wsm STW37 Instruction manual

STW34,STW37,STW40
WORKSHOP MANUAL
TRACTOR
KiSC issued 11, 2014 A

TO THE READER
This Workshop Manual tells the servicing personnel about the mechanism, servicing and
maintenance of the STW34, STW37 and STW40. It contains 4 parts: "Information", "General",
"Mechanism" and "Servicing".
Information
This section primarily contains information below.
• Safety First
• Safety Decal
• Specifications
• Dimensions
General
This section primarily contains information below.
• Engine Identification
• Model Identification
• General Precautions
• Maintenance Check List
• Check and Maintenance
• Special Tools
Mechanism
This section contains information on the structure and the function of the unit. Before you continue
with the subsequent sections, make sure that you read this section.
Refer to the latest version of Workshop Manual (Code No. 9Y021-01870 / 9Y021-18200) for the
diesel engine / tractor mechanism that this workshop manual does not include.
Servicing
This section primarily contains information below.
• Troubleshooting
• Servicing Specifications
• Tightening Torques
• Checking, Disassembling and Servicing
All illustrations, photographs and specifications contained in this manual are of the newest
information available at the time of publication.
KUBOTA reserves the right to change all information at any time without notice.
Since this manual includes many models, information or illustrations and photographs can show
more than one model.
September, 2014
© KUBOTA Corporation 2014
KiSC issued 11, 2014 A

Record of Revisions
For pdf, use search function {Search word} to find all the revised locations.
Last digit
of the
Code No.
Issue
month Main Revised Point and Corrective Measures {Search word} Reference
Page
12014.11 Correction of specifications. I-8, G-8,
G-19,
1-S21,
1-S31,
2-S6,
2-S15,
3-S16,
3-S30,
4-S4,
4-S10,
5-S5, 5-S11
Correction of air conditioner belt tension free play. G-31,
10-S5,
10-S23
Correction of hydraulic pump allowable limit. 8-S3, 8-S7,
8-S9
KiSC issued 11, 2014 A

I INFORMATION
KiSC issued 11, 2014 A

CONTENTS
1. SAFETY FIRST .............................................................................................................................. I-1
2. SAFETY DECALS .......................................................................................................................... I-4
3. SPECIFICATIONS.......................................................................................................................... I-8
4. TRAVELLING SPEEDS................................................................................................................ I-10
5. DIMENSIONS ............................................................................................................................... I-11
INFORMATION
KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-1
1. SAFETY FIRST
WSM000001INI0001US1
BEFORE YOU START SERVICE
• 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 stable and level ground, and
set the parking brake.
• Lower the implement to the ground.
• Stop the engine, then remove the key.
• Disconnect the battery negative cable.
• Hang a "DO NOT OPERATE" tag in the operator
station.
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START SAFELY
• Do not do the procedures below when you start the
engine.
– short across starter terminals
– bypass the safety start switch
• Do not alter or remove any part of machine safety
system.
• Before you start the engine, make sure that all shift
levers are in neutral positions or in disengaged
positions.
• Do not start the engine when you stay on the ground.
Start the engine only from operator's seat.
WSM000001INI0015US0
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 try 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 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-2
OPERATE SAFELY
• Do not use the machine after you consume alcohol
or medication or when you are tired.
• Put on applicable clothing and safety equipment.
• Use applicable tools only. Do not use alternative
tools or parts.
• When 2 or more persons do servicing, make sure
that you do it safely.
• Do not operate below the machine that only a jack
holds. Always use a safety stand to hold the
machine.
• Do not touch the hot parts or parts that turn when the
engine operates.
• Do not remove the radiator cap when the engine
operates, or immediately after it stops. If not, hot
water can spout out from the radiator. Only remove
the radiator cap when it is at a sufficiently low
temperature to touch with bare hands. Slowly loosen
the cap to release the pressure before you remove it
fully.
• Released fluid (fuel or hydraulic oil) under pressure
can cause damage to the skin and cause serious
injury. Release the pressure before you disconnect
hydraulic or fuel lines. Tighten all connections before
you apply the pressure.
• Do not open a fuel system under high pressure.
The fluid under high pressure that stays in fuel lines
can cause serious injury. Do not disconnect or repair
the fuel lines, sensors, or any other components
between the fuel pump and injectors on engines with
a common rail fuel system under high pressure.
• Put on an applicable ear protective device (earmuffs
or earplugs) to prevent injury against loud noises.
• Be careful about electric shock. The engine
generates a high voltage of more than DC100 V in
the ECU and is applied to the injector.
WSM000001INI0012US0
PREVENT A FIRE
• Fuel is very flammable and explosive under some
conditions. Do not smoke or let flames or sparks in
your work area.
• To prevent sparks from an accidental short circuit,
always disconnect the battery negative cable first
and connect it last.
• The battery gas can cause an explosion. Keep the
sparks and open flame away from the top of battery,
especially when you charge the battery.
• Make sure that you do not spill fuel on the engine.
WSM000001INI0005US0
KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-3
KEEP A GOOD AIRFLOW IN THE WORK AREA
• If the engine is in operation, make sure that the area
has good airflow. Do not operate the engine in a
closed area. The exhaust gas contains poisonous
carbon monoxide.
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DISCARD FLUIDS CORRECTLY
• Do not discard fluids on the ground, down the drain,
into a stream, pond, or lake. Obey related
environmental protection regulations when you
discard oil, fuel, coolant, electrolyte and other
dangerous waste.
WSM000001INI0007US0
PREVENT ACID BURNS
• Keep electrolyte away from your eyes, hands and
clothing. Sulfuric acid in battery electrolyte is
poisonous and it can burn your skin and clothing and
cause blindness. If you spill electrolyte on yourself,
clean yourself with water, and get medical aid
immediately.
WSM000001INI0008US0
PREPARE FOR EMERGENCIES
• Keep a first aid kit and fire extinguisher ready at all
times.
• Keep the emergency contact telephone numbers
near your telephone at all times.
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KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-4
2. SAFETY DECALS
The following safety decals (pictorial safety labels) 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.
WSM000001INI0014US0
9Y1211109INI0001US0
KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-5
9Y1211109INI0002US0
KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-6
9Y1211109INI0003US0
KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-7
9Y1211109INI0004US0
CARE OF PICTORIAL SAFETY LABELS
1. Keep pictorial safety labels clean and free from obstructing material.
2. Clean pictorial safety labels with soap and water, dry with a soft cloth.
3. Replace damaged or missing pictorial safety labels with new labels.
4. If a component with pictorial safety label(s) affixed is replaced with new part, make sure new label(s) is (are)
attached in the same location(s) as the replace component.
5. Mount new pictorial safety labels by applying on a clean dry surface and pressing any bubbles to outside edge.
9Y1211109INI0005US0
KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-8
3. SPECIFICATIONS
Model STW34 STW37 STW40
Engine power ECE-R24
[97/68/EC]
23.6 kW (32.1 PS)
[24.5 kW (33.3 PS)]
25.9 kW (35.2 PS)
[26.9 kW (36.6 PS)]
27.3 kW (37.1 PS)
[28.3 kW (38.5 PS)]
Engine power SAE gross*1 24.9 kW (33.9 PS) 27.3 kW (37.1 PS) 28.7 kW (39.0 PS)
PTO power *1 16.6 kW (22.6 PS) 19.0 kW (25.9 PS) 20.4 kW (27.8 PS)
Engine
Model D1703 D1803 D1803
Type ETVCS, water-cooled 4-cycle diesel
Number of cylinders 3
Bore and stroke 87 × 92.4 mm
(3.45 × 3.64 in.)
87 × 102.4 mm
(3.43 × 4.031 in.)
87 × 102.4 mm
(3.43 × 4.031 in.)
Total displacement 1.647 cm3 (100.5 cu.in.) 1.826 cm3 (111.4 cu.in.) 1.826 cm3 (111.4 cu.in.)
Rated revolution 2700 min-1 (rpm)
Maximum torque 102.8 N·m
(10.5 kgf·m, 75.8 lbf·ft)
113.9 N·m
(11.6 kgf·m, 84.0 lbf·ft)
121.8 N·m
(12.2 kgf·m, 89.8 lbf·ft)
Battery 12 V, RC: 123 min, CCA: 490A
Capacities
Fuel tank 29.5 L (7.79 U.S.gals, 6.49 Imp.gals)
Coolant (with
recovery tank)
ROPS 6.6 L (7.0 U.S.qts, 5.8 Imp.qts)
CAB 7.1 L (7.5 U.S.qts, 6.2 Imp.qts)
Engine crankcase (with filter) 5.7 L
(6.0 U.S.qts, 5.0 Imp.qts) 6.7 L (7.1 U.S.qts, 5.9 Imp.qts)
Transmission case 24 L (6.3 U.S.gals, 5.3 Imp.gals)
Tires Front Farm: 6.00-12 / Turf: 24 × 8.50-14
Rear Farm: 9.5-22 / Turf: 13.6-16
Dimensions
Overall length (with 3P) 2940 mm (115.7 in.)
Overall width (min. tread) Farm: 1185 mm (46.65 in.) / Turf: 1335 mm (52.56 in.)
Overall height ROPS Farm: 2350 mm (92.52 in.) / Turf: 2340 mm (92.13 in.)
CAB Farm: 2165 mm (85.24 in.) / Turf: 2155 mm (84.84 in.)
Wheel base 1610 mm (63.39 in.)
Min. ground clearance
(Mid PTO case) Farm: 235 mm (9.25 in.) / Turf: 225 mm (8.86 in.)
Tread
Front 1020 mm (40.16 in.)
Rear Farm: 950 mm (37.4 in.), 1070 mm (42.134 in.) /
Turf: 990 mm (39.0 in.), 1055 mm (41.54 in.)
Weight ROPS Farm: 1105 kg (2436 lbs) / Turf: 1130 kg (2491 lbs)
CAB Farm: 1250 kg (2756 lbs) / Turf: 1275 kg (2811 lbs)
Min. turning radius with brake 2.2 m (87 in.)
without brake 2.5 m (98 in.)
Traveling system
Clutch Single dry disk
Steering Hydrostatic Power Steering
Transmission Main-hydrostatic transmission; range gear shift, 3 forward and 3 reverse
Braking system Wet disk type
Trailer brake applicable
Trailer brake coupler applicable
Differential Bevel gear
Hydraulic unit
Hydraulic control system Position control system
Pump capacity 30 L/min
3-point hitch SAE Category 1
Max. lift force
at lift point 11280 N (1150 kgf, 2535 lbf)
24 in.
(600 mm)
behind lift
point
8730 N (890 kgf, 1960 lbf)
Remote control valve coupler JISB-2351-1
PTO
Rear-PTO SAE 1-3/8, 6 splines
PTO / Engine speed 540 / 2670, 800 / 2717
Mid-PTO USA No.5 (KUBOTA 10-tooth) involute spline
PTO / Engine speed 2500 min-1 (rpm) / 2734 min-1 (rpm)
The level of protection against hazardous
substances *2 Category 1
KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-9
The company reserve the right to change the specifications without notice.
NOTE
• *1 Manufacturer's estimate
*2 According to EN 15695-1:2009
*3 Measured according to Directive 2009/76/EC ANNEX ll
*4 Measured according to Directive 2009/63/EC
*5 Measured according to Directive 78/764/EEC
9Y1211109INI0006US0
Noise at the operator's ear *3
ROPS 83.8 dB (A) 85.8 dB (A)
CAB/door
closed 84.4 dB (A) 84.4 dB (A)
CAB/door
opened 84.5 dB (A) 84.5 dB (A)
Noise of the tractor in motion *4 ROPS 78 dB (A) 79 dB (A)
CAB 78 dB (A) 79 dB (A)
Value of the
vibration level *5
GRAMMER
MSG83/511
Light driver 1.13 m/s2
Heavy driver 1.00 m/s2
GRAMMER
MSG93/511
Light driver 1.21 m/s2
Heavy driver 1.05 m/s2
COBO
SC74/M91
Light driver 1.13 m/s2
Heavy driver 0.75 m/s2
COBO
SC74/M97
Light driver 1.21 m/s2
Heavy driver 0.98 m/s2
Model STW34 STW37 STW40
KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-10
4. TRAVELLING SPEEDS
(At rated engine speed)
The company reserves the right to change the specifications without notice.
9Y1211109INI0007US0
Model STW34, STW37, STW40
Tire Size (Rear) 9.5-22 13.6-16
Range gear shift lever km/h (mile/h) km/h (mile/h)
Forward
1 (Low) 0 to 7.9
(0 to 4.9)
0 to 7.8
(0 to 4.8)
2 (Middle) 0 to 12.2
(0 to 7.58)
0 to 12.0
(0 to 7.45)
3 (High) 0 to 34.1
(0 to 21.1)
0 to 33.5
(0 to 20.8)
Max. Speed
(at 2700 engine rpm)
34.1
(21.2)
33.5
(20.8)
Reverse
1 (Low) 0 to 6.1
(0 to 3.7)
0 to 6.0
(0 to 3.7)
2 (Middle) 0 to 9.4
(0 to 5.8)
0 to 9.3
(0 to 5.7)
3 (High) 0 to 26.2
(0 to 16.2)
0 to 25.8
(0 to 16.0)
Max. Speed
(at 2700 engine rpm)
26.2
(16.3)
25.8
(16.0)
KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-11
5. DIMENSIONS
ROPS
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KiSC issued 11, 2014 A

INFORMATION
STW34, STW37, STW40, WSM
I-12
CABIN
9Y1211109INI0009US0
KiSC issued 11, 2014 A

G GENERAL
KiSC issued 11, 2014 A

CONTENTS
1. TRACTOR IDENTIFICATION....................................................................................................... G-1
2. GENERAL PRECAUTION ............................................................................................................G-2
3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING .................................... G-3
[1] WIRING .................................................................................................................................. G-3
[2] BATTERY ............................................................................................................................... G-5
[3] FUSE ...................................................................................................................................... G-5
[4] CONNECTOR ........................................................................................................................ G-5
[5] HANDLING OF CIRCUIT TESTER ........................................................................................ G-6
[6] COLOR OF WIRING ..............................................................................................................G-7
4. LUBRICANTS, FUEL AND COOLANT......................................................................................... G-8
5. TIGHTENING TORQUES........................................................................................................... G-10
[1] GENERAL USE SCREWS, BOLTS AND NUTS .................................................................. G-10
[2] STUD BOLTS ....................................................................................................................... G-10
[3] HYDRAULIC FITTINGS ....................................................................................................... G-11
(1) Hydraulic Hose Fittings................................................................................................... G-11
(2) Hydraulic Pipe Cap Nuts ................................................................................................ G-11
(3) Adaptors, Elbows and Others......................................................................................... G-11
[4] METRIC SCREWS, BOLTS AND NUTS .............................................................................. G-12
[5] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF
THREADS ............................................................................................................................ G-12
[6] PLUGS ................................................................................................................................. G-12
6. MAINTENANCE CHECK LIST ................................................................................................... G-13
7. CHECK AND MAINTENANCE ................................................................................................... G-15
[1] DAILY CHECK...................................................................................................................... G-15
[2] CHECK POINTS OF INITIAL 50 HOURS ............................................................................ G-16
[3] CHECK POINTS OF EVERY 50 HOURS ............................................................................ G-20
[4] CHECK POINTS OF EVERY 100 HOURS .......................................................................... G-24
[5] CHECK POINTS OF EVERY 200 HOURS .......................................................................... G-30
[6] CHECK POINTS OF EVERY 400 HOURS .......................................................................... G-33
[7] CHECK POINT OF EVERY 600 HOURS............................................................................. G-33
[8] CHECK POINT OF EVERY 800 HOURS............................................................................. G-33
[9] CHECK POINTS OF EVERY 1 YEAR.................................................................................. G-33
[10]CHECK POINTS OF EVERY 2 YEARS ............................................................................... G-34
[11]OTHERS............................................................................................................................... G-37
8. SPECIAL TOOLS ....................................................................................................................... G-41
[1] SPECIAL TOOLS FOR ENGINE.......................................................................................... G-41
[2] SPECIAL TOOLS FOR TRACTOR ...................................................................................... G-47
9. TIRES ......................................................................................................................................... G-50
[1] TIRE PRESSURE................................................................................................................. G-50
[2] TREAD ................................................................................................................................. G-51
(1) Front Wheels .................................................................................................................. G-52
(2) Rear Wheels................................................................................................................... G-52
[3] TIRE LIQUID INJECTION .................................................................................................... G-53
GENERAL
KiSC issued 11, 2014 A

GENERAL
STW34, STW37, STW40, WSM
G-1
1. TRACTOR IDENTIFICATION
When you contact local KUBOTA distributor, always specify
engine serial number, the tractor serial number and hour meter
reading.
9Y1211109GEG0001US0
(1) Tractor Identification Plate
(2) Tractor Serial Number
(3) Engine Serial Number
KiSC issued 11, 2014 A