Kubota Z411, Z421, Z421T Operator's Manual
OPERATOR'S MANUAL
MANUAL DEL OPERADOR
AX . C . 5 - 5 . - . AK
English, Spanish (U.S.A.)
Code No.
Código n°
K3071-7121-4
MODELS
MODELOS
Z411
Z421
Z421T
Z411·Z421·Z421T
1SFRT00108A01
PRINTED IN U.S.A.
IMPRESO EN E.E.U.U.
KUBOTA Corporation 2016
©
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LEA Y CONSERVE ESTE MANUAL
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, until today, 30 plants and 35,000 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 intended to help
individuals and nations fulfill the potential inherent in their
environment. For KUBOTA is the Basic Necessities Giant.
This potential includes water supply, food from the soil and from
the sea, industrial development, architecture, construction and
transportation.
Thousands of people depend on KUBOTA's know-how, technology,
experience and customer service. You too can depend on
KUBOTA.
KUBOTA Corporation es ···
Desde su creación en 1890, KUBOTA Corporation ha crecido
hasta convertirse en una de las empresas más importantes de
Japón.
Para conseguir esta posición, la empresa a lo largo de los años,
ha diversificado la gama de sus productos y servicios de forma
notable, hasta llegar hoy en día, con 30 fábricas y 35.000
empleados a fabricar por encima de 1.000 elementos distintos
grandes y pequeños.
Todos estos productos y todos los servicios que los acompañan,
sin embargo están unificados por un compromiso central. KUBOTA
fabrica productos que, tomados a escala nacional, cubren
necesidades básicas. Productos que son indispensables,
productos destinados a ayudar a las personas y a las naciones y a
desarrollar el potencial inherente de su entorno. Por eso KUBOTA
es el gigante de las necesidades básicas.
Estas aptitudes potenciales incluyen el abastecimiento de aguas,
la producción de alimentos en la tierra y en el mar, el desarrollo
industrial, la arquitectura, la construcción y el transporte.
Miles de personas confían en el saber hacer de KUBOTA y su
tecnología, experiencia y servicio al cliente. Usted también puede
confiar en KUBOTA.
OPERATOR'S MANUAL
MODELS
Z411
Z421
Z421T
1SFRT00108A01
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ABBREVIATION LIST
Abbreviations Definitions
API
fpm
HST
m/s
PTO
RH/LH
ROPS
rpm
r/s
SAE
American Petroleum Institute
Feet Per Minute
Hydrostatic Transmission
Meters Per Second
Power Take Off
Right-hand and left-hand sides are determined by facing in the direction of forward travel
Roll-Over Protective Structures
Revolutions Per Minute
Revolutions Per Second
Society of Automotive Engineers
UNIVERSAL SYMBOLS
As a guide to the operation of your machine, 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
Read Operator's Manual
Gasoline Fuel
Fuel-Level
Parking Brake-Engaged position
Parking Brake-Disengaged position
Engine-Stop
Engine-Run
Starter Control
Power Take-Off Switch Control-Off Position
(Disengaged)
Power Take-Off Switch Control-On Position
(Engaged)
Hours
Cutting Height
Fast
Slow
Engine Speed Control
Choke
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.
Canadian Electromagnetic Compatibility (EMC):
This machine complies with Industry Canada ICES-002.
FOREWORD
You are now the proud owner of a KUBOTA ZERO TURN MOWER. 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.
SAFETY FIRST
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.
DANGER :
WARNING :
CAUTION :
IMPORTANT :
NOTE :
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.
CONTENTS
Z400
1
SAFE OPERATION......................................................................................................................5
SERVICING OF MACHINE........................................................................................................17
WARRANTY........................................................................................................................................................ 18
SCRAPPING THE MACHINE AND ITS PROCEDURE...................................................................................... 18
SPECIFICATIONS......................................................................................................................19
SPECIFICATION TABLE..................................................................................................................................... 19
IMPLEMENT LIMITATIONS.......................................................................................................21
INSTRUMENT PANEL AND CONTROLS .................................................................................22
INSTRUMENT PANEL, SWITCHES AND HAND CONTROLS ..........................................................................22
MOWER.............................................................................................................................................................. 23
MOWER MOUNTING.................................................................................................................24
MOUNTING THE MOWER DECK ...................................................................................................................... 24
ADJUSTING THE MOWER ................................................................................................................................25
DISMOUNTING THE MOWER DECK ................................................................................................................ 25
OPERATING THE ENGINE .......................................................................................................27
GETTING ON AND OFF THE MACHINE SAFELY............................................................................................. 27
STARTING THE ENGINE ...................................................................................................................................27
1. Choke knob ............................................................................................................................................... 28
2. Throttle lever.............................................................................................................................................. 29
3. Key switch ................................................................................................................................................. 29
CHECK DURING OPERATING .......................................................................................................................... 29
1. Fuel gauge................................................................................................................................................. 29
2. Hour meter................................................................................................................................................. 29
COLD WEATHER STARTING.............................................................................................................................30
WARMING UP THE ENGINE .............................................................................................................................30
1. Warm-up and transmission oil in the low temperature range ....................................................................30
JUMP STARTING ............................................................................................................................................... 30
STOPPING THE ENGINE................................................................................................................................... 31
OPERATING THE MACHINE ....................................................................................................32
OPERATING A NEW MACHINE......................................................................................................................... 32
1. Changing lubricating oil for new machine.................................................................................................. 32
2. Engine break-in ......................................................................................................................................... 32
3. Machine break-in ....................................................................................................................................... 32
OPERATING THE FOLDABLE ROPS ................................................................................................................ 33
1. Folding the ROPS...................................................................................................................................... 33
2. Raising the ROPS to the upright position .................................................................................................. 34
3. Adjusting the foldable ROPS ..................................................................................................................... 34
STARTING THE MACHINE ................................................................................................................................ 34
1. Operator's seat .......................................................................................................................................... 35
2. Seat belt .................................................................................................................................................... 35
3. Mower lift pedal ......................................................................................................................................... 35
4. Throttle lever.............................................................................................................................................. 35
5. Parking brake pedal................................................................................................................................... 36
6. Motion control lever ...................................................................................................................................36
6.1 Stop position of the motion control lever ............................................................................................ 36
6.2 Operating position of the motion control lever.................................................................................... 37
STOPPING THE MACHINE................................................................................................................................ 38
PARKING THE MACHINE .................................................................................................................................. 38
ACCESSORIES .................................................................................................................................................. 39
1. Electric outlet (12 volt), plug, smartphone holder, cup holder and utility box............................................. 39
2
Z400
TRANSPORTING THE MACHINE...................................................................................................................... 39
1. Hydrostatic transaxle bypass rods............................................................................................................. 39
OPERATING THE MOWER .......................................................................................................41
MOWING TIPS.................................................................................................................................................... 41
ADJUSTING THE CUTTING HEIGHT................................................................................................................ 41
OPERATING THE MOWER................................................................................................................................ 43
1. PTO switch ................................................................................................................................................43
2. Starting the machine.................................................................................................................................. 43
TIRES AND WHEELS................................................................................................................44
TIRES.................................................................................................................................................................. 44
1. Inflation pressure ....................................................................................................................................... 44
WHEELS............................................................................................................................................................. 44
1. Removing the front caster wheels .............................................................................................................44
2. Installing the front caster wheels ...............................................................................................................45
MAINTENANCE.........................................................................................................................46
SERVICE INTERVALS........................................................................................................................................ 46
PERIODIC SERVICE CHART LABEL ................................................................................................................48
LUBRICANTS AND FUEL................................................................................................................................... 49
PERIODIC SERVICE .................................................................................................................50
OPENING THE STEP......................................................................................................................................... 50
1. Step ...........................................................................................................................................................50
RAISING AND LOWERING THE OPERATOR'S SEAT...................................................................................... 50
DAILY CHECK .................................................................................................................................................... 50
1. Checking the engine oil level..................................................................................................................... 51
2. Checking the amount of fuel and refueling ................................................................................................ 51
3. Checking and cleaning the air intake screen............................................................................................. 52
4. Checking the transaxle fluid level .............................................................................................................. 53
5. Checking the tire pressure......................................................................................................................... 53
5.1 Inflation pressure................................................................................................................................ 53
6. Checking the dial cam rotation strength ....................................................................................................54
7. Checking movable parts ............................................................................................................................ 54
EVERY 25 HOURS............................................................................................................................................. 54
1. Cleaning the cylinder and cylinder head fins ............................................................................................. 54
2. Cleaning the foam element........................................................................................................................ 55
EVERY 50 HOURS............................................................................................................................................. 55
1. Checking the engine start system ............................................................................................................. 55
2. Checking the OPC system ........................................................................................................................ 56
3. Checking the carbon canister air filter .......................................................................................................57
4. Greasing .................................................................................................................................................... 57
5. Checking the muffler and spark arrester (if equipped)............................................................................... 57
EVERY 100 HOURS........................................................................................................................................... 58
1. Changing the engine oil............................................................................................................................. 58
2. Cleaning the air cleaner paper element..................................................................................................... 58
3. Checking the spark plug ............................................................................................................................ 59
4. Checking the fuel filter and fuel lines......................................................................................................... 59
5. Checking the battery condition ..................................................................................................................60
5.1 Charging the battery........................................................................................................................... 61
5.2 Storing the battery.............................................................................................................................. 62
6. Adjusting the throttle cable ........................................................................................................................62
7. Adjusting the choke cable.......................................................................................................................... 62
8. Greasing mower link bushings .................................................................................................................. 63
EVERY 200 HOURS OR EVERY 1 YEAR.......................................................................................................... 63
1. Replacing the air cleaner paper element................................................................................................... 63
EVERY 200 HOURS........................................................................................................................................... 63
1. Replacing the fuel filter .............................................................................................................................. 63
Z400
3
2. Replacing the engine oil filter .................................................................................................................... 63
EVERY 300 HOURS........................................................................................................................................... 64
1. Adjusting the engine valve clearance ........................................................................................................ 64
2. Cleaning the combustion chamber, lapping the valve seating surface...................................................... 64
EVERY 400 HOURS........................................................................................................................................... 64
1. Replacing the transaxle oil filter cartridge.................................................................................................. 64
2. Changing the transaxle fluid ...................................................................................................................... 65
EVERY 500 HOURS........................................................................................................................................... 65
1. Replacing the spark plug ........................................................................................................................... 65
2. Lubricating the crank shaft ........................................................................................................................ 66
EVERY 500 HOURS OR EVERY 1 YEAR.......................................................................................................... 66
1. Adjusting the electric clutch ....................................................................................................................... 66
EVERY 1 YEAR .................................................................................................................................................. 67
1. Checking fuel lines .................................................................................................................................... 67
2. Checking the muffler and spark arrester (if equipped)............................................................................... 67
3. Checking hydraulic hoses.......................................................................................................................... 67
EVERY 2 YEARS................................................................................................................................................ 67
1. Replacing the carbon canister air filter ......................................................................................................67
EVERY 4 YEARS................................................................................................................................................ 67
1. Replacing hydraulic hoses......................................................................................................................... 67
2. Replacing fuel lines ................................................................................................................................... 67
SERVICE AS REQUIRED................................................................................................................................... 67
1. Replacing fuses ......................................................................................................................................... 67
2. Checking and replacing blades ................................................................................................................. 68
3. Replacing the mower belt .......................................................................................................................... 69
ADJUSTMENT...........................................................................................................................70
MOTION CONTROL LEVER ..............................................................................................................................70
1. Adjusting the motion control lever operating strength ............................................................................... 70
2. HST neutral ............................................................................................................................................... 70
3. Maximum speed (forward)......................................................................................................................... 71
4. Motion control lever alignment................................................................................................................... 71
4.1 Checking the alignment...................................................................................................................... 71
4.2 Aligning the motion control levers ......................................................................................................71
5. Adjusting the mower lift pedal.................................................................................................................... 72
MOWER DECK LEVEL....................................................................................................................................... 72
1. Anti-scalp rollers ........................................................................................................................................ 72
2. Leveling the mower deck (side-to-side)..................................................................................................... 72
3. Leveling the mower deck (front-to-rear) .................................................................................................... 73
GENERAL TORQUE SPECIFICATION ..............................................................................................................75
TIGHTENING TORQUE CHART ........................................................................................................................ 76
STORAGE..................................................................................................................................77
STORING THE MACHINE.................................................................................................................................. 77
REMOVING THE MACHINE FROM STORAGE................................................................................................. 77
TROUBLESHOOTING...............................................................................................................78
ENGINE TROUBLESHOOTING ......................................................................................................................... 78
BATTERY TROUBLESHOOTING....................................................................................................................... 80
MACHINE TROUBLESHOOTING ......................................................................................................................80
MOWER TROUBLESHOOTING......................................................................................................................... 81
INDEX.........................................................................................................................................83
4
Z400
SAFE OPERATION
SAFE OPERATION
Z400
5
Careful operation is your best insurance against an
accident.
Read and understand this manual carefully before
operating the machine. All operators, no matter how
much experience they may have had, must read this
and other related manuals before operating the
machine or any implement attached to it. It is the
owner's obligation to instruct all operators in safe
operation.
If the operator(s) or mechanic(s) cannot understand the
contents, it is the owner's responsibility to explain this
material to them. This mowing machine is capable of
amputating hands, feet and throwing objects. Failure to
observe the following safety instructions could result in
serious injury or death.
BEFORE OPERATING THE
MACHINE
Know your equipment and its limitations. Read all
instructions in this manual before attempting to start
and operate the machine.
1. General
• The zero turn mowing machine has different
steering characteristics than other machines with a
steering wheel and does not have a service brake
pedal. Normal slowing down and stopping is done
with the motion control levers. Read and
understand the operator's manual before operating
the machine. Practice operating the machine at low
engine speed in an unobstructed area without
engaging the mower.
• Pay special attention to the safety labels on the
machine itself.
• Do not allow any bystanders around or near the
machine during operation.
• Do not allow passengers, children or non-qualified
operators on the machine at any time. The operator
must remain in the machine seat throughout
operation.
• Do not operate the machine or any attachments
while under the influence of alcohol, medication,
controlled substances or when fatigued.
• Do not wear loose, torn, or bulky clothing around
the machine. The clothing may catch on moving
parts or controls, leading to the risk of an accident.
Wear and use any additional safety items such as a
hard hat, safety boots or shoes, eye and hearing
protection, gloves and so on, as appropriate or
required.
• Do not wear radio or music headphones while
operating the machine. Do not operate the machine
or any attachments while using or texting with a
cellphone or any other electronic device.
Safe operation requires your full attention.
• Carefully check the vicinity before operating
machine or any implement attached to it. Clear the
work area of objects (such as wires and rocks,) that
might be picked up and thrown. Check for overhead
clearance which may interfere with the grass
catcher or ROPS.
• Check brakes and other mechanical parts for
correct adjustment and wear. Replace worn or
damaged parts promptly. Check the tightness of all
nuts and bolts regularly.
(See MAINTENANCE on page 46 and
ADJUSTMENT on page 70.)
• Keep all shields and guards in place. Replace any
that are damaged or missing. Do not operate
unless they are functioning properly.
• Before allowing other people to use your machine,
explain how to operate and have them read this
manual before operation.
• In addition to the design and configuration of
equipment, hazard control and accident prevention
are dependent upon the awareness, concern and
prudence of personnel involved in the operation,
transport and maintenance of the equipment.
• Keep the machine and attachments in good
operating condition and keep safety devices in
place and in proper working condition. Do not
operate unless they are functioning properly.
• Do not modify the machine. Unauthorized
modification may affect the function of the machine,
which may result in personal injury.
• Use only implements approved by KUBOTA. Use
proper ballast on the front or rear of the machine to
reduce the risk of upsets. Follow the safe operating
procedures specified in the manuals of the
equipment.
• Keep your machine clean. Accumulations of dirt,
grease, and trash can contribute to fires and lead to
personal injury.
• The exhaust gas from the muffler is very hot. To
prevent fire, do not expose dry grass, mowed
grass, oil and any other combustible materials to
the exhaust gas. Use a spark arrester where
required. Keep the engine and muffler clean all the
times.
2. ROPS
SAFE OPERATION
6
Z400
• The ROPS is an integral and effective safety
device.
• KUBOTA recommends the use of a roll-over
protective structure (ROPS) and seat belt in almost
all applications. This combination will reduce the
risk of serious injury or death, should the machine
be upset.
• The machine is equipped with a foldable ROPS,
which may be temporarily folded down only when
absolutely necessary for areas with height
constraints.
There is no operator protection provided by the
ROPS in the folded position. For operator safety the
ROPS must be placed in the upright and locked
position and the seat belt fastened for all other
operations.
• Do not remove the ROPS.
• If the ROPS is loosened or removed for any reason,
make sure that all parts are reinstalled correctly
before operating the machine.
• Never modify or repair a ROPS because welding,
bending, drilling, grinding, or cutting may weaken
the structure.
• If any structural member of the ROPS is damaged,
replace the entire structure at your local KUBOTA
Dealer. Any alterations to a ROPS must be
approved by the manufacturer.
• Check the area to be mowed and never fold down a
folding ROPS in areas where there are slopes,
drop-offs or water.
• Check carefully for overhead clearances (such as
branches, doorways and electrical wires) before
driving under any objects and do not contact them.
• Keep the ROPS in safe operating condition by
periodically and thoroughly inspecting for damage
and keeping all mounting fasteners tight.
• Always use the seat belt if the machine has a
ROPS. Check the seat belt regularly and replace if
frayed or damaged. Be certain that the seat belt
can be released quickly in the event of an
emergency.
(1) ROPS
(2) Seat belt
OPERATING THE MACHINE
1. Starting to operate the machine
• Always sit in the operator's seat when starting the
engine or operating levers or controls.
• Before starting the engine make sure that the
motion control levers are in neutral lock, the parking
brake is applied, and the power take-off (PTO) is
disengaged (OFF).
• Do not start the engine by shorting across starter
terminals. The machine may start in gear and move
if the normal starting circuitry is bypassed.
• Do not operate or idle the engine in a nonventilated area. Carbon monoxide gas is colorless,
odorless, and deadly.
• Do not start the engine when the front or rear tires
are not on the ground.
• Check before each use that the operator presence
control (OPC) system is functioning correctly.
Test the safety systems.
(See Checking the engine start system on page
55 and Checking the OPC system on page 56.)
Do not operate unless they are functioning
correctly.
2. Working the machine
• Do not turn sharply when driving at high speed.
• To avoid tip-over accidents, slow down when
turning on uneven terrain or before stopping.
• Do not operate near ditches, holes, embankments,
or other terrain, which may collapse under the
machine's weight. The risk of machine tip-overs
increases when the ground is loose or wet.
• Park the machine on a firm and level surface.
• Watch where you are going at all times. Watch for
and avoid obstacles. Be alert at curbs, near trees,
and other obstructions and hidden hazards.
• Know what is behind you before backing up. Look
to the rear before and when backing. Do not mow
while in reverse. Operate in reverse with the blades
engaged only when absolutely necessary and make
sure the area immediately behind you is clear of
obstructions or holes, and small children. Use extra
caution when the machine is equipped with a grass
catcher as your view to the rear is restricted.
• When working in groups, always let others know
what you are doing ahead of time.
• Do not drive the machine on streets or highways.
Watch for traffic when you cross roads or operate
near roads.
• Be aware of the mower discharge direction and do
not point it at anyone.
Never operate with the discharge deflector raised,
removed or altered, unless using a grass catcher.
• When using any attachments, never direct
discharge material toward bystanders. Do not allow
people or pets near the attachments while in
SAFE OPERATION
Z400
7
operation.
Do not mow when bystanders are present in the
mowing area.
• To reduce fire hazards, keep the engine exhaust
area free of grass or leaves.
• Be sure that the rotating blades and the engine are
stopped and the key is removed before placing
hands or feet near blades and cleaning blockages
or unclogging the chute. Keep hands and feet away
from the cutting units.
• Shut the engine off and wait for all movement to
stop before removing the grass catcher or
unclogging the chute.
• Maintain all screens to avoid overheating
conditions.
• Always inspect the mower for damage after striking
a foreign object. Repair or replace any damaged
parts before restarting.
• Operate during daylight or in bright artificial light.
• If the machine starts to vibrate abnormally,
disengage the drive to the attachments, stop the
engine and remove the key. Then check the
machine immediately.
• Do not operate the machine when there is a
possibility of lightning. Even if the machine is
equipped with a cabin, the operator is not protected
from lightning.
• Never raise the deck with the blades running.
Disengage the PTO and stop the blades from
rotating if not mowing.
3. Safety for children
Tragic accidents can occur if the operator is not alert of
the presence of children. Children are attracted to the
machine and mowing activity.
• Never assume that children will remain where you
last saw them.
• Keep children out of the mowing area and under
the watchful care of another responsible adult.
• Be alert and turn the machine off if children enter
the area.
• Before and when backing, look behind and down
for small children.
• Never carry children. There is no safe place for
them to ride. They may fall off and be seriously
injured or interfere with safe machine operation.
• Never allow children to operate the machine, even
under adult supervision.
• Use extra care when approaching blind corners,
shrubs, trees, or other obstructions that might hide
children from sight.
• Do not mow in reverse. Operate in reverse with the
blades engaged only when it is absolutely
necessary and make sure that the area to the rear
is clear of children before doing so.
4. Operators, age 60 years and older
Data indicates that operators, age 60 years and older,
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.
5. Pulling loads
Use extra care when pulling loads to reduce the risk of
serious personal injury or death due to a machine tipover.
• Pull only from the hitch. Never attach loads to the
axle housing or any other point above the hitch.
• Limit loads to those you can safely control.
• Do not turn sharply.
• Use care when backing.
• Use front ballast or wheel weights when suggested
in this operator's manual.
– Stopping distance increases with speed and
weight of towed load. Travel slowly and allow
extra time and distance to stop.
– Never allow children or others in, or on, towed
equipment.
– Use additional caution when turning or
operating under adverse surface conditions.
6. Operating on slopes
Slopes are a major factor related to loss-of-control and
tip-over 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.
If the engine stops when operating on a slope, apply
the parking brake immediately to prevent machine
runaway.
Do
• To avoid tip-over accidents, operate across slopes,
not up and down. Stay off hills and slopes too steep
for safe operation.
• Remove obstacles such as rocks and tree limbs.
• 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.
• Follow the manufacturer's recommendations for
wheel weight or counterweights to improve stability.
• Keep all movement on slopes slow and gradual. Do
not make sudden changes in speed or direction.
If tires lose traction, disengage the PTO and
proceed slowly straight down the slope.
• Reduce the speed and exercise extreme caution on
slopes and in sharp turns to prevent tip-over
accidents or loss of control.
• Use special caution when changing direction on
SAFE OPERATION
8
Z400
slopes. Slow down, and use extra caution when
changing direction on a slope.
Do not
• Do not turn on slopes unless necessary. If
necessary, turn uphill slowly and gradually.
• Do not mow near drop-offs, ditches, or
embankments. The mower could suddenly turn
over if a wheel is over the edge of cliff or ditch, or if
an edge caves in.
• Do not mow on wet grass. Reduced traction could
cause sliding and loss of control.
• Do not try to stabilize the machine by putting your
foot on the ground.
• Do not use the grass catcher on steep slopes.
• Do not start or stop suddenly on slopes. If tires lose
traction, disengage the PTO and proceed slowly
straight down the slope.
• Never “freewheel”. Do not let the machine travel
downhill with motion control levers at the neutral
lock position or in neutral.
• Do not operate the machine without the mower
deck installed.
SERVICING AND STORAGE
1. Servicing the machine
• Before servicing, park the machine on a firm, level
surface and apply the parking brake. Remove the
key to prevent an accidental start-up.
• Allow the machine time to cool before touching the
engine, muffler and so on.
• Always stop the engine before refueling. Avoid
spills and overfilling. Wipe up spilled fuel
immediately.
7. Stopping the machine
• Park the machine on level ground.
• Make sure that the machine and all attachments
have come to a complete stop before you get off.
• Before you get off, apply the parking brake, place
the motion control levers in their neutral lock
positions, disengage the PTO, lower all
attachments to the ground, turn off the engine, and
remove the key.
• Do not park the machine on dry grass or leaves.
TRANSPORTING THE MACHINE
• Disengage power to attachment(s) when
transporting or not in use.
• Do not tow this machine. Use a suitable truck or
trailer when transporting on public roads.
• Use extra care when loading or unloading the
machine into a trailer or truck. Use full width ramps
for loading machine into a trailer or truck.
• This machine is not allowed to be used on public
roads.
• Shut off fuel while storing or transporting.
• Tie the machine down securely using straps,
chains, cables, or ropes.
• Both front and rear straps should be directed down
and outward from the machine.
(1) Fuel tank cap
• Use extra care when handling gasoline fuels. They
are flammable.
1. Use only an approved container.
2. Do not remove the fuel cap or refuel with the
engine running. Allow the engine to cool before
refueling. Do not smoke while refueling or when
standing near fuel.
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.
• Do not smoke when working around battery or
when refueling. Extinguish all cigarettes, cigars,
pipes, and other sources of ignition. Keep all sparks
and flames away from battery and fuel tank.
• Never fill containers inside a vehicle or on a truck or
trailer bed with a plastic liner. Always place
containers on the ground away from your vehicle
before filling.
• Remove equipment from the truck or trailer and
refuel it on the ground. If this is not possible, then
refuel such equipment with a portable container,
rather than from a fuel dispenser nozzle. Keep the
nozzle in contact with the rim of the fuel tank or
container opening at all times until fueling is
complete. Do not use a nozzle lock open device.
• If fuel is spilled on clothing, change the clothing
immediately. Replace the fuel cap and tighten
securely.
• Charge batteries in an open, well-ventilated area,
SAFE OPERATION
Z400
9
away from spark and flames. A battery, especially
when charging, will give off hydrogen and oxygen
gases, which can explode and cause serious
personal injury.
• Unplug the charger before connecting or
disconnecting from battery.
• Before “jump starting” a dead battery, read and
observe all of the instructions:
• Disconnect the battery or remove the spark plug
wire before making any repairs.
Disconnect the negative terminal first and the
positive last. Reconnect the positive first and
negative last. Wear protective clothing and use
insulated tools.
• 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.
• Keep a first aid kit and fire extinguisher handy at all
times.
• Never allow untrained personnel to service the
machine. Do not attempt to mount a tire on a rim
unless qualified to do so and all proper safety
precautions are followed.
• Always maintain the correct tire inflation pressure.
Do not inflate tires above the recommended
pressure shown in the operator's manual.
• Mower blades are sharp and can cut your hands.
Wrap the blade(s) or wear gloves, and use extra
caution when servicing them. Never straighten or
weld blades.
• Keep nuts and bolts, especially blade attachment
bolts, tight and keep equipment in good condition.
• Never tamper with safety devices. Check their
operation for proper function regularly.
• Waste products such as used oil, fuel, coolant,
brake fluid, and batteries can harm the
environment, people, pets and wildlife. Please
dispose of the waste products properly.
• Do not use beverage containers for waste fluids or
other products. Someone, particularly children, may
drink them by mistake.
• Securely support the machine or any machine
elements with stands or suitable blocking before
working underneath. For your safety, do not rely on
hydraulically supported devices as they may leak
down, suddenly drop or be accidently lowered.
• Consult your local recycling center or KUBOTA
Dealer to learn how to recycle or get rid of waste
products.
– 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.
2. Storage
• Provide adequate support when changing wheels.
• Make sure that wheel nuts and bolts have been
tightened to the specified torque.
• Keep hands and feet away from moving parts. If
possible, do not make adjustments or repairs with
the engine running.
• Keep the machine free of grass, leaves, or other
debris build-up.
• Do not change the engine governor setting or
overspeed the engine.
• Do not run the machine inside a closed area.
• Keep the machine and supply of fuel in locked
storage and remove the ignition key to prevent
children or others from playing or tampering with
them.
• To avoid sparks from an accidental short circuit,
always disconnect the battery's ground cable (-)
first and reconnect it last.
(1) Battery
(2) Ground cable
(+) Positive terminal
(-) Negative terminal
• To avoid the danger of exhaust fume poisoning, do
SAFE OPERATION
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Z400
not operate the engine indoors without adequate
ventilation.
• To reduce fire hazards, clean the machine
thoroughly before storage. Dry grass and leaves
around the engine and muffler may ignite.
• Let the engine cool before storing and do not store
near flames.
• Shut off fuel while storing or transporting.
SAFETY LABELS
SAFE OPERATION
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SAFE OPERATION
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Z400
SAFE OPERATION
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SAFE OPERATION
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SAFE OPERATION
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15
CARE OF SAFETY LABELS
SAFE OPERATION
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Z400
• Keep safety labels clean and free from obstructing material.
• Clean safety labels with soap and water, and dry with a soft cloth.
• Replace damaged or missing safety labels with new labels from your local KUBOTA Dealer.
• If a component with safety label(s) attached is replaced with a new part, make sure new label(s) is (are) attached
in the same location(s) as the replaced component.
• Attach new safety labels by applying on a clean dry surface and pressing any bubbles to the outside edge.
SERVICING OF MACHINE
Z400
17
After reading this manual thoroughly, you will find that
you can do some of the regular maintenance yourself.
Your dealer has knowledge of your new machine and
has the desire to help you get the best performance
and the most value from it.
When in need of parts or major service, be sure to
consult your local KUBOTA Dealer. When in need of
parts, be prepared to give your dealer the machine,
ROPS, engine and mower serial numbers.
Locate the serial numbers now and record them in the
space provided.
Type Serial no.
Machine
ROPS
Engine
Mower
Date of purchase
Name of dealer
(To be filled in by purchaser)
(1) ROPS serial no.
SERVICING OF MACHINE
(1) Machine identification plate (2) Machine serial no.
(1) Engine serial no.
RCK48P, RCK54P
(1) Mower identification plate
(2) Mower serial no.
SERVICING OF MACHINE WARRANTY
18
Z400
RCK60P
(1) Mower identification plate (2) Mower serial no.
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 instructions given in the operator's manual, even if it
is within the warranty period.
The engine is warranted under the Kawasaki Limited
Warranty, a copy of which has been provided with your
machine purchase.
Refer to the Kawasaki Limited Warranty for details
regarding warranty coverage, owner obligations,
warranty limitations, and liabilities.
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.
SPECIFICATION TABLE SPECIFICATIONS
Z400
19
SPECIFICATIONS
SPECIFICATION TABLE
Model Z411KW Z421KW Z421KWT
Model GH7302V GH7301V GH7301V
Max. engine power (gross) kW (HP) 16.4 (22.0)
Type Air-cooled gasoline engine
Number of cylinders 2 (V-Twin)
Bore and stroke mm (in.) 78 x 76 (3.07 x 2.99)
Engine
Capacities
Dimensions
Weight (with mower deck) kg (lbs.) 388 (856) with 48" 395 (870) with 54" 410 (904) with 60"
Traveling
system
PTO
Specifications and design subject to change without notice.
*1 Manufacturer's estimate
*2 These Kawasaki engines have been tested in accordance with SAE J1995, verified by TÜV Rheinland Group, and certified by SAE Interna-
Total displacement cm3 (cu. in.) 726 (44.3)
Rated revolution rpm 3600
Fuel Unleaded gasoline
Starter Electric
Lubrication Full pressure lubrication
Cooling Air-cooled
Battery U1 (12 V, RC: 45 min, CCA: 300, CA: 410)
Fuel tank L (U.S.gals.) 25.7 (6.8)
Engine crankcase (with filter) L (U.S.qts.) 2.1 (2.2)
Transmission case including
rear axle gear case
Overall length mm (in.) 2055 (80.9)
Overall width without mower
deck
Overall height (with ROPS) mm (in.) 1772 (69.8)
Wheelbase mm (in.) 1255 (49.4)
Min. ground clearance mm (in.) 124 (4.9)
Tread
Tires
Traveling
speeds
Steering 2 - hand levers
Transmission 2 - HST with gear
Parking brake Foot applied, released
Min. turning radius mm (in.) 0 (0)
Drive system Belt
Clutch type Electric
tional. The gross power ratings of these engines were determined by using measurements according to SAE J1995 which were witnessed by
SAE-approved witnesses from TÜV Rheinland Group. Torque ratings of these engines were not certified by SAE. Actual power and torque
Front mm (in.) 944 (37.2)
Rear mm (in.) 1000 (39.4) 1070 (42.1)
Front 13 x 5.0 - 6 (pneumatic tire) smooth
Rear 24 x 9.5 - 14 (4PR) low profile turf
Forward mph (km/h) 0 to 10.0 (0 to 16.0)
Reverse mph (km/h) 0 to 5.0 (0 to 8.0)
L (U.S.qts.) 4.8 (5.1)
mm (in.) 1236 (48.7) 1376 (54.2)
*1*2
17.9 (24.0)
*1*2
*3
17.9 (24.0)
13 x 6.5 - 6 (pneumatic tire)
24 x 12 - 14 (4PR) low pro-
*1*2
smooth
file turf
SPECIFICATIONS
20
Z400
output will vary depending on numerous factors, including, but not limited to, the operating speed of the engine in application, environmental
conditions, maintenance, and other variables.
*3 Oil amount when the oil level is at the upper level.
Model RCK48-400Z RCK54-400Z RCK60-400Z
Suitable machine Z411KW Z421KW Z421KWT
Mounting method Parallel linkage
Adjustment of cutting height Dial gauge
Cutting width mm (in.) 1219 (48) 1372 (54) 1524 (60)
Cutting height mm (in.) 38 to 127 (1.5 to 5.0)
PRO commercial deck
(fabricated
deck)
*1 Engine maximum rpm
Weight (approximation) kg (lbs.) 69 (152) 75 (165) 90 (198)
Blade spindle speed r/s (rpm) 72 (4320)
Blade tip velocity m/s (fpm) 95.5 (18800)
*1
*1
63.7 (3820)
95 (18700)
*1
*1
56.7 (3400)
93 (18300)
Blade length mm (in.) 423 (16.7) 474 (18.7) 523 (20.6)
Number of blades 3
Total length mm (in.) 867 (34.1) 885 (34.8) 925 (36.4)
Dimensions
Total width mm (in.) 1552 (61.1) 1710 (67.3) 1870 (73.6)
Total height mm (in.) 340 (13.3)
*1
*1
IMPLEMENT LIMITATIONS
Z400
21
IMPLEMENT LIMITATIONS
The KUBOTA Machine has been thoroughly tested for proper performance with implements sold or approved by
KUBOTA.
Use with implements below may result in malfunctions or failures of the machine, damage to other property and injury
to the operator or others.
• Implements which are not sold or approved by KUBOTA
• Implements which exceed the maximum specifications listed below, or
• Implements which are otherwise unfit for use with the KUBOTA Machine
Any malfunctions or failures of the machine resulting from use with improper implements are not covered by the
warranty.
Unit
Z411KW, Z421KW 108 kg (238 lbs.) 545 kg (1202 lbs.) 166 kg (366 lbs.) 653 kg (1440 lbs.)
Z421KWT 113 kg (249 lbs.) 555 kg (1225 lbs.) 166 kg (366 lbs.) 668 kg (1473 lbs.)
Maximum loading weight
Implement weight W1 Maximum total weight
Front axle Wf Rear axle Wr
IMPORTANT :
• Do not operate with trailer on an incline greater than 10°.
• Total towed weight must not exceed the combined weight of the pulling machine, ballast and operator.
• Follow the manufacturer's recommendations for weight limits for towed equipment.
Unit
Z411KW, Z421KW 99 kg (218 lbs.) 422 kg (930 lbs.) 521 kg (1148 lbs.) 34 kg (75 lbs.) 113 kg (250 lbs.)
Z421KWT 103 kg (227 lbs.) 433 kg (955 lbs.) 536 kg (1182 lbs.) 34 kg (75 lbs.) 113 kg (250 lbs.)
Maximum loading weight
Maximum total weight Tongue weight W1 Towing capacity W2
Front axle Wf Rear axle Wr
INSTRUMENT PANEL AND CONTROLS
22
Z400
INSTRUMENT PANEL, SWITCHES AND HAND CONTROLS
INSTRUMENT PANEL AND CONTROLS
INSTRUMENT PANEL, SWITCHES AND HAND CONTROLS
Illustrated contents
(1) Parking brake pedal…27, 38
(2) Parking brake lock pedal…27, 38
(3) Motion control lever…27, 36
(4) Seat belt…35
(5) Cup holder…(6) Operator's seat…35
(7) Foldable ROPS…33
(8) Mower lift pedal…41
(9) Cutting height control dial…41
(10) Key switch…29
(11) Choke knob…28
(12) Hour meter…29
(13) PTO switch…43
(14) Throttle lever…35
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