wsm B2420 Workshop Manual

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Page 1

WORKSHOP MANUAL

KiSC issued 06, 2012 A

TRACTOR

B2420

Page 2

TO THE READER

KiSC issued 06, 2012 A

This Workshop Manual tells the servicing personnel about the mechanism, servicing and

maintenance of the B2420. It contains 4 parts: "Information", "General", "Mechanism" and "Servicing".

Q Information

This section contains information below.

• Safety First

• Safety Decal

• Specification

• Dimension

Q General

This section contains information below.

• Engine Identification

• Model Identification

• General Precautions

• Maintenance Check List

• Check and Maintenance

• Special Tools

Q 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.

Q Servicing

This section 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.

February, 2010

Page 3

I INFORMATION

KiSC issued 06, 2012 A

Page 4

INFORMATION

KiSC issued 06, 2012 A

CONTENTS

1. SAFETY FIRST .............................................................................................................................. I-1

2. SAFETY DECALS .......................................................................................................................... I-4

3. SPECIFICATIONS.......................................................................................................................... I-6

4. TRAVELING SPEEDS.................................................................................................................... I-7

5. DIMENSIONS ................................................................................................................................. I-8

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B2420, WSM

SAFETY FIRST

DANGER

WARNING

CAUTION

IMPORTANT

NOTE

KiSC issued 06, 2012 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 attempt 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.

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START SAFELY

• Do not do the procedures below when you start the engine. – short across starter terminals – bypass the safety start switch

• Do not alter or remove any part of machine safety system.

• Before you start the engine, make sure that all shift levers are in neutral positions or in disengaged positions.

• Do not start the engine when you stay on the ground. Start the engine only from operator's seat.

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B2420, WSM

KiSC issued 06, 2012 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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B2420, WSM

KiSC issued 06, 2012 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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B2420, WSM

KiSC issued 06, 2012 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.

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9Y1210436INI0008US0

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B2420, WSM

KiSC issued 06, 2012 A

INFORMATION

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 replace with new part, make sure new label(s) is (are) attached in the same locations(s) as the replace component.

5. Mount new pictorial safety labels by applying on a clean dry surface and pressure any bubbles to outside edge.

9Y1210436INI0009US0

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B2420, WSM

NOTE

KiSC issued 06, 2012 A

3. SPECIFICATIONS

Model B2420

PTO power* 14.3 kW (19.4 HP)*

Maker KUBOTA

Model D1105-D22I

Type E-TVCS, liquid-cooled, 3-cylinder diesel

Number of cylinder 3

Engine

Capacities

Dimensions

Weight 722 to 748 kg (1600 to 1640 lbs)

Clutch Dry single plate

Travelling system

Hydraulic unit

PTO system Rear PTO

Bore and stroke 78.0 × 78.4 mm (3.07 × 3.09 in.)

Total displacement 1123 cm

Engine gross power* 17.9 kW (24.0 HP)*

Rated revolution 2600 min

Maximum torque 70 N·m (52 Ibf·ft)

Battery 55B24L(S)-MF

Fuel tank 26 L (6.9 U.S.gals, 5.7 Imp.gals)

Engine crankcase (with filter)

Engine coolant 3.9 L (4.1 U.S.qts, 3.4 Imp.qts)

Transmission case 14 L (3.7 U.S.gals, 3.1 Imp.gals)

Overall length (with 3P) 2410 mm (94.88 in.)

Overall width 990 to 1331 mm (39.0 to 52.40 in.)

Overall height (Top of ROPS)

Wheel base 1563 mm (61.54 in.)

Minimum ground clearance 267 to 313 mm (10.6 to 12.3 in.)

Tread

Tires

Steering Integral type power steering

Transmission Gear shift, 9 forward and 3 reverse

Brake Wet disk type

Min. turning radius (with brake)

Hydraulic control system Quarter inching valve

Pump capacity

3-point hitch SAE Category 1

Max. lift force

Rear mount ROPS type

Mid mount ROPS type

Front 797 to 815 mm (31.4 to 32.0 in.)

Rear 734 to 1088 mm (28.9 to 42.83 in.)

Front 6-12

Rear 9.5-16

3P: 16.6 L / min (4.39 U.S.gals / min, 3.65 Imp.gals / min)

Power steering: 9.8 L / min (2.6 U.S.gals / min., 2.2 Imp.gals / min)

At lift points 615 kg (1360 lbs)

600 mm behind lift point

Shaft SAE 1-3/8, 6 splines

PTO / Engine speed rpm

540 min

-1

(rpm) at 2600 min-1 (rpm), 960 min-1 (rpm) at 2552 min-1 (rpm)

3.1 L (3.3 U.S.qts, 2.7 Imp.qts)

2300 to 2350 mm (90.56 to 92.51 in.)

2030 to 2055 mm (79.9 to 80.9 in.)

(68.53 cu.in.)

-1

(rpm)

2.1 m (6.9 feet)

480 kg (1060 lbs)

INFORMATION

• *Manufacture's estimate The company reserves the right to change the specifications without notice.

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B2420, WSM

NOTE

KiSC issued 06, 2012 A

4. TRAVELING SPEEDS

Model B2420

Tire size (Rear) 8-16 Farm 9.5-16 Farm 9.5-18 Farm

Forward

Reverse

Range gear

shift lever

2 2 1.5 (0.93) 1.6 (0.99) 1.7 (1.1)

3 3 2.7 (1.7) 2.8 (1.7) 3.0 (1.9)

5 2 4.8 (3.0) 5.1 (3.2) 5.4 (3.4)

6 3 8.6 (5.3) 9.2 (5.7) 9.8 (6.1)

8 2 9.2 (5.7) 9.9 (6.2) 10.4 (6.46)

9 3 16.7 (10.4) 17.8 (11.1) 18.9 (11.7)

1 Low 1 1.3 (0.81) 1.4 (0.87) 1.5 (0.93)

2 Middle 2 4.2 (2.6) 4.4 (2.7) 4.7 (2.9)

3 High 3 8.0 (5.0) 8.6 (5.3) 9.1 (5.7)

Low

High

Main gear shift lever

1 1.0 (0.62) 1.1 (0.68) 1.2 (0.75)

1 3.3 (2.0) 3.6 (2.2) 3.8 (2.4)

1 6.5 (4.0) 6.9 (4.3) 7.3 (4.5)

INFORMATION

km/h (mph) km/h (mph) km/h (mph)

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

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B2420, WSM

KiSC issued 06, 2012 A

5. DIMENSIONS

INFORMATION

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G GENERAL

KiSC issued 06, 2012 A

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GENERAL

KiSC issued 06, 2012 A

CONTENTS

1. TRACTOR IDENTIFICATION ....................................................................................................... G-1

[1] MODEL NAME AND SERIAL NUMBER ................................................................................ G-1

[2] CYLINDER NUMBER ............................................................................................................. G-1

2. GENERAL PRECAUTIONS.......................................................................................................... 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] METRIC SCREWS, BOLTS AND NUTS .............................................................................. G-11

[4] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH UNC OR UNF

THREADS ............................................................................................................................ G-11

[5] PLUGS ................................................................................................................................. G-11

6. MAINTENANCE CHECK LIST ................................................................................................... G-12

7. CHECK AND MAINTENANCE ................................................................................................... G-14

[1] DAILY CHECK...................................................................................................................... G-14

[2] CHECK POINTS OF INITIAL 50 HOURS ............................................................................ G-15

[3] CHECK POINTS OF EVERY 50 HOURS ............................................................................ G-17

[4] CHECK POINTS OF EVERY 100 HOURS .......................................................................... G-20

[5] CHECK POINTS OF EVERY 200 HOURS .......................................................................... G-24

[6] CHECK POINTS OF EVERY 400 HOURS .......................................................................... G-25

[7] CHECK POINT OF EVERY 800 HOURS ............................................................................. G-27

[8] CHECK POINT OF EVERY 1500 HOURS ........................................................................... G-27

[9] CHECK POINT OF EVERY 3000 HOURS ........................................................................... G-27

[10]CHECK POINT OF 1 YEAR ................................................................................................. G-27

[11]CHECK POINTS OF EVERY 2 YEARS ............................................................................... G-28

[12]OTHERS............................................................................................................................... G-31

8. SPECIAL TOOLS ................................................................................................................

PECIAL TOOLS FOR ENGINE .......................................................................................... G-33

[1]

[2] SPECIAL TOOLS FOR TRACTOR ...................................................................................... G-39

9. TIRES ......................................................................................................................................... G-46

[1] TIRE PRESSURE................................................................................................................. G-46

[2] TREAD ADJUSTMENT ........................................................................................................ G-47

(1) Front Wheels .................................................................................................................. G-47

(2) Rear Wheels................................................................................................................... G-48

[3] TIRE LIQUID INJECTION .................................................................................................... G-49

10. IMPLEMENT LIMITATIONS ....................................................................................................... G-51

....... G-33

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B2420, WSM

KiSC issued 06, 2012 A

1. TRACTOR IDENTIFICATION

[1] MODEL NAME AND SERIAL NUMBER

When contacting your local KUBOTA distributor, always specify engine serial number, tractor serial number, ROPS serial number and hour meter reading.

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

GENERAL

(3) Engine Serial Number (4) Hour Meter

9Y1210436GEG0028US0

[2] CYLINDER NUMBER

The cylinder numbers of KUBOTA diesel engine are designated as shown in the figure.

The sequence of cylinder numbers is given as No.1, No.2 and No.3 starting from the gear case side.

9Y1210436GEG0029US0

G-1

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B2420, WSM

KiSC issued 06, 2012 A

2. GENERAL PRECAUTIONS

• 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.

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

GENERAL

(A) External Snap Ring (B) Internal Snap Ring

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B2420, WSM

IMPORTANT

KiSC issued 06, 2012 A

GENERAL

3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING

To ensure safety and prevent damage to the machine and surrounding equipment, heed 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 attempt 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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B2420, WSM

KiSC issued 06, 2012 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, take care 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, only connect battery.

(1) Cover

(Securely Install Cover)

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B2420, WSM

CAUTION

KiSC issued 06, 2012 A

[2] BATTERY

GENERAL

• Take care not to confuse positive and negative terminal posts.

• When removing battery cables, disconnect negative cable first. When installing battery cables, check for polarity and connect positive cable first.

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

• After connecting 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.

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

• Before recharging the battery, remove it from the machine.

• Before recharging, remove cell caps.

• Do recharging 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 or small capacity fuse is acceptable.

• Never use steel or 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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B2420, WSM

KiSC issued 06, 2012 A

GENERAL

• Use sandpaper to remove rust from terminals.

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

(1) Exposed Terminal (2) Deformed Terminal

(3) Sandpaper (4) Rust

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

(A) Correct (B) Incorrect

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• Make certain 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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B2420, WSM

KiSC issued 06, 2012 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

Yellow Y

(1) Wire Color (2) Stripe

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B2420, WSM

KiSC issued 06, 2012 A

GENERAL

4. LUBRICANTS, FUEL AND COOLANT

No. Place Capacity Lubricants, fuel and coolant

1 Fuel tank

Coolant

(with recovery tank)

Engine crankcase

(with filter)

4 Transmission case

5 Front axle case

Greasing No. of greasing points Capacity Type of grease

Brake pedal 1

Clutch pedal 1

5. TIGHTENING TORQUES

[1] GENERAL USE SCREWS, BOLTS AND NUTS

Screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual should be

tightened 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

167

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

4.9 to

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

WSM000001GEG0001US1

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

WSM000001GEG0002US1

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B2420, WSM

KiSC issued 06, 2012 A

[3] 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

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[4] 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

WSM000001GEG0008US1

[5] 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

WSM000001GEG0005US1

G-11

Page 26

B2420, WSM

KiSC issued 06, 2012 A

6. MAINTENANCE CHECK LIST

GENERAL

Indication on hour meter

No. Item

1 Engine oil Change +, , ,

2 Engine oil filter Replace +, , ,

3 Hydraulic oil filter Replace ,

4 Transmission fluid Change ,

5 Front axle case oil Change ,

6 Front axle pivot Adjust ,

7 Greasing – ,,,,,,,,,,,,,,

8 Engine start system Check ,,,,,,,,,,,,,,

9 Wheel nut torque Check ,,,,,,,,,,,,,,

10 Battery condition Check ,,,,,,,

Primary

Air cleaner

element

12 Fuel filter element

13 Fan belt Adjust ,,,,,,,

14 Clutch Adjust +,,,,,,,

15 Brake Adjust ,,,,,,,

16 Parking brake Adjust ,,,,,,,

17 Radiator hose and clamp

18 Fuel line

19 Intake air line

20 Engine valve clearance Adjust

Fuel injection nozzle injection

pressure

22 Injection pump Check

23 Cooling system Flush

24 Coolant Change

element

Secondary element

Clean ,,,,,,,

Replace

Check ,,,,,,,

Replace ,

Check ,,,

Replace

Check ,,,,,,,

Replace

Check ,,,

Replace

Check

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

Interval

every

200 Hr

every

200 Hr

every

400 Hr

every

400 Hr

every

400 Hr

every

400 Hr

every 50 Hr

every

100 Hr

every

100 Hr

every

1 year

every

1 year

every

100 Hr

every

400 Hr

every

100 Hr

every

100 Hr

every

100 Hr

every

200 Hr

every

2 years

every

100 Hr

every

2 years

every

200 Hr

every

2 years

every

800 Hr

every

1500 Hr

every

3000 Hr

every

2 years

every

2 years

00 Hr

Refer-

ence page

G-15

G-26

G-27

G-25

G-17

G-18

G-19

G-20 *4

G-22 *1

G-27 *2

G-27

G-22

G-27

G-23

G-16

G-

G-24

G-25

G-28

G-24

G-28

G-24

G-28

G-27

G-28

G-12

Page 27

B2420, WSM

IMPORTANT

KiSC issued 06, 2012 A

GENERAL

No. Item

25 Fuel system Bleed

26 Clutch housing water Drain G-31

27 Fuse Replace G-31

28 Light bulb Replace G-32

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

Indication on hour meter

Interval

Service

as re-

quired

Refer-

ence page

G-31

• The jobs indicated by "+" must be done after the first 50 hours of operation. *1: Air cleaner should be cleaned more often in server dusty conditions. *2: Every year or after 6 cleanings. *3: Replace only if necessary. *4: When the battery is used for less than 100 hours per year, check the fluid level annually.

9Y1210436GEG0003US0

G-13

Page 28

B2420, WSM

CAUTION

KiSC issued 06, 2012 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.

9Y1210436GEG0004US0

[1] DAILY CHECK

To prevent trouble from occurring, it is important to know the condition of the tractor. Check the following items

before starting.

Checking

• Check areas where previous trouble was experienced.

• Walk around the tractor.

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 and clean the radiator screen and grille.

7. Check the nuts of the tires are tight.

8. Check the number plate for damage and cleaner replace as necessary if equipped.

9. Care of danger, warning and caution labels.

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

• While sitting on the operator's seat

1. Check the 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 the head lights, tail lights and hazard lights. 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.

9Y1210436GEG0005US0

G-14

Page 29

B2420, WSM

CAUTION

IMPORTANT

CAUTION

IMPORTANT

KiSC issued 06, 2012 A

[2] CHECK POINTS OF INITIAL 50 HOURS

Changing Engine Oil

To avoid personal injury:

• Be sure to stop the engine and remove the key before changing the oil.

• Allow engine to cool down sufficiently, oil can be not and can burn.

1. To drain the used oil, remove the drain plugs (1) at the bottom of the engine and drain the oil completely into the oil pan.

2. After draining reinstall the drain plugs.

3. Fill with the new oil up to the upper notch on the dipstick.

4. Properly dispose of used oil.

• Never mix two different types of oil.

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

• Refer to "LUBRICANTS, FUEL AND COOLANT". (See page G-8.)

Engine oil Capacity

GENERAL

3.1 L

3.3 U.S.qts

2.7 Imp.qts

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

A: Oil level is acceptable within this

range

9Y1210436GEG0030US0

Replacing Engine Oil Filter Cartridge

To avoid personal injury:

• Be sure to stop the engine before changing engine oil filter cartridge (1).

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

1. Remove the engine oil filter cartridge (1).

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

3. Tighten the filter quickly unit 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.

5. Properly dispose of used oil.

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

(1) Engine Oil Filter Cartridge

9Y1210436GEG0031US0

G-15

Page 30

B2420, WSM

KiSC issued 06, 2012 A

GENERAL

Checking Clutch Pedal Free Travel

1. Stop the engine and remove the key.

2. Slightly depress the clutch pedal (1) and measure free travel at top of pedal stroke.

3. If adjustment is needed, loosen the lock nut (3) and turn the turnbuckle (2) to adjust the rod length within in acceptable limits.

4. Retighten the lock nut (3).

Clutch pedal free travel

"A"

Factory specification

20 to 30 mm

0.79 to 1.10 in.

(1) Clutch Pedal (2) Turnbuckle

(3) Lock Nut

9Y1210436GEG0032US0

G-16

Page 31

B2420, WSM

KiSC issued 06, 2012 A

[3] CHECK POINTS OF EVERY 50 HOURS

Greasing

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

GENERAL

(1) Grease Fitting (Brake Pedal) (2) Grease Fitting (Clutch Pedal) (3) Grease Fitting (Top Link) (4) Grease Fitting (Lift Arm)

(5) Grease Fitting (Lifting Rod, R.H.) (6) Grease Fitting (Parking Brake) (7) Parking Brake (8) Battery Terminal

9Y1210436GEG0033US0

G-17

Page 32

B2420, WSM

CAUTION

NOTE

KiSC issued 06, 2012 A

GENERAL

Checking Engine Start System (Serial Number Below 33597)

• Do not allow anyone near the tractor while testing.

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

Q Preparation before testing

1. Sit on operator's seat.

2. Set the parking brake and stop the engine.

3. Shift the main gear shift lever (2) in "NEUTRAL" position.

4. Shift the PTO gear shift lever (3) to "NEUTRAL" position.

5. Fully depress the clutch pedal (1).

Q Test: Switch for the main gear shift lever (2).

1. Fully depress the clutch pedal (1).

2. Shift the main gear shift lever (2) to "Desired" position.

3. Turn the key to "START" position.

4. The engine must not crank.

Q Test: Switch for the PTO gear shift lever (3).

1. Fully depress the clutch pedal (1).

2. Shift the main gear shift lever (2) to "NEUTRAL" position.

3. Shift the PTO gear shift lever (3) to "ON" (Engaged) position.

4. Turn the key to "START" position.

5. The engine must not crank.

• If the engine cranks during any of these tests, adjust or replace the required safety switch.

(1) Clutch Pedal (2) Main Gear Shift Lever

(3) PTO Gear Shift Lever

9Y1210436GEG0006US0

G-18

Page 33

B2420, WSM

CAUTION

KiSC issued 06, 2012 A

GENERAL

Checking Engine Start System (Serial Number Above 33598)

To avoid personal injury:

• Do not allow anyone near the tractor while testing.

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

Q Preparation before testing

1. Sit on operator's seat.

2. Set the parking brake and stop the engine.

3. Shift the main gear shift lever (2) in "NEUTRAL" position.

4. Shift the PTO gear shift lever (3) to "NEUTRAL" position.

5. Fully depress the clutch pedal (1).

Q Test: Switch for the main gear shift lever (2).

1. Fully depress the clutch pedal (1).

2. Shift the main gear shift lever (2) to "Desired" position.

3. Turn the key to "START" position.

4. The engine must not crank.

Q Test: Switch for the PTO gear shift lever (3).

1. Fully depress the clutch pedal (1).

2. Shift the main gear shift lever (2) to "NEUTRAL" position.

3. Shift the PTO gear shift lever (3) to "ON" (Engaged) position.

4. Turn the key to "START" position.

5. The engine must not crank.

Q Test: Switch for the Operator's seat.

1. Sit on operator's seat.

2. Start the engine.

3. Fully depress the clutch pedal (1).

4. Shift the PTO gear shift lever (3) to "ON" (Engaged) position.

5. Release the parking brake.

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

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

8. If it does not stop, adjust or replace the required safety switch.

(1) Clutch Pedal (2) Main Gear Shift Lever

(3) PTO Gear Shift Lever

9Y1210436GEG0068US0

Checking Wheel Mounting Bolts and Nuts Tightening Torque

• 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 wheel bolts and nuts regularly especially when new. If there are loosened, tighten as follows.

Front wheel mounting nut

Tightening torque

(1) Front Wheel Mounting Nut (2) Cotter Setting Bolt and Nut (3) Rear Wheel Hub Mounting Nut

Cotter setting bolt and nut

Rear wheel mounting nut

A: Front B: Rear

77 to 90 N·m

7.9 to 9.2 kgf·m 57 to 66 lbf·ft

123 to 147 N·m

12.6 to 15.0 kgf·m

90.8 to 108 lbf·ft

108 to 125 N·m

11.0 to 12.8 kgf·m

79.7 to 92.1 lbf·ft

9Y1210436GEG0007US0

G-19

Page 34

B2420, WSM

DANGER

CAUTION

KiSC issued 06, 2012 A

[4] CHECK POINTS OF EVERY 100 HOURS

Adjusting Clutch Pedal Free Travel

1. See page G-16.

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.

• Never remove the vent plugs 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.

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

1. Mishandling the battery shortens the service life and adds to maintenance costs.

2. The original battery is maintenance free type battery, but need some servicing.

3. If the battery is weak, the engine is difficult to start and the lights be dim. It is important check the battery periodically.

(1) Battery (2) Vent Cap

GENERAL

9Y1210436GEG0034US0

(To be continued)

G-20

Page 35

B2420, WSM

CAUTION

KiSC issued 06, 2012 A

(Continued)

GENERAL

• 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 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. Make sure each electrolyte level is to the bottom of vent wells, if necessary add distilled water in a well-ventilated area.

2. The water in the electrolyte evaporates during recharging. Liquid shortage damages the battery. Excessive liquid spills over and damages the tractor body.

3. 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 normal manner.

4. 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.

5. When the specific gravity of electrolyte is between 1.27 and

1.29, the charging is completed.

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

Table 1

Battery

Typ e

55B24L-

Volt (V)

12 36 71 390 4.5

Capacity

at 5 H.R

Reserve at (min.)

Cold

Cranking

Amps

Normal

Charging

Rate (A)

Q Battery 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 6 months in cold seasons.

(3) Upper Level (4) Lower Level

9Y1210436GEG0035US0

G-21

Page 36

B2420, WSM

IMPORTANT

NOTE

KiSC issued 06, 2012 A

GENERAL

Cleaning Air Cleaner Element

1. Remove the air cleaner cover (3) and primary element (2).

2. Clean the primary element if: – 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).

– 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.

3. When replacing the air cleaner primary element (2), replace the secondary element (1) as well: Once a year or after every six times of cleaning, whichever comes first.

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

• Do not run the engine with filter element removed.

• Be sure to refit the dust cup with the arrow ↑ (on the rear of cup) upright. If the dust cup 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.

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

Q Evacuator Valve

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.

(1) Secondary (Safety) Element (2) Primary Element

(3) Air Cleaner Cover (4) Evacuator Valve

9Y1210436GEG0036US0

Cleaning Fuel Filter

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

1. Loosen and remove the fuel filter bowl (1), and rinse the inside with kerosene.

2. Take out the filter element (4) and dip it in the kerosene to rinse.

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

4. Bleed the fuel system. (See page G-31.)

• When the fuel filter bowl has been removed, fuel stops flowing from the fuel tank. If the fuel tank is almost full, however, the fuel will flow back from the fuel return pipe to the fuel filter. Before the above checking, mark sure the fuel tank is less than half-full.

(1) Fuel Filter Bowl (2) Filter Bracket (3) O-ring (4) Filter Element (5) O-ring

(A) Loosen (B) Tighten

9Y1210436GEG0037US0

G-22

Page 37

B2420, WSM

CAUTION

NOTE

KiSC issued 06, 2012 A

GENERAL

Adjusting 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 in 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

7.0 to 9.0 mm

Fan belt tension Factory specification

(0.28 to 0.35 in.) when the belt is pressed in the middle of the span.

(1) Adjusting Screw (2) Tension Bolt

(A) Check the belt tension (B) To Tighten

9Y1210436GEG0038US0

Adjusting Clutch Pedal

• See page G-16.

9Y1210436GEG0039US0

Adjusting Brake Pedal Free Travel

To avoid personal injury:

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

1. Release the parking brake.

2. Slightly depress the brake pedals (1) and measure free travel at top of pedal stroke.

3. If the measurement is not within the factory specifications, loosen the lock nut (2) and turn the adjust nut (3) to adjust the brake rod length.

4. Retighten the lock nut (2) securely.

5. Keep the free travel in the right and left brake pedals equal.

30 to 40 mm (1.2 to 1.5 in.)

Brake pedal free travel

"L"

Factory specification

on the pedal. Keep the free travel in the right and left brake pedals equal.

• After checking brake pedal free travel, be sure to engage the parking brake lever fully and check to see that the brake pedals are securely locked.

(1) Brake Pedal (2) Lock Nut (3) Adjust Nut (4) Brake Lever

L: Free Travel

9Y1210436GEG0040US0

G-23

Page 38

B2420, WSM

CAUTION

NOTE

KiSC issued 06, 2012 A

GENERAL

Adjusting Parking Brake

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

1. Check free travel of the parking brake pedal (1).

2. If adjustment is needed, pull the parking release lever (2) to release the parking brake, and then loosen the lock nut (3) and the adjust nut (4).

3. Adjust the adjust nut (4) to leave no space between the collar and the brake lever (5).

4. Retighten the lock nut (3).

Parking brake free travel Factory specification

1 notch (Ratchet sound 1)

(1) Parking Brake Pedal (2) Parking Release Lever (3) Lock Nut (4) Adjust Nut (5) Brake Lever

Checking Fuel Line

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

2. If fuel lines (1) and hose clamps (2) are found worn or damaged, replace or repair them at once.

• If the fuel line is removed, be sure to properly bleed the fuel system.

(1) Fuel Line (2) Hose Clamp

[5] CHECK POINTS OF EVERY 200 HOURS

Replacing Engine Oil Filter Cartridge

• See page G-15.

Checking Intake Air Line

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

2. If hoses (2) and hose clamps (1) are found worn or damaged, replace or repair them at once.

(1) Hose Clamp (2) Hose

A: PULL

9Y1210436GEG0008US0

9Y1210436GEG0041US0

9Y1210436GEG0042US0

9Y1210436GEG0043US0

G-24

Page 39

B2420, WSM

NOTE

KiSC issued 06, 2012 A

GENERAL

Checking Radiator Hose and Hose Clamp

Check to see if radiator hoses (1) 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 bands securely.

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

Q 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. Don't 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 on 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

9Y1210436GEG0044US0

[6] CHECK POINTS OF EVERY 400 HOURS

Adjusting Front Axle Pivot (Front Axle Rocking Force)

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

vibration can occur causing vibration in the steering wheel

1. Jack up the front side of tractor.

2. Set a spring balance to the front axle flange.

3. Measure the front axle rocking force.

• When adjusting the locking force, apply liquid gasket (Three Bond 1206D or equivalent) to the thread part of an adjusting screw.

4. If the measurement is not within the factory specifications, adjust with the adjusting screw (1).

5. Tighten the lock nut (2) firmly.

Front axle rocking force Factory specification

(1) Adjusting Screw (2) Lock Nut

50.0 to 100 N

5.10 to 10.1 kgf

11.3 to 22.4 lbf

9Y1210436GEG0045US0

G-25

Page 40

B2420, WSM

CAUTION

IMPORTANT

KiSC issued 06, 2012 A

GENERAL

Changing Transmission Fluid / Replacing Hydraulic Oil Filter

To avoid personal injury:

• 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. To drain the used oil, remove the drain plugs (1) at the bottom of the transmission case and drain the oil completely into the oil pan.

2. After draining reinstall the drain plugs (1).

3. Remove the oil filter (2).

4. Put a film of clean transmission oil on rubber seal of new oil filter (2).

5. Tighten the oil filter (2) quickly until it contacts the mounting surface. Tighten oil filter (2) by hand an additional 1/2 turn only.

6. Fill with new KUBOTA SUPER UDT fluid up to the upper notch on the dipstick (3).

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

8. After the new oil filter (2) has been replaced, the transmission fluid level will decrease a little. Make sure that the transmission fluid does not leak through the seal, and check the fluid level. Top off if necessary.

9. Properly dispose of used oil.

• If the 3-point hitch can not be raised by setting the hydraulic control lever to the UP position after long term storage or when changing the transmission oil, turn steering wheel to the right and left several times to bleed air from the system.

• Use only multi-grade transmission oil. Use of other oils may damage the transmission or hydraulic system. Refer to "LUBRICANTS, AND FLUID" (See 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

(1) Drain Plugs (Both sides) (2) Oil Filter (3) Filling Plug (4) Dipstick

A: Oil level is acceptable within this

14 L

3.7 U.S.gals

3.1 lmp.gals

range.

9Y1210436GEG0046US0

G-26

Page 41

B2420, WSM

IMPORTANT

KiSC issued 06, 2012 A

GENERAL

Changing Front Axle Case Oil

1. Place the oil pans underneath the front axle case.

2. Remove the both right and left hand side drain plugs (2) and filling plug (1) to drain the oil.

3. After draining, reinstall the drain plugs (2).

4. Fill with new oil up to the upper notch on the dipstick.

• After ten minutes, check the oil level again, add oil to prescribed level.

• Use KUBOTA SUPER UDT fluid or SAE 80, 90 gear oil. Refer to "LUBRICANTS, FUEL AND COOLANT". (See page G-8.)

Front axle case Capacity

3.2 L

3.4 U.S.qts

2.8 Imp.qts

(1) Filling Plug with Dipstick (2) Drain Plug

Replacing Fuel Filter Element

1. The fuel filter element should be replaced every 400 hours.

(1) Filter Bracket (2) Fuel Filter Bowl (3) O-ring

[7] CHECK POINT OF EVERY 800 HOURS

Checking Valve Clearance

• See page 1-S11.

[8] CHECK POINT OF EVERY 1500 HOURS

Checking Fuel Injection Nozzle Injection Pressure

• See page 1-S17.

A: Oil Level is acceptable within this

range.

9Y1210436GEG0047US0

(4) Filter Element (5) O-ring

9Y1210436GEG0048US0

9Y1210436GEG0009US0

9Y1210436GEG0010US0

[9] CHECK POINT OF EVERY 3000 HOURS

[10] CHECK POINT OF 1 YEAR

Checking Injection Pump

• See page 1-S16.

9Y1210436GEG0011US0

Replacing Air Cleaner Primary Element and Secondary Element

• See page G-22.

9Y1210436GEG0012US0

G-27

Page 42

B2420, WSM

CAUTION

IMPORTANT

KiSC issued 06, 2012 A

[11] CHECK POINTS OF EVERY 2 YEARS

Replacing Fuel Hoses

• See page G-24.

Replacing Intake Air Hoses

• See page G-24.

Replacing Radiator Hoses

• See page G-25.

Flushing Cooling System and Changing Coolant

To avoid personal injury:

• Do not remove the radiator cap (1) 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 cock (2) and remove the radiator cap (1). The radiator cap (1) must be removed to completely drain the coolant.

3. After all coolant is drained, close the drain cock (2).

4. Fill with clean water and cooling system cleaner.

5. Follow directions of the cleaner instruction.

6. After flushing, fill with clean water and anti-freeze until the coolant level is just below the radiator cap (1). Install the radiator cap (1) securely.

7. Fill with coolant up to the "FULL" mark on the recovery tank (3).

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 (3) and add coolant if necessary.

11. Properly dispose of used coolant.

GENERAL

9Y1210436GEG0049US0

9Y1210436GEG0050US0

9Y1210436GEG0051US0

• Do not start engine without coolant.

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

• When the anti-freeze is mixed with water, the anti-freeze mixing ratio must be less than 50 %.

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

Coolant (with recover tank)

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

Capacity

(A) FULL (B) LOW

3.9 L

4.1 U.S.qts

3.4 Imp.qts

(To be continued)

G-28

Page 43

B2420, WSM

CAUTION

KiSC issued 06, 2012 A

(Continued)

GENERAL

Q Anti-Freeze

To avoid personal injury:

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

• If should drink antifreeze, throw up at once and take medical attention.

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

• Do not mix different type 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.

If it freezes, coolant can damage the cylinders and radiator. If

the ambient temperature falls below 0 °C (32 °F) or before a long-term storage, let out cooling water completely, or mix fresh water with long-life coolant and fill the radiator and reserve tank with the mixture.

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 Put the LLC in cooling water in the percentage (%) for a target temperature. 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.

(To be continued)

G-29

Page 44

B2420, WSM

IMPORTANT

NOTE

KiSC issued 06, 2012 A

(Continued)

GENERAL

• When the antifreeze is mixed with water, the antifreeze mixing ratio must be less than 50 %.

Vol %

Anti-freeze

40 −24 −12 106 222

50 −37 −34 108 226

*At 1.013 × 105Pa (760 mmHg) pressure (atmospheric). A higher boiling points 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

5. Adding the LLC – Add only water if the mixture reduces in amount by

evaporation.

– If there is a mixture leak, add the LLC of the same

manufacture and type in the same mixture percentage. *Never add any long-life coolant of different manufacture. (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.

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

• When the coolant level drops due to evaporation, add water only to keep the antifreeze mixing ratio less than 50 %. In case of leakage, add antifreeze and water in the specified mixing ratio before filling in to the radiator.

9Y1210436GEG0013US0

G-30

Page 45

B2420, WSM

NOTE

KiSC issued 06, 2012 A

[12] OTHERS

GENERAL

Bleeding Fuel System

Air must be removed:

1. When the fuel filter or lines are removed.

2. When the tank is completely empty.

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

Bleeding procedure is as follows.

1. Fill the fuel tank with fuel.

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

9Y1210436GEG0052US0

Draining Clutch Housing Water

• The tractor is equipped with a 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 drain plug (1) and drain the water, then install the drain plug (1) again.

(1) Drain Plug

9Y1210436GEG0053US0

Replacing Fuse (Serial Number Below 33597)

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 the "TROUBLESHOOTING" section of this manual.

Q Protected Circuit

Fuse No. Capacity (A)

(1) 10

(2) 20 Work light

(3) 10 Brake

(4) 25

(5) 5 Key stop

(6) 15 Hazard

(7) Slow blow fuse

Flasher Panel Alternator

Head Light Horn

Check circuit against wrong battery connection

9Y1210436GEG0054US0

G-31

Page 46

B2420, WSM

IMPORTANT

KiSC issued 06, 2012 A

GENERAL

Replacing Fuse (Serial Number Above 33598)

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.

Q Protected Circuit

Fuse No. Capacity (A) Protected circuit

(1) 15 Hazard

(2) 30 Key stop

(3) 25

(4) 10 Brake

(5) 20 Auxiliary (Reserve)

(6) 10 Instrument Cluster

(7) Slow blow fuse

Head Light, Horn, Key stop

Check circuit against wrong battery connection

9Y1210436GEG0069US0

Replacing Light Bulb

1. Head lights: Take the bulb out of the light body and replace with a new one.

2. Other lights: Detach the lens and replace the bulb.

(When reassembling)

• When assembling the head light bulbs, apply liquid gasket (Three Bond 1521 or equivalent) to joint face of the head light and rubber.

Light Capacity

Head lights 45 / 40 W

Tail light 5 W

Turn signal / Hazard light 21 W

Instrument panel light 1.7 W

Hazard light switch indicator 0.6 W

Brake stop lights 21 W

Front position light 5 W

Number plate light 5 W

(1) Head Light (2) Front Turn Signal / Hazard Light (3) Front Position Light (4) Tail Light (5) Rear Turn Signal / Hazard Light

G-32

(6) Brake Stop Light (7) Number Plate Light (8) Easy Checker™ (9) Hazard Light Switch Indictor

9Y1210436GEG0055US0

Page 47

B2420, WSM

KiSC issued 06, 2012 A

8. SPECIAL TOOLS

[1] SPECIAL TOOLS FOR ENGINE

Special Use Puller Set

Code No.

• 07916-09032

Application

• Use exclusively for pulling out bearing, gears and other parts with ease.

Piston Ring Compressor

Code No.

• 07909-32111

Application

• Use exclusively for pushing in the piston with piston rings into the cylinder.

GENERAL

WSM000001GEG0011US0

WSM000001GEG0012US0

Piston Ring Tool

Code No.

• 07909-32121

Application

• Use exclusively for removing or installing 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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KiSC issued 06, 2012 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-34

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B2420, WSM

KiSC issued 06, 2012 A

GENERAL

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

Flywheel Puller

Code No.

• 07916-32011

Application

• Use exclusively for removing the flywheel with ease.

WSM000001GEG0018US0

G-35

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B2420, WSM

NOTE

KiSC issued 06, 2012 A

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

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 PF 1/2

C Copper gasket

D Flange (Material: Steel)

E Hex. nut 27 mm (1.1 in.) across the plat

F Adhesive application

G Fillet welding on the enter circumference

H Retaining nut

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

J 8.0 mm dia. (0.31 in. dia.)

K 1.0 mm (0.039 in.)

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

M 6.10 to 6.20 mm dia. (0.241 to 0.244 in. dia.)

N 8.0 mm (0.31 in.)

O 4.0 mm (0.16 in.)

P 11.97 to 11.99 mm dia. (0.4713 to 0.4720 in. dia.)

Q PF 1/2

R 23 mm (0.91 in.)

S 17 mm (0.67 in.)

T 4.0 mm (0.16 in.)

U 12.00 to 12.02 mm dia. (0.4725 to 0.4732 in. dia.)

V 100 mm (3.94 in.)

W M12 × P1.5

X 5.0 mm (0.20 in.)

, 4267 psi)

GENERAL

WSM000001GEG0026US0

9Y1210436GEG0014US0

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B2420, WSM

KiSC issued 06, 2012 A

GENERAL

Valve Guide Replacing Tool

Application

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

A 225 mm (8.86 in.)

B 70 mm (2.8 in.)

C 45 mm (1.8 in.)

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

E 11.7 to 11.9 mm dia. (0.461 to 0.468 in. dia.)

F 6.50 to 6.60 mm dia. (0.256 to 0.259 in. dia.)

G 25 mm (0.98 in.)

H 6.70 to 7.00 mm dia. (0.264 to 0.275 in. dia.)

I 5.0 mm (0.20 in.)

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

K 12.5 to 12.8 mm dia. (0.493 to 0.503 in. dia.)

L 8.90 to 9.10 mm (0.351 to 0.358 in.)

C1 Chamfer 1.0 mm (0.039 in.)

C2 Chamfer 2.0 mm (0.079 in.)

C0.3 Chamfer 0.30 mm (0.012 in.)

9Y1210436GEG0015US0

Crankshaft Bearing 1 Replacing Tool

Application

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

[Press Out]

A 135 mm (5.31 in.)

B 72 mm (2.8 in.)

C 40 mm radius (1.6 in. radius)

D 10 mm (0.39 in.)

E 24 mm (0.94 in.)

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

G 51.20 to 51.40 mm dia. (2.016 to 2.023 in. dia.)

H 47.30 to 47.50 mm dia. (1.863 to 1.870 in. dia.)

C1 Chamfer 1.0 mm (0.039 in.)

C2 Chamfer 2.0 mm (0.079 in.)

C0.3 Chamfer 0.30 mm (0.012 in.)

[Press In]

A 135 mm (5.31 in.)

B 72 mm (2.8 in.)

C 40 mm radius (1.6 in. radius)

D 10 mm (0.39 in.)

E 24 mm (0.94 in.)

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

G 68 mm dia. (2.7 in. dia.)

H 47.30 to 47.50 mm dia. (1.863 to 1.870 in. dia.)

C1 Chamfer 1.0 mm (0.039 in.)

C2 Chamfer 2.0 mm (0.079 in.)

C0.3 Chamfer 0.30 mm (0.012 in.)

9Y1210436GEG0016US0

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KiSC issued 06, 2012 A

GENERAL

Bushing Replacing Tool

Application

• Use to press out and press in the bushing.

1. For small end bushing

A 157 mm (6.18 in.)

B 24 mm (0.94 in.)

C 120 mm (4.72 in.)

D 21.8 to 21.9 mm dia. (0.859 to 0.862 in. dia.)

E 24.8 to 24.9 mm dia. (0.977 to 0.980 in. dia.)

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

a 6.3 µm (250 µin.)

b 6.3 µm (250 µin.)

2. For idle gear bushing

A 196 mm (7.72 in.)

B 26 mm (1.0 in.)

C 150 mm (5.91 in.)

D 25.80 to 25.90 mm dia. (1.016 to 1.019 in. dia.)

E 28.80 to 28.90 mm dia. (1.134 to 1.137 in. dia.)

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

a 6.3 µm (250 µin.)

b 6.3 µm (250 µin.)

9Y1210436GEG0017US0

Flywheel Stopper

Application

• Use to loosen and tighten the flywheel screw.

A 20 mm (0.79 in.)

B 15 mm (0.59 in.)

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

D 30 mm (1.2 in.)

E 8.0 mm (0.31 in.)

F 200 mm (7.87 in.)

9Y1210436GEG0018US0

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B2420, WSM

KiSC issued 06, 2012 A

[2] SPECIAL TOOLS FOR TRACTOR

Tie-rod End Lifter

Code No.

• 07909-39051

Application

• Use for removing the tie-rod end with ease.

Steering Wheel Puller

Code No.

• 07916-51090

Application

• Use for removing the steering wheel without damaging the steering shaft.

GENERAL

WSM000001GEG0029US0

WSM000001GEG0030US0

Pitman Arm Puller

Code No.

• 07909-39051

Application

• Use for removing the tie-rod end with ease.

WSM000001GEG0050US0

Injector CH3

Code No.

• 07916-52501

Application

• Use to put calcium chloride solution into a rear wheel and to remove it.

WSM000001GEG0031US0

Toe-in Gauge

Code No.

• 07909-31681

Application

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

WSM000001GEG0034US0

G-39

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KiSC issued 06, 2012 A

GENERAL

Clutch Center Tool (For B and L Series Tractors)

Application

• The clutch center tool can be used for all B and L series tractors with a diaphragm clutch by changing tip guides. Center piece diameter is 14 mm (0.55 in.).

WSM000001GEG0033US0

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 testing 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

WSM000001GEG0037US0

G-40

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B2420, WSM

NOTE

KiSC issued 06, 2012 A

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

Bevel Gear Shaft (10T) Tool

Application

• Use for measuring and tightening the bevel gear shaft.

A 6.4 to 6.6 mm square (0.25 to 0.26 in. square)

B 17.5 mm dia. (0.689 in. dia.)

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

D 0.52 rad (30 °)

E 21 mm dia. (0.83 in. dia.)

F Involute spline (refer to below)

G Chamfer 1.0 mm (0.039 in.)

H 25 mm (0.98 in.)

I 35 mm dia. (1.4 in. dia.)

J 28 mm dia. (1.1 in. dia.)

(Involute Spline)

• INTERNAL 20 x 14 x 1.25

Coefficient of profile shifting +0.800

Tooth form Stub tooth

Tool

Number of teeth 14

Diameter of basic pitch circle 17.5 mm (0.689 in.)

Tooth thickness Between pin diameter

Module 1.250

Pressure angle 0.35 rad (20 °)

GENERAL

WSM000001GEG0026US0

15.084 to 15.155 mm (0.59386 to 0.59665 in.) (Pin diameter = 2.50 mm (0.0984 in.))

(Reference)

• This tool can be made by welding the coupling (6C050-14520) and socket wrench.

9Y1210436GEG0019US0

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NOTE

KiSC issued 06, 2012 A

Disassembling Stand

Application

• Use for supporting engine.

• This special tool is not provided, so make it referring to figure.

GENERAL

A 150 mm (5.91 in.) G 9 mm (0.4 in.) M 244 mm (9.61 in.)

B 100 mm (3.94 in.) H 110 mm (4.33 in.) N 150 mm (5.91 in.)

C 50 mm (2.0 in.) I 220 mm (8.66 in.) O 75 mm (3.0 in.)

D 7 mm (0.3 in.) J 165 mm (6.50 in.) P 75 mm (3.0 in.)

E 30 mm (1.2 in.) K 9 mm (0.4 in.) C3 Chamfer 3 mm (0.1 in.)

4 × 16 mm dia. × L30 mm

4 × 0.63 in. dia. × L1.2 in.

L 12 mm dia. (0.5 in. dia.)

9Y1210436GEG0020US0

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KiSC issued 06, 2012 A

PS Plug Wrench

Application

• Use for tightening the plug for ball nut assembling.

GENERAL

A 64 mm (2.51 in.) L 22.0 mm dia. (0.87 in. dia.)

B 48 mm (1.89 in.) M 3.2 mm dia. (0.13 in. dia.)

C 36.2 to 36.3 mm (1.425 to 1.429 in.) N 3 mm dia. (0.12 in. dia.)

D 8 mm (0.31 in.) O 12 mm (0.47 in.)

E 13 mm (0.55 in.) P 3 mm (0.12 in.)

F 8 mm (0.31 in.) Q

G 33 mm (1.30 in.) R C3: Chamfer 3 mm (0.12 in.)

H 45 mm (1.77 in.) S C3: Chamfer 3 mm (0.12 in.)

I 16 mm (0.63 in.) T R10: 10 mm radius (0.39 in. radius)

J 6 mm (0.24 in.) U C12: Chamfer 12 mm (0.47 in.)

K 12.0 to 12.1 mm dia. (0.472 to 0.476 in. dia.) V C1: Chamfer 1 mm (0.04 in.)

Pin: 6 mm dia. × 15 mm length (0.24 in. dia. × 0.59 in. length)

Bushing Replacing Tool, for 4WD front Axle Bracket (Front)

Application

• Use to press fit the bushing.

A 120 mm (4.72 in.)

B 74 mm (2.9 in.)

C 10 mm (0.39 in.)

D 16 mm (0.63 in.)

E 20 mm (0.79 in.)

F 40 mm dia. (1.57 in. dia.)

G 80 mm dia. (3.15 in. dia.)

H 55 mm dia. (2.2 in. dia.)

I 50 mm dia. (2.0 in. dia.)

9Y1210436GEG0021US0

9Y1210436GEG0056US0

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KiSC issued 06, 2012 A

GENERAL

Bushing Replacing Tool, for 4WD front Axle Bracket (Rear)

Application

• Use to press fit the bushing.

A 130 mm (5.12 in.)

B 71 mm (2.9 in.)

C 15 mm (0.59 in.)

D 14 mm (0.55 in.)

E 30 mm (1.2 in.)

F 40 mm dia. (1.57 in. dia.)

G 100 mm dia. (3.94 in. dia.)

H 70 mm dia. (2.8 in. dia.)

I 65 mm dia. (2.6 in. dia.)

9Y1210436GEG0057US0

Hydraulic Arm Shaft Bushing Press-Fitting Tool (Left)

Application

• Use for replacing the hydraulic arm shaft bushings in the hydraulic cylinder body.

A 120 mm (4.72 in.)

B 74 mm (2.9 in.)

C 10 mm (0.39 in.)

D 8 mm (0.3 in.)

E 28 mm (1.1 in.)

F 40 mm dia. (1.6 in. dia.)

G 60 mm dia. (2.4 in. dia.)

H 43.6 mm dia. (1.72 in. dia.)

I 34 mm dia. (1.3 in. dia.)

9Y1210436GEG0058US0

Hydraulic Arm Shaft Bushing Press-Fitting Tool (Right)

Application

• Use for replacing the hydraulic arm shaft bushings in the hydraulic cylinder body.

A 120 mm (4.72 in.)

B 74 mm (2.9 in.)

C 10 mm (0.39 in.)

D 8 mm (0.3 in.)

E 28 mm (1.1 in.)

F 40 mm dia. (1.6 in. dia.)

G 60 mm dia. (2.4 in. dia.)

H 43.6 mm dia. (1.72 in. dia.)

I 34 mm dia. (1.3 in. dia.)

9Y1210436GEG0059US0

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NOTE

KiSC issued 06, 2012 A

Adaptor Joint

Application

• Use for connecting the adaptor 66 to the hydraulic pump (power steering side).

• This special tool is not provided, so make it referring to figure

GENERAL

A G 1/4 H 10.5 mm dia. (0.413 in. dia.)

B 3 mm (0.1 in.) I 8 mm (0.3 in.)

C 10 mm (0.39 in.) J 10.92 to 11.05 mm dia. (0.4299 to 0.4350 in. dia.)

D 9.0 mm (0.35 in.) K 17 mm dia. (0.67 in. dia.)

E 29 mm (1.1 in.) L 6 mm dia. (0.2 in. dia.)

F HEX 16.7 to 17.0 mm (HEX 0.657 to 0.669 in.) M 25 µm (980 µin.)

G G 3/8 N 6.3 µm (250 µin.)

9Y1210436GEG0060US0

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WARNING

IMPORTANT

NOTE

KiSC issued 06, 2012 A

GENERAL

9. TIRES

[1] TIRE PRESSURE

To avoid personal injury:

• 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.

9Y1210436GEG0061US0

Inflation Pressure

Through the tire pressure is factory-set to the prescribed level,

it naturally drops slowly over the course of time.

Thus, check it regularly and inflate as necessary.

Q Recommended Inflation Pressure

• Maintain the pressure shown below for normal use.

Tire Sizes Inflation Pressure

, 23 psi)

, 20 psi)

, 29 psi)

, 23 psi)

Rear

Front

8-16, 4PR 160 kPa (1.6 kgf/cm

9.5-16, 4PR 140 kPa (1.4 kgf/cm

9.5-18, 4PR 140 kPa (1.4 kgf/cm

6-12B, 4PR 200 kPa (2.0 kgf/cm

6-12, 4PR 200 kPa (2.0 kgf/cm

185-85D12 (7-12), 4PR 160 kPa (1.6 kgf/cm

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

Q Dual Tires

• Dual tires are not approved.

(A) Insufficient (B) Standard

9Y1210436GEG0062US0

G-46

Page 61

B2420, WSM

CAUTION

IMPORTANT

KiSC issued 06, 2012 A

GENERAL

[2] TREAD ADJUSTMENT

To avoid personal injury:

• 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.

• Always attach tires as shown in the figure.

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

• Do not use tires larger than specified.

9Y1210436GEG0063US0

(1) Front Wheels

Front tread width can not be adjusted.

• Do not turn front discs to obtain wider tread.

6-12B, Farm 6-12, Farm 185-85D (7-12), Farm

Tread (a) 797 mm (31.4 in.) 796 mm (31.3 in.) 815 mm (32.1 in.)

(a) Tread

9Y1210436GEG0064US0

G-47

Page 62

B2420, WSM

IMPORTANT

NOTE

KiSC issued 06, 2012 A

GENERAL

(2) Rear Wheels

• Always attach tires as shown in the figures.

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

• When re-fitting or adjusting a wheel, tighten the bolts to the following torques then recheck after driving the tractor 200 m (200 yards) and there after daily check service.

9Y1210436GEG0023US0

Rear tread can be adjusted as shown with the standard

equipped tires.

To change the tread width

1. Loosen the nut (1) of cotter pin bolt (3).

2. Remove the snap pin (5) and wheel hub pin (4).

3. Change the tread to desired position.

4. Re-set the wheel hub pin (4) , snap pin (5) and cotter pin bolt (3).

(1) Nut (2) Spring Washer (3) Bolt

8-16 Farm 9.5-16 Farm 9.5-18 Farm

(4) Wheel Hub Pin (5) Snap Pin

734 to 964 mm

(28.9 to 37.9 in.)

A: Tread

790 to 1068 mm

(31.1 to 42.04 in.)

806 to 1088 mm

(31.8 to 42.83 in.)

9Y1210436GEG0022US0

• Insert the bolt (2) from the recessed side of both cotters and tighten the nut (4) with flat side of cotter as shown in figure.

(1) Cotter (2) Bolt

(3) Spring Lock Washer (4) Nut

9Y1210436GEG0065US0

G-48

Page 63

B2420, WSM

IMPORTANT

CAUTION

KiSC issued 06, 2012 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.

9Y1210436GEG0024US0

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 temp.

−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

9Y1210436GEG0025US0

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 (1) (Code No. 07916-52501).

(1) Injector (2) Hose

9Y1210436GEG0026US0

G-49

Page 64

B2420, WSM

CAUTION

NOTE

KiSC issued 06, 2012 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).

• To avoid damage of transmission, do not use rear wheel weights and liquid ballast at the same time.

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 tap (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 8-16 9.5-16 9.5-18

Slush free at −10 °C (14 °F) Solid at −30 °C (−22 °F) [Approx. 1 kg (2 lbs) CaCl 4 L (1 gal.) of water]

Slush free at −24 °C (−11 °F ) Solid at −47 °C (−53 °F) [Approx. 1.5 kg (3.5 lbs) CaCl per 4 L (1 gal.) of water]

Slush free at −47 °C (−53 °F) Solid at −52 °C (−62 °F) [Approx. 2.25 kg (5 lbs) CaCl per 4 L (1 gal.) of water]

per

35 kg

(77 lbs)

37 kg

(82 lbs)

39 kg

(86 lbs)

54 kg

(119 lbs)

57 kg

(126 lbs)

60 kg

(132 lbs)

70 kg

(155 lbs)

74 kg

(163 lbs)

78 kg

(172 lbs)

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

(A) Correct: 75 %

Air Compresses Like A Cushion

(B) Incorrect: 100 %

Full Water Can Not Be Compressed

9Y1210436GEG0027US0

G-50

Page 65

B2420, WSM

NOTE

KiSC issued 06, 2012 A

GENERAL

10. IMPLEMENT LIMITATIONS

The KUBOTA Tractor has been thoroughly tested for proper performance with implements sold or approved by KUBOTA. Use with implements which are not sold or approved by KUBOTA and which exceed the maximum specifications listed below, or which are otherwise unfit for use with the KUBOTA Tractor may result in malfunctions or failures of the tractor, damage to other property and injury to the operator or others. [Any malfunctions or failures of the tractor resulting from use with improper implements are not covered by the warranty.]

WSM000001GEG0083US0

Tread (max. width) with farm tires

Front Rear

Lower link end max. loading

weight W0

B2420 200 kg (440 lbs) 920 kg (2028 lbs) 300 kg (661 lbs)

Actual figures

Trailer loading weight W3

Max. capacity

B2420

Implement Weight W1 and / or

size

As in the following list

(shown on the next page)

Max. Drawbar Load W

300 kg (661 lbs) 1000 kg (2205 lbs)

Lower link end max. hydraulic lifting capacity W0: The max. allowable load which can be put on the lower link end Implement weight W1: The implement's weight which can be put on the lower link Max. drawbar load W2 Trailer loading weight W3: The max. loading weight for trailer (without trailer's weight)

• Implement size may vary depending on soil operating conditions.

9Y1210436GEG0066US0

G-51

Page 66

B2420, WSM

NOTE

KiSC issued 06, 2012 A

No. Implement Remarks B2420

1 Mower

Rotary-cutter (1 Blade)

Rear-mount (2 or 3 Blades)

Max. cutting width Max. weight

122 cm (48.0 in.)

204 kg (450 lbs)

152 cm (59.8 in.)

227 kg (500 lbs)

Flail-mower Max. cutting width 107 cm (42.1 in.)

Sickle bar Max. cutting width 122 cm (48.0 in.)

2 Rotary tiller for dry field

Max. cutting width Max. weight

85 cm (33 in.)

200 kg (441 lbs)

3 Bottom plow Max. size 30 cm (12 in.) × 1

4 Disc plow

Max. size Max. weight

5 Cultivator Max. size

6 Disc harrow

Max. size Max. weight

50.8 cm (20 in.) × 3 190 kg (419 lbs)

122 cm (48.0 in.)

1 Row

45.7 cm (18 in.) × 6,

50.8 cm (20 in.) × 5 190 kg (419 lbs)

Rear mounted Max. tank capacity 150 L (39.6 U.S.gals)

7 Sprayer

Pull type Max. tank capacity 700 L (185 U.S.gals)

8 Rear blade

9 Box blade

10 Trailer

Max. cutting width Max. weight

Max. load capacity Max. drawbar load

152 cm (59.8 in.)

160 kg (353 lbs)

137 cm (53.9 in.)

170 kg (375 lbs)

1000 kg (2205 lbs)

300 kg (661 lbs)

GENERAL

• Implement size may vary depending on soil operating conditions.

9Y1210436GEG0067US0

G-52

Page 67

1 ENGINE

KiSC issued 06, 2012 A

Page 68

MECHANISM

KiSC issued 06, 2012 A

CONTENTS

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

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

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

Page 69

B2420, WSM

KiSC issued 06, 2012 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) Push Rod (12) Tappet (13) Camshaft (14) Piston (15) Connecting Rod (16) Oil Filter Cartridge

This engine's lubricating system consists of oil strainer (9), oil pump (8), relief valve (10), oil filter cartridge (16) and oil pressure switch (2). The oil pump (8) sucks lubricating oil from the oil pan through the oil strainer (9) and the oil flows down to the filter cartridge (16), where it is further filtered. Then the oil is forced to crankshaft, connecting rods (15), idle gear (6), camshaft (13) and rocker arm shaft (3) to lubricate each part.

Some part of oil, splashed by the crankshaft (7) or leaking and dropping from gaps of each part, lubricates these parts: pistons (14), cylinders, small ends of connecting rods (15), tappets (12), push rods (11), inlet and exhaust valves and timing gears.

9Y1210436ENM0001US0

1-M1

Page 70

B2420, WSM

KiSC issued 06, 2012 A

2. COOLING SYSTEM

ENGINE

(1) Radiator (2) Cooling Fan (3) Thermostat (4) Water Pump (5) Cylinder Head Water Jacket (6) Cylinder Block Water Jacket

The cooling system consists of a radiator (1), a centrifugal water pump (4), a cooling fan (2) and a thermostat (3). The water is cooled as it flows through the radiator core, and the cooling air through the radiator core by cooling

fan (2).

The water pump (4) receives water from the radiator (1) or from the cylinder head and force it into the cylinder

block.

The thermostat (3) opens or closes according to the water temperature.

When the water temperature is high, the thermostat (3) opens to allow the water to flow from the cylinder head to the radiator (1). When the water temperature is low, the thermostat close to flow the water only to the water pump (4). The opening temperature of the thermostat (3) is approx 82 °C (179.6 °F).

9Y1210436ENM0002US0

1-M2

Page 71

B2420, WSM

KiSC issued 06, 2012 A

3. FUEL SYSTEM

ENGINE

(1) Fuel Tank (2) Fuel Overflow Pipe (3) Injection Nozzle (4) Fuel Injection Pipe (5) Injection Pump (6) Fuel Feed Pump (7) Fuel Filter

(a) Fuel Flow

Fuel from the fuel tank (1) passes thought the fuel filter (7), and then enters the injection pump (5) after impurities

such as dirt, water, etc. are removed.

The fuel pressurized by the injection pump (5) to the opening pressure (13.73 to 14.71 MPa, 140 to 150 kgf/cm

1991 to 2062 psi), of the injection nozzle (3) is injected into the combustion chamber.

A part of the fuel fed to the injection nozzle (3) lubricates the moving parts of the plunger inside the nozzle, then

returns to the fuel tank (1) through the fuel overflow pipe (2) from the upper part of the nozzle holder.

9Y1210436ENM0003US0

1-M3

Page 72

SERVICING

KiSC issued 06, 2012 A

CONTENTS

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

2. SERVICING SPECIFICATIONS ..................................................................................................1-S4

3. TIGHTENING TORQUES ............................................................................................................1-S9

4. CHECKING, DISASSEMBLING AND SERVICING ...................................................................1-S10

[1] CHECKING AND ADJUSTING............................................................................................ 1-S10

(1) Engine Body ..................................................................................................................1-S10

(2) Lubricating System ........................................................................................................ 1-S12

(3) Cooling System ............................................................................................................. 1-S12

(4) Fuel System...................................................................................................................1-S15

[2] PREPARATION................................................................................................................... 1-S19

(1) Separating Engine from Tractor ....................................................................................1-S19

(2) External Components ....................................................................................................1-S27

[3] DISASSEMBLING AND ASSEMBLING ..............................................................................1-S28

(1) Cylinder Head and Valves ............................................................................................. 1-S28

(2) Timing Gears, Camshaft and Fuel Camshaft ................................................................1-S30

(3) Piston and Connecting Rod ........................................................................................... 1-S34

(4) Flywheel and Crankshaft ...............................................................................................1-S37

(5) Thermostat and Water Pump ........................................................................................1-S38

(6) Injection Nozzle .............................................................................................................1-S39

[4] SERVICING.........................................................................................................................1-S40

(1) Cylinder Head and Valves ............................................................................................. 1-S40

(2) Timing Gears, Camshaft and Governor Gear................................................................ 1-S45

(3) Piston and Connecting Rod ........................................................................................... 1-S48

(4) Crankshaft .....................................................................................................................1-S50

(5) Cylinder .........................................................................................................................1-S54

(6) Oil Pump ........................................................................................................................1-S55

(7) Thermostat ....................................................................................................................1-S56

Page 73

B2420, WSM

KiSC issued 06, 2012 A

1. TROUBLESHOOTING

ENGINE

Symptom Probable Cause Solution

Engine Does Not Start

Starter Does Not Run Battery discharged Charge G-20

Engine Revolution Is Not Smooth

No fuel Replenish fuel G-8

Air in the fuel system Bleed G-31

Water in the fuel system Change fuel and

repair or replace fuel system

Fuel hose clogged Clean G-24

Fuel filter clogged Clean or Change G-22

Excessively high viscosity of fuel or engine oil at low temperature

Fuel with low cetane number Use specified fuel G-9

Fuel leak due to loose injection pipe retaining nut Tighten retaining nut 1-S28

Incorrect injection timing Adjust 1-S15

Fuel camshaft worn Replace 1-S32

Injection nozzle clogged Clean 1-S18

Injection pump malfunctioning Repair or replace 1-S32

Seizure of crankshaft, camshaft, piston, cylinder or bearing

Compression leak from cylinder Replace head gasket,

Improper valve timing Correct or replace

Piston ring and cylinder worn Replace 1-S49

Excessive valve clearance Adjust 1-S11

Stop solenoid malfunctioning Replace 9-S16

Main gear shift switch malfunctioning Adjust or replace 9-S13

Rear PTO switch malfunctioning Adjust or replace 9-S14

Starter malfunctioning Repair or replace 9-S33

Main switch malfunctioning Repair or replace 9-S13

Main gear shift switch malfunctioning Adjust or replace 9-S13

Rear PTO switch malfunctioning Adjust or replace 9-S14

Wiring disconnected Connect –

Fuel filter clogged or dirty Clean or replace G-22

Air cleaner clogged Clean or replace G-22

Fuel leak due to loose injection pipe retaining nut Tighten retaining nut 1-S28

Injection pump malfunctioning Repair or replace 1-S32

Incorrect nozzle injection pressure Adjust 1-S17

Injection nozzle stuck or clogged Repair or replace 1-S18

Governor malfunctioning Repair 1-S33

Use specified fuel or engine oil

Repair or replace 1-S36

tighten cylinder head screw, glow plug and nozzle holder

timing gear

Reference

Page

–

G-8

1-S38

1-S10

1-S33

1-S1

Page 74

B2420, WSM

KiSC issued 06, 2012 A

ENGINE

Symptom Probable Cause Solution

Either White or Blue Exhaust Gas Is Observed

Excessive engine oil Reduce to specified

level

Piston ring and cylinder worn or stuck Repair or replace 1-S49

Reference

Page

G-15

Incorrect injection timing Adjust 1-S15

Deficient compression Adjust top clearance 1-S10

1-S49

Either Black or Dark Gray Exhaust Gas Is Observed

Overload Lessen load –

Low grade fuel used Use specified fuel G-8

Fuel filter clogged Clean or replace G-22

Air cleaner clogged Clean or replace G-22

Deficient nozzle injection Repair or replace

1-S18

nozzle

Deficient Output Incorrect injection timing Adjust 1-S15

Engine's moving parts seem to be seizing Repair or replace –

Uneven fuel injection Repair or replace

1-S32

injection pump

Deficient nozzle injection Repair or replace

1-S18

nozzle

Compression leak Replace head gasket,

1-S10 tighten cylinder head screw, glow plug and nozzle holder

Excessive Lubricant Oil Consumption

Piston ring's gap facing the same direction Shift ring gap

direction

1-S49

Oil ring worn or stuck Replace 1-S49

Piston ring groove worn Replace piston 1-S49

Valve stem and valve guide worn Replace 1-S42

Oil leaking due to defective seals or packing Replace –

Fuel Mixed into Lubricant Oil

Injection pump's plunger worn Replace pump

element or injection

1-S32

pump

Deficient nozzle injection Repair or replace

1-S18 nozzle

Injection pump broken Replace 1-S32

Water Mixed into Lubricant Oil

Head gasket defective Replace 1-S29

Cylinder block or cylinder head flawed Replace 1-S29

1-S2

Page 75

B2420, WSM

KiSC issued 06, 2012 A

ENGINE

Symptom Probable Cause Solution

Reference

Page

Low Oil Pressure Engine oil insufficient Replenish G-15

Oil strainer clogged Clean 1-S34

Oil filter cartridge clogged Replace 1-S15

Relief valve stuck with dirt Clean –

Relief valve spring weaken or broken Replace –

Excessive oil clearance of crankshaft bearing Replace 1-S52

Excessive oil clearance of crankpin bearing Replace 1-S51

Excessive oil clearance of rocker arm Replace 1-S44

Oil passage clogged Clean –

Different type of oil used and mixed Use specified type of

G-8

oil

Oil pump defective Repair or replace 1-S55

High Oil Pressure Different type of oil used and mixed Use specified type of

G-8

oil

Relief valve defective Replace –

Engine Overheated Engine oil insufficient Replenish G-15

Fan belt broken or tensioned improperly Replace or adjust G-23

Coolant insufficient Replenish G-8

Radiator net and radiator fin clogged with dust Clean –

Inside of radiator corroded Clean or replace G-28

Coolant flow route corroded Clean or replace G-28

Radiator cap defective Replace 1-S13

Radiator hose damaged Replace G-25

Overload running Loosen load –

Head gasket defective Replace 1-S29

Incorrect injection timing Adjust 1-S15

Unsuitable fuel used Use specified fuel G-8

1-S3

9Y1210436ENS0001US0

Page 76

B2420, WSM

KiSC issued 06, 2012 A

ENGINE

2. SERVICING SPECIFICATIONS

ENGINE BODY

Item Factory Specification Allowable Limit

Cylinder Head Surface Flatness – 0.05 mm

0.002 in.

Top Clearance 0.55 to 0.75 mm

0.022 to 0.029 in.

Compression Pressure (When Cranking with Starter Motor) 3.73 to 4.11 MPa

38.0 to 42.0 kgf/cm 541 to 597 psi

Variance among Cylinders – 10 % or less

Valve Clearance (Cold) 0.145 to 0.185 mm

0.00571 to 0.00728 in.

Valve Seat Width 2.12 mm

0.0835 in.

Valve Seat (Angle) Intake

1.0 rad 60 °

–

2.26 MPa

23.0 kgf/cm 327 psi

–

Exhaust

Valve Face (Angle) Intake

Exhaust

Valve Recessing –0.050 to 0.25 mm

Valve Stem to Valve Guide

• Valve Stem

• Valve Guide

Valve Spring Free Length

Clearance

O.D.

I.D.

Setting Load

0.79 rad 45 °

1.0 rad 60 °

0.79 rad 45 °

–0.0020 to 0.0098 in.

0.035 to 0.065 mm

0.0014 to 0.0025 in.

6.960 to 6.975 mm

0.2741 to 0.2746 in.

7.010 to 7.025 mm

0.2760 to 0.2765 in.

37.0 to 37.5 mm

1.46 to 1.47 in.

117.4 N / 31.0 mm

11.97 kgf / 31.0 mm

26.39 lbf / 1.22 in.

–

0.40 mm

0.016 in.

0.10 mm

0.0039 in.

–

36.5 mm

1.44 in.

100.0 N / 31.0 mm

10.20 kgf / 31.0 mm

22.48 lbf / 1.22 in.

Setting Length

Tilt

1-S4

31.0 mm

1.22 in.

–

1.0 mm

0.039 in.

Page 77

B2420, WSM

KiSC issued 06, 2012 A

Rocker Arm Shaft to Rocker Arm

ENGINE

Item Factory Specification Allowable Limit

Clearance

0.016 to 0.045 mm

0.00063 to 0.0017 in.

0.10 mm

0.0039 in.

• Rocker Arm Shaft

O.D.

11.973 to 11.984 mm

–

0.47138 to 0.47181 in.

• Rocker Arm

I.D.

12.000 to 12.018 mm

–

0.47244 to 0.47314 in.

Push Rod Alignment – 0.25 mm

0.0098 in.

Tappet to Tappet Guide

• Tappet

Clearance

O.D.

0.020 to 0.062 mm

0.00079 to 0.00244 in.

19.959 to 19.980 mm

0.07 mm

0.003 in.

–

0.78579 to 0.78661 in.

• Tappet Guide

I.D.

20.000 to 20.021 mm

–

0.78740 to 0.78822 in.

Camshaft Side Clearance

Alignment

0.070 to 0.22 mm

0.0028 to 0.0086 in.

–

0.30 mm

0.012 in.

0.01 mm

0.0004 in.

Cam Height Intake

28.80 mm

1.134 in.

28.75 mm

1.132 in.

Exhaust

29.00 mm

1.142 in.

Camshaft Journal to Cylinder Block Bore

Clearance

0.050 to 0.091 mm

0.0020 to 0.0035 in.

• Camshaft Journal

O.D.

35.934 to 35.950 mm

1.4148 to 1.4153 in.

• Cylinder Block Bore

I.D.

36.000 to 36.025 mm

1.4174 to 1.4183 in.

Timing Gear

• Crank Gear to Idle Gear

Backlash

0.0320 to 0.115 mm

0.00126 to 0.00452 in.

• Idle Gear to Cam Gear

Backlash

0.0360 to 0.114 mm

0.00142 to 0.00448 in.

• Idle Gear to Injection Pump Gear

Backlash

0.0340 to 0.116 mm

0.00134 to 0.00456 in.

• Injection Pump Gear to Governor Gear

Backlash

0.0300 to 0.117 mm

0.00119 to 0.00460 in.

Idle Gear Side Clearance 0.20 to 0.51 mm

0.0079 to 0.020 in.

28.95 mm

1.140 in.

0.15 mm

0.0059 in.

–

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.80 mm

0.031 in.

1-S5

Page 78

B2420, WSM

KiSC issued 06, 2012 A

Item Factory Specification Allowable Limit

Idle Gear Shaft to Idle Gear Bushing

Clearance

0.020 to 0.054 mm

0.00079 to 0.0021 in.

ENGINE

0.10 mm

0.0039 in.

• Idle Gear Shaft

O.D.

25.967 to 25.980 mm

–

1.0224 to 1.0228 in.

• Idle Gear Bushing

I.D.

26.000 to 26.021 mm

–

1.0237 to 1.0244 in.

Piston Pin Bore I.D. 22.000 to 22.013 mm

0.86615 to 0.86665 in.

Piston Ring Clearance Second Ring

0.0850 to 0.112 mm

0.00335 to 0.00440 in.

Oil Ring

0.020 to 0.055 mm

0.00079 to 0.0021 in.

Piston Ring Gap Top Ring

0.20 to 0.35 mm

0.0079 to 0.013 in.

Second Ring

0.40 to 0.55 mm

0.016 to 0.021 in.

Oil Ring

0.30 to 0.55 mm

0.012 to 0.021 in.

22.03 mm

0.8673 in.

0.2 mm

0.008 in.

0.15 mm

0.0059 in.

1.20 mm

0.0472 in.

1.20 mm

0.0472 in.

1.25 mm

0.00492 in.

Connecting Rod Alignment – 0.05 mm

0.002 in.

Piston Pin to Small End Bushing

Clearance

0.014 to 0.038 mm

0.00056 to 0.0014 in.

0.15 mm

0.0059 in.

•Piston Pin

O.D.

22.002 to 22.011 mm

–

0.86622 to 0.86657 in.

• Small End Bushing

I.D.

22.025 to 22.040 mm

–

0.86713 to 0.86771 in.

Crankshaft Alignment – 0.02 mm

0.0008 in.

Crankshaft Journal to Crankshaft Bearing 1

• Crankshaft Journal

Oil Clearance

O.D.

0.0340 to 0.114 mm

0.00134 to 0.00448 in.

47.934 to 47.950 mm

0.20 mm

0.0079 in.

–

1.8872 to 1.8877 in.

• Crankshaft Bearing 1

I.D.

47.984 to 48.048 mm

–

1.8892 to 1.8916 in.

Crankshaft Journal to Crankshaft Bearing 2

• Crankshaft Journal

Oil Clearance

O.D.

0.034 to 0.095 mm

0.0014 to 0.0037 in.

47.934 to 47.950 mm

0.20 mm

0.0079 in.

–

1.8872 to 1.8877 in.

• Crankshaft Bearing 2

I.D.

47.984 to 48.029 mm

–

1.8892 to 1.8909 in.

1-S6

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B2420, WSM

KiSC issued 06, 2012 A

Item Factory Specification Allowable Limit

Crankshaft Journal to Crankshaft Bearing 3

Oil Clearance

0.034 to 0.098 mm

0.0013 to 0.004 in.

ENGINE

0.20 mm

0.0079 in.

• Crankshaft Journal

O.D.

51.921 to 51.940 mm

2.0441 to 2.0449 in.

• Crankshaft Bearing 3

I.D.

51.974 to 52.019 mm

2.0462 to 2.0480 in.

Crankpin to Crankpin Bearing

Oil Clearance

0.029 to 0.091 mm

0.0012 to 0.0035 in.

• Crankpin

O.D.

39.959 to 39.975 mm

1.5732 to 1.5738 in.

• Crankpin Bearing

I.D.

40.040 to 40.050 mm

1.5764 to 1.5767 in.

Crankshaft Side Clearance 0.15 to 0.31 mm

0.0059 to 0.012 in.

Cylinder

• Standard

I.D.

78.000 to 78.019 mm

3.0709 to 3.0716 in.

• Oversize: 0.5 mm (0.0197 in.)

I.D.

78.500 to 78.519 mm

3.0906 to 3.0912 in.

LUBRICATING SYSTEM

Item Factory Specification Allowable Limit

Engine Oil Pressure At Idle Speed

More than 49 kPa

0.50 kgf/cm

7.1 psi

–

0.20 mm

0.0079 in.

–

0.50 mm

0.020 in.

78.15 mm

3.077 in.

78.65 mm

3.096 in.

–

At Rated Speed

197 to 441 kPa

2.00 to 4.50 kgf/cm

28.5 to 64.0 psi

Inner Rotor to Outer Rotor Clearance 0.060 to 0.18 mm

0.0024 to 0.0071 in.

Outer Rotor to Pump Body Clearance 0.100 to 0.180 mm

0.00394 to 0.00708 in.

Rotor to Cover End Clearance 0.025 to 0.075 mm

0.00099 to 0.0029 in.

1.50 kgf/cm

21.3 psi

–

147 kPa

1-S7

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KiSC issued 06, 2012 A

COOLING SYSTEM

Item Factory Specification Allowable Limit

Thermostat

• Valve Opening Temperature At Beginning

69.5 to 72.5 °C

157.1 to 162.5 °F

ENGINE

–

Opened Completely

Radiator Water Leakage

Tes t Pr ess ure

85 °C

185 °F

No leak at

137 kPa

1.40 kgf/cm

–

19.9 psi

Radiator Cap Pressure Falling

Time

More than 10 seconds

for pressure fall

–

from 88 to 59 kPa

from 0.90 to

0.60 kgf/cm

from 13 to 8.5 psi

Fan Belt Tension 7.0 to 9.0 mm

–

(0.28 to 0.35 in.)

deflection at 98 N

(10 kgf, 22 lbf) of force

FUEL SYSTEM

Item Factory Specification Allowable Limit

Injection Pump Injection Timing 0.2793 to 0.3141 rad

–

(16.00 to 18.00 °)

before T.D.C.

Pump Element Fuel Tightness – 13.73 MPa

140.0 kgf/cm 1991 psi

Delivery Valve Fuel Tightness 10 seconds

13.73 → 12.75 MPa

140.0 →

130.0 kgf/cm

1991 → 1849 psi

Fuel Injection Nozzle Injection Pressure 13.73 to 14.70 MPa

140.0 to 150.0 kgf/cm

5 seconds

13.73 → 12.75 MPa

140.0 →

130.0 kgf/cm

1991 → 1849 psi

–

1992 to 2133 psi

Fuel Injection Nozzle Valve Seat Valve Seat

Tightness

No fuel leak at

12.75 MPa

130.0 kgf/cm

–

1849 psi

9Y1210436ENS0002US0

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NOTE

KiSC issued 06, 2012 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: See page G-10.)

[TRACTOR BODY]

Item N·m kgf·m lbf·ft

Steering wheel mounting nut 30 to 49 3.0 to 5.0 22 to 36

Drag link slotted nut 18 to 35 1.9 to 3.5 14 to 25

Power Steering delivery pipe nut 65 to 75 6.7 to 7.6 48 to 55

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

Clutch housing and engine mounting screw (M8) 18 to 21 1.8 to 2.1 13 to15

Clutch housing and engine mounting nut (M10) 48 to 55 4.9 to 5.7 36 to 41

Clutch cover mounting screw 24 to 27 2.4 to 2.8 18 to 20

Front lower frame mounting bolt (M12, 7T) [If equipped] 77.5 to 90.1 7.9 to 9.2 58.0 to 66.0

Front frame mounting bolt (M14, 9T) [If equipped] 167 to 196 17.0 to 20.0 123 to 145

Upper frame mounting bolt (M16, 7T) [If equipped] 196 to 225 20.0 to 23.0 145 to 166

[ENGINE]

Item Size × Pitch N·m kgf·m lbf·ft

Cylinder head cover cap nut M7 × 1.0 7 to 8 0.7 to 0.9 5 to 6

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

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

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

Glow plug M8 × 1.0 7.9 to 14 0.8 to 1.5 5.8 to 10

*Rocker arm bracket nut M7 × 1.0 22 to 26 2.2 to 2.7 16 to 19

*Cylinder head screw M10 × 1.25 64 to 68 6.5 to 7.0 47 to 50

Fan drive pulley retaining screw M14 × 1.5 236 to 245 24.0 to 25.0 174 to 180

*Connecting rod screw M8 × 1.0 42 to 46 4.2 to 4.7 31 to 33

*Flywheel screw M12 × 1.25 54 to 58 5.5 to 6.0 40 to 43

*Main bearing case screw 1 M8 × 1.25 30 to 34 3.0 to 3.5 22 to 25

*Main bearing case screw 2 M9 × 1.25 49 to 53 5.0 to 5.5 37 to 39

Bearing case cover mounting screw M6 × 1.0 9.81 to 11.2 1.00 to 1.15 7.24 to 8.31

• In removing and applying the bolts and nuts marked with "*", a pneumatic wrench or similar pneumatic tool, if employed, must be used with enough care not to get them seized.

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

• The letter "M" in Size x 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.

9Y1210436ENS0003US0

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NOTE

KiSC issued 06, 2012 A

ENGINE

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

(1) Engine Body

Compression Pressure

1. Run the engine until it is warmed up.

2. Stop the engine.

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

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

5. Engage the parking brake.

6. Set a compression tester (Code No. 07909-30208) with the adaptor (Adaptor H, Code No. 07909-31231) to the nozzle hole.

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

8. Repeat steps 6 and 7 for each cylinder.

9. 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.

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

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

• Check the compression pressure with the specified valve clearance.

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

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

Compression pressure

Factory specification

Allowable limit

3.73 to 4.11 MPa

38.0 to 42.0 kgf/cm 541 to 597 psi

2.26 MPa

23.0 kgf/cm 327 psi

9Y1210436ENS0004US0

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IMPORTANT

NOTE

KiSC issued 06, 2012 A

ENGINE

Valve Clearance

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

1. Remove the head cover, the glow plugs and the timing window (3) cover on the clutch housing.

2. Align the "1TC" marking line (4) on the flywheel and center of timing window so that the No. 1 piston comes to the compression top dead center.

3. Check the following valve clearance marked with "," using a feeler gauge.

4. If the clearance is not within the factory specifications, loosen the lock nut (2) and adjust with the adjusting screw (1).

5. Turn the flywheel 6.28 rad (360 °) and align the "1TC" marking line and the center of timing window.

6. Check the remaining valve clearance in a same way.

Valve clearance "A" Factory specification

0.145 to 0.185 mm

0.00571 to 0.0728 in.

• 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 T.D.C. position when the "TC" marking line is aligned with center of timing 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. The piston is at the compression top dead center when both the IN. and EX. valves do not move; it is at the overlap position when both the valves move.

• After turning the flywheel counterclockwise twice or three times, recheck the valve clearance, firmly tighten the lock nut of the adjusting screw.

• The sequence of cylinder numbers is given as No. 1, No. 2 and No. 3 starting from the gear case side.

Adjustable cylinder location of

When No. 1 piston comes to compression top dead center

When No. 1 piston comes to overlap position

piston

No. 1 ,,

No. 2 ,

No. 3 ,

No. 1

No. 2 ,

No. 3 ,

Valve arrangement

IN. EX.

(1) Adjusting Screw (2) Lock Nut (3) Timing Window (4) 1TC Marking Line

1-S11

A: Valve Clearance

9Y1210436ENS0005US0

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KiSC issued 06, 2012 A

(2) Lubricating System

ENGINE

Engine Oil Pressure

1. Remove the engine oil pressure switch, and set a oil pressure tester (Code No. 07916-32032). (Adapter 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 defective

• Oil strainer clogged

• Oil filter cartridge clogged

• Oil gallery clogged

• Excessive oil clearance

• Foreign matter in the relief valve

More than

Engine oil pressure

Factory specification

Allowable limit

At idle speed

At rated speed

49 kPa

0.50 kgf/cm

7.1 psi

197 to 441 kPa

2.00 to 4.50 kgf/cm

28.5 to 64.0 psi

147 kPa

1.50 kgf/cm

21.3 psi

(3) Cooling System

(When reassembling)

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

14.7 to 19.6 N·m

Tightening torque Oil pressure switch

1.5 to 2.0 kgf·m 11 to 14 lbf·ft

9Y1210436ENS0006US0

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

7.0 to 9.0 mm

0.28 to 0.35 in.

9Y1210436ENS0007US0

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B2420, WSM

CAUTION

KiSC issued 06, 2012 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

9Y1210436ENS0008US0

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 (1) and adaptor (2) 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

8.5 psi).

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

More than 10 seconds for pressure fall from

Pressure falling time Factory specification

(1) Radiator Tester (2) Adaptor

88 to 59 kPa (from 0.90 to 0.60 kgf/cm from 13 to 8.5 psi)

9Y1210436ENS0009US0

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B2420, WSM

CAUTION

KiSC issued 06, 2012 A

ENGINE

Radiator Water 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. Pour a specified amount of water into the radiator.

2. Set a radiator tester (1), adaptor (2) and raise the water pressure to the specified pressure.

3. Check the radiator for water leaks.

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

Radiator water leakage test pressure

(1) Radiator Tester (2) Adaptor

Factory specification

137 kPa

1.40 kgf/cm

19.9 psi

9Y1210436ENS0010US0

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B2420, WSM

CAUTION

NOTE

KiSC issued 06, 2012 A

ENGINE

(4) Fuel System

• Check the injection pressure and condition after confirming 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.

9Y1210436ENS0011US0

Injection Timing

1. Remove the injection pipes and timing window cover.

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

3. Turn the flywheel counterclockwise (facing the flywheel) until fuel flows from the delivery valve holder.

4. Continue to turn the flywheel slowly, and stop it as soon as the fuel level at the tip of the delivery valve holder begins to increase.

5. Check to see if the timing angle lines on the flywheel is aligned with the alignment mark (2).

6. If the injection timing is out of adjustment, readjust the timing with the injection pump shims (3).

0.2793 to 0.3141 rad

Injection timing Factory specification

(16.00 to 18.00 °) before T.D.C.

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

• Shims are available in thickness of 0.0175 mm (0.000689 in.), 0.20 mm (0.0079 in.), 0.25 mm (0.0098 in.),

0.30 mm (0.012 in.) and 0.35 mm (0.014 in.). Combine these shims for adjustments.

• Addition or reduction of shim (0.05 mm, 0.002 in.) delays or advances the injection timing by approx. 0.009 rad (0.5 °).

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

• Refer to figure to check the thickness of the shims.

(Reference)

• The alignment mark (2) of the injection timing line (1) is not in alignment with the center of the timing window.

• The above mark (2) comes aligned with the center of the clutch housing rib.

(1) Timing Line (2) Alignment Mark (3) Injection Pump Shim

(Soft Metal Gasket Shim)

(4) Shim with three Holes: 0.35 mm

(0.014 in.)

(5) Shim with two Holes:

0.0175 mm and 0.20 mm (0.000689 in. and 0.0079 in.)

(6) Shim with one Hole: 0.25 mm

(0.0098 in.)

(7) Shim without Hole: 0.30 mm

(0.012 in.)

9Y1210436ENS0012US0

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B2420, WSM

NOTE

KiSC issued 06, 2012 A

ENGINE

Fuel Tightness of Pump Element

1. Remove the engine stop solenoid.

2. Remove the injection pipes and glow plugs.

3. Install the injection pump pressure tester to the injection pump.

4. Install the injection nozzle (1) jetted with the proper injection pressure to the injection pump pressure tester (2). (Refer to the photo.)

5. Set the speed control lever to the maximum speed position.

6. Run the starter to increase the pressure.

7. If the pressure can not reach the allowable limit, replace the pump with new one or repair with a Kubota-authorized pump service shop.

Fuel tightness of pump element

Allowable limit

13.73 MPa

140.0 kgf/cm 1991 psi

• Never try to disassemble the injection pump assembly. For repairs, you are strongly requested to contact a Kubota-authorized pump service shop.

(1) Injection Nozzle (2) Injection Pump Pressure Tester

(3) Protection Cover for Jetted Fuel

9Y1210436ENS0013US0

Fuel Tightness of Delivery Valve

1. Remove the engine stop solenoid.

2. Remove the injection pipes and glow plugs.

3. Set a pressure tester to the fuel injection pump.

4. Install the injection nozzle (1) jetted with the proper injection pressure to the injection pump pressure tester (2).

5. Run the starter to increase the pressure.

6. Stop the starter when the fuel jets from the injection nozzle. After that, turn the flywheel by the hand and raise the pressure to approx. 13.73 MPa (140.0 kgf/cm

, 1991 psi).

7. Now turn the flywheel back about half a turn (to keep the plunger free). Maintain the flywheel at this position and clock the time taken for the pressure to drop from 13.73 to 12.75 MPa (from

140.0 to 130.0 kgf/cm

8. Measure the time needed to decrease the pressure from 13.73 to 12.75 MPa (from 140.0 to 130.0 kgf/cm

, from 1991 to 1849 psi).

, from 1991 to

1849 psi).

9. If the measurement is less than allowable limit, replace the pump with new one or repair with a Kubota-authorized pump service shop.

10 seconds

Factory specification

Fuel tightness of delivery valve

Allowable limit

13.73 → 12.75 MPa

140.0 → 130.0 kgf/cm 1991 →1849 psi

5 seconds

13.73 → 12.75 MPa

140.0 → 130.0 kgf/cm 1991 → 1849 psi

• Never try to disassemble the injection pump assembly. For repairs, you are strongly requested to contact a Kubota-authorized pump service shop.

(1) Injection Nozzle (2) Injection Pump Pressure Tester

(3) Protection Cover for Jetted Fuel

9Y1210436ENS0014US0

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B2420, WSM

CAUTION

KiSC issued 06, 2012 A

ENGINE

Nozzle Spraying Condition

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

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

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

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

(a) Good (b) Bad

9Y1210436ENS0015US0

Fuel Injection Pressure

1. Set the injection nozzle to a nozzle tester (Code No. 07909-31361).

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

13.73 to 14.70 MPa

140.0 to 150.0 kgf/cm 1992 to 2133 psi

(Reference)

• Pressure variation with 0.01 mm (0.0004 in.) difference of adjusting washer thickness. Approx. 235 kPa (2.41 kgf/cm

34.1 psi).

(1) Adjusting Washer

9Y1210436ENS0016US0

Valve Seat Tightness

1. Set the injection nozzle to a nozzle tester (Code No. 07909-31361).

2. Raise the fuel pressure, and keep at 12.75 MPa (130.0 kgf/cm 1849 psi) for 10 seconds.

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

No fuel leak at

Valve seat tightness Factory specification

12.75 MPa

130.0 kgf/cm 1849 psi

9Y1210436ENS0017US0

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B2420, WSM

KiSC issued 06, 2012 A

ENGINE

Nozzle Holder

1. Secure the nozzle retaining nut (7) with a vise.

2. Remove the nozzle holder (1), and take out parts inside.

(When reassembling)

• Assemble the nozzle in clean fuel oil.

• Install the push rod (4), noting its direction.

• After assembling the nozzle, be sure to adjust the fuel injection pressure.

35 to 39 N·m

Tightening torque

Nozzle holder

Overflow pipe nut

Nozzle holder assembly

3.5 to 4.0 kgf·m 26 to 28 lbf·ft

20 to 24 N·m

2.0 to 2.5 kgf·m 15 to 18 lbf·ft

49 to 68 N·m

5.0 to 7.0 kgf·m 37 to 50 lbf·ft

(1) Nozzle Holder (2) Adjusting Washer (3) Nozzle Spring (4) Push Rod

(5) Distance Piece (6) Nozzle Piece (7) Nozzle Retaining Nut

9Y1210436ENS0018US0

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CAUTION

NOTE

KiSC issued 06, 2012 A

[2] PREPARATION

(1) Separating Engine from Tractor

Mid Mount ROPS [If Equipped]

To avoid personal injury:

• Adjust free fall after confirming that no bystanders are

• Sudden movement may occur as a result of improper

1. Disconnect the front combination lamp lead wire and frame

2. Remove the upper frame mounting bolts and nuts, then remove

3. Remove the front frame mounting bolts, then remove the front

4. Remove the front lower frame mounting bolts and nuts, then

Tightening torque

nearby.

adjustment.

earth cable.

the front upper frame (2).

frames (3).

remove the front lower frame (5).

Front lower frame mounting bolt (M12, 7T)

Front frame mounting bolt (M14, 9T)

Upper frame mounting bolt (M16, 7T)

ENGINE

77.5 to 90.1 N·m

7.9 to 9.2 kgf·m

58.0 to 66.0 lbf·ft

167 to 196 N·m

17.0 to 20.0 kgf·m 123 to 145 lbf·ft

196 to 225 N·m

20.0 to 23.0 kgf·m 145 to 166 lbf·ft

(1) Front Axle Frame (2) Front Upper Frame (3) Front Frame

(4) Clutch Housing (5) Front Lower Frame

9Y1210436ENS0019US0

Bonnet, Front Grille, Side Cover and Battery Negative Cable

1. Open the bonnet (2) and remove the front grille (1).

2. Disconnect the battery negative cable (4).

3. Disconnect the head light connectors, horn connectors and remove the bonnet (2).

4. Remove the side covers (3).

• When disconnecting the battery cables, disconnect the negative cable (4) first. When connecting, positive cable first.

(1) Front Grille (2) Bonnet

(3) Side Cover (4) Battery Negative Cable

9Y1210436ENS0020US0

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CAUTION

KiSC issued 06, 2012 A

ENGINE

Draining Coolant

• Never open the radiator cap while operating or immediately after stopping. Otherwise, hot water will spout out from the radiator. Wait for more than ten minutes to cool the radiator, before opening the cap.

1. Loosen the drain cock (3) from the radiator hose to drain coolant.

2. Remove the radiator cap (1) to drain coolant completely.

Coolant (with recovery tank)

Capacity

3.9 L

4.1 U.S.qts

3.4 lmp.qts

(1) Radiator Cap (2) Recovery Tank

(3) Drain Cock

9Y1210436ENS0021US0

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B2420, WSM

IMPORTANT

KiSC issued 06, 2012 A

ENGINE

Draining Engine Oil

1. Place an oil pan underneath the engine.

2. To drain the used oil, remove the drain plug (1) at the bottom of the engine and drain the oil completely.

3. Screw in the drain plug (1).

(When refilling)

• Fill with the new oil up to the upper notch on the dipstick.

• Never mix two different types of oil.

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

• Refer to "LUBRICANTS, FUEL AND COOLANT". (See page G-8.)

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

A: Oil level is acceptable within this

range.

9Y1210436ENS0022US0

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B2420, WSM

IMPORTANT

KiSC issued 06, 2012 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 refilling)

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

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

• Use only multi-grade transmission oil. Use of other oils may damage the transmission or hydraulic system. Refer to "LUBRICANTS, FUEL AND COOLANT" (See page G-8).

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

• Do not mix different brands oil together.

Transmission fluid Capacity

14 L

3.7 U.S.gals

3.1 lmp.gals

(1) Drain Plug (2) Filling Plug (3) Dipstick

A: Oil level is acceptable within this

range

9Y1210436ENS0023US0

Steering Wheel

1. Remove the steering wheel cap.

2. Remove the steering wheel mounting nut and remove the steering wheel (1) with a steering wheel puller (2).

(When reassembling)

Tightening torque

Steering wheel mounting nut

30 to 49 N·m

3.0 to 5.0 kgf·m 22 to 36 lbf·ft

(1) Steering Wheel (2) Steering Wheel Puller

9Y1210436ENS0024US0

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KiSC issued 06, 2012 A

ENGINE

Meter Panel and Panel Under Cover

1. Tap out the spring pin (2) and remove the hand accelerator lever (1).

2. Open the meter panel (3) and disconnect the hourmeter cable, meter panel connector (6), combination switch connector (4) and hazard switch connector (7). Then remove the meter panel (3).

3. Disconnect the main switch connector (8) and remove the panel under cover (5).

(1) Hand Accelerator Lever (2) Spring Pin (3) Meter Panel (4) Combination Switch Connector

(5) Panel Under Cover (6) Meter Panel Connector (7) Hazard Switch Connector (8) Main Switch Connector

9Y1210436ENS0025US0

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KiSC issued 06, 2012 A

ENGINE

Fuel Tank

1. Disconnect the fuel hose (2) at the fuel filter side, then drain fuel completely.

2. Disconnect the wire harness clamps (1).

3. Remove the fuel tank frame stay (4). Disconnect the overflow hoses (3) and pull out the hour meter cable (5).

4. Disconnect the flasher unit connector (11), relays (7) and lead wires (9), (10) for fuel gauge.

5. Disconnect the OPC timer connector. (Only OPC model)

6. Disconnect the front combination lamp lead wires (12) and flame earth cable (13).

7. Remove the fuel tank (8) with tank frame (6).

(1) Wire Harness Clamp (2) Fuel Hose (3) Overflow Hose (4) Fuel Tank Frame Stay (5) Hour Meter Cable (6) Fuel Tank Frame (7) Relay (8) Fuel Tank (9) Lead Wire

(10) Lead Wire (11) Flasher Unit Connector (12) Front Combination Lamp Lead Wire (13) Flame Earth Cable (14) OPC Timer

[A] Without OPC Model [B] With OPC Model

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IMPORTANT

KiSC issued 06, 2012 A

ENGINE

Hydraulic Pipes and Drag Link

1. Remove the accelerator rod (2).

2. Remove the power steering delivery pipe (1).

3. Disconnect the pipe clamp and disconnect the 3-point hitch delivery pipe (3).

4. Disconnect the suction hose (4).

5. Disconnect the glow plug lead wire, thermo sensor lead wire, stop solenoid connector, oil pressure switch lead wire, alternator connector and starter motor lead wire.

6. Disconnect the drag link (5) with a tie-rod end lifter.

(When reassembling)

• Do not loosen the slotted nut (6) to align the hole.

• Install the cotter pin as shown in the figure.

Power steering delivery pipe nut

Tightening torque

Slotted nut

65 to 75 N·m

6.7 to 7.6 kgf·m 48 to 55 lbf·ft

18 to 35 N·m

1.9 to 3.5 kgf·m 14 to 25 lbf·ft

(1) Power Steering Delivery pipe (2) Accelerator Rod (3) 3-point Hitch Delivery Pipe

(4) Suction Hose (5) Drag Link (6) Slotted Nut

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Universal Joint

1. Loosen the clamp (2) and slide the universal joint cover (1) to the rear.

2. Tap out the spring pins (3).

3. Disconnect the bearing holder (4) and then slide the universal joint to the rear.

(When reassembling)

• Apply grease to the splines of the propeller shaft and universal joint.

• When inserting the spring pins (3), face their splits in the direction parallel to the universal joint as shown in the figure.

• Arrange the position of the clamp (2) at side as shown in figure.

• Replace the spring pins (3) with new ones.

(1) Universal Joint Cover (2) Clamp

(3) Spring Pin (4) Bearing Holder

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KiSC issued 06, 2012 A

ENGINE

Separating the Engine from the Clutch Housing

1. Place the disassembling jack under the engine and center frame.

2. Remove the engine mounting screws and nut, then separate the engine from the clutch housing with starter motor.

(When reassembling)

• Apply liquid gasket (Three Bond 1211 or equivalent) to joint face of the engine and clutch housing.

• Apply liquid gasket (Three Bond 1211 or equivalent) to joint face of the engine and starter motor.

Clutch housing and engine mounting screw (M8)

Tightening torque

Clutch housing and engine mounting screw (M10)

18 to 21 N·m

1.8 to 2.1 kgf·m 13 to 15 lbf·ft

48 to 21 N·m

4.9 to 5.7 kgf·m 36 to 41 lbf·ft

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Battery, Recovery Tank, Battery Stay and Radiator Assembly

1. Remove the positive cable.

2. Remove the battery retainer and then remove the battery (3).

3. Remove the recovery tank (5).

4. Remove the battery stay (2).

5. Remove the fuel filter (4).

6. Remove the muffler pipe (6) and muffler (8).

7. Disconnect the radiator hoses (7).

8. Disconnect the drain cock assembly (9).

(1) Radiator Assembly (2) Battery Stay (3) Battery (4) Fuel Filter (5) Recovery Tank

(6) Muffler Pipe (7) Radiator Hose (8) Muffler (9) Drain Cock Assembly

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Separating the Engine from Front Axle Assembly

1. Place the disassembling stand under the front axle frame.

2. Remove the front axle frame mounting screws.

3. Separate the engine from the front axle assembly.

(When reassembling)

78 to 90 N·m

7.9 to 9.2 kgf·m 58 to 66 lbf·ft

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Tightening torque

Front axle frame mounting screw

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IMPORTANT

NOTE

KiSC issued 06, 2012 A

(2) External Components

ENGINE

Outer Parts of Engine

1. Remove the cooling fan (1), fan belt (3), fan pulley, hour meter cable (2), alternator and radiator hoses.

2. Remove the air cleaner (5), inlet hose (4) and air cleaner bracket.

3. Remove the hydraulic pump (6) and pump holder.

4. Remove the clutch assembly (7).

• Be sure to align the center of disc and flywheel by inserting the clutch center tool (8).

• Do not allow grease and oil on the clutch disc facing.

24 to 27 N·m

2.4 to 2.8 kgf·m 18 to 20 lbf·ft

Tightening torque

Clutch cover mounting screw

(1) Cooling Fan (2) Hour Meter Cable (3) Fan Belt (4) Inlet Hose

(5) Air Cleaner (6) Hydraulic Pump (7) Clutch Assembly (8) Clutch Center Tool

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KiSC issued 06, 2012 A

[3] DISASSEMBLING AND ASSEMBLING

(1) Cylinder Head and Valves

Cylinder Head Cover

1. Remove the cylinder head cover cap nut.

2. Remove the cylinder head cover (1).

(When reassembling)

• Check to see if the cylinder head cover gasket is not defective.

Tightening torque

(1) Cylinder Head Cover

Injection Pipes

1. Loosen the screws on the pipe clamps.

2. Detach the injection pipes.

(When reassembling)

• Send compressed air into the pipes to blow out dust. Then, reassemble the pipes in the reverse order.

Tightening torque Injection pipe retaining nut

Cylinder head cover cap nut

ENGINE

7 to 8 N·m

0.7 to 0.9 kgf·m 5 to 6 lbf·ft

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25 to 34 N·m

2.5 to 3.5 kgf·m 18 to 25 lbf·ft

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Nozzle Holder Assembly and Glow Plug

1. Remove the overflow pipe assembly (6).

2. Remove the nozzle holder assemblies (2).

3. Remove the copper gasket (3) and heat seal (4).

4. Remove the lead (5) from the glow plugs.

5. Remove the glow plugs (1).

(When reassembling)

• Replace the copper gasket (3) and heat seal (4) with new one.

Nozzle holder assembly

Tightening torque

(1) Glow Plug (2) Nozzle Holder Assembly (3) Copper Gasket

Overflow pipe assembly retaining nut

Glow plug

(4) Heat Seal (5) Lead (6) Overflow Pipe Assembly

49 to 68 N·m

5.0 to 7.0 kgf·m 37 to 50 lbf·ft

20 to 24 N·m

2.0 to 2.5 kgf·m 15 to 18 lbf·ft

7.9 to 14 N·m

0.8 to 1.5 kgf·m

5.8 to 10 lbf·ft

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