Kubota WSM ZD321 Instruction manual

ZD321,ZD326,ZD331
WORKSHOP MANUAL
ZERO TURN MOWER
KiSC issued 04, 2007 A

TO THE READER
This Workshop Manual has been prepared to provide servicing personnel with
information on the mechanism, service and maintenance of ZD321, ZD326 and ZD331.
It is divided into three parts, "General", "Mechanism" and "Servicing".
■General
Information on the product identification, the general precautions, maintenance
check list, check and maintenance and special tools are described.
■Mechanism
Information on the construction and function are included. This part should be
understood before proceeding with troubleshooting, disassembling and servicing.
Refer to Workshop Manual Diesel Engine, Mechanism (Code No. 9Y021-01874) for
the one which has not been described to this workshop manual.
■Servicing
Information on the troubleshooting, servicing specification lists, tightening torque,
checking and adjusting, disassembling and assembling, and servicing which cover
procedures, precautions, factory specifications and allowable limits.
All information illustrations and specifications contained in this manual are based on
the latest product information available at the time of publication.
The right is reserved to make changes in all information at any time without notice.
Due to covering many models of this manual, information or picture being used have
not been specified as one model.
December 2006
© KUBOTA Corporation 2006
KiSC issued 04, 2007 A

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ZD321, ZD326, ZD331, WSM SAFETY INSTRUCTIONS
SAFETY INSTRUCTIONS
BEFORE SERVICING AND REPAIRING
• Read all instructions and safety instructions in this
manual and on your machine safety decals.
• Clean the work area and machine.
• Park the machine on a firm and level ground, and set
the parking brake.
• Lower the implement to the ground.
• Stop the engine, and remove the key.
• Disconnect the battery negative cable.
• Hang a “DO NOT OPERATE” tag in operator
station.
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 repair or use
this unit.
DANGER : Indicates an imminently hazardous situation which, if not avoided, will result in
death or serious injury.
WARNING : Indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
CAUTION : Indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury.
■IMPORTANT : Indicates that equipment or property damage could result if instructions are not
followed.
■NOTE : Gives helpful information.
KiSC issued 04, 2007 A

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ZD321, ZD326, ZD331, WSM SAFETY INSTRUCTIONS
SAFETY STARTING
• Do not start the engine by shorting across starter
terminals or bypassing the safety start switch.
• Do not alter or remove any part of machine safety
system.
• Before starting the engine, make sure that all shift
levers are in neutral positions or in disengaged
positions.
• Never start the engine while standing on ground.
Start the engine only from operator’s seat.
SAFETY WORKING
• Do not work on the machine while under the influence
of alcohol, medication, or other substances or while
fatigued.
• Wear close fitting clothing and safety equipment
appropriate to the job.
• Use tools appropriate to the work. Makeshift tools,
parts, and procedures are not recommended.
• When servicing is performed together by two or more
persons, take care to perform all work safely.
• Do not work under the machine that is supported
solely by a jack. Always support the machine by
safety stands.
• Do not touch the rotating or hot parts while the engine
is running.
• Never remove the radiator cap while the engine is
running, or immediately after stopping. Otherwise, hot
water will spout out from radiator. Only remove
radiator cap when cool enough to touch with bare
hands. Slowly loosen the cap to first stop to relieve
pressure before removing completely.
• Escaping fluid (fuel or hydraulic oil) under pressure
can penetrate the skin causing serious injury. Relieve
pressure before disconnecting hydraulic or fuel lines.
Tighten all connections before applying pressure.
AVOID FIRES
• Fuel is extremely flammable and explosive under
certain conditions. Do not smoke or allow flames or
sparks in your working area.
• To avoid sparks from an accidental short circuit,
always disconnect the battery negative cable first and
connect it last.
• Battery gas can explode. Keep sparks and open
flame away from the top of battery, especially when
charging the battery.
• Make sure that no fuel has been spilled on the engine.
KiSC issued 04, 2007 A

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ZD321, ZD326, ZD331, WSM SAFETY INSTRUCTIONS
VENTILATE WORK AREA
• If the engine must be running to do some work, make
sure the area is well ventilated. Never run the engine
in a closed area. The exhaust gas contains poisonous
carbon monoxide.
PREVENT ACID BURNS
• Sulfuric acid in battery electrolyte is poisonous. It is
strong enough to burn skin, clothing and cause
blindness if splashed into eyes. Keep electrolyte
away from eyes, hands and clothing. If you spill
electrolyte on yourself, flush with water, and get
medical attention immediately.
DISPOSE OF FLUIDS PROPERLY
• Do not pour fluids into the ground, down a drain, or
into a stream, pond, or lake. Observe relevant
environmental protection regulations when disposing
of oil, fuel, coolant, electrolyte and other harmful
waste.
PREPARE FOR EMERGENCIES
• Keep a first aid kit and fire extinguisher handy at all
times.
• Keep emergency numbers for doctors, ambulance
service, hospital and fire department near your
telephone.
KiSC issued 04, 2007 A

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ZD321, ZD326, ZD331, WSM SAFETY INSTRUCTIONS
The following safety decals are installed on the machine.
If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in
the parts list.
SAFETY DECALS
KiSC issued 04, 2007 A

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ZD321, ZD326, ZD331, WSM SAFETY INSTRUCTIONS
KiSC issued 04, 2007 A

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ZD321, ZD326, ZD331, WSM SAFETY INSTRUCTIONS
KiSC issued 04, 2007 A

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ZD321, ZD326, ZD331, WSM SAFETY INSTRUCTIONS
KiSC issued 04, 2007 A

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ZD321, ZD326, ZD331, WSM SPECIFICATIONS
SPECIFICATIONS
NOTE: Specifications and design subject to change without notice.
*1 : Manufacurer’s estimate
[N] : Narrow tread
[S] : Special
[P] : Semi-pneumatic Non Flat Tire
[LP] : Long wheel base and equipped with 72 in. mower.
*2 : At 3200 min-1 (rpm) [ZD321, ZD326]
At 3000 min-1 (rpm) [ZD331]
*3 : Oil amount when the oil level is at the upper level.
Model ZD321N ZD321 ZD326S ZD326P ZD331P ZD331LP
Engine
Model D782-E2-ZD D1005-E2-ZD-2 D1305-E3-ZD
Maximum engine power
(Gross) 15.7 kW (21 HP)*1 19.4 kW (26 HP)*1 23.1 kW (31 HP)*1
Type Liquid-cooled
Number of cylinders 3
Bore and stroke 67 x 73.6 mm
(2.64 x 2.90 in.) 76 x 73.6 mm (2.99 x 2.90 in.) 78 x 88.0 mm (3.07 x 3.46 in.)
Total displacement 778 cm3(47.5 cu.in.) 1001 cm3(61.1 cu.in.) 1261 cm3(77.0 cu.in.)
Rated revolution 3200 min-1 (rpm) 3000 min-1 (rpm)
Fuel Diesel fuel No. 1 [below – 10 °C (14 °F)]
Diesel fuel No. 2 [above – 10 °C (14 °F)]
Starter Electric starter with battery, glow plug, 12 V, 1.1 kW
Lubrication Forced lubrication by gear pump
Cooling Liquid with pressurized radiator
Battery 51 R (12 V, RC : 70 min, CCA : 450 A)
Capacities
Fuel tank 49 L (13 U.S.gals, 11 lmp.gals)
Engine crankcase
(with filter) 3.5 L (3.70 U.S.qts, 3.08 Imp.qts) 3.9 L (4.1 U.S.qts, 3.4 Imp.qts) 5.7 L (6.0 U.S.qts, 5.0 Imp.qts)
Engine coolant 2.7 L
(2.85 U.S.qts, 2.38 Imp.qts) 3.5 L (3.70 U.S.qts, 3.08 Imp.qts)
Recovery tank 0.25 L (0.26 U.S.qts, 0.22 Imp.qts)
Transmission including rear
axle gear case 12.1 L (12.8 U.S.qts, 10.6 Imp.qts)*3
Dimensions
Overall length 2185 mm (56.0 in.) 2220 mm (87.4 in.) 2335 mm
(91.9 in.)
Overall width Without mower
deck
1365 mm
(53.7 in.) 1460 mm (57.5 in.)
Overall
height
With ROPS
upright
1915 mm (75.4 in.)
With ROPS
folded 1555 mm (61.2 in.)
Wheel base 1410 mm (55.5 in.) 1525 mm
(60.0 in.)
Minimum ground clearance 130 mm (5.12 in.)
with 54 in., 60 in. 130 mm (5.12 in.) with 60 in. 130 mm (5.12 in.) with 60 in., 72 in.
Tread Front 975 mm (38.4 in.) 1070 mm
(42.1 in.)
Rear 1100 mm
(43.3 in.) 1150 mm (45.3 in.)
KiSC issued 04, 2007 A