element ........................................................................................ 51
Checking Carbon Canister Air Filter ............................................................................... 52
Checking Gear Box Oil Level.......................................................................................... 53
Greasing .........................................................................................................................53
Oiling...............................................................................................................................54
Checking Battery Condition ............................................................................................ 57
CONTENTS
EVERY 100 HOURS .............................................................................................. 58
Replacing Air Cleaner Paper Element............................................................................58
Cleaning Engine Shroud Panel.......................................................................................59
Checking Fuel Lines, Fuel Vapor Lines and Fuel Filter..................................................59
Checking Brake ..............................................................................................................61
Checking Fan Drive Belt Tension ................................................................................... 61
EVERY 150 HOURS .............................................................................................. 62
Changing Gear Box Oil................................................................................................... 62
EVERY 200 HOURS .............................................................................................. 63
Replacing Engine Oil Filter Cartridge .............................................................................63
Changing Engine Oil....................................................................................................... 64
Replacing Transmission Oil Filter Cartridge ...................................................................65
Checking Radiator Hose and Clamp ..............................................................................66
Checking Hydraulic Hose ...............................................................................................66
Adjusting Front Axle Pivot...............................................................................................68
Checking Spark Plug Condition & Gap........................................................................... 68
Cleaning Engine Shroud................................................................................................. 68
Checking Intake Air Line................................................................................................. 68
Replacing Fuel Filter....................................................................................................... 69
EVERY 400 HOURS .............................................................................................. 69
Changing Transmission Fluid ......................................................................................... 69
Cleaning Transmission Strainer......................................................................................70
Changing Front Axle Case Oil ........................................................................................ 70
Replacing Fuel Filter....................................................................................................... 71
EVERY 1500 HOURS ............................................................................................ 71
Checking Fuel Injection Nozzle (Injection Pressure) ......................................................71
EVERY 3000 HOURS ............................................................................................ 71
Checking Injection Pump................................................................................................71
EVERY 1 YEAR ..................................................................................................... 71
Replacing Air Cleaner Element.......................................................................................71
Flush Cooling System and Changing Coolant................................................................71
Anti-freeze ......................................................................................................................72
EVERY 2 YEARS................................................................................................... 73
Replacing Hydraulic Hose ..............................................................................................73
Replacing Fuel Lines and Fuel Vapor Lines...................................................................73
Replacing Engine Breather Hose ...................................................................................73
Replacing Radiator Hose................................................................................................73
Replacing Mower Gear Box Oil Seal .............................................................................. 73
Replacing Intake Air Line................................................................................................ 73
SERVICE AS REQUIRED...................................................................................... 73
Replacing Fuses.............................................................................................................73
Replacing bulbs .............................................................................................................. 74
Checking and Replacing Blade.......................................................................................74
Mower Belt Replacement................................................................................................76
Bleeding Fuel System..................................................................................................... 76
ADJUSTMENT........................................................................................................... 77
GENERAL TORQUE SPECIFICATION ................................................................. 77
TIGHTENING TORQUE CHART ........................................................................... 78
STORAGE ................................................................................................................. 79
TROUBLESHOOTING............................................................................................... 80
CONTENTS
ENGINE TROUBLESHOOTING ............................................................................ 80
BATTERY TROUBLESHOOTING ......................................................................... 80
MACHINE TROUBLESHOOTING ......................................................................... 81
MOWER TROUBLESHOOTING............................................................................ 82
INDEX........................................................................................................................ 83
-1SAFE OPERATION
SAFE OPERATION
Careful operation is your best insurance against an accident. Read and understand this section carefully before operation.
All operators, no matter how experienced they may be, should read this and other related manuals before operation of the
machine or any implement attached to it. It is the owner's obligation to instruct all operators in safe operation.
This cutting machine is capable of amputating hands and feet and throwing objects. Failure to observe the following safety
instructions could result in serious injury or death.
15.Keep your machine clean. Dirt, grease, and trash
1. BEFORE OPERATING
1. Know your equipment and its limitations. Read,
understand and follow all instructions in this manual
before attempting to start and operate the machine.
2. Know the controls and how to stop quickly.
3. Pay special attention to the safety labels on the
machine and mower.
4. The exhaust gas from the muffler is very hot. To
prevent fire, do not expose dry grass, mowed grass, oil
or any other combustible materials to exhaust gas.
Use a spark arrester where required. Also keep the
engine and muffler clean all the time.
5. Never wear loose, torn, or bulky clothing. It may catch
on moving parts or controls, leading to the risk of
accident. Safety boots or shoes, eye and hearing
protection, gloves, etc. are recommended.
6. Do not operate machine or any implement attached to
it while under the influence of alcohol, drugs, or other
substances or while fatigued.
7. Check brakes, and other mechanical parts for faulty
adjustment and wear. Replace worn or damaged parts
promptly. Check the tightness of all nuts and bolts
regularly. (For further details, see "MAINTENANCE"
section.)
8. Keep the machine and attachments in good operating
condition and keep safety devices in place and in
proper working condition.
9. This machine is equipped with many safety devices.
Do not attempt to remove or alter them.
10.Keep all shields and guards in place. Replace all
missing or damaged items for your safety.
11.Never allow any bystanders around or near machine
during operation.
Be sure the area is clear of other people before
mowing.
Stop machine if anyone enters the area.
12.Before allowing other people to use your machine,
explain proper operation to them and have them read
this manual before operation.
13.Never allow passengers or non-qualified operators on
the machine at any time. You must operate the
machine from the seat only.
14.Carefully check the area to be mowed and clear any
objects such as rocks, bottles, cans, toys, etc., that
may damage the mower, the grass catcher or cause
personal injury.
accumulations contribute to fires or lead to personal
injury.
16.Keep all nuts, bolts, and screws tight to be sure the
equipment is in safe working condition.
Check the mower blade mounting bolts for proper
tightness at frequent intervals.
17.Use only attachments recommended by KUBOTA.
Use proper ballast to front or rear of machine to reduce
the risk of upsets. Follow the "Safe Operation"
procedures, specified in the Equipment's Manual.
18.Follow the maintenance recommendations. See
"MAINTENANCE" section.
19.It is recommended that your machine be thoroughly
inspected at least once a year by an authorized
KUBOTA Dealer.
2. OPERATING
C Starting
1. Never start engine or operate levers from anywhere
other than the seat.
2. Before starting the engine, make sure that all levers
(including auxiliary control levers) are in their neutral
positions, that the parking brake is engaged, and that
both the mower clutch and the Power Take-Off (PTO)
are disengaged.
3. Do not start engine by shorting across starter
terminals or by by-passing the safety start switch. The
machine may start and move if normal starting circuitry
is bypassed.
4. Do not operate or idle engine in a poorly ventilated
area. Exhaust contains poisonous carbon monoxide, a
colorless and odorless gas.
C Working
1. Watch where you are going at all times. Watch for and
avoid obstacles. Be alert near trees and other
obstructions.
2. When working in groups, always let others know what
you are doing ahead of time.
3. Never try to get on or off a moving machine.
4. When using any attachments, never direct discharge
material toward bystanders. Do not allow anyone near
the attachments while in operation.
Do not mow when bystanders are present in the
mowing area.
SAFE OPERATION-2
5. To reduce fire hazards, keep the engine exhaust area
free of grass or leaves.
6. Slow down before turning.
7. Turn off blades when not mowing.
8. Mow only in daylight.
9. Be sure rotating blades and engine are stopped and
the key is removed before placing hands or feet near
blades.
10.Shut the engine off and wait for all movement to stop
before unclogging chute.
11.Know what is behind you and disengage power to
mower before backing up. Do not mow while in reverse
unless absolutely necessary and only after
observation of the entire area behind the mower.
12.Know what is behind you before overriding the KRA
system. Do not override the KRA system unless
absolutely necessary and safe to do so.
KUBOTA strongly recommends against overriding the
KRA system.
13.When mowing for the first time, cut the grass higher
than desired.
This will uncover any unseen object that may damage
the mower or grass catcher.
14.Always inspect the mower and grass catcher after
striking any foreign object. This will insure that all
mower and grass catcher parts are safe and secure
and not damaged.
Repair or replace any damaged parts before restarting.
15.Use only attachment recommended in this manual.
Use proper ballast to front or rear of machine to reduce
the risk of upsets. Follow the "SAFE OPERATION"
procedures specified in the manuals included with the
equipment.
16.Do not operate the mower without either the grass
container or the guard in place.
Be aware of the mower discharge direction and do not
point it at anyone.
17.Watch for traffic when operating near or crossing
roadways.
18.Never leave a running machine unattended.
Always turn off blades, set parking brake, stop engine,
and remove the key before dismounting.
19.Be extremely alert for all other traffic when operating
the mower and grass catcher near public roads or
highways.
20.Do not operate where machine could tip or slip.
Do not operate near ditches, holes, embankments, or
other terrain which may collapse under the machine's
weight. The risk of machine tip-over is increased when
the ground is loose or wet.
C Pulling loads
Use extra care when pulling loads to reduce the risk of
serious personal injury or death due to a machine tip-over.
a) Pull only from the hitch. Never attach loads to the axle
housing or any other point above hitch.
b) Limit loads to those you can safely control.
c) Do not turn sharply.
d) Use care when backing.
e) Use front ballast or wheel weights when suggested in
this Operator's Manual.
C Operation on slopes
Slopes are a major factor related to loss-of-control and tipover accidents, which can result in severe injury or death.
All slopes require extra caution. If you cannot back up the
slope or if you feel uneasy on it, do not mow it.
A Do not lift the grass container on a slope.
DO
1. Slowly mow up and down slopes, not across, to avoid
machine tip-over. Stay off hills and slopes too steep for
safe operation. Do not make sudden changes in speed
or direction.
2. Avoid starting or stopping on a slope. If tires lose
traction, disengage the blades and proceed slowly
straight down the slope.
3. If the machine stops going uphill, disengage PTO and
back slowly down.
4. Reduce speed and exercise extreme caution on
slopes and in sharp turns to prevent tip-over or loss of
control.
5. Use special caution when changing direction on
slopes.
6. Remove obstacles such as rocks, tree limbs, etc.
7. Stay alert for holes in the terrain and other hidden
hazards. Keep away from drop-offs. Uneven terrain
could overturn the machine. Tall grass can hide
obstacles.
8. Follow KUBOTA's recommendations for wheel
weights or counterweights to improve stability.
9. The weight of grass in the grass container may
increase the possibility of tip over.
DO NOT 3. USING THE PTO
-3SAFE OPERATION
1. Do not turn on slopes unless necessary and then turn
slowly and gradually downhill, if possible.
2. Do not use the machine on steep inclines.
3. Do not mow near drop-offs, ditches, or embankments.
The machine could suddenly turn over if a wheel falls
over the edge of a cliff or ditch, or if an edge caves in.
4. Do not mow on wet grass. Reduced traction could
cause sliding.
5. Do not try to stabilize the machine by putting your foot
on the ground.
6. Do not stop or start suddenly when going uphill or
downhill.
7. Never "freewheel". Do not let the machine travel
downhill with HST pedal at neutral position.
8. Do not modify or alter the machine and protective
guards.
C Children
Tragic accidents can occur if the operator is not alert to
the presence of children. Children are attracted to the
machine and the mowing activity. Never assume that
children will remain where you last saw them.
1. Keep children out of the mowing area and under the
watchful care of another responsible adult.
2. Be alert and turn the machine off if children enter the
area.
3. Before and when backing, look behind and down for
small children.
4. Never carry children. They may fall off and be
seriously injured or interfere with safe machine
operation.
5. Never allow children to operate the machine, even
under adult supervision.
6. Use extra care when approaching blind corners,
shrubs, trees, or other obstructions that might hide
children from sight.
C Operators, age 60 years and above
Data indicates that operators, age 60 years and above,
are involved in a large percentage of machine-related
injuries. These operators should evaluate their ability to
operate the machine safely enough to protect themselves
and others from serious injury.
C Stopping
1. Make sure that the machine has come to a complete
stop before dismounting.
2. Before dismounting, disengage the PTO, lower all
implements, place all control levers in their neutral
positions, apply parking brake, turn off the engine and
remove the key.
3. Do not park the machine on a steep incline. Park on a
flat level surface.
1. Before installing or using PTO-driven equipment, read
the manufacturer's manual and review the safety
labels attached to the equipment.
2. Wait until all moving components have completely
stopped before connecting, disconnecting, adjusting,
cleaning, or servicing any PTO-driven equipment.
3. Use the PTO with KUBOTA approved attachments.
4. USING THE LIFT LINK
1. Use lift link only with KUBOTA authorized attachments
designed for lift link usage.
5. TRANSPORTING
1. Disengage power to attachment(s) when transporting
or not in use.
2. Do not tow this machine. Use a suitable truck or trailer
when transporting on public roads.
3. It is recommended that this machine not be used on
public roads.
4. Use extra care when loading or unloading the machine
into a trailer or truck.
6. SERVICING
1. Before servicing the machine, park the machine on a
firm, level surface, set the parking brake, stop the
engine and remove the key.
2. Securely support machine or any machine elements
with stands or suitable blocking before working
underneath. For your safety do not rely on
hydraulically supported devices, they may leak down,
suddenly drop or be accidently lowered.
3. To avoid injury, do not adjust, unclog or service the
mower or grass catcher with the engine running. Make
sure rotating blades are stopped before dismounting
the machine.
4. Disengage power to attachment(s), stop the engine
and remove the key before making any repairs or
adjustments.
5. Allow the machine to cool off before servicing the
engine, muffler, etc.
6. Keep machine free of grass, leaves, or other debris
build-up.
7. Use extra care in handling gasoline and diesel fuels.
They are flammable and vapor is explosive.
(1) Use only an approved container.
(2) Do not remove fuel cap or refuel with the engine
running. Allow engine to cool before refueling. Do
not smoke while refueling or when standing near
fuel.
SAFE OPERATION-4
(3) Do not refuel the machine indoors and always
clean up spilled fuel or oil.
(4) Do not store the machine or fuel container inside
where there is an open flame, such as in a water
heater.
8. Do not change the engine governor setting or
overspeed the engine.
9. Never run a machine inside a closed area.
10.Mower blades are sharp and can cut your hands. Wrap
the blade(s) or wear gloves, and use extra caution
when servicing them.
11.Keep nuts and bolts, especially blade attachment
bolts, tight and keep equipment in good condition.
12.Do not smoke when working around the battery.
Keep all sparks and flames away from battery. The
battery presents an explosion hazard because it gives
off hydrogen and oxygen...especially when
recharging.
13.Before "JUMP STARTING" a dead battery, read and
follow all of the instructions to help protect the
alternator from damage due to extreme load changes.
(See "JUMP STARTING" in "OPERATING THE
ENGINE" section.)
Batteries contain sulfuric acid and produce explosive
gases. Follow the instructions below to prevent
personal injury.
A Wear eye and skin protection.
A Keep sparks and flame away.
A Always have adequate ventilation while charging
or using the battery.
14.Keep first aid kit and fire extinguisher available at all
times.
15.Disconnect the battery's negative (-) cable before
working on or near electric components.
16.Do not use or charge the refillable type battery if the
fluid level is below the LOWER (lower limit level) mark.
Otherwise, the battery component parts may
prematurely deteriorate, which may shorten the
battery's service life or cause an explosion. Check the
fluid level regularly and add distilled water as required
so that the fluid level is between the UPPER and
LOWER levels.
17.To avoid sparks from an accidental short circuit,
always disconnect the battery's negative (-) cable first
and connect it last.
(1) Battery
(2) Positive cable (+)
(3) Negative cable (-)
18.Make sure cir-clips, nuts and spring lock washers are
properly secured on the front and rear wheels,
respectively.
19.Never tamper with safety devices.
Check their proper operation regularly.
20.Check brake operation frequently. Adjust and service
as required.
21.Properly dispose of used lubricants, filters, batteries,
and other such components.
22.Do not attempt to mount a tire on a rim. This should be
done by a qualified person with the proper equipment.
23.Always maintain the correct tire inflation pressure. Do
not inflate tires above the recommended pressure
shown in the Operator's Manual.
24.Securely support the machine when changing wheels.
25.Make sure that wheel bolts have been tightened to the
specified torque.
26.Escaping hydraulic fluid under pressure has sufficient
force to penetrate the skin causing serious personal
injury. Before disconnecting lines, be sure to relieve all
pressure. Before applying pressure to the system,
make sure all connections are tight and that lines,
pipes, and hoses are not damaged.
27.Fluid escaping from pinholes may be invisible. Use a
piece of cardboard or wood to search for suspected
leaks: do not use hands. Use safety goggles or other
eye protection.
If injured by escaping fluid, see a medical doctor at
once. Serious infection or reaction will result if proper
medical treatment is not administered immediately.
This fluid can produce gangrene or severe allergic
reaction.
-5SAFE OPERATION
7. STORAGE
1. Keep the machine and supply of fuel in locked storage
and remove the key to prevent children or others from
playing or tampering with them.
2. When machine is to be stored for a long time,
disconnect battery cables or remove the battery.
Always remove the negative (-) cable first and reinstall
the negative (-) cable last.
3. Do not store the machine with fuel in the tank inside a
building where fumes may ignite. Allow the engine to
cool before storing.
4. To avoid the danger of exhaust fume poisoning, do not
operate the engine in a closed building without
adequate ventilation.
5. To reduce fire hazards, clean the machine thoroughly
before storage. Dry grass and leaves around the
engine and mufflers may ignite.
6. Moisture content in most grasses can damage the
mower and grass catcher if these components are not
properly cleaned after use. Also, dry grass and leaves
left in the container can be a fire hazard. Always make
sure the container and the duct are clean and
completely empty before storage.
(1) Cardboard
(2) Hydraulic line
(3) Magnifying glass
28.Waste products such as used oil, fuel, hydraulic fluid,
and batteries, can harm the environment, people, pets
and wildlife. Please dispose properly.
29.Do not use beverage containers for waste fluids or
other products. Someone, particularly children, may
drink them by mistake.
30.See your local Recycling Center or KUBOTA Dealer to
learn how to recycle or get rid of waste products.
A A Material Safety Data Sheet (MSDS) provides
specific details on chemical products; physical and
health hazards, safety procedures, and emergency
response techniques. The seller of the chemical
products used with your machine is responsible for
providing the MSDS for that product upon request.
SAFE OPERATION-6
8. DANGER, WARNING AND CAUTION LABELS
-7SAFE OPERATION
SAFE OPERATION-8
-9SAFE OPERATION
SAFE OPERATION-10
9. CARE OF DANGER, WARNING AND CAUTION LABELS
1. Keep danger, warning and caution labels clean and free from obstructing material.
2. Clean danger, warning and caution labels with soap and water, dry with soft cloth.
3. Replace damaged or missing danger, warning and caution labels with new labels from your local KUBOTA Dealer.
4. If a component with danger, warning and caution label(s) affixed is replaced with new parts, make sure new label(s) is
(are) attached in the same location(s) as the replaced component.
5. Mount new danger, warning and caution labels by applying on a clean dry surface and pressing any bubbles to outside
edge.
1SERVICING OF LAWN AND GARDEN TRACTOR
SERVICING OF LAWN AND GARDEN TRACTOR
After reading this manual thoroughly, you will find that you
can do some of the regular maintenance yourself. Your
dealer is interested in helping you get the best
performance from your new machine and wants to help
you get the most value from it. When in need of parts or
major service, be sure to see your KUBOTA Dealer. When
in need of parts, be prepared to give your dealer the
machine, engine and mower serial numbers.
Locate the serial numbers now and record them in the
space provided.
Type Serial No.
Machine
Engine
Mower
Date of Purchase
Name of Dealer
(To be filled in by purchaser)
C Warranty
This machine is warranted under the Kubota Limited
Express warranty a copy of which may be obtained from
your selling dealer. No warranty shall, however, apply if
the machine has not been handled according to the
instruction given in the Operator's Manual even it is within
the warranty period.
C Scrapping the machine and its procedure
To put the machine out of service, correctly follow the
local rules and regulations of the country or territory where
you scrap it. If you have questions, consult your local
KUBOTA Dealer.
(1) Engine serial No.
(1) Machine serial No.
(2) Mower serial No.
(1) Engine serial No.
2 SPECIFICATIONS
SPECIFICATIONS
Model GR2020G GR2120 GR2120AU
Model GH630 D782
Type Air-cooled Gasoline Liquid-cooled Diesel
Total displacement cm (cu. in.) 624 (38.1) 778 (47.5)
Gross power kW (HP) 15.3 (20.5)*1 15.6 (21)*1
Rated revolution rpm --- 3000
Low idling revolution rpm --- 1200 to 1350
Engine
Capacity
Machine
No. of cylinders 2 3
Starter Electric starter with battery
Battery 10U1L (12V, 300CCA) 51R (12V, 475CCA)
Fuel
Preheating system --- Super glow
Engine stop Key stop
Fuel tank L (U.S.gals.) 16 (4.2) 18 (4.8)
Engine oil L (U.S.qts.) 1.9 (2.0) 2.8 (3.0)
Radiator coolant L (U.S.qts.) --- 2.1 (2.2)
Hydrostatic transmission oil L (U.S.qts.) 3.3 (3.5)
PTO Shaft drive
PTO clutch Hydraulic Wet Multi Discs
PTO brake Wet Multi Discs
Front
Tires
Rear
Steering type Full hydraulic power steering (Glide steer)
Brake Internal expanding brake
Travel speed control Foot pedal
Transmission Hydrostatic
Traveling
speeds
Forward km/h (mph) 0 to 10 (0 to 6.2)
Reverse km/h (mph) 0 to 5 (0 to 3.1)
Size 16 x 7.50 - 8
Type Turf, Bar Turf, Bar Turf
Size 23 x 10.50 - 12
Type Turf, Bar Turf, Bar Turf
Automobile unleaded
or regular gasoline
Gasohol*2
MTBE*2
Diesel fuel No.1 (below -10 )
Diesel fuel No.2 (above -10 )
Model GR2020G GR2120 GR2120AU
Overall length mm (in.) 1990 (78.3)
Overall width with mower deck mm (in.) 1550 (61.0) 1550 (61.0) 1700 (66.9) 1550 (61.0)
Overall height mm (in.) 1290 (50.8)
Dimensions
Mower deck Model RCK48GR RCK48GR RCK54GR RCK48GR
Grass catcher Opt. Opt. ---
Wheel base mm (in.) 1280 (50.4)
Front mm (in.) 825 (32.5)
Tread
Rear mm (in.) 820 (32.3)
Weight with mower deck kg (lbs) 400 (882) 435 (959) 440 (970) 435 (959)
Model RCK48GR RCK54GR
Cutting width mm (in.) 1219 (48.0) 1372 (54.0)
Cutting height mm (in.) 25 to 102 (1.0 to 4.0)
3SPECIFICATIONS
Adjustment of cutting height Dial gauge
Mounting method Quick joint, Parallel linkage
Weight (Approx.) kg (lbs) 75 (165.3) 80 (176.4)
Mower
Total length mm (in.) 900 (35.4) 905 (35.6)
Dimensions
Total width mm (in.) 1550 (61.0) 1700 (66.9)
Total height mm (in.) 290 (11.4)
Discharge direction RIGHT
Gear box oil L (U.S.qts.) 0.15 (0.16)
NOTE: *1 Manufacturer's estimate The company reserves the right to change the specifications without notice.
*2 Gasohol (up to 10% ethyl alcohol, 90% unleaded gasoline by volume) or Methyl Tertiary Butyl Ether (MTBE) and
unleaded gasoline blends (up to a maximum of 15% MTBE by volume) are approved for the engine. Other
gasoline/alcohol blends are not approved.
4 IMPLEMENT LIMITATIONS
IMPLEMENT LIMITATIONS
The KUBOTA Machine has been thoroughly tested for proper performance with implements sold or approved by KUBOTA.
Use of implements which exceed the maximum loading weight listed below, or which are not recommended for use with
the KUBOTA Machine may result in malfunctions or failures of the machine, damage to other property and injury to the
operator or others. (Any malfunctions or failures of the machine resulting from use with improper implements are not
covered by the warranty.)
Maximum axle loading weight
MODEL Front axle Wf Rear axle Wr Total gross vehicle weight
GR2020G
GR2120
GR2120AU
300 kg (661 lbs) 500 kg (1102 lbs) 700 kg (1543 lbs)
B Ballast
To avoid serious injury:
A Additional ballast will be needed for operating
specific attachments. When the attachment is
raised, drive slowly over rough ground,
regardless of how much ballast is used.
A Add front ballast to increase front end stability
and help prevent possible front end tip up.
A Always back up when going up a slope. Driving
forward could cause the machine to tip over
backward. Stay off hills and slopes too steep
for safe operation.
Front ballast is added for stability and steering control
when heavy rear mounted equipment is installed.
Front ballast also compensates for weight transferred to
the rear wheels by the draft of towed implements through
the hitch.
Add additional front ballast, if necessary, for stability and
safety during transport of heavy rear mounted equipment.
Front end ballast may not always maintain the required
stability if the machine is driven too fast over rough ground
with heavy rear mounted equipment in the raised position.
Use care and drive slowly under these conditions.
Limit ballast to machine operating capacity. Be sure to
remove ballast when it is not needed.
Add ballast to rear end if needed for stability. Heavy front
mounted attachments tend to lift rear wheels. Add enough
ballast to maintain steering control and prevent tipover.
The Attachment's Manual shows how much rear ballast is
required for your application. Rear ballast are available
from your KUBOTA Dealer.
5IMPLEMENT LIMITATIONS
6 INSTRUMENT PANEL AND CONTROLS
INSTRUMENT PANEL AND CONTROLS
(1) Easy checker(TM)....................................... 21
(2) Choke lever (GR2020G)............................. 13
(3) Throttle lever............................................... 19
(4) Head light switch......................................... 18
(5) Parking brake pedal.................................... 19
(6) PTO lever.................................................... 28
(7) Hydraulic lift lever........................................ 19
(8) Hour meter.................................................. 22
(9) Cruise control knob..................................... 20
(10) KRA system override switch..................... 28
(11) Key switch................................................. 12
(12) Brake pedal............................................... 11
(13) Speed control pedal.................................. 20
MOWER MOUNTING
ATTACHING THE MOWER
To avoid serious injury:
A Shut off the engine and remove the key before
attaching the mower.
BMounting the Mower Deck
1. Park the machine on level ground and place the
mower deck at the left side of the machine.
2. Set the front anti-scalp rollers at the topmost position.
Turn the front wheel to the right.
3. Pull the hydraulic lift lever to raise rear links.
4. Adjust the height control dial to "1". Slide the mower
deck under the machine, and then return wheels to
straight ahead position.
(1) Hydraulic lift lever
(2) Mower's rear link
6. Release the L pins lock to attach the rear links to the
mower deck.
7MOWER MOUNTING
(A) "RIGHT"
5. Place the hydraulic lift lever in the "DOWN" position.
Push down the rear links to align with the mower
bracket.
(1) Mower's rear link
(2) L pin
7. Attach the front links to the front roller brackets.
MOWER MOUNTING8
(1) Front link
(2) Front roller bracket
A Adjust the length (L) of the front link.
(See "ADJUSTING THE PARALLEL LINKAGE" in
"MOWER MOUNTING" section.)
8. Pull the lever fulcrum fixing pin and turn it counter
clockwise to lock.
9. Hook and raise the front link with the link fixing lever,
and then lay the link fixing lever onto the front bracket
of the machine.
10.Turn the lever fulcrum fixing pin clockwise and push it
into position to fix the link fixing lever.
(1) Link fixing lever
(2) Lever fulcrum fixing pin
(3) Front link
(4) Front bracket
(1) Universal joint
(2) Coupler
(A) "TUG"
A For dismounting the mower deck, reverse the above
procedures.
11.Pull back the coupler of the universal joint.
Push the universal joint into the PTO shaft until the
coupler locks.
Tug the universal joint backward and forward to make
sure it is locked securely.
9MOWER MOUNTING
ADJUSTING THE PARALLEL LINKAGE
ADJUSTING THE MOWER DECK (SIDE TO
SIDE)
To avoid serious injury:
A Shut off the engine and remove the key.
A Set parking brake.
A Allow the blades to stop before making
adjustments.
A Blades may be sharp, when you handle blades,
wear heavy gloves or wrap end of blade with a
rag.
1. Park the machine on a level surface.
2. Make sure the mower blades are level. Then tighten
the lock nuts securely.
Adjust (L) of front links with lock nut so that A is 0 to 5
mm (0 to 0.2 in.).
A = (Y) - (X)
To avoid serious injury:
A Shut off the engine and remove the key.
A Set parking brake.
A Allow the blades to stop before making
adjustments.
A Blades may be sharp. When you handle blades,
wear heavy gloves or wrap end of blade with a
rag.
1. Park the machine on a level surface.
2. Tire inflation pressure must be correct.
(See "TIRE AND WHEELS" section.)
3. Raise the hydraulic lift lever to the top position.
4. Turn the cutting height control dial to adjust height to
the desired height.
5. Lower the mower deck by pushing the hydraulic lift
lever forward.
6. Turn the left blade so that it is parallel to rear axle. Hold
drive belt and the turn right blade so that it is parallel
to axle.
7. Measure from each outside blade tip (L) and (R) to the
level surface. The difference between measurements
should be less than 3 mm (0.1 in.).
(1) Lock nut
(H) Blade tip height
MOWER MOUNTING10
8. Loosen the locknut at both sides of the machine.
Adjust the cutting height fine tuning bolts so that the
difference between measurements (L) and (R) is less
than 3 mm (0.1 in.).
9. Lock the nuts.
(1) Lift link
(2) Cutting height fine tuning bolt
(3) Lock nut
ADJUSTING THE MOWER LIFT STOPPERS
The mower lift stoppers are designed for maintaining the
balance of the mower deck, when lifting the mower to the
highest position. Make sure that the stoppers are in
contact with the underside of the frame.
To adjust:
1. Lift the mower to the highest position.
2. Loosen the lock nuts and adjust the stoppers on both
sides so that the bolt heads are in contact with the
underside of the frame.
3. Lower the mower deck.
4. Turn the stoppers counterclockwise a half turn, and
then secure the lock nuts.
(1) Mower lift stopper
(2) Lock nut
DISMOUNTING THE MOWER DECK
For dismounting the mower deck, reverse the above
procedures.
OPERATING THE ENGINE
To avoid serious injury:
A Read "SAFE OPERATION" in the front of this
manual.
A Read the danger, warning and caution labels
located on the machine.
A To avoid danger of exhaust fume poisoning, do
not operate the engine in a closed building
without proper ventilation.
A Never start the engine while standing on the
ground. Start the engine only from the
operator's seat.
STARTING THE ENGINE
1. Sit on the operator's seat.
11OPERATING THE ENGINE
2. Apply the parking brake.
To apply the parking brake:
Depress the brake pedal firmly with your right foot and the
parking brake pedal simultaneously with your left foot.
Then release the brake pedal while holding the parking
brake pedal down.
To release the parking brake:
Depress the brake pedal and release slowly.
(1) Brake
(2) Parking brake
3. Make sure that the PTO lever is in the
"DISENGAGED" position.
(1) Brake pedal
(2) Parking brake pedal
(A) "DEPRESS"
(1) PTO lever : "ENGAGED"
: "DISENGAGED"
OPERATING THE ENGINE12
4. Set the throttle lever 1/2 way forward.
(1) Throttle lever : "FAST"
: "SLOW"
5. Insert the key into the key switch and
turn clockwise 1 notch.
Make sure the easy checker lights are
ON.
BKey Switch
[GR2020G]
OFF............ The position where the key can be
inserted into or removed from the
key switch. [When the key is turned
to this position, the engine shuts off.]
ON..............
START........ Apply the parking brake and turn the
The engine keeps running.
key switch to this position to start the
engine.
: "OFF"
: "ON"
A Do not use starting fluid or ether.
A To protect the battery and the starter, make sure that
the starter is not continuously turned for more than 10
seconds at a time.
If the engine does not start, allow 60-second cool
down period between starting attempts.
A If the starter does not turn the engine over, shut off the
starter immediately. Do not make further attempts to
start the engine until the condition is corrected. Do not
jump start using another battery.
Consult your local KUBOTA dealer.
A Do not turn the key switch to the "START" position
while the engine is running.
A When the temperature is below 0 (32 ), run the
engine at medium speed to warm up the lubricant of
the engine and the transmission for at least 10
minutes. If the machine is operated before the
lubricant is warm enough, the machine life will be
shortened.
A Do not operate the machine under full load until it is
sufficiently warmed up 2 or 3 minutes for temperature
above 0 (32 ).
A When the ambient temperature is less than -15
(5 ), remove the battery from the machine and store
it somewhere warm until the next operation.
: "START"
13OPERATING THE ENGINE
[GR2120, GR2120AU]
OFF............ The position where the key can be
inserted into or removed from the
key switch. [When the key is turned
to this position, the engine shuts off.]
ON..............
PREHEAT...
START........ Apply the parking brake and turn the
The engine keeps running.
The super glow plug is heated.
key switch to this position to start the
engine.
6. [GR2120, GR2120AU]
Turn the key switch to the "PREHEAT"
position clockwise, and hold it for about
5 seconds.
For the appropriate preheating time,
refer to the table below:
Temperature Preheating Time
Over 0 (32 ) 5 sec.
Below 0 (32 ) 10 sec.
BThrottle Lever and Choke Lever
Pulling the throttle lever downward decreases the engine
speed and pushing it upward increases the engine speed.
: "OFF"
: "ON"
A Do not turn the key switch to the "START" position
while the engine is running.
A When the temperature is below 0 (32 ), run the
engine at medium speed to warm up the lubricant of
the engine and the transmission for at least 10
minutes. If the machine is operated before the
lubricant is warm enough, the machine life will be
shortened.
A Do not operate the machine under full load until it is
sufficiently warmed.
A Do not use starting fluid or ether.
A When the ambient temperature is less than -15
(5 ), remove the battery from the machine and store
it somewhere warm until the next operation.
: "PREHEAT"
: "START"
(1) Throttle lever : "FAST"
: "SLOW"
[GR2020G]
C Choke lever
[For a Cold Engine]
Always pull the choke knob out to the "ON" position to
start the engine in cold conditions.
Gradually return the choke control to the "OFF" position
after the engine starts and warms up.
The engine/equipment may be operated during the warmup period, but it may be necessary to leave the choke
partially on until the engine warms up.
[For a Warm Engine]
Always push the choke knob in to the "OFF" position after
the engine starts.
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