wsm STW37, STW34, STW40 Workshop Manual

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Page 1

WORKSHOP MANUAL

KiSC issued 11, 2014 A

TRACTOR

STW34,STW37,STW40

Page 2

TO THE READER

KiSC issued 11, 2014 A

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

Page 3

Record of Revisions

KiSC issued 11, 2014 A

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}

1 2014.11 Correction of specifications. I-8, G-8,

5-S5, 5-S11

Correction of air conditioner belt tension free play. G-31,

Correction of hydraulic pump allowable limit. 8-S3, 8-S7,

Reference

Page

G-19, 1-S21, 1-S31,

2-S6, 2-S15, 3-S16, 3-S30,

4-S4, 4-S10,

10-S5,

10-S23

8-S9

Page 4

I INFORMATION

KiSC issued 11, 2014 A

Page 5

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

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SAFETY FIRST

DANGER

WARNING

CAUTION

IMPORTANT

NOTE

KiSC issued 11, 2014 A

INFORMATION

1. 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.

• 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, may result in minor or moderate injury.

• Indicates that equipment or property damage could result if instructions are not followed.

• Gives helpful information.

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.

WSM000001INI0010US0

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.

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KiSC issued 11, 2014 A

INFORMATION

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.

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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.

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KiSC issued 11, 2014 A

INFORMATION

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.

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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.

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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

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

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KiSC issued 11, 2014 A

INFORMATION

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KiSC issued 11, 2014 A

INFORMATION

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KiSC issued 11, 2014 A

INFORMATION

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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

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KiSC issued 11, 2014 A

INFORMATION

3. SPECIFICATIONS

Model STW34 STW37 STW40

Engine power ECE-R24 [97/68/EC]

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)

Model D1703 D1803 D1803

Type ETVCS, water-cooled 4-cycle diesel

Number of cylinders 3

Bore and stroke

Engine

Capacities

Dimensions

Tread

Weight

Min. turning radius

Traveling system

Hydraulic unit

PTO

The level of protection against hazardous substances *2

Total displacement 1.647 cm

Rated revolution 2700 min

Maximum torque

Battery 12 V, RC: 123 min, CCA: 490A

Fuel tank 29.5 L (7.79 U.S.gals, 6.49 Imp.gals)

Coolant (with recovery tank)

Engine crankcase (with filter)

Transmission case 24 L (6.3 U.S.gals, 5.3 Imp.gals)

Tires

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

Wheel base 1610 mm (63.39 in.)

Min. ground clearance (Mid PTO case)

with brake 2.2 m (87 in.)

without brake 2.5 m (98 in.)

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 control system Position control system

Pump capacity 30 L/min

3-point hitch SAE Category 1

Max. lift force

Remote control valve coupler JISB-2351-1

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

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)

Front Farm: 6.00-12 / Turf: 24 × 8.50-14

Rear Farm: 9.5-22 / Turf: 13.6-16

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.)

Front 1020 mm (40.16 in.)

Rear

ROPS Farm: 1105 kg (2436 lbs) / Turf: 1130 kg (2491 lbs)

CAB Farm: 1250 kg (2756 lbs) / Turf: 1275 kg (2811 lbs)

at lift point 11280 N (1150 kgf, 2535 lbf)

24 in. (600 mm) behind lift point

23.6 kW (32.1 PS)

[24.5 kW (33.3 PS)]

87 × 92.4 mm

(3.45 × 3.64 in.)

(100.5 cu.in.) 1.826 cm3 (111.4 cu.in.) 1.826 cm3 (111.4 cu.in.)

102.8 N·m

(10.5 kgf·m, 75.8 lbf·ft)

5.7 L

(6.0 U.S.qts, 5.0 Imp.qts)

Farm: 235 mm (9.25 in.) / Turf: 225 mm (8.86 in.)

Farm: 950 mm (37.4 in.), 1070 mm (42.134 in.) /

Turf: 990 mm (39.0 in.), 1055 mm (41.54 in.)

25.9 kW (35.2 PS)

[26.9 kW (36.6 PS)]

87 × 102.4 mm

(3.43 × 4.031 in.)

-1

(rpm)

113.9 N·m

(11.6 kgf·m, 84.0 lbf·ft)

6.7 L (7.1 U.S.qts, 5.9 Imp.qts)

8730 N (890 kgf, 1960 lbf)

-1

(rpm) / 2734 min-1 (rpm)

Category 1

27.3 kW (37.1 PS)

[28.3 kW (38.5 PS)]

87 × 102.4 mm

(3.43 × 4.031 in.)

121.8 N·m

(12.2 kgf·m, 89.8 lbf·ft)

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STW34, STW37, STW40, WSM

NOTE

KiSC issued 11, 2014 A

Model STW34 STW37 STW40

ROPS 83.8 dB (A) 85.8 dB (A)

Noise at the operator's ear *3

Noise of the tractor in motion *4

GRAMMER MSG83/511

GRAMMER

Value of the vibration level *5

MSG93/511

COBO SC74/M91

COBO SC74/M97

CAB/door closed

CAB/door opened

ROPS 78 dB (A) 79 dB (A)

CAB 78 dB (A) 79 dB (A)

Light driver 1.13 m/s

Heavy driver 1.00 m/s

Light driver 1.21 m/s

Heavy driver 1.05 m/s

Light driver 1.13 m/s

Heavy driver 0.75 m/s

Light driver 1.21 m/s

Heavy driver 0.98 m/s

84.4 dB (A) 84.4 dB (A)

84.5 dB (A) 84.5 dB (A)

The company reserve the right to change the specifications without notice.

• *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

INFORMATION

9Y1211109INI0006US0

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KiSC issued 11, 2014 A

4. TRAVELLING SPEEDS

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)

1 (Low)

2 (Middle)

Forward

3 (High)

Max. Speed

(at 2700 engine rpm)

1 (Low)

2 (Middle)

Reverse

3 (High)

Max. Speed

(at 2700 engine rpm)

0 to 7.9

(0 to 4.9)

0 to 12.2

(0 to 7.58)

0 to 34.1

(0 to 21.1)

34.1

(21.2)

0 to 6.1

(0 to 3.7)

0 to 9.4

(0 to 5.8)

0 to 26.2

(0 to 16.2)

26.2

(16.3)

INFORMATION

(At rated engine speed)

0 to 7.8

(0 to 4.8)

0 to 12.0

(0 to 7.45)

0 to 33.5

(0 to 20.8)

33.5

(20.8)

0 to 6.0

(0 to 3.7)

0 to 9.3

(0 to 5.7)

0 to 25.8

(0 to 16.0)

25.8

(16.0)

The company reserves the right to change the specifications without notice.

9Y1211109INI0007US0

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KiSC issued 11, 2014 A

5. DIMENSIONS

ROPS

INFORMATION

9Y1211109INI0008US0

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KiSC issued 11, 2014 A

CABIN

INFORMATION

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G GENERAL

KiSC issued 11, 2014 A

Page 19

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 ................................................................................................................

SPECIAL

[1]

[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

TOOLS FOR ENGINE .......................................................................................... G-41

....... G-41

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STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

1. TRACTOR IDENTIFICATION

When you contact local KUBOTA distributor, always specify engine serial number, the tractor serial number and hour meter reading.

(1) Tractor Identification Plate (2) Tractor Serial Number

GENERAL

(3) Engine Serial Number

9Y1211109GEG0001US0

G-1

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STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

2. GENERAL PRECAUTION

• When you disassemble, carefully put the parts in a clean area to make it easy to find the parts. You must install the screws, bolts and nuts in their initial position to prevent the reassembly errors.

• When it is necessary to use special tools, use KUBOTA special tools. Refer to the drawings when you make special tools that you do not use frequently.

• Before you disassemble or repair machine, make sure that you always disconnect the ground cable from the battery first.

• Remove oil and dirt from parts before you measure.

• Use only KUBOTA genuine parts for replacement to keep the machine performance and to make sure of safety.

• You must replace the gaskets and O-rings when you assemble again. Apply grease (1) to new O-rings or oil seals before you assemble.

• When you assemble the external or internal snap rings, make sure that the sharp edge (3) faces against the direction from which force (2) is applied.

• When inserting spring pins, their splits must face the direction from which a force is applied. See the figure left side.

• To prevent damage to the hydraulic system, use only specified fluid or equivalent.

• Clean the parts before you measure them.

• Tighten the fittings to the specified torque. Too much torque can cause damage to the hydraulic units or the fittings. Not sufficient torque can cause oil leakage.

• When you use a new hose or pipe, tighten the nuts to the specified torque. Then loosen (approx. by 45 °) and let them be stable before you tighten to the specified torque (This is not applied to the parts with seal tape).

• When you remove the two ends of a pipe, remove the lower end first.

• Use two pliers in removal and installation. One to hold the stable side, and the other to turn the side you remove to prevent twists.

• Make sure that the sleeves of flared connectors and tapers of hoses are free of dust and scratches.

• After you tighten the fittings, clean the joint and apply the maximum operation pressure 2 to 3 times to check oil leakage.

(1) Grease (2) Force (3) Sharp Edge (4) Axial Force (5) Rotating Movement

GENERAL

(A) External Circlip (B) Internal Circlip

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STW34, STW37, STW40, WSM

IMPORTANT

KiSC issued 11, 2014 A

GENERAL

3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING

To ensure safety and prevent damage to the machine and surrounding equipment, obey the following precautions in handling electrical parts and wiring.

• Check electrical wiring for damage and loosened connection every year. To this end, educate the customer to do his or her own check and at the same time recommend the dealer to perform periodic check for a fee.

• Do not try to modify or remodel any electrical parts and wiring.

• When removing the battery cables, disconnect the negative cable first. When installing the battery cables, connect the positive cable first.

(1) Negative Terminal (2) Positive Terminal

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[1] WIRING

• Securely tighten wiring terminals.

(1) Correct

(Securely Tighten)

(2) Incorrect

(Loosening Leads to Faulty Contact)

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• Do not let wiring contact dangerous part.

(1) Dangerous Part (Sharp Edge) (2) Wiring (Incorrect)

(3) Wiring (Correct) (4) Dangerous Part

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• Repair or change torn or aged wiring immediately.

(1) Aged (2) Torn

(3) Insulating Vinyl Tape

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KiSC issued 11, 2014 A

GENERAL

• Securely insert grommet.

(1) Grommet (A) Correct

(B) Incorrect

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• Securely clamp, being careful not to damage wiring.

(1) Clamp

(Wind Clamp Spirally)

(2) Wire Harness

(3) Clamp (4) Welding Dent

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• Clamp wiring so that there is no twist, unnecessary sag, or excessive tension, except for movable part, where sag be required.

(1) Wiring (2) Clamp

(A) Correct (B) Incorrect

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• In installing a part, be careful not to get wiring caught by it.

(1) Wiring (A) Incorrect

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• After installing wiring, check protection of terminals and clamped condition of wiring.

(1) Cover

(Securely Install Cover)

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STW34, STW37, STW40, WSM

DANGER

KiSC issued 11, 2014 A

[2] BATTERY

GENERAL

• Be careful not to confuse positive and negative terminal posts.

• When you remove battery cables, disconnect negative cable first. When you install battery cables, check for polarity and connect positive cable first.

• Do not install any battery with capacity other than is specified (Ah).

• After you connect cables to battery terminal posts, apply high temperature grease to them and securely install terminal covers on them.

• Do not allow dirt and dust to collect on battery.

To avoid serious injury or death:

• Be careful not to let battery liquid spill on your skin and clothes. If contaminated, wash it off with water immediately.

• Before you recharge the battery, remove it from the machine.

• Before you recharge, remove cell caps.

• Recharge in a well-ventilated place where there is no open flame nearby, as hydrogen gas and oxygen are formed.

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[3] FUSE

[4] CONNECTOR

• Use fuses with specified capacity. Neither too large nor small capacity fuse is acceptable.

• Never use steel nor copper wire in place of fuse.

• Do not install working light, radio set, etc. on machine which is not provided with reserve power supply.

• Do not install accessories if fuse capacity of reserve power supply is exceeded.

(1) Fuse (2) Fusible Link

(3) Slow Blow Fuse

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• For connector with lock, push lock to separate.

(A) Push

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• In separating connectors, do not pull wire harnesses.

• Hold connector bodies to separate.

(A) Correct (B) Incorrect

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KiSC issued 11, 2014 A

GENERAL

• Use sandpaper to remove rust from terminals.

• Repair deformed terminal. Make sure that there is no terminal being exposed or displaced.

(1) Exposed Terminal (2) Deformed Terminal

(3) Sandpaper (4) Rust

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• Make sure that there is no female connector being too open.

(A) Correct (B) Incorrect

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• Make sure that plastic cover is large enough to cover whole connector.

(1) Cover (A) Correct

(B) Incorrect

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[5] HANDLING OF CIRCUIT TESTER

• Use tester correctly following manual provided with tester.

• Check for polarity and range.

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G-6

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KiSC issued 11, 2014 A

[6] COLOR OF WIRING

GENERAL

• Colors of wire are specified to the color codes.

• This symbol of "/" shows color with stripe(s).

(An example)

Red stripe on white color: W/R

Color of wiring Color code

Black B

Brown Br

Green G

Gray Gy or Gr

Blue L

Light Green Lg

Orange Or

Pink P

Purple Pu or V

Red R

Sky Blue Sb

White W

Yell ow Y

(1) Wire Color (2) Stripe

WSM000001GEG0079US0

G-7

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STW34, STW37, STW40, WSM

NOTE

KiSC issued 11, 2014 A

4. LUBRICANTS, FUEL AND COOLANT

GENERAL

No. Place

1Fuel

Coolant (with

recovery tank)

Engine crankcase

(with filter)

4 Transmission case

Front axle case oil

[4WD]

ROPS

CABIN

Capacity

STW34 STW37 STW40

29.5 L

7.79 U.S.gals

6.49 Imp.gals

6.6 L

7.0 U.S.qts

5.8 Imp.qts

7.1 L

7.5 U.S.qts

6.2 Imp.qts

5.7 L

6.0 U.S.qts

5.0 Imp.qts

24 L

6.3 U.S.gals

5.3 Imp.gals

4.5 L

4.8 U.S.qts

4.0 Imp.qts

6.7 L

7.1 U.S.qts

5.9 Imp.qts

Lubricants, fuel and coolant

• No. 2-D diesel fuel

• No. 1-D diesel fuel if temperature is below –10 °C (14 °F)

Fresh clean soft water with anti-freeze

Engine oil

Refer to next page

• Above 25 °C (77 °F):

SAE30, SAE10W-30 or 15W-40

• −10 to 25 °C (14 to 77 °F):

SAE20, SAE10W-30 or 15W-40

•Below −10 °C (14 °F):

SAE10W-30

KUBOTA UDT or SUPER UDT fluid*

KUBOTA UDT or SUPER UDT fluid* or SAE 80-90 gear oil

Greasing

No. Place No. of greasing point Capacity Type of grease

Greasing 1

Brake pedal shaft 1

Clutch pedal shaft 2

Until grease overflows.

5. TIGHTENING TORQUES

[1] GENERAL USE SCREWS, BOLTS AND NUTS

Tighten screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual

according to the table below.

Indication on top of bolt

Indication on top of nut

Material of opponent part Ordinariness Aluminum Ordinariness Aluminum Ordinariness

Unit N·m kgf·m lbf·ft N·m kgf·m lbf·ft N·m kgf·m lbf·ft N·m kgf·m lbf·ft N·m kgf·m lbf·ft

7.9

0.80

M10

M12

M14

M16

M18

M20

9.3

108

125

191

246

284

334

392

0.95

1.8 to

2.1

4.0 to

4.6

6.4 to

7.4

11. 0 to

12.8

17.0 to

19.5

25.0 to

29.0

34.0 to

40.0

No-grade or 4T 7T 9T

No-grade or 4T

5.8

7.9

0.80

5.8

9.81

1.00

7.24

7.9

0.80

5.8

1.7 to

2.0

3.2 to

3.5

6.5

6.8

8.8

0.90

to 53–––

79.6 to

92.5

123

141

181

209

246

289

–––

11. 2

124

147

197

225

275

318

368

431

1.15

2.4 to

2.8

5.7

7.9 to

9.2

12.6 to

15.0

20.0 to

23.0

28.0 to

32.5

37.5 to

44.0

8.31

91.2 to

108

145

166

203

235

272

318

8.8

0.90

1.8

2.1

4.0

4.5

6.4

7.4

––

–––

12.3

6.5

14.2

103

117

167

–

196

260

304

344

402

491

568

WSM000001GEG0001US0

1.25 to

1.45

3.0 to

3.5

6.2 to

7.2

10.5 to

12.0

17.0 to

20.0

26.5 to

31.0

35.0 to

41.0

50.0 to

58.0

9.05 to

10.4

76.0 to

86.7

123

144

192

224

254

296

362

419

[2] STUD BOLTS

Material of opponent part Ordinariness Aluminum

Unit N·m kgf·m lbf·ft N·m kgf·m lbf·ft

1.2

8.7

M10

M12

M14

M16

M18

98.1 to

112

172

201

1.6

2.5 to

3.2

3.0 to

5.0

6.3 to

7.5

10.0 to

11. 5

17.5 to

20.5

8.9

to 3631 3.2 23

to 54–––

72.4 to

83.1

127

148

–––

0.90 to

1.2

2.0 to

2.6

6.5 to

8.6

WSM000001GEG0002US0

G-10

Page 30

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

[3] HYDRAULIC FITTINGS

(1) Hydraulic Hose Fittings

GENERAL

Hose size Thread side

02 1/8 13.8 to 15.6 1.40 to 1.60 10.2 to 11.5

1/4 22.6 to 27.4 2.30 to 2.80 16.7 to 20.2

3/8 45.2 to 52.9 4.60 to 5.40 33.3 to 39.0

(2) Hydraulic Pipe Cap Nuts

Pipe size

N·m kgf·m lbf·ft

ϕ4 × t1.0 19.7 to 29.4 2.00 to 3.00 14.5 to 21.6

ϕ6 × t1.0 24.6 to 34.3 2.50 to 3.50 18.1 to 25.3

ϕ8 × t1.0 29.5 to 39.2 3.00 to 4.00 21.7 to 28.9

ϕ10 × t1.0 39.3 to 49.0 4.00 to 5.00 29.0 to 36.1

ϕ12 × t1.5 49.1 to 68.6 5.00 to 7.00 36.2 to 50.6

ϕ15 × t1.6 108 to 117 11.0 to 12.0 79.6 to 86.7

ϕ18 × t1.6 108 to 117 11.0 to 12.0 79.6 to 86.7

Tightening torque

N·m kgf·m lbf·ft

WSM000001GEG0097US0

Tightening torque

(3) Adaptors, Elbows and Others

Item Thread side

G 1/8 45 to 53 4.5 to 5.5 33 to 39

G 1/4 74 to 83 7.5 to 8.5 55 to 61

Fitting with O-ring

G 3/8 93.2 to 102 9.50 to 10.5 68.8 to 75.9

G 1/2 113 to 122 11.5 to 12.5 83.2 to 90.4

G 1/8 23 to 26 2.3 to 2.7 17 to 19

G 1/4 36 to 43 3.6 to 4.4 26 to 31

Elbow with O-ring

G 3/8 54 to 63 5.5 to 6.5 40 to 47

G 1/2 73 to 83 7.4 to 8.5 54 to 61

G 1/8 9.8 to 14 1.0 to 1.5 7.3 to 10

G 1/4 30 to 34 3.0 to 3.5 22 to 25

Adapter

G 3/8 49 to 68 5.0 to 7.0 37 to 50

G 1/2 69 to 88 7.0 to 9.0 51 to 65

WSM000001GEG0098US0

Tightening torque

N·m kgf·m lbf·ft

WSM000001GEG0099US0

G-11

Page 31

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

[4] METRIC SCREWS, BOLTS AND NUTS

GENERAL

Grade

Unit N·m kgf·m lbf·ft N·m kgf·m lbf·ft

M8 24 to 27 2.4 to 2.8 18 to 20 30 to 34 3.0 to 3.5 22 to 25

M10 48 to 55 4.9 to 5.7 36 to 41 61 to 70 6.2 to 7.2 45 to 52

M12 78 to 90 7.9 to 9.2 58 to 66 103 to 117 10.5 to 12.0 76.0 to 86.7

M14 124 to 147 12.6 to 15.0 91.2 to 108 167 to 196 17.0 to 20.0 123 to 144

M16 197 to 225 20.0 to 23.0 145 to 166 260 to 304 26.5 to 31.0 192 to 224

Property class 8.8 Property class 10.9

WSM000001GEG0003US0

[5] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH

UNC OR UNF THREADS

Grade

Unit N·m kgf·m lbf·ft N·m kgf·m lbf·ft

1/4 11.7 to 15.7 1.20 to 1.60 8.63 to 11.5 16.3 to 19.7 1.67 to 2.00 12.0 to 14.6

5/16 23.1 to 27.7 2.36 to 2.82 17.0 to 20.5 33 to 39 3.4 to 3.9 25 to 28

3/8 48 to 56 4.9 to 5.7 36 to 41 61 to 73 6.3 to 7.4 45 to 53

1/2 110 to 130 11.3 to 13.2 81.2 to 95.8 150 to 178 15.3 to 18.1 111 to 131

9/16 150 to 178 15.3 to 18.1 111 to 131 217 to 260 22.2 to 26.5 160 to 191

5/8 204 to 244 20.8 to 24.8 151 to 179 299 to 357 30.5 to 36.4 221 to 263

SAE GR.5 SAE GR.8

WSM000001GEG0008US0

[6] PLUGS

Material of opponent part

Shape Size

N·m kgf·m lbf·ft N·m kgf·m lbf·ft

Tapered screw

Straight screw G1/4 25 to 34 2.5 to 3.5 18 to 25 – – –

R1/8 13 to 21 1.3 to 2.2 9.4 to 15 13 to 19 1.3 to 2.0 9.4 to 14

R1/4 25 to 44 2.5 to 4.5 18 to 32 25 to 34 2.5 to 3.5 18 to 25

R3/8 49 to 88 5.0 to 9.0 37 to 65 49 to 58 5.0 to 6.0 37 to 43

R1/2 58.9 to 107 6.00 to 11.0 43.4 to 79.5 59 to 78 6.0 to 8.0 44 to 57

G3/8 62 to 82 6.3 to 8.4 46 to 60 – – –

G1/2 49 to 88 5.0 to 9.0 37 to 65 – – –

Ordinariness Aluminum

WSM000001GEG0005US0

G-12

Page 32

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

6. MAINTENANCE CHECK LIST

GENERAL

Service Interval

No. Item

1 Greasing – 

2 Engine start system Check 

3 Wheel bolt torque Check 

4Brake Adjust 

5 Fan belt Adjust 

6 Clutch Adjust 

7 Battery condition Check 

Clean 

8 Air cleaner element [Single type]

Replace

Primary

Air cleaner element

[Double type]

10 Fuel filter element

11 Parking brake Adjust 

12 Fuel line

Engine oil Chang

14 Engine oil filter Replace   

15 Transmission oil filter Replace   

16 Toe-in Adjust 

17 Radiator hose and clamp

18 Power steering oil line

19 HST oil line

20 Hydraulic oil filter Replace 

21 Transmission fluid Change 

22 Front axle case oil Change 

element

Secondary element

Clean 

Replace

Clean 

Replace 

Check 

Replace

Check 

Replace

Check 

Replace

Check 

Replace

50 100 150 200 250 300 350 400 450 500 550 600 650 700

e   

After since

every 50 Hr

every

100 Hr

every

100 Hr

every

100 Hr

every

100 Hr

every

100 Hr

every

1 year

every

100 Hr

every

1 year

every

1 year

every

100 Hr

every

400 Hr

every

100 Hr

every

100 Hr

every

2 years

every

200 Hr

every

200 Hr

every

200 Hr

every

200 Hr

every

200 Hr

every

2 years

every

200 Hr

every

2 years

every

200 Hr

every

2 years

every

400 Hr

every

400 Hr

every

400 Hr

Refer-

ence

porta

page

G-20

G-21

G-23

G-27

G-26

G-24

G-28 *3

G-24 *1

G-33

G-24 *1

G-33 *2

G-33

G-25

G-33

G-27

G-26

G-34

G-30

G-31

G-30

G-34

G-30

G-34

G-30

G-34

G-19

G-33

im-

G-13

Page 33

STW34, STW37, STW40, WSM

IMPORTANT

KiSC issued 11, 2014 A

GENERAL

No. Item

23 Front axle pivot Adjust 

24 Engine valve clearance Adjust

25 Cooling system Flush

26 Coolant Change

27 Fuel system Bleed

28 Clutch housing water Drain G-37

29 Fuse Replace G-38

30 Light bulb Replace G-39

50 100 150 200 250 300 350 400 450 500 550 600 650 700

Service Interval

600 Hr

800 Hr

2 years

Service

quired

After

since

every

as re-

Refer-

ence page

G-33

G-35

G-37

im-

porta

(Only the Check Points for Tractors with CAB)

Service Interval

No. Item Daily

Clogging of air conditioner

condenser screen

2 Tension of air conditioner drive belt Adjust 

3 Clogging of inner air filter Clean 

4 Clogging of fresh air filter Clean 

Clogging of air conditioner

condenser

6 Air conditioner pipes and hoses

7 CAB isolation cushion Check

8 Washer liquid Check service

9 Amount of refrigerant (gas) Check G-40

Clean  G-16

Check 

Check

Replace

50 100 150 200 250 300 350 400

since

200 Hr

1 year

2 years

1 year

as required

After

every

Refer-

ence page

G-31

G-32

G-33

G-34

G-40

• The jobs indicated by must be done after the first 50 hours of operation.

• *1 Air cleaner should be cleaned more often in dusty conditions than in normal conditions.

• *2 Every year or every 6 times of cleaning.

• *3 When the battery is used for less than 100 hours per year, check the battery condition by reading the indicator annually.

9Y1211109GEG0004US0

G-14

Page 34

STW34, STW37, STW40, WSM

CAUTION

WARNING

KiSC issued 11, 2014 A

GENERAL

7. CHECK AND MAINTENANCE

• Be sure to check and service the tractor on a flat place with engine shut off, the parking brake on and chock the wheels.

9Y1211109GEG0005US0

[1] DAILY CHECK

To prevent trouble from occurring, it is important to know the condition of the tractor well. Check it before starting.

To avoid personal injury or death:

• Take the following precautions when checking the tractor.

• Park the machine on firm and level ground.

• Set the parking brake.

• Lower the implement to the ground.

• All residual pressure of the hydraulic system released.

• Stop the engine and remove the key.

9Y1211109GEG0006US0

Checking

1. Check the tire pressure, and check for wear and damage.

2. Check for oil and water leaks.

3. Check the engine oil level.

4. Check the transmission fluid level.

5. Check the coolant level.

6. Check the condition of seat belt and ROPS attaching hardware.

7. Check and clean the radiator screen and grill.

8. Check the screws and nuts of tires are tight.

9. Check the number plate.

10. Care of danger, warning and caution labels.

11. Clean around the exhaust manifold and the muffler of the engine.

12. Check air cleaner evacuator valve (When used in a dusty place)

13. Check brake and clutch pedal

14. Check indicators, gauges and meter

15. Check lights

16. Check seat belt and ROPS

17. Check movable parts

18. Check the fuel level.

• While sitting in the operator's seat.

1. Check the HST pedal, brake pedals and clutch pedal.

2. Check the parking brake.

3. Check the steering wheel.

• Turning the key switch.

1. Check the performance of the Easy Checker™ lights.

2. Check head lights, turn signal lights, hazard lights and other light equipment. Clean if necessary.

3. Check the performance of the meters and gauges.

• Starting the engine.

1. Check to see that the lights on the Easy Checker™ go off.

2. Check the color of the exhaust gas.

3. Check the brakes for proper operation.

9Y1211109GEG0007US0

G-15

Page 35

STW34, STW37, STW40, WSM

WARNING

IMPORTANT

WARNING

IMPORTANT

KiSC issued 11, 2014 A

Cleaning Air Conditioner Condenser Screen [CAB Model]

To avoid personal injury or death:

• Be sure to stop the engine before removing the screen.

• The condenser and receiver become hot while the air conditioner is running. Before checking or cleaning them, wait enough until they cool down.

1. Detach the air conditioner condenser screen and remove all foreign materials.

• Grill and screen must be clean from debris to prevent engine from overheating and to allow good air intake for air cleaner.

(1) Air Conditioner Condenser Screen

[2] CHECK POINTS OF INITIAL 50 HOURS

Changing Engine Oil

To avoid personal injury or death:

• Be sure to stop the engine before changing the oil.

• Allow engine to cool down sufficiently, oil can be hot and can burn.

1. To drain the used oil, remove the drain plug at the bottom of the engine and drain the oil completely into the oil pan. All the used oil can be drained out easily when the engine is still warm.

2. After draining, reinstall the drain plug.

3. Fill with the new oil up to the upper notch on the dipstick. (Refer to "4. LUBRICANTS, FUEL AND COOLANT" on page G-8.)

GENERAL

9Y1211109GEG0074US0

• When using an oil of different maker or viscosity from the previous one, remove all of the old oil.

• Never mix two different types of oil.

• If oil level is low, do not run engine.

5.7 L

6.0 U.S.qts

5.0 Imp.qts

6.7 L

7.1 U.S.qts

5.9 Imp.qts

range.

9Y1211109GEG0008US0

Engine oil Capacity

(1) Drain Plug (2) Dipstick (3) Oil Inlet

STW34

STW37, STW40

A: Oil level is acceptable within this

G-16

Page 36

STW34, STW37, STW40, WSM

WARNING

IMPORTANT

CAUTION

IMPORTANT

KiSC issued 11, 2014 A

GENERAL

Replacing Engine Oil Filter Cartridge

To avoid personal injury or death:

• Be sure to stop the engine before changing the oil filter cartridge.

• Allow engine to cool down sufficiently, oil can be hot and can burn.

1. Remove the oil filter.

2. Put a film of clean engine oil on the rubber seal of the new filter.

3. Tighten the filter quickly until it contacts the mounting surface. Tighten filter by hand an additional 1/2 turn only.

4. After the new filter has been replaced, the engine oil normally decreases a little. Make sure that the engine oil does not leak through the seal and be sure to check the oil level on the dipstick. Then, replenish the engine oil up to the prescribed level.

• To prevent serious damage to the engine, use only a KUBOTA genuine filter.

(1) Engine Oil Filter

9Y1211109GEG0009US0

Checking Clutch Pedal Free Travel

• When checking, park the tractor on flat ground, apply the parking brake, stop the engine and remove the key.

1. Stop the engine and remove the key.

2. Slightly depress the clutch pedal and measure free travel at the top of pedal stroke.

3. If adjustment is needed, loosen the lock nut and turn the turnbuckle to adjust the rod length within acceptable limits.

4. Retighten the lock nut.

• After adjustment, be sure to check that engine does not start without depressing the clutch pedal but engine start when depressing the clutch pedal.

Clutch pedal free travel

"L"

(1) Clutch Pedal (2) Lock Nut (3) Turnbuckle

Factory specification

L: Free Travel

20.0 to 30.0 mm

0.78 to 1.18 in.

9Y1211109GEG0010US0

G-17

Page 37

STW34, STW37, STW40, WSM

WARNING

IMPORTANT

KiSC issued 11, 2014 A

GENERAL

Replacing Transmission Oil Filter

To avoid personal injury or death:

• Be sure to stop the engine before changing the oil filter cartridge.

• Allow engine to cool down sufficiently, oil can be hot and can burn.

1. Remove the drain plugs at the bottom of the transmission case and drain the oil completely into the oil pan.

2. After draining reinstall the drain plugs.

3. Remove the oil filter.

4. Put a film of clean transmission oil on the rubber seal of the new filter.

5. Quickly tighten the filter until it contacts the mounting surface, then, with a filter wrench, tighten it an additional 1 turn only.

6. After the new filter has been replaced, fill the transmission oil up to the upper notch on the dipstick.

7. After running the engine for a few minutes, stop the engine and check the oil level again, add oil to the prescribed level.

8. Make sure that the transmission fluid doesn't leak past the seal on the filter.

• To prevent serious damage to the hydraulic system, use only a KUBOTA genuine filter.

• Do not operate the tractor immediately after changing the transmission fluid. Run the engine at medium speed for a few minutes to prevent damage to the transmission.

(1) Drain Plugs (2) Transmission Oil Filter (3) Dipstick (4) Oil inlet

(A) Oil level is acceptable within this

range.

9Y1211109GEG0075US0

G-18

Page 38

STW34, STW37, STW40, WSM

WARNING

KiSC issued 11, 2014 A

GENERAL

Changing Transmission Fluid / Replacing Hydraulic Oil Filter

 Cleaning Magnetic Filter

To avoid personal injury or death:

• Be sure to stop the engine before changing the oil filter cartridge.

• Allow engine to cool down sufficiently, oil can be hot and can burn.

1. Remove the drain plugs at the bottom of the transmission case and drain the oil completely into the oil pan.

2. After draining reinstall the drain plugs.

3. Remove the oil filter.

4. Wipe off metal filings from the magnetic filter with a clean rag.

5. Put a film of clean transmission oil on the rubber seal of the new filter.

6. Quickly tighten the filter until it contacts the mounting surface, then tighten it by hand an additional 1/2 turn only.

7. Fill with the new KUBOTA SUPER UDT fluid up to the upper notch on the dipstick. (Refer to "4. LUBRICANTS, FUEL AND COOLANT" on page G-8.)

8. After running the engine for a few minutes, stop the engine and check the oil level again, add oil to the prescribed level.

9. Make sure that the transmission fluid doesn't leak past the seal on the filter.

24 L

Transmission oil Capacity

6.3 U.S.gals

5.3 Imp.gals

(1) Drain Plugs (2) Hydraulic Oil Filter (3) Magnetic Filter

(Wipe Off Metal Filings)

(4) Dipstick (5) Oil Inlet

(A) Oil level is acceptable within this

range.

9Y1211109GEG0030US0

G-19

Page 39

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

[3] CHECK POINTS OF EVERY 50 HOURS

Greasing

1. Apply a grease to the following position as figures.

(1) Grease Fitting (Top Link) (2) Grease Fitting (Lifting Rod RH) (3) Battery Terminal

GENERAL

(4) Grease Fitting (Brake Pedal Shaft) (5) Grease Fitting (Clutch Pedal Shaft) (6) Cruise Control Lever Guide

9Y1211109GEG0011US0

G-20

Page 40

STW34, STW37, STW40, WSM

WARNING

KiSC issued 11, 2014 A

GENERAL

Checking Engine Start System

To avoid personal injury or death:

• Do not allow anyone near the tractor while testing.

• If the tractor does not pass the test do not operate the tractor.

 Preparation before testing

1. Place all control levers in the "NEUTRAL" position.

2. Set the parking brake and stop the engine.

 Test: Switch for the speed control pedal.

1. Sit on the operator's seat.

2. Depress the speed control pedal to the desired direction.

3. Depress the clutch pedal fully.

4. Disengage the PTO clutch control switch, and disengage the rear and mid-PTO gear shift levers.

5. Turn the key to "START" position.

6. The engine must not crank.

 Test: Switch for the mid-PTO gear shift lever.

1. Sit on the operator's seat.

2. Disengage the rear PTO gear shift lever, and engage the mid-PTO gear shift lever.

3. Depress the clutch pedal fully.

4. Place the speed control pedal in "NEUTRAL" position.

5. Turn the key to "START" position.

6. The engine must not crank.

 Test: Switch for the clutch pedal.

1. Sit on the operator's seat.

2. Disengage the PTO clutch control switch, and disengage the rear and mid-PTO gear shift levers.

3. Place the speed control pedal in "NEUTRAL" position.

4. Release the clutch pedal.

5. Turn the key to "START" position.

6. The engine must not crank.

(1) Speed Control Pedal (2) Clutch Pedal

(3) PTO Clutch Control Switch (4) Rear PTO Gear Shift Lever

9Y1211109GEG0012US0

G-21

Page 41

STW34, STW37, STW40, WSM

WARNING

KiSC issued 11, 2014 A

GENERAL

Checking Operator Presence Control

To avoid personal injury or death:

• Do not allow anyone near the tractor while testing.

• If the tractor does not pass the test, do not operate the tractor.

 Test: Switch for the operator's seat.

1. Sit on the operator's seat.

2. Start the engine.

3. Engage the mid-PTO gear shift lever.

4. Stand up. (Do not get off the machine.)

 Test: Switch for the operator's seat.

1. Sit on the operator's seat.

2. Start the engine.

3. Engage the mid-PTO gear shift lever.

4. Stand up. (Do not get off the machine.)

5. The engine must shut off after approximately 1 second.

 Test: Switch for the parking brake lever.

1. Sit on the operator's seat.

2. Start the engine.

3. Engage the rear PTO gear shift lever, and disengage the mid-PTO gear shift lever.

4. Release the parking brake.

5. Stand up. (Do not get off the machine.)

6. The engine must shut off after approximately 1 second.

 Test: Switch for the operator's seat

1. Sit on the operator's seat.

2. Start engine.

3. Engage the mid-PTO gear shift lever.

4. Stand up. (Do not get off the machine.)

5. The engine must shut off after approximately 1 second.

 Test: Switch for the parking brake lever

1. Sit on the operator's seat.

2. Start engine.

3. Engage the rear PTO gear shift lever, and disengage the mid-PTO gear shift lever.

4. Release the parking brake.

5. Stand up. (Do not get off the machine.)

6. The engine must shut off after approximately 1 second.

(1) Speed Control Pedal (2) Clutch Pedal (3) PTO Clutch Control Switch

(4) Rear PTO Gear Shift Lever (5) Parking Brake Lever (6) Mid-PTO Gear Shift Lever

9Y1211109GEG0013US0

G-22

Page 42

STW34, STW37, STW40, WSM

WARNING

KiSC issued 11, 2014 A

GENERAL

Checking Wheel Bolt Torque

To avoid personal injury or death:

• Never operate tractor with a loose rim, wheel, or axle.

• Any time bolts and nuts are loosened, retighten to specified torque.

• Check all bolts and nuts frequently and keep them tight.

1. Check the wheel mounting screws and nuts regularly especially when new. If there are loosened, tighten as follows.

Front wheel mounting screw and nut

Tightening torque

Rear wheel mounting screw and nut

85 N·m

9.0 kgf·m

65.1 lbf·ft

215 N·m

22.0 kgf·m

159.1 lbf·ft

(1) Front Wheel Mounting Screw and

Nut

(2) Rear Wheel Mounting Screw and

Nut

9Y1211109GEG0014US0

G-23

Page 43

STW34, STW37, STW40, WSM

NOTE

IMPORTANT

NOTE

KiSC issued 11, 2014 A

[4] CHECK POINTS OF EVERY 100 HOURS

Checking Clutch Pedal Free Travel

• See page G-17.

Cleaning Air Cleaner Element

[Single Element]

1. Remove the element.

2. Clean the element: (1) When dry dust adheres to the element, blow compressed air

from the inside, turning the element. Pressure of compressed air must be under 205 kPa (2.1 kgf/cm 30 psi).

(2) When carbon or oil adheres to the element, soak the

element in detergent for 15 minutes then wash it several times in water, rinse with clean water and dry it naturally. After element is fully dried, inspect inside of the element with a light and check if it is damaged or not. (referring to the instructions on the label attached to the case.)

3. Replace air cleaner element: Once yearly or after every sixth cleaning, whichever comes first.

GENERAL

9Y1211109GEG0015US0

• Check to see if the evacuator valve is blocked with dust.

• The air cleaner uses a dry element, never apply oil.

• Do not run the engine with filter element removed.

• Be sure to refit the cover with the arrow mark (on the rear) upright. If the cover is improperly fitted, dust passed by the baffle and directly adheres to the element.

 Evacuator Valves

Open the evacuator valve once a week under ordinary

conditions - or daily when used in a dusty place - to get rid of large particles of dust and dirt.

[Double Element Type]

1. Remove the air cleaner cover and primary element.

2. Clean the primary element: (1) When dry dust adheres to the element, blow compressed air

from the inside, turning the element. Pressure of compressed air must be under 205 kPa (2.1 kgf/cm 30 psi).

(2) When carbon or oil adheres to the element, soak the

3. Replace air cleaner primary element: Once yearly or after every sixth cleaning, whichever comes first.

• Check to see if the evacuator valve is blocked with dust.

(1) Element (2) Cover (3) Evacuator Valve (4) Primary Element

(5) Secondary (Safety) Element

[A] Single Element Type [B] Double Element Type

(To be continued)

G-24

Page 44

STW34, STW37, STW40, WSM

IMPORTANT

KiSC issued 11, 2014 A

(Continued)

GENERAL

• The air cleaner uses a dry element, never apply oil.

• Do not run the engine with filter element removed.

• Be sure to refit the cover with the arrow mark (on the rear of cover) upright. If the cover is improperly fitted, evacuator valve will not function and dust will adhere to the element.

• Do not touch the secondary element except in cases where replacing is required.

 Evacuator Valves

Open the evacuator valve once a week under ordinary

conditions - or daily when used in a dusty place - to get rid of large particles of dust and dirt.

9Y1211109GEG0016US0

Cleaning Fuel Filter

This job should not be done in the field, but in a clean place.

1. Close the fuel valve.

2. Unscrew the screw ring and remove the filter bowl, and rinse the inside with kerosene.

3. Take out the element and dip it in the kerosene to rinse.

4. After cleaning, reassemble the fuel filter, keeping out dust and dirt.

5. Bleed the fuel system. (See page G-37.)

• If dust and dirt enters the fuel system the fuel pump and injection nozzles are subject to premature wear. To prevent this, be sure to clean the fuel filter bowl periodically.

(1) Fuel Valve (2) Fuel Filter Bowl (3) O-ring (4) Filter Element

(5) Screw Ring (6) Spring

A: Close

9Y1211109GEG0017US0

G-25

Page 45

STW34, STW37, STW40, WSM

CAUTION

IMPORTANT

CAUTION

KiSC issued 11, 2014 A

GENERAL

Checking Fuel Line

• Stop the engine when attempting the check and change prescribed below.

• Remember to check the fuel line periodically. The fuel line is subject to wear and aging, fuel may leak out onto the running engine, causing a fire.

1. Check to see that all line and hose clamps are tight and not damaged.

2. If hoses and clamps are found worn or damaged, replace or repair them at once.

3. The fuel line is made of rubber and ages regardless of period of service. Replace the fuel pipe together with the clamp every two years and securely tighten.

4. However if the fuel pipe and clamp are found damaged or deteriorated earlier than two years, then change or remedy.

5. After the fuel line and clamp have been changed, bleed the fuel system. (See page G-37.)

• When the fuel line is disconnected for change, close both ends of the fuel line with a piece of clean cloth or paper to prevent dust and dirt from entering. Entrance of dust and dirt causes malfunction of the fuel injection pump. In addition, particular care must be taken not to admit dust and dirt into the fuel pump.

(1)Fuel Hose (2)Clamp

9Y1211109GEG0018US0

Checking Fan Belt Tension

• Be sure to stop engine before checking belt tension.

1. Stop the engine and remove the key.

2. Apply moderate thumb pressure to belt between pulleys.

3. If tension is incorrect, loosen the alternator mounting bolts and using a lever placed between the alternator and the engine block, pull the alternator out until the deflection of the belt falls within acceptable limits.

4. Replace fan belt if it is damaged.

A deflection of between

Fan Belt tension Factory specification

(1) Adjusting Screw (2) Fan Belt

A: Check the belt tension B: To tighten

10 to 12 mm (0.40 to 0.47in.) when the belt is pressed in the middle of the span.

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G-26

Page 46

STW34, STW37, STW40, WSM

WARNING

CAUTION

IMPORTANT

NOTE

KiSC issued 11, 2014 A

GENERAL

Adjusting Brake Pedal Free Travel

To avoid personal injury or death:

• Stop the engine and chock the wheels before checking brake pedal.

1. Release the parking brake.

2. Slightly depress the brake pedals and measure free travel at top of pedal stroke.

3. If adjustment is needed, loosen the lock nut and turn the brake rod to adjust the rod length within acceptable limits.

4. Retighten the lock nut.

Brake pedal free travel

"L"

Factory specification

20 to 30 mm

0.79 to 1.18 in.

(1) Brake Pedal (2) Lock Nut (3) Brake Rod (4) Length of Brake Rod

L: Free Travel

9Y1211109GEG0020US0

Adjusting Parking Brake Lever

• Be sure to stop engine before checking parking brake.

1. Slowly raise the parking brake lever (1) to the ratchet sound made by the parking brake lever.

2. If the No. of notch is not within the factory specifications, loosen the lock nut (2) and turn the brake rod to adjust within acceptable limits.

3. Retighten the lock nut (2) securely.

Parking brake lever free travel

2 notches (Ratchet sound 2)

• Check the brake pedal free travel after adjusting the parking brake.

• Refer to "BRAKE" section for detailed method.

(1) Parking Brake Lever (2) Lock Nut (3) Parking brake rod

A: Pull

9Y1211109GEG0021US0

G-27

Page 47

STW34, STW37, STW40, WSM

DANGER

WARNING

KiSC issued 11, 2014 A

GENERAL

Checking Battery Condition

To avoid the possibility of battery explosion: For the refillable type battery, follow the instructions below.

• 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.

To avoid personal injury or death:

• Never remove the battery cap while the engine is running.

• Keep electrolyte away from eyes, hands and clothes. If you are spattered with it, wash it away completely with water immediately and get medical attention.

• Keep open sparks and flames away from the battery at all times. Hydrogen gas mixed with oxygen becomes very explosive.

• Wear eye protection and rubber gloves when working around battery.

The factory-installed battery is of non-refillable type. If the indicator turns white, do not charge the battery but replace it with new one.

Mishandling the battery shortens the service life and adds to

maintenance costs. The original battery is maintenance free, but needs some servicing.

If the battery is weak, the engine will be difficult to start and the

lights will be dim. It is important to check the battery periodically.

State of indicator display

Green

Black Needs charging battery.

White Needs changing battery.

(1) Battery (2) Indicator

Specific gravity of electrolyte and quality of electrolyte are both in good condition.

9Y1211109GEG0022US0

G-28

Page 48

STW34, STW37, STW40, WSM

WARNING

KiSC issued 11, 2014 A

GENERAL

Battery Charging

To avoid personal injury or death:

• When the battery is being activated, hydrogen and oxygen gases in the battery are extremely explosive. Keep open sparks and flames away from the battery at all times, especially when charging the battery.

• When charging the battery, ensure the vent caps are securely in place. (if equipped)

• When disconnecting the cable from the battery, start with the negative terminal first. When connecting the cable to the battery, start with the positive terminal first.

• Never check battery charge by placing a metal object across the posts. Use a voltmeter or hydrometer.

1. To slow charge the battery, connect the battery positive terminal to the charger positive terminal and the negative to the negative, then recharge in the standard fashion.

2. A boost charge is only for emergencies. It will partially charge the battery at a high rate and in a short time. When using a boost-charged battery, it is necessary to recharge the battery as early as possible. Failure to do this will shorten the battery's service life.

3. The battery is charged if the indicator display turns green from black.

4. When exchanging an old battery for a new one, use battery of equal specification shown in Table 1.

Table 1

Battery

TYPE

75D26R 12 123 490 6.5

volts

Reserve

Capacity

(min)

CCA (SAE)

(A)

Normal

Charging

Rate (A)

 Direction for Storage

1. When storing the tractor for long periods of time, remove the battery from tractor, adjust the electrolyte to the proper level and store in a dry place out of direct sunlight.

2. The battery self-discharges while it is stored. Recharge it once every three months in hot seasons and once every six months in cold seasons.

(1) Battery

9Y1211109GEG0023US0

G-29

Page 49

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

[5] CHECK POINTS OF EVERY 200 HOURS

Changing Engine Oil

• See page G-16.

Changing Engine Oil Filter

• See page G-17.

Changing Transmission Oil Filter

• See page G-18.

Checking Radiator Hose and Hose Clamp

Check to see if radiator hoses are properly fixed every

200 hours of operation or six months, whichever comes first.

1. If hose clamps (2) are loose or water leaks, tighten hose clamps (2) securely.

2. Replace hoses (1) and tighten hose clamps (2) securely, if radiator hoses (1) are swollen, hardened or cracked. Replace hoses and hose clamps every 2 years or earlier if checked and found that hoses are swollen, hardened or cracked.

 Precaution at Overheating

Take the following actions in the event the coolant temperature

be nearly or more than the boiling point, what is called "Overheating".

1. Stop the machine operation in a safe place and keep the engine unloaded idling.

2. Do not stop the engine suddenly, but stop it after about 5 minutes of unloaded idling.

3. Keep yourself well away from the machine for further 10 minutes or while the steam blown out.

4. Checking that there gets no danger such as burn, get rid of the causes of overheating according to the manual, see "TROUBLESHOOTING" section, and then start again the engine.

(1) Radiator Hose (2) Clamp

Checking HST Oil Line and Power Steering Hose

1. Check to see that all lines (1), (2) and hose clamps are tight and not damaged.

2. If hoses and clamps are found worn or damaged, replace or repair them at once.

(1) HST Oil Line (2) Power Steering Hose

GENERAL

9Y1211109GEG0024US0

9Y1211109GEG0077US0

9Y1211109GEG0078US0

9Y1211109GEG0025US0

9Y1211109GEG0026US0

G-30

Page 50

STW34, STW37, STW40, WSM

IMPORTANT

WARNING

KiSC issued 11, 2014 A

GENERAL

Adjusting Toe-in

1. Park the tractor on the flat place.

2. Inflate the tires to the specified pressure.

3. Turn steering wheel so front wheels are in the straight ahead position.

4. Lower the implement, lock the parking brake and stop the engine.

5. Measure distance between tire beads at front of tire, hub height.

6. Measure distance between tire beads at rear of tire, hub height.

7. Front distance should be 2 to 8 mm (0.079 to 0.315 in.) less than rear distance.

8. If the measurement is not within the factory specifications, adjust by changing the tie-rod length.

Toe-in ((B) - (A)) Factory specification

2 to 8 mm

0.079 to 0.315 in.

 Adjusting

1. Detach the snap ring (1) from the dust cover.

2. Loosen the tie-rod lock nut (2) and turn the tie-rod joint (3) to adjust the tie-rod length until the proper toe-in measurement is obtained.

3. Retighten the tie-rod lock nut (2).

4. Attach the snap ring (1) to the dust cover.

117 to 137 N·m

Tightening torque Tie-rod lock nut

12.0 to 14.0 Kgf·m

86.1 to 101.3 lbf·ft

• A right and left tie-rod joint is adjusted to the same length.

(1) Snap Ring (2) Tie-rod Lock Nut (3) Tie-rod Lock Joint

(A) Wheel to Wheel Distance at Front (B) Wheel to Wheel Distance at Rear (C) Front

9Y1211109GEG0027US0

Adjusting Air-Conditioner Belt Tension [CAB Model]

To avoid personal injury or death:

• Be sure to stop the engine before checking belt tension.

Proper air conditioner belt tension

A deflection of between 14 to 16 mm (0.56 to

0.62 in.) when the belt is pressed (98 N [10 kgf]) in the middle of the span.

1. Stop the engine and remove the key.

2. Apply moderate thumb pressure to belt between pulleys.

3. If tension is incorrect, loosen the lock nut and turn the adjusting bolt to adjust the belt tension within acceptable limits.

4. Replace air-conditioner belt if it is damaged.

(1) Adjusting Bolt (2) Lock Nut

A: Check the Belt Tension

9Y1211109GEG0079US0

G-31

Page 51

STW34, STW37, STW40, WSM

NOTE

IMPORTANT

NOTE

IMPORTANT

KiSC issued 11, 2014 A

GENERAL

Cleaning Inner Air Filter [CAB Model]

Remove the inner filter, and blow air from the direction opposite

to the filter's normal air flow.

Pressure of compressed air must be under 205 kPa

(2.1 kgf/cm

(1) Inner Air Filter (2) Screw

, 30 psi).

9Y1211109GEG0080US0

Cleaning Fresh Air Filter [CAB Model]

Remove the knob bolts and pull out filter.

• Attach the filter and cover as the illustration above.

 Cleaning the air filter

•Normal use Blow air from the opposite direction to the filter's normal air flow. Pressure of compressed air must be under 205 kPa (2.1 kgf/cm

, 30 psi).

• Do not hit the filter. If the filter becomes deformed, dust may enter into the air-conditioner, which may cause damage and malfunction.

• If the filter is very dirty: Dip the filter in lukewarm water with mild dish washing detergent. Move it up and down as well as left and right to loosen dirt. Rinse the filter with clean water and let it air-dry.

• Do not use gasoline, thinner or similar chemicals to clean the filter as damage to the filter may occur.

• It may also cause an unpleasant odor in the CAB when the system is used next.

(1) Fresh Air Filter (2) Cover (3) Knob Bolt

(A) Air Inlet Port (B) "AIR CONDITIONER AIRFLOW"

9Y1211109GEG0081US0

Checking Air Conditioner Condenser [CAB Model]

Check air conditioner condenser to be sure it is clean ofdebris.

(1) Air Conditioner Condenser

9Y1211109GEG0082US0

G-32

Page 52

STW34, STW37, STW40, WSM

NOTE

KiSC issued 11, 2014 A

[6] CHECK POINTS OF EVERY 400 HOURS

Replacing Hydraulic Oil Filter Cartridge

• See page G-19.

Replacing Fuel Filter Element

• See page G-25.

Changing Transmission Fluid / Replacing hydraulic Oil Filter

• See page G-18.

Changing Front Axle Case Oil

1. To drain the used oil, remove the right and left drain plugs and filling plug at the front axle case and drain the oil completely into the oil pan.

2. After draining reinstall the drain plugs.

3. Fill with the new oil. (Refer to "4. LUBRICANTS, FUEL AND COOLANT" on page G-8.)

4. After filling reinstall the filling plug.

• Make sure the oil level is at the center of the front axle.

Front axle case oil Capacity

GENERAL

9Y1211109GEG0028US0

9Y1211109GEG0029US0

9Y1211109GEG0083US0

4.5 L

4.8 U.S.qts

4.0 Imp.qts

(1) Filling plug (2) Drain plug

[7] CHECK POINT OF EVERY 600 HOURS

Adjusting Front Axle Pivot

If the front axle pivot pin adjustment is not correct, front wheel

vibration can occur causing vibration in the steering wheel.

 Adjusting procedure

Loosen the lock nut, screw-in the adjusting screw until seated,

then tighten the screw with an additional 1/6 turn.

Re-tighten the lock nut.

(1) Adjusting Screw (2) Lock Nut

[8] CHECK POINT OF EVERY 800 HOURS

Checking Valve Clearance

• See page 1-S14.

[9] CHECK POINTS OF EVERY 1 YEAR

Replacing Air Cleaner Element (Primary) and Secondary Element

• See page G-24.

Checking Air Conditioner Pipes and Hoses [CAB Model]

• See page G-32.

(A) Oil level

9Y1211109GEG0031US0

9Y1211109GEG0032US0

9Y1211109GEG0033US0

9Y1211109GEG0034US0

9Y1211109GEG0084US0

G-33

Page 53

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

Checking CAB Isolation Cushion [CAB Model]

1. Check the cushion for any breakage or fatigue. Replace them if they are deteriorated.

[10] CHECK POINTS OF EVERY 2 YEARS

Replacing Radiator Hose (Water Pipes)

1. Replace the hoses and clamps. Refer to "Checking Radiator Hose and Hose Clamp". (See page G-30.)

Replacing Fuel Hose

1. Replace the fuel hoses and clamps, if necessary. Refer to "Checking Fuel Line". (See page G-26.)

Replacing Power Steering Hoses

1. Replace the hoses and clamps. Refer to "Checking HST Oil Line and Power Steering Hose". (See page G-30.)

Replacing HST Oil Line

1. Replace the hoses and clamps. Refer to "Checking HST Oil Line and Power Steering Hose". (See page G-30.)

Replacing Air Conditioner Pipes and Hoses [CAB Model]

• See page 10-S49, 10-S51.

GENERAL

9Y1211109GEG0076US0

9Y1211109GEG0035US0

9Y1211109GEG0036US0

9Y1211109GEG0037US0

9Y1211109GEG0038US0

9Y1211109GEG0085US0

G-34

Page 54

STW34, STW37, STW40, WSM

WARNING

IMPORTANT

NOTE

KiSC issued 11, 2014 A

GENERAL

Flush Cooling System and Changing Coolant

To avoid personal injury or death:

• Do not remove radiator cap while coolant is hot. When cool, slowly rotate cap to the first stop and allow sufficient time for excess pressure to escape before removing the cap completely.

1. Stop the engine, remove the key and let it cool down.

2. To drain the coolant, open the radiator drain plug and remove radiator cap. The radiator cap must be removed to completely drain the coolant.

3. After all coolant is drained, reinstall the drain plug.

4. Fill with clean soft water and cooling system cleaner.

5. Follow directions of the cleaner instruction.

6. After flushing, fill with clean soft water and anti-freeze until the coolant level is just below the radiator cap. Install the radiator cap securely.

7. Fill with coolant up to the "FULL" mark of recovery tank.

8. Start and operate the engine for few minutes.

9. Stop the engine, remove the key and let cool.

10. Check coolant level of recovery tank and add coolant if necessary.

11. Properly dispose of used coolant.

• Do not start engine without coolant.

• Use clean, fresh soft water and anti-freeze to fill the radiator and recovery tank.

• When mixing the anti-freeze with water, the anti-freeze mixing ratio is 50 %.

• Securely tighten radiator cap. If the cap is loose or improperly fitted, water may leak out and the engine could overheat.

• On cab type machines, coolant circulates through the heater. This means that one more liter or so of coolant is required. In changing coolant, pour coolant up to the filler port of the recovery tank. Turn ON the heater (shift the temperature control dial toward WARM), and run the engine for a while in order to warm coolant. Then stop the engine. When coolant has cooled down, some of the coolant in the recovery tank is sucked. Now the recovery tank is appropriately filled with coolant.

6.6 L

Coolant (with recovery tank)

ROPS

Capacity

CABIN

7.0 U.S.qts

5.8 Imp.qts

7.1 L

7.5 U.S.qts

6.2 Imp.qts

(1) Radiator Cap (2) Recovery Tank (3) Drain Plug

G-35

A: FULL B: LOW

(To be continued)

Page 55

STW34, STW37, STW40, WSM

WARNING

KiSC issued 11, 2014 A

(Continued)

GENERAL

 Anti-Freeze

To avoid personal injury or death:

• When using antifreeze, put on some protection such as rubber gloves (Antifreeze contains poison.).

• If it is swallowed, seek immediate medical help. Do NOT make a person throw up unless told to do so by poison control or a health care professional. Use standard first aid and CPR for signs of shock or cardiac arrest. Call your local Poison Control Center or your local emergency number for further assistance.

• When antifreeze comes in contact with the skin or clothing, wash it off immediately.

• Do not mix different types of Antifreeze. The mixture can produce chemical reaction causing harmful substances.

• Antifreeze is extremely flammable and explosive under certain conditions. Keep fire and children away from antifreeze.

• When draining fluids from the engine, place some container underneath the engine body.

• Do not pour waste onto the grounds, down a drain, or into any water source.

• Also, observe the relevant environmental protection regulations when disposing of antifreeze.

Always use a 50/50 mix of long-life coolant and clean soft water

in KUBOTA engines.

1. Long-life coolant (hereafter LLC) comes in several types. Use ethylene glycol (EG) type for this engine.

2. Before employing LLC-mixed cooling water, fill the radiator with fresh water and empty it again. Repeat this procedure 2 or 3 times to clean up the inside.

3. Mixing the LLC Premix 50 % LLC with 50% clean soft water. When mixing, stir it up well, and then fill into the radiator.

4. The procedure for the mixing of water and antifreeze differs according to the make of the antifreeze and the ambient temperature. Refer to SAE J1034 standard, more specifically also to SAE J814c.

5. Adding the LLC (1) Add only water if the mixture reduces in amount by evaporation. (2) If there is a mixture leak, add the LLC of the same manufacturer and type in the same mixture percentage. *Never add any long-life coolant of different manufacturer. (Different brands may have different additive components, and the engine may fail to perform as specified.)

6. When the LLC is mixed, do not employ any radiator cleaning agent. The LLC contains anticorrosive agent. If mixed with the cleaning agent, sludge may build up, adversely affecting the engine parts.

7. Kubota's genuine long-life coolant has a service life of 2 years. Be sure to change the coolant every 2 years.

(To be continued)

G-36

Page 56

STW34, STW37, STW40, WSM

NOTE

CAUTION

IMPORTANT

NOTE

KiSC issued 11, 2014 A

(Continued)

GENERAL

[11] OTHERS

Vol % Anti-freeze

50 −37 −34 108 226

* At 1.013 × 105 Pa (760 mmHg) pressure (atmospheric). A higher boiling point is obtained by using a radiator pressure cap which permits the development of pressure within the cooling system.

Freezing Point Boiling Point*

°C °F °C °F

• The above data represent industry standards that necessitate a minimum glycol content in the concentrated antifreeze.

9Y1211109GEG0039US0

Bleeding Fuel System

Air must removed:

1. When the fuel filter or lines are removed.

2. When tank is completely empty.

3. After the tractor has not been used for a long period of time.

• Do not bleed the fuel system when the engine is hot.

Bleeding procedure is as follows:

1. Fill the fuel tank with fuel, and open the fuel valve (1).

2. Open the air vent valve (2) on the fuel injection pump.

3. Start the engine and run for about 30 seconds, and then stop the engine.

4. Close the air vent valve.

• Always close the air vent valve (2) except for bleeding fuel lines. Otherwise, engine runs irregularly or stalls frequently.

(1) Fuel Valve (2) Air Vent Valve

A: CLOSE B: OPEN

9Y1211109GEG0040US0

Draining Clutch Housing Water

• The tractor is equipped with water drain plug (1) under the clutch housing.

• After operating in rain, snow or tractor has been washed, water may get into the clutch housing.

1. Remove the water drain plug (1) and drain the water, then install the plug again.

(1) Water Drain Plug

9Y1211109GEG0041US0

G-37

Page 57

STW34, STW37, STW40, WSM

IMPORTANT

KiSC issued 11, 2014 A

GENERAL

Replacing Fuse

1. The tractor electrical system is protected from potential damage by fuses. A blown fuse indicates that there is an overload or short somewhere in the electrical system.

2. If any of the fuses should blow, replace with a new one of the same capacity.

• Before replacing a blown fuse, determine why the fuse blew and make any necessary repairs. Failure to follow this procedure may result in serious damage to the tractor electrical system. Refer to troubleshooting section of this manual.

 Protected circuit

FUSE

(10) 7.5 Air conditioner compressor – 

(12) 30 Starter 

(13) 20 Defogger – 

(14) 5 Radio (Battery) – 

(15) 20 Air conditioner blower – 

(16) 30 Head light 

(17) 5 Instrument panel (Battery) 

(18) 5 Controller (Battery) 

(19) 7.5 Radio (ACC) – 

Capacity

No.

(1) 15 Work light – 

(2)

(3) 5 Lamp relay 

(4) 5 Key stop 

(5) 10 Controller (Ignition) 

(6) 10 Alternator 

(7) 10 Brake lamp 

(8) 10 Beacon lamp 

(9) 15 Hazard light 

(11) 15 Wiper – 

(A)

ROPS

10A

CAB

30A

Electrical outlet

Protected circuit

ROPS

[A]



CAB

[B]

9Y1211109GEG0042US0

G-38

Page 58

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

GENERAL

Replacing Slow-Blow Fuses

The slow-blow fuses are intended to protect the electrical cabling. If any of them has blown out, be sure to pinpoint the cause. Never use any substitute, use only a KUBOTA genuine part.

[ROPS model]

FUSE No. Capacity (A) Protected circuit

(1) 40 Glow

(2) 40 Key stop

(3) 40 Main switch

(4) 50 Main

[CAB model]

FUSE No. Capacity (A) Protected circuit

(1) 40 Glow

(2) 40 Key stop

(3) 30 Electrical outlet

(4) 40 Main switch

(5) 50 Main

9Y1211109GEG0043US0

Replacing Light

1. Head lights and rear combination lights.

Take the bulb out of the light body and replace with a new one.

2. Other light:

Detach the lens and replace the bulb.

Light Capacity

Head lights 45 W /40 W

Tail light 5 W

Brake stop light 21 W

Turn signal / Hazard light 21 W

Front position light 5 W

Dome light 5 W

Work light (if equipped) 35 W

Number plate light 10 W

9Y1211109GEG0044US0

Lubricating Points [CAB Model]

(1) Door Hinge (2) Rear Window Hinge

9Y1211109GEG0046US0

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STW34, STW37, STW40, WSM

WARNING

IMPORTANT

KiSC issued 11, 2014 A

GENERAL

Adding Washer Liquid [CAB Model]

Add a proper amount of automobile washer liquid.

1.2 L

Washer tank Capacity

(1) Washer Liquid Tank

1.3 U.S.qts

1.1 Imp.qts

9Y1211109GEG0047US0

Checking the Amount of Refrigerant (Gas) [CAB Model]

To avoid personal injury or death:

• Liquid contact with eyes or skin may cause frostbite.

• In the event of a leakage, wear safety goggles. Escaping refrigerant can cause severe injuries to eyes.

• In contact with a flame, R134a refrigerant gives a toxic gas.

• Do not disconnect any part of the refrigeration circuit of the air conditioning system.

A shortage of refrigerant impairs the air-conditioner

performance. Check the following points. If it is indicated that the amount of refrigerant is extremely low, ask your dealer to inspect and charge.

 Checking procedure

1. Run the air-conditioner in the following conditions.

-1

• Engine speed: About 1500 min

(rpm)

• Temperature control dial: Maximum cooling position

• Fan switch: Highest blow (HI)

• Air-conditioner switch: ON

2. Look into the sight glass to see if the refrigerant is flowing through its circuit.

• Charge only with R134a not R12 refrigerant (gas).

(1) Sight Glass (2) Proper (3) Low (4) Overfull or No Refrigerant

(A) Little or no air bubbles in the

refrigerant flow.

(B) Lots of air bubbles in the

refrigerant flow (air bubbles or foam passing continuously).

9Y1211109GEG0048US0

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Page 60

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

8. SPECIAL TOOLS

[1] SPECIAL TOOLS FOR ENGINE

Special Use Puller Set

Code No.

• 07916-09032

Application

• Use exclusively to pull out bearing, gears and other parts with ease.

Piston Ring Compressor

Code No.

• 07909-32111

Application

• Use exclusively to push in the piston with piston rings into the cylinder.

GENERAL

WSM000001GEG0011US0

WSM000001GEG0012US0

Piston Ring Tool

Code No.

• 07909-32121

Application

• Use exclusively to remove or install the piston ring with ease.

WSM000001GEG0013US0

Diesel Engine Compression Tester (for Injection Nozzle)

Code No.

• 07909-30208 (Assembly)

• 07909-30934 (A to F)

• 07909-31211 (E and F)

• 07909-31231 (H)

• 07909-31251 (G)

• 07909-31271 (I)

• 07909-31281 (J)

Application

• Use to measure diesel engine compression and diagnostics of need for major overhaul.

(1) Gauge (2) L Joint (3) Adaptor A (4) Adaptor B (5) Adaptor C (6) Adaptor E

(7) Adaptor F (8) Adaptor G (9) Adaptor H (10) Adaptor I (11) Adaptor J

WSM000001GEG0014US0

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Page 61

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

GENERAL

Oil Pressure Tester

Code No.

• 07916-32032

Application

• Use to measure lubricating oil pressure.

(1) Gauge (2) Cable (3) Threaded Joint (4) Adaptor 1

(5) Adaptor 2 (6) Adaptor 3 (7) Adaptor 4 (8) Adaptor 5

WSM000001GEG0015US0

Valve Seat Cutter

Code No.

• 07909-33102

Application

• Use to reseat valves.

Angle

• 0.79 rad (45 °)

• 0.26 rad (15 °)

Diameter

• 28.6 mm (1.13 in.)

• 31.6 mm (1.24 in.)

• 35.0 mm (1.38 in.)

• 38.0 mm (1.50 in.)

• 41.3 mm (1.63 in.)

• 50.8 mm (2.00 in.)

WSM000001GEG0016US0

Radiator Tester

Code No.

• 07909-31551

Application

• Use to check of radiator cap pressure, and leaks from cooling system.

Remarks

• Adaptor (1) BANZAI Code No. RCT-2A-30S.

(1) Adaptor

WSM000001GEG0017US0

Connecting Rod Alignment Tool

Code No.

• 07909-31661

Application

• Use to check the connecting rod alignment.

Applicable range

• Connecting rod big end I.D. 30 to 75 mm dia. (1.2 to 2.9 in. dia.)

• Connecting rod length

65.0 to 300 mm (2.56 to 11.8 in.)

WSM000001GEG0020US0

Nozzle Tester

Code No.

• 07909-31361

Application

• Use to check the fuel injection pressure and spray pattern of nozzle.

Measuring range

• 0 to 50 MPa (0 to 500 kgf/cm

, 0 to 7200 psi)

WSM000001GEG0021US0

G-42

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STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

GENERAL

Auxiliary Socket For Fixing Crankshaft Sleeve

Code No.

• 07916-32091

Application

• Use to fix the crankshaft sleeve of the diesel engine.

WSM000001GEG0095US0

Plastigauge

Code No.

• 07909-30241

Application

• Use to check the oil clearance between crankshaft and bearing, etc..

Measuring range

• Green: 0.03 to 0.07 mm (0.001 to 0.003 in.)

• Red: 0.05 to 0.1 mm (0.002 to 0.006 in.)

• Blue: 0.1 to 0.2 mm (0.004 to 0.009 in.)

WSM000001GEG0022US0

Red Check

Code No.

• 07909-31371

Application

• Use to check cracks on cylinder head, cylinder block, etc..

WSM000001GEG0023US0

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STW34, STW37, STW40, WSM

NOTE

KiSC issued 11, 2014 A

• The following special tools are not provided, so make them referring to the figure.

Valve Guide Replacing Tool

Application

• Use to press out and press fit the valve guide.

A 20 mm dia. (0.79 in. dia.)

B 11.7 to 11.9 mm dia. (0.460 to 0.468 in. dia.)

C 6.5 to 6.6 mm dia. (0.256 to 0.259 in. dia.)

D 225 mm (8.86 in.)

E 70 mm (2.76 in.)

F 45 mm (1.77 in.)

G 25 mm dia. (0.98 in. dia.)

H 5 mm (0.197 in.)

I 6.7 to 7.0 mm dia. (0.263 to 0.275 in. dia.)

J 20 mm dia. (0.787 in. dia.)

K 12.5 to 12.8 mm dia. (0.492 to 0.504 in. dia.)

L 8.9 to 9.1 mm (0.350 to 0.358 in.)

C1 Chamfer 1.0 mm (0.039 in.)

C2 Chamfer 2.0 mm (0.079 in.)

C0.3 Chamfer 0.3 mm (0.012 in.)

GENERAL

9Y1211109GEG0050US0

9Y1211109GEG0051US0

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STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

Injection Pump Pressure Tester

Application

• Use to check fuel tightness of injection pumps.

Pressure gauge full scale: More than 29.4 MPa

(300 kgf/cm

B Copper gasket

C Flange (Material: Steel)

D Hex. nut 27 mm (1.06 in.) across the plat

E Injection pipe

F PF 1/2

G 5 mm (0.20 in.)

H 17 mm dia. (0.67 in. dia.)

I 8 mm dia. (0.31 in. dia.)

J 1.0 mm (0.039 in.)

K 17 mm dia. (0.67 in. dia.)

L 6.10 to 6.20 mm dia. (0.2402 to 0.2441 in. dia.)

M 8 mm (0.31 in.)

N 4 mm (0.16 in.)

O 11.97 to11.99 mm dia. (0.4713 to 0.4721 in. dia.)

P PF 1/2

Q 23 mm (0.91 in.)

R 17 mm (0.67 in.)

S 4 mm (0.16 in.)

T 12.00 to 12.02 mm dia. (0.4724 to 0.4732 in. dia.)

U 100 mm (3.94 in.)

V M12 × P1.5

a Adhesive application

b Fillet welding on the enter circumference

, 4267 psi)

9Y1211109GEG0052US0

Bushing Replacing Tools

Application

• Use to press out and press fit the bushing.

1. For small end bushing

A 162 mm (6.38 in.)

B 35 mm (1.38 in.)

C 27 mm (1.06 in.)

D 35 mm dia. (1.38 in. dia.)

E 27.90 to 27.95 mm dia. (1.098 to 1.100 in. dia.)

F 25.00 to 25.01 mm dia. (0.984 to 0.985 in. dia.)

2. For idle gear bushing

A 175 mm (6.89 in.)

B 40 mm (1.57 in.)

C 38 mm (1.49 in.)

D 45 mm dia. (1.77 in. dia.)

E 41.90 to 41.95 mm dia. (1.650 to 1.652 in. dia.)

F 37.95 to 37.97 mm dia. (1.494 to 1.495 in. dia.)

9Y1211109GEG0053US0

GENERAL

G-45

Page 65

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

GENERAL

Flywheel Stopper

Application

• Use to loosen and tighten the flywheel screw.

A 200 mm (7.87 in.)

B 30 mm (1.18 in.)

C 20 mm (0.79 in.)

D 15 mm (0.59 in.)

E 5 mm (0.20 in.)

F 8 mm (0.31 in.)

G 10 mm dia. (0.39 in. dia.)

9Y1211109GEG0054US0

Crankshaft Bearing 1 Replacing Tool

Application

• Use to press out and press fit the crankshaft bearing 1.

1. Extracting tool

A 135 mm (5.31 in.)

B 72 mm (2.83 in.)

C R40 mm (R1.57 in.)

D 10 mm (0.39 in.)

E 20 mm (0.79 in.)

F 20 mm dia. (0.79 in. dia.)

G 56.8 to 56.9 mm dia. (2.236 to 2.240 in. dia.)

H 51.8 to 51.9 mm dia. (2.039 to 2.043 in. dia.)

2. Inserting tool

A 130 mm (5.12 in.)

B 72 mm (2.83 in.)

C R40 mm (R1.57 in.)

D 9 mm (0.35 in.)

E 4 mm (0.16 in.)

F 20 mm (0.79 in.)

G 20 mm dia. (0.79 in. dia.)

H 68 mm dia. (2.68 in. dia.)

I 51.8 to 51.9 mm dia. (2.039 to 2.043 in. dia.)

J 56.8 to 56.9 mm dia. (2.236 to 2.240 in. dia.)

9Y1211109GEG0055US0

G-46

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STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

[2] SPECIAL TOOLS FOR TRACTOR

Tie-rod End Lifter

Code No.

• 07909-39051

Application

• Use to remove the tie-rod end with ease.

Steering Wheel Puller

Code No.

• 07916-51090

Application

• Use to remove the steering wheel without damage to the steering shaft.

GENERAL

WSM000001GEG0029US0

WSM000001GEG0030US0

Long Connector

Code No.

• 07916-60831

Application

• Use for checking HST Charge relief pressure.

9Y1211109GEG0056US0

Clutch Center Tool (For B and L Series Tractors)

Application

• The clutch center tool is for all B and L series tractors with a diaphragm clutch by changing tip guides. Center piece diameter is 20 mm (0.79 in.).

WSM000001GEG0032US0

Toe-in Gauge

Code No.

• 07909-31681

Application

• This allows easy measurement of toe-in for all machine models.

WSM000001GEG0034US0

G-47

Page 67

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

GENERAL

Clutch Pack Disassembly Tool

Code No.

• 07916-53741

Application

• This allows easy installation of bi-speed clutch pack spring.

9Y1211109GEG0057US0

Adaptor 7

Code No.

• 07916-32951

Application

• Use for checking regulating valve setting pressure.

9Y1211109GEG0058US0

Relief Valve Pressure Tester

Code No.

• 07916-50045

Application

• This allows easy measurement of relief set pressure.

(1) Gauge (07916-50322) (2) Cable (07916-50331) (3) Threaded Joint (07916-50401) (4) Threaded Joint (07916-50341) (5) Adaptor B (M18 × P1.5)

(07916-50361)

(6) Adaptor C (PS3/8) (07916-50371) (7) Adaptor D (PT1/8) (07916-50381) (8) Adaptor E (PS3/8) (07916-50392) (9) Adaptor F (PF1/2) (07916-62601) (10) Adaptor 58 (PT1/4) (07916-52391)

WSM000001GEG0027US0

Flow Meter

Code No.

• 07916-52791 (Flow Meter)

• 07916-52651 (Hydraulic Test Hose)

Application

• This allows easy testing of hydraulic system.

(1) Flow Meter (2) Hydraulic Test Hose

WSM000001GEG0036US0

Adaptor Set for Flow Meter

Code No.

• 07916-54031

Application

• Use for test of the hydraulic system.

(1) Adaptor 52 (2) Adaptor 53 (3) Adaptor 54 (4) Adaptor 61 (5) Adaptor 62 (6) Adaptor 63 (7) Adaptor 64

(8) Adaptor 65 (9) Adaptor 66 (10) Adaptor 67 (11) Adaptor 68 (12) Adaptor 69 (13) Hydraulic Adaptor 1

G-48

WSM000001GEG0037US0

Page 68

STW34, STW37, STW40, WSM

NOTE

KiSC issued 11, 2014 A

• The following special tools are not provided, so make them referring to the figure.

Adaptor for Flow Meter

Application

• Use for checking the hydraulic pump for 3P linkage.

• When using, attach with following parts. O-ring: 04811-00180

A 2-8.5 mm dia. (2-0.334 in. dia.)

B 40 mm (1.57 in.)

C 0.52 rad (30 °)

D 25 mm (0.98 in.)

E 15 mm (0.59 in.)

F 3 mm (0.118 in.)

G 1.7 to 1.9 mm (0.067 to 0.075 in.)

H 3.0 to 3.25 mm (0.118 to 0.128 in.)

I 8.0 mm dia. (0.315 in. dia.)

J 23.9 to 24.1 mm dia. (0.941 to 0.945 in. dia.)

K 60 mm dia. (2.36 in. dia.)

L PS 3/8

M 1.5 mm Round (0.059 in. Round)

N 0.3 mm Round (0.012 in. Round)

O Chamfer 0.2 mm (0.0078 in.)

Hydraulic Arm Shaft Bushing Replacing Tool

Application

• Use for replacing the hydraulic arm shaft bushing in the hydraulic cylinder block.

Right Left

37.90 to 37.95 mm dia.

(1.492 to 1.494 in. dia.)

B 40 mm (1.575 in.) 35 mm (1.378 in.)

C 28 mm dia. (1.102 in. dia.) 25 mm dia. (0.984 in. dia.)

D 44.5 mm dia. (1.75 in. dia.)

E 30 mm dia. (1.18 in. dia.)

F 50 mm (1.97 in.)

G 10 mm (0.39 in.)

Piston Gasket Correcting Tool

Application

• Compress the power steering cylinder piston gasket to the correct side when install the cylinder rod to the cylinder tube with ease.

A 13.97 mm (0.55 in.)

B 35.052 mm (1.38 in.)

C 0.122 rad (7 °)

D 40.000 to 40.039 mm dia. (1.57 to 1.58 in. dia.)

E 46 mm dia. (1.82 in. dia.)

GENERAL

9Y1211109GEG0059US0

9Y1211109GEG0060US0

34.90 to 34.95 mm dia. (1.374 to 1.376 in. dia.)

9Y1211109GEG0061US0

9Y1211109GEG0062US0

G-49

Page 69

STW34, STW37, STW40, WSM

WARNING

IMPORTANT

NOTE

KiSC issued 11, 2014 A

GENERAL

9. TIRES

[1] TIRE PRESSURE

To avoid personal injury or death:

• Do not attempt to mount a tire on a rim. This should be done by a qualified person with the proper equipment.

• Always maintain the correct tire pressure. Do not inflate tires above the recommended pressure shown in the operator's manual.

• Do not use tires other than those approved by KUBOTA.

 Inflation Pressure

Though the tire pressure is factory-set to the prescribed level, it naturally drops slowly in the course of time. Thus,

check it everyday and inflate as necessary.

• Maintain the maximum pressure in front tires, if using a front loader or when equipped with a full load of front weights.

Tire sizes Inflation pressure

, 19.9 psi)

, 14.2 psi)

, 25.6 psi)

, 22.8 psi)

9Y1211109GEG0063US0

Rear

Front

9.5-22, 4PR 140 kPa (1.4 kgf/cm

13.6-16, 4PR 100 kPa (1.0 kgf/cm

6.00-12, 4PR 180 kPa (1.8 kgf/cm

24 × 8.50-14, 4PR 160 kPa (1.6 kgf/cm

G-50

Page 70

STW34, STW37, STW40, WSM

WARNING

IMPORTANT

KiSC issued 11, 2014 A

GENERAL

[2] TREAD

To avoid personal injury or death:

• A When working on slopes or when working with trailer, set the wheel tread as wide as practical for maximum stability.

• Support tractor securely on stands before removing a wheel.

• Do not work under any hydraulically supported devices. They can settle, suddenly leak down, or be accidentally lowered. If necessary to work under tractor or any machine elements for servicing or adjustment, securely support them with stands or suitable blocking beforehand.

• Never operate tractor with a loose rim, wheel, or axle.

9Y1211109GEG0064US0

Wheel Tightening Screws and Nuts

• Do not turn front discs to obtain wider tread.

• When re-fitting or adjusting a wheel, tighten the bolts to the following torques then recheck after driving the tractor 200 m (219 yards) and 10 times of shuttle movement by 5 m (5 yards), and thereafter according to service interval.

1. When refitting or adjusting a wheel, tighten the screws and nuts with specified tightening torque.

2. Recheck after driving the tractor 200 m (219 yards) and therefore according to service interval.

Front wheel mounting screw and nut

Tightening torque

Rear wheel mounting screw and nut

85 N·m

9.0 kgf·m

65.1 lbf·ft

215 N·m

22.0 kgf·m

159.1 lbf·ft

(1) Front Wheel (2) Rear Wheel

9Y1211109GEG0065US0

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Page 71

STW34, STW37, STW40, WSM

IMPORTANT

KiSC issued 11, 2014 A

GENERAL

(1) Front Wheels

Front wheel tread can not be adjusted.

• Do not turn front discs to obtain wider tread.

• Do not turn front discs to obtain wider tread. In setting up the front wheels, make sure that the inflation valve stem of the tires face outward.

Models STW34, STW37, STW40

Tires 6.00-12 Farm 24 × 8.50-14 Turf

Tread 1020 mm (40.16 in.) 1020 mm (40.16 in.)

9Y1211109GEG0066US0

(2) Rear Wheels

Rear tread width can be adjusted as shown with the standard equipped tires. To change the tread width

1. Remove the wheel rim and / or disk mounting bolts.

2. Change the position of the rim and / or disk (right and left) to the desired position, and tighten the bolts.

• Always attach wheels as shown in the drawing.

• If not attached as illustrated, transmission parts may be damaged.

• To attach 13.6-16 rear tires, need to use rear tire spacer.

Tires 9.5-22 Farm 13.6-16 Turf

Tread

(1) 950 mm (37.40 in.) (2) 1070 mm (42.13 in.) (3) 990 mm (39.0 in.) (4) 1055 mm (41.54 in.)

9Y1211109GEG0067US0

G-52

Page 72

STW34, STW37, STW40, WSM

IMPORTANT

CAUTION

KiSC issued 11, 2014 A

GENERAL

[3] TIRE LIQUID INJECTION

Auxiliary weights can be used to increase traction force for plowing in fields or clayey ground.

Another way is to inject water or another liquid, such as a calcium chloride solution in the tires. Water must not be used in winter since it freezes at 0 °C (32 °F). The calcium chloride solution will not freeze and moreover, affords higher effect than water since its specific gravity is higher than that of water by about 20 %. Below is an explanation of calcium chloride solution injection.

• Do not fill the front tires with liquid.

9Y1211109GEG0068US0

Preparation of Calcium Chloride Solution

• When making a calcium chloride solution, do not pour water over calcium chloride since this results in chemical reaction which will cause high temperature. Instead add a small amount of calcium chloride to the water at a time until the desired solution is achieved.

Freezing temperature

−5 °C (23 °F) 12 kg (26.4 lbs)

−10 °C (14 °F) 21 kg (46.3 lbs)

−15 °C (5 °F) 28 kg (61.7 lbs)

−20 °C (−4 °F) 34 kg (75.0 lbs)

−25 °C (−13 °F) 40 kg (88.2 lbs)

−30 °C (−22 °F) 44 kg (97.0 lbs)

−35 °C (−31 °F) 49 kg (108 lbs)

−40 °C (−40 °F) 52 kg (114.6 lbs)

−45 °C (−49 °F) 56 kg (123.5 lbs)

−50 °C (−58 °F) 61 kg (134.5 lbs)

Weight of CaCl

(26.5 U.S.gals, 22.0 Imp.gals) of water

to be dissolved in 100 L

(a) Water (b) CaCl

(Calcium Chloride)

A: Bad B: Good

9Y1211109GEG0069US0

Attaching Injector

1. Lift the rear tires off the ground.

2. Turn the tire so that the air valve is at the top.

3. Remove the air valve, and attach the injector. (Code No. 07916-52501)

(1) Injector (2) Hose

9Y1211109GEG0070US0

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Page 73

STW34, STW37, STW40, WSM

CAUTION

NOTE

KiSC issued 11, 2014 A

GENERAL

Injection

• When a calcium chloride solution is used, cool it before pouring it into the tire.

• Do not fill tires with water or solution more than 75 % of full capacity (to the valve stem level).

The following four ways can be used to inject water or a calcium

chloride solution into tires.

1. Gravity injection (Fig. 1)

2. Pump injection (Fig. 2)

3. Pressure tank injection (Fig. 3)

4. Injection directly from top (only when water is being used).

• Once injection is completed, reset the air valve, and pump air into the tire to the specified pressure.

Weight of Calcium Chloride Solution Filling 75 % of Full

Capacity of a Tire

Tire sizes 9.5-22

Slush free at −10 °C (14 °F) Solid at −30 °C (−22 °F) [Approx. 1 kg (2 lbs) CaCl water]

Slush free at −24 °C (−11 °F ) Solid at −47 °C (−52 °F) [Approx. 1.5 kg (3.5 lbs) CaCl water]

Slush free at −47 °C (−52 °F) Solid at −52 °C (−62 °F) [Approx. 2.25 kg (5 lbs) CaCl water]

per 4 L (1 gal) of

68 kg (150 lbs)

72 kg (159 lbs)

76 kg (168 lbs)

(1) Pump (2) Pressure Tank (3) Compressor (4) Air (5) Water

(A) Correct: 75 % Air Compresses

Like a Cushion

(B) Incorrect: 100 % Water can not be

Compressed

9Y1211109GEG0071US0

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Page 74

1 ENGINE

KiSC issued 11, 2014 A

Page 75

MECHANISM

KiSC issued 11, 2014 A

CONTENTS

1. LUBRICATING SYSTEM ............................................................................................................1-M1

2. COOLING SYSTEM ................................................................................................................... 1-M2

3. FUEL SYSTEM........................................................................................................................... 1-M3

Page 76

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

1. LUBRICATING SYSTEM

ENGINE

(1) Rocker Arm (2) Oil Pressure Switch (3) Rocker Arm Shaft (4) Valve (5) Governor Shaft (6) Idle Gear (7) Crankshaft (8) Oil Pump (9) Oil Strainer (10) Relief Valve (11) Oil Filter Cartridge (12) Push Rod (13) Tappet (14) Camshaft (15) Piston (16) Connecting Rod

A lubricating system consists of an oil strainer (9), oil pump (8), relief valve (10), oil filter cartridge (11) and oil

pressure switch (2).

The oil pump sucks lubricating oil from the oil pan through the oil strainer and the oil flows down to the oil filter cartridge where it is further filtered. Then the oil is forced to crankshaft (7), connecting rods (16), idle gear (6), governor shaft (5), camshaft (14) and rocker arm shaft (3) to lubricate each part through the oil gallery.

9Y1211109ENM0001US0

1-M1

Page 77

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

2. COOLING SYSTEM

ENGINE

Bottom bypass system is introduced in 03-M Series

for improving the cooling performance of the radiator.

While the temperature of coolant in the engine is low, the thermostat is held closed and the coolant is allowed to flow through the bypass pipe and to circulate in the engine.

When the temperature exceeds the thermostat valve opening level, the thermostat fully opens itself to prevent the hot coolant from flowing through the bypass into the engine.

In this way, the radiator can increase its cooling performance.

(1) Thermostat (A) Thermostat Closed

(B) Thermostat Open

9Y1211109ENM0002US0

1-M2

Page 78

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

3. FUEL SYSTEM

ENGINE

(1) Fuel Overflow Pipe (2) Injection Nozzle (3) Injection Pipe

(4) Fuel Tank (5) Injection Pump Air Vent Pipe (6) Injection Pump

(7) Fuel Filter (8) Fuel Feed Pump (9) Fuel Filter Air Vent Pipe

a: Injected Fuel Flow b: Returned Fuel Flow

The fuel system of this tractor is shown in the diagram above. Fuel from the tank flows in the passage as shown by the arrows, and is injected from the nozzle via the fuel

injection pump. Overflow fuel returns to the tank.

The system includes filters and other concerns to protect it from entrance of air, water and dust.

While the engine is operating, fuel is fed into the injection pump (6) by the fuel feed pump (8) after passing through the fuel filter (7). The fuel camshaft actuates the injection pump and force-feeds fuel to the injection nozzle (2) through the injection pipe (3). Fuel is then sprayed through the nozzle into the combustion chamber. The fuel discharged after lubricating and cooling the injection nozzle is returned to the fuel tank (4) automatically through the overflow pipe (1).

9Y1211109ENM0003US0

1-M3

Page 79

SERVICING

KiSC issued 11, 2014 A

CONTENTS

1. TROUBLESHOOTING.................................................................................................................1-S1

2. SERVICING SPECIFICATIONS ..................................................................................................1-S5

3. TIGHTENING TORQUES ..........................................................................................................1-S10

4. CHECKING, DISASSEMBLING AND SERVICING ...................................................................1-S12

[1] CHECKING AND ADJUSTING............................................................................................1-S12

(1) Engine Body ..................................................................................................................1-S12

(2) Lubricating System ........................................................................................................1-S15

(3) Cooling System .............................................................................................................1-S15

(4) Fuel System...................................................................................................................1-S18

[2] PREPARATION................................................................................................................... 1-S20

(1) Separating Engine from Tractor for ROPS .................................................................... 1-S20

(2) Separating Engine from Tractor for CABIN ...................................................................1-S30

[3] DISASSEMBLING AND ASSEMBLING ..............................................................................1-S47

(1) Cylinder Head and Valves .............................................................................................1-S47

(2) Timing Gears, Camshaft and Fuel Camshaft ................................................................1-S51

(3) Piston and Connecting Rod...........................................................................................1-S56

(4) Crankshaft .....................................................................................................................1-S59

(5) Thermostat and Water Pump ........................................................................................ 1-S62

[4] SERVICING.........................................................................................................................1-S63

(1) Cylinder Head and Valves .............................................................................................1-S63

(2) Timing Gears, Camshaft and Fuel Camshaft ................................................................1-S68

(3) Piston and Connecting Rod...........................................................................................1-S71

(4) Crankshaft .....................................................................................................................1-S73

(5) Cylinder .........................................................................................................................1-S77

(6) Oil Pump........................................................................................................................1-S78

Page 80

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

1. TROUBLESHOOTING

ENGINE

Symptom

Stator Motor Does not Operate

Probable Cause and Checking Procedure

1. Battery is discharged. Recharge battery. G-29

2. Battery is damaged. Replace battery. –

3. Slow blow fuse is blown. Replace slow blow fuse. G-38

4. PTO control switch is engaged.

5. Safety switch (clutch pedal and HST) is damaged.

6. Seat switch is damaged. Replace seat 9-S26

7. Rear PTO switch is damaged.

8. Mid PTO switch is damaged.

9. OPC controller is damaged.

10.Main switch is damaged. Replace main switch 9-S12,

11.Starter motor is damaged. Replace or repair starter motor. 9-S25

Disengage PTO control switch. –

Replace or adjust safety switch. 9-S26

Replace or adjust rear PTO switch 9-S39

Replace or adjust mid PTO switch 9-S39

Replace OPC controller 9-S30

Solution

Reference

Page

9-S14

1-S1

Page 81

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

ENGINE

Symptom

Engine Does Not Start

Probable Cause and

Checking Procedure

Solution

Reference

Page

1. Fuel tank is empty. Fill fuel to fuel tank. G-8

2. Fuel filter is clogged. Replace fuel filter. G-25

3. Air is in the fuel system. Bleed air. G-37

4. Fuel pipe or fuel hose is

Clean or replace fuel pipe or fuel hose. G-26

clogged.

5. Water is in the fuel system. Change fuel and repair or replace fuel

G-8, G-25

system.

6. Injection nozzle is stuck or

Replace or repair injection nozzle 1-S19

clogged.

7. Fuel is leaking due to

Tighten retaining nut. 1-S47 loose injection pipe retaining nut.

8. Fuel with low cetane

Use specified fuel G-8 number is used.

9. Excessively high viscosity

Use specified fuel or engine oil. G-8 of fuel or engine oil is used at low temperature.

10.Injection pump is

Replace or repair injection pump. 1-S51 damaged.

11.Compression is leaking from cylinder.

Replace head gasket, tighten cylinder head bolt, glow plug and nozzle holder.

1-S49, 1-S58, 1-S64, 1-S72,

1-S77

12.Piston ring and cylinder is

Replace piston ring and cylinder. 1-S72

worn out.

13.Fuel cam shaft is worn out. Replace fuel camshaft. 1-S55

14.Crankshaft, camshaft, piston or bearing is seized.

Repair or replace crankshaft, camshaft, piston or bearing.

1-S55, 1-S57, 1-S60,

1-S61

15.Valve timing is improper. Correct valve timing 1-S14

16.Incorrect injection timing. Adjust injection timing 1-S18

1-S2

Page 82

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

ENGINE

Symptom

Engine Revolution Is Not Smooth

Either White or Blue Exhaust Gas Is Observed

Either Black or Dark Gray Exhaust Gas Is Observed

Tractor Operator Feels Deficient Engine Output

Probable Cause and Checking Procedure

1. Fuel filter is clogged or

Solution

Replace fuel filter. G-25

Reference

Page

dirty.

2. Air cleaner element is

Clean or replace air cleaner element. G-24

clogged.

3. Fuel leak due to loose

Tighten retaining nut. 1-S47

injection pipe retaining nut.

4. Injection nozzle is stuck or

Replace or repair injection nozzle. 1-S19

clogged.

5. Crankshaft, camshaft, piston or bearing is seized.

Repair or replace crankshaft, camshaft, piston or bearing.

1-S55, 1-S57, 1-S60,

1-S61

6. Compression is leaking from cylinder.

Replace head gasket, tighten cylinder head bolt, glow plug and nozzle holder.

1-S49, 1-S58, 1-S64, 1-S72,

1-S77

7. Valve timing is improper. Correct valve timing. 1-S14

8. Piston and cylinder is worn

Replace piston and cylinder. 1-S72

out.

9. Valve clearance is

Adjust valve clearance. 1-S14

incorrect.

1. Engine oil is excessive. Reduce is to specified level engine oil. G-8

2. Piston ring and cylinder is

Replace piston ring and cylinder. 1-S72

worn or stuck.

1. Tractor is operated under

Reduce the load. –

overload condition.

2. Low grade fuel is used. Use specified fuel. G-8

3. Fuel filter is clogged. Replace fuel filter. G-25

4. Air cleaner element is

Clean or replace air cleaner element. G-24

clogged.

5. Injection nozzle is stuck or

Replace or repair injection nozzle. 1-S19

clogged.

1. Engine's moving parts is

Repair or replace engine's moving parts. –

stuck.

2. Injection pump is

Replace injection pump. 1-S51

damaged.

3. Injection nozzle stuck or

Replace or replace injection nozzle. 1-S19

clogged.

4. Compression is leaking. Check the compression pressure and

repair piston ring or cylinder

1-S12,

1-S72

(engine crankcase).

5. Air cleaner element is dirty

Clean or replace air cleaner element. G-24

or clogged.

1-S3

Page 83

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

ENGINE

Symptom

Lubricant Oil Consumption Is Excessive

Probable Cause and

Checking Procedure

1. Piston ring's gap faces the

Shift ring gap direction. 1-S57

Solution

same direction.

2. Oil ring is worn or stuck. Replace oil ring. 1-S58

3. Piston ring groove is worn

Replace piston and piston ring. 1-S57,

out.

4. Valve stem and valve

Replace valve stem and valve guide. 1-S50

Reference

Page

1-S58

guide is worn out.

5. Crankshaft bearing and crank pin bearing is worn

Replace crankshaft bearing and crank pin bearing.

1-S61

out.

Fuel Is Mixed into Lubricant Oil

Water Is Mixed into Lubricant Oil

1. Injection nozzle stuck or

Replace or replace injection nozzle. 1-S48

clogged.

2. Engine oil is diluted due to regeneration.

Change engine oil. 1-S20,

1-S31

1. Head gasket is damaged. Replace head gasket. 1-S49

2. Cylinder (crankcase) or cylinder head is flawed.

Replace cylinder (crankcase) or cylinder head.

1-S49

Oil Pressure Is Low 1. Engine oil is insufficient. Fill engine oil. G-8

2. Oil strainer is clogged. Clean oil strainer. 1-S56

3. Relief valve is stuck with

Clean relief valve. –

dirt.

4. Oil clearance of moving parts is excessive.

Replace moving parts. 1-S74,

1-S75,

1-S76

5. Oil passage is clogged. Clean oil passage. –

6. Different type of oil is used. Use specified type of oil. G-8

7. Oil pump is damaged. Replace oil pump. 1-S55

Oil Pressure Is High 1. Different type of oil is used. Use specified type of oil. G-8

2. Relief valve is damaged. Repair or replace relief valve. –

Engine Is Overheated 1. Engine oil is insufficient. Fill engine oil to proper level. G-16

2. Fan belt is broken or

Change or adjust fan belt. G-26

elongated.

3. Coolant is insufficient. Fill coolant. G-35

4. Radiator net and radiator

Clean radiator net and radiator fin. –

fin is clogged with dust.

5. Inside of radiator is corroded.

6. Coolant flow route is

Clean inside of radiator or replace

G-35

radiator.

Clean coolant flow route. G-35

corroded.

7. Radiator or radiator cap is

Replace radiator or radiator cap. 1-S16

damaged.

8. Engine is running under

Reduce the load. –

overload condition.

9. Cylinder head gasket is

Replace cylinder head gasket. 1-S49

damaged.

10.Unsuitable fuel is used. Use specified fuel. G-8

9Y1211109ENS0001US0

1-S4

Page 84

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

2. SERVICING SPECIFICATIONS

ENGINE BODY

Item Factory Specification Allowable Limit

Valve Clearance (When Cold) 0.18 to 0.22 mm

0.0071 to 0.0086 in.

Compression Pressure (When Cranking with Starting Motor)

3.6 to 4.0 MPa /

-1

290 min

(rpm)

36 to 41 kgf/cm

-1

290 min

(rpm)

520 to 580 psi /

-1

290 min

(rpm)

ENGINE

–

2.5 MPa /

-1

26 kgf/cm

290 min

(rpm)

-1

(rpm)

370 psi /

-1

290 min

(rpm)

Difference among Cylinders

–

Top Clearance 0.55 to 0.70 mm

10 % or less

–

0.022 to 0.027 in.

Cylinder Head Surface Flatness – 0.05 mm / 500 mm

0.002 in. / 19.7 in.

Valve Recessing Protrusion

0.05 mm

–

0.002 in.

Valve Stem to Valve Guide

• Valve Stem

Recessing

Clearance

O.D.

0.15 mm

0.0059 in.

0.040 to 0.070 mm

0.0016 to 0.0027 in.

7.960 to 7.975 mm

0.40 mm

0.016 in.

0.10 mm

0.0039 in.

–

0.3134 to 0.3139 in.

• Valve Guide

I.D.

8.015 to 8.030 mm

–

0.3156 to 0.3161 in.

Valve Face Angle (Intake)

1.0 rad

–

60 °

Angle (Exhaust)

0.79 rad

–

45 °

Valve Seat Width (Intake)

2.12 mm

–

0.0835 in.

Valve Seat Angle (Intake)

Valve Timing (Intake Valve) Open

Valve Timing (Exhaust Valve) Open

Width (Exhaust)

Angle (Exhaust)

1-S5

2.12 mm

0.0835 in.

1.0 rad 60 °

0.79 rad 45 °

0.21 rad (12 °) before T.D.C.

0.63 rad (36 °)

after B.D.C.

1.0 rad (60 °)

before B.D.C.

0.21 rad (12 °)

after T.D.C.

–

Page 85

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

Item Factory Specification Allowable Limit

Valve Spring Free Length

41.7 to 42.2 mm

1.65 to 1.66 in.

ENGINE

41.2 mm

1.62 in.

Setting Load / Setting Length

Tilt

118 N / 35.0 mm

12.0 kgf / 35.0 mm

26.5 lbs / 1.38 in.

–

100 N / 35.0 mm

10.2 kgf / 35.0 mm

22.5 lbs /1.38 in.

1.0 mm

0.039 in.

Rocker Arm Shaft to Rocker Arm

• Rocker Arm Shaft

Oil Clearance

O.D.

0.016 to 0.045 mm

0.00063 to 0.0017 in.

13.973 to 13.984 mm

0.10 mm

0.0039 in.

–

0.55012 to 0.55055 in.

• Rocker Arm

I.D.

14.000 to 14.018 mm

–

0.55119 to 0.55188 in.

Push Rod Alignment – 0.25 mm

0.0098 in.

Tappet to Tappet Guide

• Tappet

Oil Clearance

O.D.

0.020 to 0.062 mm

0.00079 to 0.0024 in.

23.959 to 23.980 mm

0.07 mm

0.003 in.

–

0.94327 to 0.94409 in.

• Tappet Guide

I.D.

24.000 to 24.021 mm

–

0.94489 to 0.94570 in.

Timing Gear

• Crank Gear to Idle Gear

Backlash

0.04150 to 0.1122 mm

0.001634 to 0.004417 in.

0.15 mm

0.0059 in.

• Idle Gear to Cam Gear

Backlash

0.04150 to 0.1154 mm

0.001634 to 0.004543 in.

• Idle Gear to Injection Pump Gear

Backlash

0.04150 to 0.1154 mm

0.001634 to 0.004543 in.

• Crank Gear to Oil Pump Gear

Backlash

0.04150 to 0.1090 mm

0.001634 to 0.004291 in.

Idle Gear Side Clearance 0.12 to 0.48 mm

0.0048 to 0.018 in.

Idle Gear Shaft to Idle Gear Bushing

Oil Clearance

0.025 to 0.066 mm

0.00099 to 0.0025 in.

• Idle Gear Shaft

O.D.

37.959 to 37.975 mm

1.4945 to 1.4950 in.

• Idle Gear Bushing

I.D.

38.000 to 38.025 mm

1.4961 to 1.4970 in.

Camshaft Side Clearance

0.070 to 0.22 mm

0.0028 to 0.0086 in.

Alignment

Cam Height

(Intake / Exhaust)

–

33.90 mm

1.335 in.

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.9 mm

0.0354 in.

0.10 mm

0.0039 in.

–

0.30 mm0.012 in.

0.01 mm

0.0004 in.

33.85 mm

1.333 in.

1-S6

Page 86

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

Item Factory Specification Allowable Limit

Camshaft Journal to Cylinder Block Bore

Oil Clearance

0.050 to 0.091 mm

0.0020 to 0.0035 in.

ENGINE

0.15 mm

0.0059 in.

• Camshaft Journal

O.D.

39.934 to 39.950 mm

–

1.5722 to 1.5728 in.

• Cylinder Block Bore

I.D.

40.000 to 40.025 mm

–

1.5748 to 1.5757 in.

Piston Pin Bore I.D. 25.000 to 25.013 mm

0.98426 to 0.98476 in.

Second Ring to Ring Groove Clearance 0.0930 to 0.128 mm

0.00367 to 0.00503 in.

Oil Ring to Ring Groove Clearance 0.020 to 0.060 mm

0.00079 to 0.0023 in.

Top Ring

Ring Gap

0.25 to 0.40 mm

0.0099 to 0.015 in.

Second Ring

Ring Gap

0.30 to 0.45 mm

0.012 to 0.017 in.

Oil Ring

Ring Gap

0.25 to 0.45 mm

0.0099 to 0.017 in.

25.05 mm

0.9862 in.

0.20 mm

0.0079 in.

0.15 mm

0.0059 in.

1.25 mm

0.0492 in.

1.25 mm

0.0492 in.

1.25 mm

0.0492 in.

Connecting Rod Alignment – 0.05 mm

0.002 in.

Piston Pin to Small End Bushing

Oil Clearance

0.014 to 0.038 mm

0.00056 to 0.0014 in.

0.15 mm

0.0059 in.

•Piston Pin

O.D.

25.002 to 25.011 mm

–

0.98433 to 0.98468 in.

• Small End Bushing

I.D.

25.025 to 25.040 mm

–

0.98524 to 0.98582 in.

Crankshaft Alignment – 0.02 mm

0.0008 in.

Crankshaft Journal to Crankshaft Bearing 1

• Crankshaft Journal

Oil Clearance

O.D.

0.0400 to 0.118 mm

0.00158 to 0.00464 in.

59.921 to 59.940 mm

0.20 mm

0.0079 in.

–

2.3591 to 2.3598 in.

• Crankshaft Bearing 1

I.D.

59.980 to 60.039 mm

–

2.3615 to 2.3637 in.

Crankshaft Journal to Crankshaft Bearing 2

Oil Clearance

0.0400 to 0.104 mm

0.00158 to 0.00409 in.

0.20 mm

0.0079 in.

• Crankshaft Journal O.D.

59.921 to 59.940 mm

–

2.3591 to 2.3598 in.

• Crankshaft Bearing 2 I.D.

59.980 to 60.025 mm

–

2.3615 to 2.3631 in.

1-S7

Page 87

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

Item Factory Specification Allowable Limit

Crankpin to Crankpin Bearing

Oil Clearance

0.025 to 0.087 mm

0.00099 to 0.0034 in.

• Crankpin O.D.

46.959 to 46.975 mm

1.8488 to 1.8494 in.

• Crankpin Bearing I.D.

47.000 to 47.046 mm

1.8504 to 1.8522 in.

Crankshaft Side Clearance 0.15 to 0.31 mm

0.0059 to 0.012 in.

Cylinder Bore (Standard) I.D. 87.000 to 87.022 mm

3.4252 to 3.4260 in.

Cylinder Bore (Oversize) I.D. 87.250 to 87.272 mm

3.4351 to 3.4359 in.

LUBRICATING SYSTEM

Item Factory Specification Allowable Limit

Engine Oil Pressure At Idle Speed

More than

98 kPa

1.0 kgf/cm

14 psi

ENGINE

0.20 mm

0.0079 in.

–

0.5 mm

0.02 in.

87.150 mm

3.4311 in.

87.400 mm

3.4409 in.

50 kPa

0.5 kgf/cm 7 psi

At Rated Speed

300 to 440 kPa

3.0 to 4.5 kgf/cm 43 to 64 psi

Engine Oil Pressure Switch Working Pressure 50 kPa

0.5 kgf/cm

7 psi

Inner Rotor to Outer Rotor Clearance 0.030 to 0.14 mm

0.0012 to 0.0055 in.

Outer Rotor to Pump Body Clearance 0.11 to 0.19 mm

0.0044 to 0.0074 in.

Inner Rotor to Cover Clearance 0.105 to 0.150 mm

0.00414 to 0.00590 in.

2.5 kgf/cm

36 psi

–

0.2 mm

0.008 in.

0.25 mm

0.0098 in.

0.20 mm

0.0079 in.

250 kPa

1-S8

Page 88

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

COOLING SYSTEM

Item Factory Specification Allowable Limit

Fan Belt Tension 10 to 12 mm /

(0.40 to 0.047 in.) deflection at 98 N

(10 kgf, 22 lbs) of force

Thermostat Valve Opening

Temperature

69.5 to 72.5 °C

157.1 to 162.5 °F

(At Beginning)

ENGINE

–

Valve Opening Temperature

85 °C

185 °F

–

(Opened Completely)

Radiator Water Tightness No leak at

–

specified pressure

Radiator Cap Pressure Falling

Time

More than 10 seconds

for pressure fall

–

from 90 to 60 kPa

from 0.9 to 0.6 kgf/cm

from 10 to 9 psi

FUEL SYSTEM

Item Factory Specification Allowable Limit

Injection Pump Injection Timing 0.30 to 0.33 rad

–

(17 to 19 °)

before T.D.C.

Pump Element Fuel Tightness – 13.7 MPa

140 kgf/cm

1990 psi

Delivery Valve Fuel Tightness 10 seconds

13.7 → 12.7 MPa

140 → 130 kgf/cm

1990 → 1850 psi

Injection Nozzle Injection Pressure 13.8 to 14.7 MPa

140 to 150 kgf/cm

5 seconds

13.7 → 12.7 MPa

140 → 130 kgf/cm

1990 → 1850 psi

–

2000 to 2130 psi

Injection Nozzle Valve Seat Valve Seat

Tightness

When the pressure is

12.7 MPa

(130 kgf/cm

, 1850 psi),

–

the valve seat must be

fuel tightness.

9Y1211109ENS0002US0

1-S9

Page 89

STW34, STW37, STW40, WSM

KiSC issued 11, 2014 A

ENGINE

3. TIGHTENING TORQUES

Tightening torques of screws, bolts and nuts on the table below are especially specified.

(For general use screws, bolts and nuts: Refer to See "5. TIGHTENING TORQUES" on page G-10.)

Item N·m kgf·m lbf·ft

Steering wheel mounting nut 48.1 to 55.9 4.9 to 5.7 35.4 to 41.2

Delivery hose R.H. retaining nut 24.5 to 29.4 2.5 to 3.0 18.1 to 21.7

Delivery hose L.H. retaining nut 24.5 to 29.4 2.5 to 3.0 18.1 to 21.7

Delivery hose retaining nut 34.3 to 44.1 3.5 to 4.5 25.3 to 32.5

Delivery hose joint screw 45.1 to 53.0 4.60 to 5.40 33.3 to 39.0

Bi-speed delivery pipe joint screw 30 to 40 3.1 to 4.0 23 to 29

Bi-speed delivery pipe retaining nut 29 to 49 3.0 to 5.0 21.7 to 36.2

Engine mounting screw and nut (M10) 48.1 to 55.9 4.9 to 5.7 35.5 to 41.2

Engine mounting nut (M12) 77.5 to 90.2 7.9 to 9.2 57.2 to 66.5

Front axle frame mounting screw (M12) 78 to 90 7.9 to 9.2 58 to 66

Clutch mounting screw 23.5 to 27.5 2.4 to 2.8 17.4 to 20.2

Muffler mounting screw 32 to 37 3.2 to 3.8 24 to 27

Rear wheel mounting screw and nut 196.1 to 225.6 20.0 to 23.0 145 to 166

Hydraulic hose PB, P and T retaining nut 30 to 40 3.1 to 4.0 23 to 29

Outer roof mounting screw 3.5 to 4.0 0.36 to 0.40 2.6 to 2.9

Cabin mounting bolt and nut 124 to 147 12.6 to15.0 91.1 to 108

1-S10

Page 90

STW34, STW37, STW40, WSM

NOTE

KiSC issued 11, 2014 A

ENGINE

Item

Dimension ×

Pitch

N·m kgf·m lbf·ft

Cylinder head cover screw M6 × 1.0 6.87 to 11.2 0.700 to 1.15 5.07 to 8.31

*Cylinder head screw M11 × 1.25 93.2 to 98.0 9.50 to 10.0 68.8 to 72.3

*Main bearing case screw 1 M9 × 1.25 46 to 50 4.7 to 5.2 34 to 37

*Main bearing case screw 2 M10 × 1.25 69 to 73 7.0 to 7.5 51 to 54

*Flywheel screw M12 × 1.25 98.1 to 107 10.0 to 11.0 72.4 to 79.5

*Connecting rod screw M8 × 1.0 41 to 45 4.1 to 4.6 30 to 33

*Rocker arm bracket screw M8 × 1.25 24 to 27 2.4 to 2.8 18 to 20

*Idle gear shaft screw M8 × 1.25 24 to 27 2.4 to 2.8 18 to 20

Fan drive pulley mounting nut M30 × 1.5 138 to 156 14.0 to 16.0 102 to 115

*Bearing case cover mounting screw M8 × 1.25 24 to 27 2.4 to 2.8 18 to 20

Glow plug M10 × 1.25 20 to 24 2.0 to 2.5 15 to 18

Nozzle holder assembly M20 × 1.5 49 to 68 5.0 to 7.0 37 to 50

Nozzle holder – 35 to 39 3.5 to 4.0 26 to 28

Oil pressure switch R1/8 15 to 19 1.5 to 2.0 11 to 14

Injection pipe retaining nut M12 × 1.5 25 to 34 2.5 to 3.5 18 to 25

Overflow pipe assembly retaining nut M12 × 1.5 20 to 24 2.0 to 2.5 15 to 18

Camshaft set screw M8 × 1.25 24 to 27 2.4 to 2.8 18 to 20

Hi-idling body M14 × 1.0 45 to 49 4.5 to 5.0 33 to 36

• For "*" marked screws, bolts and nuts on the table, apply engine oil to their threads and seats before tightening.

• The letter "M" in Size × Pitch means that the screw, bolt or nut dimension stands for metric. The size is the nominal outside diameter in mm of the threads. The pitch is the nominal distance in mm between two threads.

9Y1211109ENS0003US0

1-S11

Page 91

STW34, STW37, STW40, WSM

NOTE

KiSC issued 11, 2014 A

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

(1) Engine Body

Compression Pressure

1. Operate the engine until it is warmed up.

2. Stop the engine and disconnect the 2P connector from the stop solenoid in order to inject fuel.

3. Remove the air cleaner, the muffler and all injection nozzles.

4. Set a compression tester (Code No. 07909-30208) with the adaptor to the nozzle hole.

5. Keep the engine stop lever at "Stop Position".

6. While cranking the engine with the starter, measure the compression pressure.

7. Repeat steps 4 through 6 for each cylinder.

8. If the measurement is below the allowable limit, apply a small amount of oil to the cylinder wall through the nozzle hole and measure the compression pressure again.

9. If the compression pressure is still less than the allowable limit, check the top clearance, valve and cylinder head.

10. If the compression pressure increases after applying oil, check the cylinder wall and piston rings.

ENGINE

• Check the compression pressure with the specified valve clearance.

• Always use a fully charged battery for performing this test.

• Variances in cylinder compression values should be under 10 %.

Compression pressure

Factory specification

Allowable limit

3.6 to 4.0 MPa 36 to 41 kgf/cm 520 to 580 psi

2.5 MPa 26 kgf/cm 370 psi

9Y1211109ENS0004US0

1-S12

Page 92

STW34, STW37, STW40, WSM

NOTE

KiSC issued 11, 2014 A

ENGINE

Top Clearance

1. Remove the cylinder head.

2. Move the piston and stick a strip of fuse on the piston head at three positions with grease.

3. Lower the piston and install the cylinder head. (Use a new cylinder head gasket and tighten with a specified tightening torque.)

4. Turn the flywheel until the piston passes through the T.D.C..

5. Remove the cylinder head and measure the thickness of the fuses.

6. If the measurement is not within the factory specifications, check the oil clearance between the crankpin and bearing and between the piston pin and bushing.

• After checking the top clearance, be sure to assemble the cylinder head with a new cylinder head gasket.

Top clearance Factory specification

Tightening torque Cylinder head screws

0.55 to 0.70 mm

0.022 to 0.027 in.

93.2 to 98.0 N·m

9.50 to 10.0 kgf·m

68.8 to 72.3 lbf·ft

(1) Piston (2) Fuse

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IMPORTANT

NOTE

KiSC issued 11, 2014 A

ENGINE

Valve Clearance

• The valve clearance must be checked and adjusted when engine is cold.

1. Remove the head cover.

2. Remove the cap of the timing window (4) on the housing under the right step.

3. Align the "TC" mark line (3) on the flywheel and projection (2) on the housing so that the No. 1 piston comes to compression or overlap top dead center.

4. Check the following valve clearance (1) marked with "" using a feeler gauge.

5. If the clearance is not within the factory specifications, adjust with the adjusting screw.

• The "TC" marking line on the flywheel is just for No. 1 cylinder. There is no "TC" marking for the other cylinders.

• No. 1 piston comes to the top dead center position when the "TC" marking is aligned with the projection (2) in the window on clutch housing. Turn the flywheel 0.26 rad (15 °) clockwise and counterclockwise to see if the piston is at the compression top dead center or the overlap position. Now referring to the table below, readjust the valve clearance (1). (The piston is at the top dead center when both the IN. and EX. valves do not movie. It is at the overlap position when both the valves move.)

• Finally turn the flywheel 6.28 rad (360 °) and align the "TC" marking and the projection (2) perfectly. Adjust all the other valve clearance as required.

• After turning the flywheel counterclockwise twice or three times, recheck the valve clearance (1).

• After adjusting the valve clearance (1), firmly tighten the lock nut of the adjusting screw.

Adjustable cylinder and location of piston

When No. 1 piston is at compression top dead center

When No. 1 piston is at overlap position

No. 1 

No. 2 – 

No. 3 – –

No. 1 – –

No. 2  –

No. 3 – 

Valve arrangement

IN. EX.

(1) Valve Clearance (2) Projection

1-S14

(3) TC Mark Line (4) Timing Window

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KiSC issued 11, 2014 A

(2) Lubricating System

ENGINE

Engine Oil Pressure

1. Remove the engine oil pressure switch, and set an oil pressure tester (Code No. 07916-32032). (Adaptor screw size: PT 1/8)

2. Start the engine. After warming up, measure the oil pressure of both idling and rated speeds.

3. If the oil pressure is less than the allowable limit, check the following.

• Engine oil insufficient

• Oil pump damaged

• Oil strainer clogged

• Oil filter cartridge clogged

• Oil gallery clogged

• Excessive oil clearance

• Foreign matter in the relief valve

More than 98 kPa

1.0 kgf/cm 14 psi

50 kPa

0.5 kgf/cm 7 psi

300 to 440 kPa

3.0 to 4.5 kgf/cm 43 to 64 psi

250 kPa

2.5 kgf/cm 36 psi

Engine oil pressure

At idle speed

At rated speed

Factory specification

Allowable limit

Factory specification

Allowable limit

(3) Cooling System

(When reassembling)

• After checking the engine oil pressure, tighten the engine oil pressure switch to the specified torque.

15 to 19 N·m

Tightening torque Oil pressure switch

1.5 to 2.0 kgf·m 11 to 14 lbf·ft

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Fan Belt Tension

1. Measure the deflection (A), depressing the belt halfway between the fan drive pulley and alternator pulley at specified force (98 N, 10 kgf, 22 lbf).

2. If the measurement is not within the factory specifications, loosen the alternator mounting screws and relocate the alternator to adjust.

Deflection (A) Factory specification

(A) Deflection

10 to 12 mm

0.40 to 0.47 in.

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CAUTION

KiSC issued 11, 2014 A

ENGINE

Fan Belt Damage and Wear

1. Check the fan belt for damage.

2. If the fan belt is damaged, replace it.

3. Check if the fan belt is worn and sunk in the pulley groove.

4. If the fan belt is nearly worn out and deeply sunk in the pulley groove, replace it.

(A) Good (B) Bad

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Radiator Cap Air Leakage

• When removing the radiator cap, wait at least ten minutes after the engine has stopped and cooled down. Otherwise, hot water way gush out, scalding nearby people.

1. Set a radiator tester (Code No. 07909-31551) and an adapter (BANZAI Code No. RCT-2A-30S) on the radiator cap.

2. Apply the specified pressure 88 kPa (0.9 kgf/cm

, 13 psi), and measure the time for the pressure to fall to 59 kPa (0.6 kgf/cm 9 psi).

3. If the measurement is less than the factory specification, replace the radiator cap.

More than 10 seconds for pressure fall from

Pressure falling time Factory specification

90 to 60 kPa (from 0.9 to 0.6 kgf/cm from 10 to 9 psi)

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Radiator Water Leakage

1. Pour a specified amount of water into the radiator.

2. Set a radiator tester (Code No. 07909-31551) with an adaptor (BANZAI Code No. RCT-2A-30S) and raise the water pressure to the specified pressure.

3. Check the radiator for water leaks.

4. For water leak from the pinhole, replace the radiator or repair with the radiator cement. When water leak is excessive, replace the radiator.

No leaks at Radiator water leakage test pressure

Factory specification

137 kPa

1.4 kgf/cm

20 psi

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KiSC issued 11, 2014 A

ENGINE

Thermostat Valve Opening Temperature

1. Suspend the thermostat in the water by a string with its end inserted between the valve and seat.

2. Heat the water gradually and read the temperature when the valve opens and leaves the string.

3. Continue heating and read the temperature when the valve opens approx. 6 mm (0.236 in.).

4. If the measurement is not within the factory specifications, replace the thermostat.

Thermostat's valve opening temperature

Temperature at which thermostat completely opens

Factory specification

69.5 to 72.5 °C

157.1 to 162.5 °F

85 °C 185 °F

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NOTE

KiSC issued 11, 2014 A

(4) Fuel System

ENGINE

Injection Timing

1. Remove the stop solenoid.

2. Remove the injection pipes and nozzle.

3. Remove the cap of the timing window (2) on the housing under the right step.

4. Set the speed control lever to maximum fuel discharge position.

5. Turn the flywheel counterclockwise (facing the flywheel) until the fuel fills up to the hole of the delivery valve holder (1) for 1st cylinder.

6. Turn the flywheel further and stop turning when the fuel begins to flow over, to get the present injection timing.

7. (The flywheel has mark 1TC and four lines indicating every

0.087 rad (5 °) of crank angle from 0.175 rad (10 °) to 0.436 rad (25 °) before mark 1TC) Calculate the angle which the center of the window points out.

8. If the calculation differs from specified injection timing, change, add or remove the shim (6) to adjust.

Injection timing Factory specification

0.297 to 0.331 rad (17 to 19 °) before T.D.C.

• The sealant is applied to both sides of the soft metal gasket shim. The liquid gasket is not required for assembling.

• Shims are available in thickness of 0.20 mm (0.0079 in.),

0.25 mm (0.0098 in.) and 0.30 mm (0.0118 in.). Combine these shims for adjustments.

• Injection timing delays or advances by approx. 0.0087 rad (0.5 °), when the thickness of the shim is increased or decreased by 0.05 mm (0.002 in.).

• In disassembling and replacing, be sure to use the same number of new shims with the same thickness.

(1) Delivery Valve Holder (2) Timing Window (3) Two-holes: 0.20 mm (0.0079 in.)

(4) One-hole: 0.25 mm (0.0098 in.) (5) Without hole: 0.30 mm (0.0118 in.) (6) Soft Metal Gasket Shim

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CAUTION

KiSC issued 11, 2014 A

ENGINE

• Check the injection pressure and condition after making sure that there is nobody standing in the direction the fume goes.

• If the fume from the nozzle directly contacts the human body, cells may be destroyed and blood poisoning may be caused.

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Nozzle Spraying Condition

1. Set the injection nozzle to a nozzle tester, and check the nozzle spraying condition.

2. If the spraying condition is damaged, replace the nozzle piece.

(a) Good (b) Bad

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Fuel Injection Pressure

1. Set the injection nozzle to a nozzle tester.

2. Slowly move the tester handle to measure the pressure at which fuel begins jetting out from the nozzle.

3. If the measurement is not within the factory specifications, replace the adjusting washer (1) in the nozzle holder to adjust it.

Fuel injection pressure Factory specification

13.8 to 14.7 MPa 140 to 150 kgf/cm 2000 to 2130 psi

(Reference)

• Pressure variation with 0.01 mm (0.0004 in.) difference of adjusting washer thickness. Approx. 235 kPa (2.4 kgf/cm

(1) Adjusting Washer

, 34 psi)

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Valve Seat Tightness

1. Set the injection nozzle to a nozzle tester.

2. Raise the fuel pressure, and keep at 12.75 MPa (130 kgf/cm 1849 psi) for 10 seconds.

3. If any fuel leak is found, replace the nozzle piece.

No fuel leak at

Injection pressure Factory specification

12.7 MPa 130 kgf/cm 1850 psi

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IMPORTANT

WARNING

KiSC issued 11, 2014 A

[2] PREPARATION

(1) Separating Engine from Tractor for ROPS

Draining Engine Oil

1. Place an oil pan underneath the engine.

2. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1).

3. Remove the bolt from each of the side covers (2) and remove the side covers (2).

4. To drain the oil, remove the both drain plugs (4) at the bottom of the engine and drain the oil completely into the oil pan.

5. After draining, reinstall the both drain plugs (4).

(When reassembling)

• Fill with the new engine oil up to the upper notch on the dipstick (6).

• When using an oil of different manufacture or viscosity from the previous one, remove all of the old oil.

• Never mix two different types of oil.

• Use the proper SAE Engine Oil according to ambient temperatures.

• Refer to "4. LUBRICANTS, FUEL AND COOLANT" on page G-8.

Engine Oil Capacity

STW34

STW37, STW40

ENGINE

5.7 L

6.0 U.S.qts

5.0 Imp.qts

6.7 L

7.1 U.S.qts

5.9 Imp.qts

(1) Hood (2) Side Cover (3) Release Lever (4) Drain Plug

(5) Oil Inlet (6) Dipstick

A: Oil level is acceptable within this

range.

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Draining Coolant

To avoid personal injury or death:

• Do not remove the radiator cap while coolant is hot. When cool, slowly rotate cap to the first stop and allow sufficient time for express pressure to escape before removing the cap completely.

1. Stop the engine and let it cool down.

2. To drain the coolant, open the radiator drain plug (2) and remove radiator cap (1). The radiator cap (1) must be removed to completely drain the coolant.

3. After all coolant is drained, reinstall the drain plug (2).

Coolant (with recovery tank)

(1) Radiator Cap (2) Drain Plug

Capacity

(3) Recovery Tank

6.6 L

7.0 U.S.qts

5.8 Imp.qts

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IMPORTANT

NOTE

KiSC issued 11, 2014 A

ENGINE

Draining Transmission Fluid

1. Place an oil pan underneath the transmission case, and remove the drain plugs (1).

2. Drain the transmission fluid.

3. Reinstall the drain plugs (1).

(When reassembling)

• Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).

• After operating the engine for few minutes, stop it and check the oil level again, if low, add oil prescribed level.

• Use only KUBOTA SUPER UDT fluid. Use of other oils may damage the transmission or hydraulic system. Refer to "4. LUBRICANTS, FUEL AND COOLANT" on page G-8

• Never work the tractor immediately after changing the transmission oil. Keeping the engine at medium speed for a few minutes to prevents damage to the transmission.

• Do not mix different brands oil together.

Transmission fluid Capacity

24 L

6.3 U.S.gals

5.3 Imp.gals

(1) Drain Plug (2) Filling Plug

(3) Dipstick

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Hood, Side Cover and Battery Cord

1. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1).

2. Remove the bolt from each of the side covers and remove the side covers (2).

3. Disconnect the battery negative cable (4).

4. Disconnect the head light connector (5) and damper (7).

5. Remove the two screws (6), and then remove the hood (1).

(When reassembling)

• When disconnecting the battery cords, disconnect the grounding cord first. When connecting, positive cord first.

(1) Hood (2) Side Cover (3) Release Lever (4) Battery Negative Cable

(5) Head Light Connector (6) Screw (7) Damper

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