Kubota B2301, B2601 Service Manual

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Page 1

B2301,B2601

WORKSHOP MANUAL

TRACTOR

KiSC issued 11, 2014 A

Page 2

TO THE READER

This Workshop Manual tells the servicing personnel about the mechanism, servicing and maintenance of the B2301 and B2601. It contains 4 parts: "Information", "General", "Mechanism" and "Servicing".

 Information

This section primarily contains information below.

• Safety First

• Safety Decal

• Specifications

• Dimensions

 General

This section primarily contains information below.

• Engine Identification

• Model Identification

• General Precautions

• Maintenance Check List

• Check and Maintenance

• Special Tools

 Mechanism

This section contains information on the structure and the function of the unit. Before you continue with the subsequent sections, make sure that you read this section.

Refer to the latest version of Workshop Manual (Code No. 9Y021-01870 / 9Y021-18200) for the diesel engine / tractor mechanism that this workshop manual does not include.

 Servicing

This section primarily contains information below.

• Troubleshooting

• Servicing Specifications

• Tightening Torques

• Checking, Disassembling and Servicing

All illustrations, photographs and specifications contained in this manual are of the newest information available at the time of publication.

KUBOTA reserves the right to change all information at any time without notice.

Since this manual includes many models, information or illustrations and photographs can show more than one model.

November, 2014

KiSC issued 11, 2014 A

Page 3

I INFORMATION

KiSC issued 11, 2014 A

Page 4

CONTENTS

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

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

3. SPECIFICATIONS.......................................................................................................................... I-7

4. TRAVELING SPEEDS.................................................................................................................... I-8

5. DIMENSIONS ................................................................................................................................. I-9

INFORMATION

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INFORMATION

B2301, B2601, WSM

I-1

1. SAFETY FIRST

WSM000001INI0001US1

BEFORE YOU START SERVICE

• Read all instructions and safety instructions in this manual and on your machine safety decals.

• Clean the work area and machine.

• Park the machine on a stable and level ground, and set the parking brake.

• Lower the implement to the ground.

• Stop the engine, then remove the key.

• Disconnect the battery negative cable.

• Hang a "DO NOT OPERATE" tag in the operator station.

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START SAFELY

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

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

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

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

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SAFETY FIRST

• This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully.

• It is essential that you read the instructions and safety regulations before you try to repair or use this unit.

DANGER

• Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

WARNING

• Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION

• Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

IMPORTANT

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

NOTE

• Gives helpful information.

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INFORMATION

B2301, B2601, WSM

I-2

OPERATE SAFELY

• Do not use the machine after you consume alcohol or medication or when you are tired.

• Put on applicable clothing and safety equipment.

• Use applicable tools only. Do not use alternative tools or parts.

• When 2 or more persons do servicing, make sure that you do it safely.

• Do not operate below the machine that only a jack holds. Always use a safety stand to hold the machine.

• Do not touch the hot parts or parts that turn when the engine operates.

• Do not remove the radiator cap when the engine operates, or immediately after it stops. If not, hot water can spout out from the radiator. Only remove the radiator cap when it is at a sufficiently low temperature to touch with bare hands. Slowly loosen the cap to release the pressure before you remove it fully.

• Released fluid (fuel or hydraulic oil) under pressure can cause damage to the skin and cause serious injury. Release the pressure before you disconnect hydraulic or fuel lines. Tighten all connections before you apply the pressure.

• Do not open a fuel system under high pressure. The fluid under high pressure that stays in fuel lines can cause serious injury. Do not disconnect or repair the fuel lines, sensors, or any other components between the fuel pump and injectors on engines with a common rail fuel system under high pressure.

• Put on an applicable ear protective device (earmuffs or earplugs) to prevent injury against loud noises.

• Be careful about electric shock. The engine generates a high voltage of more than DC100 V in the ECU and is applied to the injector.

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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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INFORMATION

B2301, B2601, WSM

I-3

KEEP A GOOD AIRFLOW IN THE WORK AREA

• If the engine is in operation, make sure that the area has good airflow. Do not operate the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.

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DISCARD FLUIDS CORRECTLY

• Do not discard fluids on the ground, down the drain, into a stream, pond, or lake. Obey related environmental protection regulations when you discard oil, fuel, coolant, electrolyte and other dangerous waste.

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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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INFORMATION

B2301, B2601, WSM

I-4

2. SAFETY DECALS

The following safety decals are installed on the machine. If a decal becomes damaged, illegible or is not

on the machine, replace it. The decal part number is listed in the parts list.

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INFORMATION

B2301, B2601, WSM

I-5

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INFORMATION

B2301, B2601, WSM

I-6

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CARE OF DANGER, WARNING AND CAUTION LABELS

1. Keep danger, warning and caution labels clean and free from obstructing material.

2. Clean danger, warning and caution labels with soap and water, dry with a soft cloth.

3. Replace damaged or missing danger, warning and caution labels with new labels.

4. If a component with danger, warning and caution label(s) affixed is replaced with new part, make sure new label(s) is (are) attached in the same location(s) as the replace component.

5. Mount new danger, warning and caution labels by applying on a clean dry surface and pressing any bubbles to outside edge.

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INFORMATION

B2301, B2601, WSM

I-7

3. SPECIFICATIONS

NOTE

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

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Model B2301 B2601

PTO power *1 17.5 kW (13.0 HP) 19.5 kW (14.5 HP)

Engine

Maker KUBOTA

Model D1005-E4-D32 D1105-E4-D32

Type E-TVCS. Liquid-cooled, 3-cylinder diesel

Number of cylinders 3

Bore and stroke 76 × 73.6 mm (3.0 × 2.9 in.) 78 × 78.4 mm (3.1 × 3.1 in.)

Total displacement 1001 cc (61.1 cu.in.) 1123 cc (68.5 cu.in.)

Engine gross power *1 22 kW (16.4 HP) 25.5 kW (19.0 HP)

Rated revolution 2800 min

-1

(rpm)

Low idling revolution 1000 to 1100 min

-1

(rpm)

Maximum torque 60 N·m (6.1 kgf· m, 44 lbf·ft) 71 N·m (7.2 kgf·m, 52 lbf·ft)

Battery 12 V, RC: 80 min, CCD: 430 A

Capacities

Fuel tank 23 L (6.1 U.S.gals, 5.1 Imp.gals)

Engine crankcase (with filter) 3.1 L (3.3 U.S.qts, 2.7 Imp.qts)

Engine coolant 3.8 L (4.0 U.S.qts, 3.3 Imp.qts)

Transmission case 15 L (4.0 U.S.gals, 3.3 Imp.gals)

Dimensions

Overall length (without 3P) 2380 mm (93.7 in.) 2410 mm (94.9 in.)

Overall width (min. tread) 1150 mm (45.3 in.) 1245 mm (49.0 in.)

Overall height 2130 mm (83.9 in.) 2160 mm (85.0 in.)

Wheel base 1560 mm (61.4 in.)

Minimum ground clearance 305 mm (12.0 in.) 325 mm (12.8 in.)

Tread

Front 800 mm (31.5 in.) 815 mm (32.1 in.)

Rear 900 mm (35.5 in.) 950 mm (37.4 in.)

Weight 710 kg (1566 lbs) 740 kg (1632 lbs)

Clutch Not applicable

Traveling system

Tires

Front 6-12 7-12

Rear 9.5-16 11.2-16

Steering Hydraulic type power steering

Transmission HST (3 range)

Brake Wet disk type

Minimum turning radius (with brake)

2.1 m (6.9 feet)

Hydraulic unit

Hydraulic control system Position Control Valve

Pump capacity 31.4 L/min (8.3 gals/min)

3-point hitch SAE Category 1

Max. lift force

At lift points 820 kg (1808 lbs)

24 in. behind lift point

640 kg (1411 lbs)

PTO

Rear-PTO SAE 1-3/8, 6 splines

PTO / Engine speed

540 min

-1

(rpm) / 2768 min-1 (rpm)

Mid-PTO USA No.5 (KUBOTA 10-tooth) involute spline

PTO / Engine speed

2500 min

-1

(rpm) / 2753 min-1 (rpm)

KiSC issued 11, 2014 A

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INFORMATION

B2301, B2601, WSM

I-8

4. TRAVELING SPEEDS

(At rated engine rpm)

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

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Model B2301HSD

Tire size (Rear) 9.5-16 Farm / 33 × 12.5-15 Turf / 12-16.5 Industry

Range gear shift

lever

km/h (mile/h)

Forward

Low 0 to 5.6 (0 to 3.5)

Middle 0 to 8.8 (0 to 5.5)

High 0 to 19.1 (0 to 11.8)

Reverse

Low 0 to 4.2 (0 to 2.6)

Middle 0 to 6.6 (0 to 4.1)

High 0 to 14.3 (0 to 8.9)

Model B2601HSD

Tire size (Rear) 11.2-16 Farm 33 × 12.5-15 Turf / 12-16.5 Industry

Range gear shift

lever

km/h (mile/h)

Forward

Low 0 to 6.0 (0 to 3.7) 0 to 5.6 (0 to 3.5)

Middle 0 to 9.5 (0 to 5.9) 0 to 8.8 (0 to 5.5)

High 0 to 20.4 (0 to 12.7) 0 to 19.1 (0 to 11.8)

Reverse

Low 0 to 4.5 (0 to 2.8) 0 to 4.2 (0 to 2.6)

Middle 0 to 7.1 (0 to 4.4) 0 to 6.6 (0 to 4.1)

High 0 to 15.3 (0 to 9.5) 0 to 14.3 (0 to 8.9)

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INFORMATION

B2301, B2601, WSM

I-9

5. DIMENSIONS

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G GENERAL

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CONTENTS

1. TRACTOR IDENTIFICATION ....................................................................................................... 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-11

[1] GENERAL USE SCREWS, BOLTS AND NUTS .................................................................. G-11

[2] STUD BOLTS ....................................................................................................................... G-11

[3] METRIC SCREWS, BOLTS AND NUTS .............................................................................. G-12

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

THREADS ............................................................................................................................ G-12

[5] PLUGS ................................................................................................................................. G-12

6. MAINTENANCE CHECK LIST ................................................................................................... G-13

7. CHECK AND MAINTENANCE ................................................................................................... G-15

[1] DAILY CHECK...................................................................................................................... G-15

[2] CHECK POINTS OF EVERY 50 HOURS ............................................................................ G-19

[3] CHECK POINTS OF EVERY 100 HOURS .......................................................................... G-21

[4] CHECK POINTS OF EVERY 200 HOURS .......................................................................... G-25

[5] CHECK POINTS OF EVERY 400 HOURS .......................................................................... G-28

[6] CHECK POINT OF EVERY 800 HOURS ............................................................................. G-30

[7] CHECK POINT OF EVERY 1500 HOURS ........................................................................... G-30

[8] CHECK POINT OF EVERY 3000 HOURS ........................................................................... G-30

[9] CHECK POINT OF EVERY 1 YEAR .................................................................................... G-30

[10]CHECK POINTS OF EVERY 2 YEARS ............................................................................... G-31

[11]OTHERS............................................................................................................................... G-33

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

....... G-35

[1]

SPECIAL TO

OLS FOR ENGINE .......................................................................................... G-35

[2] SPECIAL TOOLS FOR TRACTOR ...................................................................................... G-42

9. TIRES ......................................................................................................................................... G-45

[1] TIRE PRESSURE................................................................................................................. G-45

[2] WHEEL ADJUSTMENT........................................................................................................ G-46

(1) Front Wheels .................................................................................................................. G-46

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

[3] BALLAST.............................................................................................................................. G-50

10. IMPLEMENT LIMITATIONS ....................................................................................................... G-52

GENERAL

KiSC issued 11, 2014 A

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GENERAL

B2301, B2601, WSM

G-1

1. TRACTOR IDENTIFICATION

When contacting your local KUBOTA distributor, always specify

engine serial number, tractor serial number and hour meter reading.

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(1) Tractor Identification Plate (2) Tractor Serial Number (3) Engine Serial Number

(4) ROPS Identification Plate

(ROPS Serial Number)

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GENERAL

B2301, B2601, WSM

G-2

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.

• Clean the parts before you measure them.

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

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

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

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

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

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

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

(A) External Circlip (B) Internal Circlip

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GENERAL

B2301, B2601, WSM

G-3

3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING

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

IMPORTANT

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

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

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

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[1] WIRING

• Securely tighten wiring terminals.

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• Do not let wiring contact dangerous part.

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• Repair or change torn or aged wiring immediately.

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(1) Negative Terminal (2) Positive Terminal

(1) Correct

(Securely Tighten)

(2) Incorrect

(Loosening Leads to Faulty Contact)

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

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

(1) Aged (2) Torn

(3) Insulating Vinyl Tape

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GENERAL

B2301, B2601, WSM

G-4

• Securely insert grommet.

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• Securely clamp, being careful not to damage wiring.

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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.

WSM000001GEG0068US0

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

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

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(1) Grommet (A) Correct

(B) Incorrect

(1) Clamp

(Wind Clamp Spirally)

(2) Wire Harness

(3) Clamp (4) Welding Dent

(1) Wiring (2) Clamp

(A) Correct (B) Incorrect

(1) Wiring (A) Incorrect

(1) Cover

(Securely Install Cover)

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GENERAL

B2301, B2601, WSM

G-5

[2] BATTERY

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

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

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

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

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

DANGER

To avoid serious injury or death:

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

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

• Before you recharge, remove cell caps.

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

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[3] FUSE

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

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

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

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

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[4] CONNECTOR

• For connector with lock, push lock to separate.

WSM000001GEG0073US0

• In separating connectors, do not pull wire harnesses.

• Hold connector bodies to separate.

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(1) Fuse (2) Fusible Link

(3) Slow Blow Fuse

(A) Push

(A) Correct (B) Incorrect

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GENERAL

B2301, B2601, WSM

G-6

• Use sandpaper to remove rust from terminals.

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

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

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

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[5] HANDLING OF CIRCUIT TESTER

• Use tester correctly following manual provided with tester.

• Check for polarity and range.

WSM000001GEG0078US0

(1) Exposed Terminal (2) Deformed Terminal

(3) Sandpaper (4) Rust

(A) Correct (B) Incorrect

(1) Cover (A) Correct

(B) Incorrect

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GENERAL

B2301, B2601, WSM

G-7

[6] COLOR OF WIRING

• 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

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Color of wiring Color code

Black B

Brown Br

Green G

Gray Gy or Gr

Blue L

Light Green Lg

Orange Or

Pink P

Purple Pu or V

Red R

Sky Blue Sb

White W

Yell ow Y

(1) Wire Color (2) Stripe

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GENERAL

B2301, B2601, WSM

G-8

4. LUBRICANTS, FUEL AND COOLANT

NOTE

• *KUBOTA UDT or SUPER UDT fluid --- KUBOTA original transmission hydraulic fluid

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No. Place

Capacity

Lubricants, fuel and coolant

B2301 B2601

1 Fuel tank

23 L

6.1 U.S.gals

5.1 Imp.gals

• No. 2-D diesel fuel

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

Coolant (with recovery tank)

3.8 L

4.0 U.S.qts

3.3 Imp.qts

Fresh clean soft water with anti-freeze

Engine crankcase (with filter)

3.1 L

3.3 U.S.qts

2.7 Imp.qts

Engine oil: Refer to next page

• Above 25 °C (77 °F) SAE30, SAE10W-30 or 15W-40

• −10 to 25 °C (14 to 77 °F) SAE20, SAE10W-30 or 15W-40

• Below −10 °C (14 °F) SAE10W-30

4 Transmission case

15 L

4.0 U.S.gals

3.3 Imp.gals

KUBOTA SUPER UDT-2 fluid*

5 Front axle case

3.5 L

3.7 U.S.qts

3.1 Imp.qts

KUBOTA SUPER UDT-2 fluid* or SAE80 - SAE90 gear oil

Greasing No. of greasing point Capacity Type of grease

5. TIGHTENING TORQUES

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

according to the table below.

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[1] GENERAL USE SCREWS, BOLTS AND NUTS

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[2] STUD BOLTS

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Indication on top of bolt

No-grade or 4T 7T 9T

Indication on top of nut

No-grade or 4T

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 to

9.3

0.80 to

0.95

5.8 to

6.8

7.9 to

8.8

0.80 to

0.90

5.8 to

6.5

9.81 to

11. 2

1.00 to

1.15

7.24 to

8.31

7.9 to

8.8

0.80 to

0.90

5.8 to

6.5

12.3 to

14.2

1.25 to

1.45

9.05 to

10.4

1.8 to

2.1

1.7 to

2.0

2.4 to

2.8

1.8 to

2.1

3.0 to

3.5

M10

4.0 to

4.6

3.2 to

3.5

4.9 to

5.7

4.0 to

4.5

6.2 to

7.2

M12

6.4 to

7.4

to 53–––

7.9 to

9.2

6.4 to

7.4

103

117

10.5 to

12.0

76.0 to

86.7

M14

108

125

11. 0 to

12.8

79.6 to

92.5

–––

124

147

12.6 to

15.0

91.2 to

108

–––

196

17.0 to

20.0

123

144

M16

167

191

17.0 to

19.5

123

–––

197

225

20.0 to

23.0

145

166

–––

260

304

26.5 to

31.0

192

224

M18

246

284

25.0 to

29.0

181

209

–––

275

318

28.0 to

32.5

203

235

–––

344

402

35.0 to

41.0

254

296

M20

334

392

34.0 to

40.0

246

289

–––

368

431

37.5 to

44.0

272

318

–––

491

568

50.0 to

58.0

362

419

Material of opponent part Ordinariness Aluminum

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

1.2 to

1.6

8.7 to

8.9 to

0.90 to

1.2

6.5 to

8.6

M10

2.5 to

3.2

2.0 to

2.6

M12

3.0 to

5.0

to 3631 3.2 23

M14

6.3 to

7.5

to 54–––

M16

98.1 to

112

10.0 to

11. 5

72.4 to

83.1

–––

M18

172

201

17.5 to

20.5

127

148

–––

KiSC issued 11, 2014 A

Page 27

GENERAL

B2301, B2601, WSM

G-12

[3] METRIC SCREWS, BOLTS AND NUTS

WSM000001GEG0003US0

[4] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH

UNC OR UNF THREADS

WSM000001GEG0008US0

[5] PLUGS

WSM000001GEG0005US0

Grade

Property class 8.8 Property class 10.9

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

Grade

SAE GR.5 SAE GR.8

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

Shape Size

Material of opponent part

Ordinariness Aluminum

N·m kgf·m lbf·ft N·m kgf·m lbf·ft

Tapered screw

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

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

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 – – –

KiSC issued 11, 2014 A

Page 28

GENERAL

B2301, B2601, WSM

G-13

6. MAINTENANCE CHECK LIST

No. Item

Indication on hour meter

Interval

Refer-

ence page

50 100 150 200 250 300 350 400 450 500 550 600 650 700 800

1 Engine oil Change 

every

200 Hr

G-26

2 Engine oil filter Replace 

every

200 Hr

G-25

3 Transmission oil filters [HST] Replace 

every

200 Hr

G-26

4 Hydraulic oil filter Replace 

every

400 Hr

G-29

5 Transmission fluid Change 

every

400 Hr

G-28

6 Front axle case oil Change 

every

400 Hr

G-29

7 Front axle pivot Adjust 

every

400 Hr

G-30

8 Engine start system Check 

every 50 Hr

G-19

9 Greasing – 

every 50 Hr

G-20

10 Wheel bolt torque Check 

every 50 Hr

G-20

11 Battery condition Check 

every

100 Hr

G-21 *4

Air cleaner element [Double element type] Primary element

Clean 

every

100 Hr

G-23 *1

Replace

every 1

year

G-30 *2

Air cleaner element [Double element type] Secondary element

Replace

every 1

year

G-30

13 Fuel filter element

Clean 

every

100 Hr

G-24

Replace 

every

400 Hr

G-30

14 Fan belt Adjust 

every

100 Hr

G-24

15 Brake Adjust



every

100 Hr

G-25

16 Radiator

hose and clamp

Check 

every

200 Hr

G-27

Replace

every 2

years

G-33

17 Fuel line

Check 

every

100 Hr

G-25

Replace

every 2

years

G-33 *3

18 Intake air line

Check 

every

200 Hr

G-27

Replace

every 2

years

G-33 *3

19 Toe-in Adjust 

every

200 Hr

G-28

20 Engine valve clearance Adjust 

every

800 Hr

G-30

Fuel injection nozzle injection pressure

Check

every

1500 Hr

G-30 @

22 Injection pump Check

every

3000 Hr

G-30 @

23 Cooling system Flush

every 2

years

G-31

KiSC issued 11, 2014 A

Page 29

GENERAL

B2301, B2601, WSM

G-14

IMPORTANT

• The jobs indicated by  must be done after the first 50 hours of operation. *1 Air cleaner should be cleaned more often in severe 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.

• The items listed above (@ marked) are registered as emission related critical parts by KUBOTA in the U.S.EPA nonroad emission regulation. As the engine owner, you are responsible for the performance of the required maintenance on the engine according to the above instruction. Please see the Warranty Statement in detail.

9Y1211156GEG0004US0

24 Coolant Change

every 2

years

G-31

25 Fuel system Bleed

Service

as re-

quired

G-33

26 Clutch housing water Drain G-33

27 Fuse Replace G-34

28 Light bulb Replace G-34

No. Item

Indication on hour meter

Interval

Refer-

ence page

50 100 150 200 250 300 350 400 450 500 550 600 650 700 800

KiSC issued 11, 2014 A

Page 30

GENERAL

B2301, B2601, WSM

G-15

7. CHECK AND MAINTENANCE

[1] DAILY CHECK

WARNING

To avoid personal injury or death: Take the following precautions when checking the tractor.

• Park the machine on firm and level ground.

• Set the parking brake.

• Lower the implement to the ground.

• All residual pressure of the hydraulic system released.

• Stop the engine and remove the key.

9Y1211156GEG0005US0

Walk Around Inspection

1. Look around and under the tractor for such items as loose bolts, trash build-up, oil or coolant leaks, broken or worn parts.

9Y1211156GEG0006US0

Checking and Refueling

WARNING

To avoid personal injury or death:

• Do not smoke while refueling.

• Be sure to stop the engine before refueling.

1. Turn the key switch to "ON", check the amount of fuel by fuel gauge.

2. Fill fuel tank when fuel gauge shows 1/4 or less fuel in tank.

3. Use grade No.2-Diesel fuel at temperatures above −10 °C (14 °F). Use grade No.1-Diesel fuel at temperatures below −10 °C (14 °F).

IMPORTANT

• Do not permit dirt or trash to get into the fuel system.

• Be careful not to let the fuel tank become empty, otherwise air will enter the fuel system, necessitating bleeding before next engine start.

• Be careful not to spill during refueling. If you should spill, wipe it off at once, or it may cause a fire.

• To prevent condensation (water) accumulation in the fuel tank, fill the tank before parking overnight.

9Y1211156GEG0007US0

Fuel tank capacity

23 L

6.1 U.S.gals

5.1 Imp.gals

(1) Fuel Tank Cap

KiSC issued 11, 2014 A

Page 31

GENERAL

B2301, B2601, WSM

G-16

Checking Engine Oil Level

WARNING

To avoid personal injury:

• Be sure to stop the engine before checking the oil level.

1. Park the machine on a flat surface.

2. Check engine oil before starting the engine or 5 minutes or more after the engine has stopped.

3. To check the oil level, draw out the dipstick, wipe it clean, replace it, and draw it out again. Check to see that the oil level lies between the two notches. If the level is too low, add new oil to the prescribed level at the oil inlet.

IMPORTANT

• When using an oil of different maker or viscosity from the previous one, remove all of the old oil. Never mix two different types of oil.

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

9Y1211156GEG0008US0

Checking Transmission Fluid Level

1. Park the machine on a flat surface, lower the implement and shut off engine.

2. To check the oil level, draw out the dipstick, wipe it clean, replace it, and draw it out again. check to see that the oil level lies within the cross hatched area. If the level it too low, add new oil to the prescribed level at the oil inlet.

IMPORTANT

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

9Y1211156GEG0009US0

Checking Coolant Level

WARNING

To avoid personal injury or death:

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

1. Check to see that the coolant level is between the "FULL" and "LOW" makes of recovery tank.

2. When the coolant level drops due to evaporation, add soft water only up to the full level. In case of leakage, add anti-freeze and soft water in the specified mixing ratio up to the full level.

IMPORTANT

• If the radiator cap has to be removed, follow the caution above and securely retighten the cap.

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

9Y1211156GEG0010US0

(1) Oil Inlet (2) Dipstick

A: Oil level is acceptable within this

range.

(1) Oil Inlet (2) Dipstick

A: Oil level is acceptable within this

range.

(1) Recovery Tank A: "FULL"

B: "LOW"

KiSC issued 11, 2014 A

Page 32

GENERAL

B2301, B2601, WSM

G-17

Cleaning Evacuator Valve

1. Open the evacuator valve to get rid of large particles of dust and dirt.

9Y1211156GEG0011US0

Cleaning Grill and Radiator Screen

WARNING

To avoid personal injury or death:

• Be sure to stop the engine and remove the key before removing the screen.

1. Check front grill and side screens to be sure they are clean of debris.

2. Detach the screen and remove all foreign material and clean the front of radiator completely.

IMPORTANT

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

9Y1211156GEG0012US0

Checking Brake Pedal

1. Inspect the brake pedals for free travel, and smooth operation.

2. Adjust if incorrect measurement is found.

9Y1211156GEG0013US0

Checking Gauges, Meter and Easy Checker™

1. Inspect the instrument panel for broken gauge(s), meter(s) and Easy Checker™.

2. Replace if broken.

9Y1211156GEG0014US0

Checking Head Light, Hazard Light etc.

1. Inspect the light for broken bulbs and lenses.

2. Replace if broken.

9Y1211156GEG0015US0

Checking Seat Belt and ROPS

1. Always check condition of seat belt and ROPS attaching hardware before operating tractor.

2. Replace if damaged.

9Y1211156GEG0016US0

(1) Evacuator Valve

(1) Radiator Screen (A) "DETACH"

KiSC issued 11, 2014 A

Page 33

GENERAL

B2301, B2601, WSM

G-18

Checking and Cleaning of Electrical Wiring and Battery Cables

WARNING

To avoid personal injury or death:

• A loosened terminal or connector, or damaged wire may affect the performance of electrical components or cause short circuits. Leakage of electricity could result in a fire hazard, a dead battery or damage to electrical components.

• Replace damaged wires or connections promptly.

• If a fuse blows soon after replacement, DO NOT USE A LARGER THAN RECOMMENDED FUSE OR BYPASS THE FUSE SYSTEM.

• Many wiring connections are protected by waterproof plugs, plug and unplug these connections carefully and make sure they are sealed correctly after assembly.

• Accumulation of dust, chaff or spilled fuel deposits around the battery, electrical wiring, engine or exhaust system are a fire hazard. CLEAN THESE AREAS BEFORE STARTING WORK. To avoid premature electrical malfunctions DO NOT APPLY high pressure water directly to battery, wiring, connectors, electrical components or instrument panel.

Inspect the following regularly:

1. Check wiring for chafed or cracked insulation.

2. Check wiring harness clamps. Replace if necessary.

3. Check connectors and terminals for looseness, contamination or overheated (discolored) connectors.

4. Check instrument panel for correct operation of switches and gauges.

9Y1211156GEG0017US0

Checking Movable Parts

1. If any of the movable parts, such as levers and pedals, is not smoothly moved because of rust or anything sticky, do not attempt to force it into motion. In the above case, remove the rust or sticky thing, and apply oil lor grease on the relevant spot. Otherwise, the machine may get damaged.

9Y1211156GEG0018US0

KiSC issued 11, 2014 A

Page 34

GENERAL

B2301, B2601, WSM

G-19

[2] CHECK POINTS OF EVERY 50 HOURS

Checking Engine Start System

WARNING

To avoid personal injury or death:

• Do not allow anyone near the tractor while testing.

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

• Detach an implement before testing.

 Preparation before testing.

1. Sit on operator's seat.

2. Set the parking brake and stop the engine.

3. Shift the range gear shift lever to "NEUTRAL" position.

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

5. Shift the PTO clutch lever to "OFF" position.

 Test: Switch for the speed control pedal.

1. Depress the speed control pedal.

2. Turn the key to "START" position.

3. The engine must not crank.

 Test: Switch for the PTO clutch lever.

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

2. Shift the PTO clutch lever to "ON" position.

3. Turn the key to "START" position.

4. The engine must not crank.

 Test: Switches for the operator's seat and the PTO clutch

lever.

1. Sit on the operator's seat.

2. Start the engine.

3. Shift the PTO clutch lever to "ON" position.

4. Release the parking brake.

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

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

9Y1211156GEG0019US0

(1) Range Gear Shift Lever (2) PTO Clutch Lever

(3) Speed Control Pedal (4) Operator's Seat

KiSC issued 11, 2014 A

Page 35

GENERAL

B2301, B2601, WSM

G-20

Lubricating Grease Fittings

1. Apply a small amount of multipurpose grease to the following points every 50 hours: If you operated the machine in extremely wet and muddy conditions, lubricate grease fittings more often.

9Y1211156GEG0020US0

Checking Wheel Mounting Nuts Tightening Torque

WARNING

To avoid personal injury or death:

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

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

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

1. Check wheel bolts and nuts regularly especially when new. If they are loose, tighten them as follows.

9Y1211156GEG0021US0

(1) Grease Fitting (Brake Pedals) (2) Grease Fitting (Top Link)

(3) Grease Fitting (Lifting Rod, Right) (4) Battery Terminals

Tightening torque

Front wheel mounting nut

78 to 90 N·m

8.0 to 9.1 kgf·m 58 to 66 lbf·ft

Rear wheel mounting nut

145 to 150 N·m

14.8 to 15.2 kgf·m 107 to 110 lbf·ft

(1) Front Wheel Mounting Nut (2) Rear Wheel Mounting Nut and Bolt

KiSC issued 11, 2014 A

Page 36

GENERAL

B2301, B2601, WSM

G-21

[3] CHECK POINTS OF EVERY 100 HOURS

Checking Battery Condition

DANGER

To avoid the possibility or 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.

WARNING

To avoid personal injury or death:

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

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

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

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

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

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

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

 How to read the indicator

Check the battery condition by reading the indicator.

9Y1211156GEG0022US0

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

State of indicator display

Green

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

Black Needs charging battery.

White Needs replacing battery.

(1) Battery (2) Indicator

KiSC issued 11, 2014 A

Page 37

GENERAL

B2301, B2601, WSM

G-22

Battery Charging

WARNING

To avoid personal injury or death:

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

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

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

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

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

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

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

4. When exchanging an old battery into new one, use battery of equal specification shown in table 1.

Tab le 1

 Direction for Storage

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

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

9Y1211156GEG0023US0

Battery

Typ e

Volt (V)

Capacity

at 5 H.R.

Reserve at (min.)

Cold Cranking Amps (A)

Normal

Charging

Rate (A)

55B24L

(S)-MF

12 36 80 430 4.5

(1) Battery

KiSC issued 11, 2014 A

Page 38

GENERAL

B2301, B2601, WSM

G-23

Cleaning Air Cleaner Primary Element [Double Element Type]

WARNING

To avoid personal injury or death:

• Be sure to stop the engine and remove the key before cleaning air filter element.

1. Remove the air cleaner cover and primary element.

2. Clean the primary element: a) 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).

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

NOTE

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

IMPORTANT

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

• Do not run the engine with filter element removed.

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

• Do not touch the secondary element except in cases where replacing is required. (See "Replacing Air Cleaner Primary Element and Secondary Element" in "EVERY 1 YEAR".)

 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.

9Y1211156GEG0025US0

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

(3) Cover (4) Evacuator Valve

KiSC issued 11, 2014 A

Page 39

GENERAL

B2301, B2601, WSM

G-24

Cleaning Fuel Filter

WARNING

To avoid personal injury or death:

• Stop the engine and remove the key before checking fuel lines and fuel filter.

• Check the fuel lines periodically. The fuel lines are subject to wear and aging. Fuel may leak out onto the running engine, causing a fire.

• Protect your hands when using kerosene to clean components.

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

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

2. Take out the element 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 "SERVICE AS REQUIRED".)

IMPORTANT

• 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 checking, make sure the fuel tank is less than half-full.

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

9Y1211156GEG0026US0

Adjusting Fan Belt Tension

WARNING

To avoid personal injury or death:

• 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 dynamo mounting bolts and, using a lever placed between the dynamo and the engine block, pull the dynamo out until the deflection of the belt falls within acceptable limits.

4. Replace fan belt if it is damaged.

9Y1211156GEG0027US0

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

(A) Loosen (B) Tighten

Fan belt tension Factory specification

A deflection of between

7.0 to 9.0 mm (0.28 to 0.35 in.) when the belt is pressed in the middle of the span.

(1) Bolt (A) Check the belt tension

(B) To Tighten

KiSC issued 11, 2014 A

Page 40

GENERAL

B2301, B2601, WSM

G-25

Adjusting Brake Pedal

WARNING

To avoid personal injury or death:

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

1. Release the parking brake.

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

3. If adjustment is needed, turn the lock nut and adjust nut, adjust free travel.

4. Retighten the lock nut.

9Y1211156GEG0028US0

Checking Fuel Line

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

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

NOTE

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

9Y1211156GEG0029US0

[4] CHECK POINTS OF EVERY 200 HOURS

Replacing Engine Oil Filter

WARNING

To avoid personal injury or death:

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

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

1. Remove the oil filter.

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

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

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

IMPORTANT

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

9Y1211156GEG0030US0

Proper brake pedal free travel

30 to 40 mm (1.2 to 1.5 in.) on the pedal Keep the free travel in the right and left brake pedals equal.

(1) Lock Nut (Both Sides) (2) Turnbuckle (Both Sides)

A: Free Travel

(1) Fuel Hoses (2) Hose Clamps

(1) Engine Oil Filter

KiSC issued 11, 2014 A

Page 41

GENERAL

B2301, B2601, WSM

G-26

Changing Engine Oil

WARNING

To avoid personal injury or death:

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

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

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

2. After draining reinstall the drain plug.

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

9Y1211156GEG0031US0

Replacing Transmission Oil Filter [HST]

WARNING

To avoid personal injury or death:

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

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

1. Place the oil pan underneath the transmission oil filter and remove the filter. Do not remove the hydraulic oil filter. Otherwise, the oil comes out.

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

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

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

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

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

IMPORTANT

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

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

9Y1211156GEG0032US0

Oil capacity with filter

3.1 L

3.3 U.S.qts

2.7 Imp.qts

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

A: Oil level is acceptable within this

range

(1) Transmission Oil Filter [HST] (2) Oil Inlet (3) Dipstick

A: Oil level is acceptable within this

range

KiSC issued 11, 2014 A

Page 42

GENERAL

B2301, B2601, WSM

G-27

Checking Intake Air Line

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

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

9Y1211156GEG0033US0

Checking Radiator Hose and Hose Clamp

WARNING

To avoid personal injury or death:

• Be sure to stop the engine and remove the key before checking radiator hose and clamp.

• Allow engine and coolant to cool down sufficiently before checking.

Check to see if radiator hoses are properly fixed every

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

1. If hose clamps are loose or water leaks, tighten bands securely.

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

 Precaution at Overheating

Take the following actions in the event the coolant temperature

is 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.

9Y1211156GEG0034US0

(1) Hose (2) Hose Clamp

(1) Radiator Hose (2 Hoses) (2) Clamp (4 Clamps)

KiSC issued 11, 2014 A

Page 43

GENERAL

B2301, B2601, WSM

G-28

Adjusting Toe-in

1. Park tractor on a flat place.

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

3. Lower the implement, lock the park brake and stop the engine.

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

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

6. Front distance should be 0 to 10 mm (0 to 0.39in.) less than rear distance. If not, adjust tie-rod length.

 Adjusting procedures

1. Loosen the tie-rod nut.

2. Turn the tie-rod to adjust the rod length until the proper toe-in measurement is obtained.

3. Retighten the tie-rod nut.

9Y1211156GEG0035US0

[5] CHECK POINTS OF EVERY 400 HOURS

Changing Transmission Fluid

WARNING

To avoid personal injury or death:

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

1. To drain the used oil, remove the drain plug at the bottom of the transmission case and drain the oil completely into the oil pan.

2. After draining reinstall the drain plug.

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

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

5. Properly dispose of used oil.

IMPORTANT

• 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.

• Do not operate the tractor immediately after changing the transmission fluid.

9Y1211156GEG0037US0

(1) Tie-rod Nut (2) Tie-rod

(A) Wheel-to-wheel distance at rear (B) Wheel-to-wheel distance at front (C) "FRONT"

Oil capacity

15 L

4.0 U.S.gals

3.3 Imp.gals

(1) Oil Inlet (2) Dipstick (3) Drain Plug (4) Drain Plug (Both Sides)

A: Oil level is acceptable within this

range

KiSC issued 11, 2014 A

Page 44

GENERAL

B2301, B2601, WSM

G-29

Replacing Hydraulic Oil Filter

WARNING

To avoid personal injury or death:

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

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

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

2. After draining reinstall the drain plugs.

3. Remove the oil filter.

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

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

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

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

8. Make sure that the transmission fluid does not leak past the seal on the filter.

IMPORTANT

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

9Y1211156GEG0038US0

Changing Front Axle Case Oil

1. Park the tractor on a firm, flat and level surface.

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

3. After draining, reinstall the drain plugs.

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

IMPORTANT

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

5. After filling, reinstall the filling plug.

6. Properly dispose of used oil.

9Y1211156GEG0039US0

(1) Drain Plug (2) Drain Plug (Both Sides) (3) Transmission Oil Filter (4) Oil Inlet (5) Dipstick

A: Oil level is acceptable within this

range.

Oil capacity

3.5 L

3.7 U.S.qts

3.1 Imp.qts

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

A: Oil level is acceptable within this

range.

KiSC issued 11, 2014 A

Page 45

GENERAL

B2301, B2601, WSM

G-30

Adjusting Front Axle Pivot [4WD]

WARNING

To avoid personal injury or death:

• Park the tractor on a flat place.

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

1. If the front axle pivot pin adjustment is not correct, front wheel vibration can occur causing vibration in the steering wheel.

 Adjusting procedure

1. Loosen the lock nut, and tighten the adjusting screw so that the oscillating load is 50 to 100 N (5.1 to 10.2 kgf, 11.2 to 22.5 lbf). (If the adjusting screw is tightened, loosened and retightened, apply liquid gasket to its tip.)

2. Retighten the lock nut.

9Y1211156GEG0040US0

Replacing Fuel Filter Element

• See page G-24.

9Y1211156GEG0041US0

[6] CHECK POINT OF EVERY 800 HOURS

Adjusting Engine Valve Clearance

• See page 1-S13.

9Y1211156GEG0042US0

[7] CHECK POINT OF EVERY 1500 HOURS

Checking Fuel Injection Nozzle Injection Pressure

• See page 1-S19.

9Y1211156GEG0043US0

[8] CHECK POINT OF EVERY 3000 HOURS

Checking Injection Pump

• See page 1-S30.

9Y1211156GEG0044US0

[9] CHECK POINT OF EVERY 1 YEAR

Replacing Air Cleaner Primary Element and Secondary Element

• See page G-23.

IMPORTANT

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

9Y1211156GEG0046US0

(1) Adjusting Screw (2) Lock Nut

KiSC issued 11, 2014 A

Page 46

GENERAL

B2301, B2601, WSM

G-31

[10] CHECK POINTS OF EVERY 2 YEARS

Flushing Cooling System and Changing Coolant

WARNING

To avoid personal injury or death:

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

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

2. To drain the coolant, disconnect the radiator hose (engine side) and remove the radiator cap. The radiator cap must be removed to completely drain the coolant.

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

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. Install the radiator cap securely.

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

8. Start and operate the engine for few minutes.

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

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

11. Properly dispose of used coolant.

IMPORTANT

• 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.

(To be continued)

Coolant capacity (with recover tank)

3.8 L

4.0 U.S.qts

3.3 Imp.qts

(1) Radiator Hose (2) Radiator Cap (3) Recovery Tank

A: FULL B: LOW

KiSC issued 11, 2014 A

Page 47

GENERAL

B2301, B2601, WSM

G-32

(Continued)

 Anti-Freeze

WARNING

To avoid personal injury or death:

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

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

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

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

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

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

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

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

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

in KUBOTA engines.

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

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

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

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

*At 1.013 × 105 Pa (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.

(To be continued)

Vol % Anti-freeze

Freezing Point Boiling Point*

°C °F °C °F

50 −37 −34 108 226

KiSC issued 11, 2014 A

Page 48

GENERAL

B2301, B2601, WSM

G-33

(Continued)

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

evaporation.

b) 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.

NOTE

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

9Y1211156GEG0047US0

Replacing Radiator Hoses (Water Pipes)

• See page G-27.

9Y1211156GEG0048US0

Replacing Fuel Hoses

• See page G-25.

9Y1211156GEG0049US0

Replacing Intake Air Hoses

• See page G-27.

9Y1211156GEG0050US0

[11] OTHERS

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.

9Y1211156GEG0052US0

Draining Clutch Housing Water

NOTE

• 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 and drain the water, then install the plug again.

9Y1211156GEG0053US0

(1) Water Drain Plug

KiSC issued 11, 2014 A

Page 49

GENERAL

B2301, B2601, WSM

G-34

Replacing Fuse

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

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

IMPORTANT

• 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.

Protected circuit

9Y1211156GEG0054US0

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.

9Y1211156GEG0055US0

Fuse No. Capacity (A) Protected circuit

(1) 15 Flasher / Hazard

(2) 30 Solenoid

(3) 10 Outlet (Right side)

(4) 10 Head light / Panel

(5) 5 Work light

(6) 5 Glow lamp

(7)

Slow blow

fuse

Check circuit against wrong battery connection

Light Capacity

Head light 23 W

Tail light / Turn signal 21 W / 5 W

Hazard light / Turn signal 32 CP

KiSC issued 11, 2014 A

Page 50

GENERAL

B2301, B2601, WSM

G-35

8. SPECIAL TOOLS

[1] SPECIAL TOOLS FOR ENGINE

Special Use Puller Set

Code No.

• 07916-09032

Application

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

WSM000001GEG0011US0

Piston Ring Compressor

Code No.

• 07909-32111

Application

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

WSM000001GEG0012US0

Piston Ring Tool

Code No.

• 07909-32121

Application

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

WSM000001GEG0013US0

Diesel Engine Compression Tester (for Glow Plug)

Code No.

• 07909-39081 (Assembly)

• 07909-31291 (K)

• 07909-31301 (L)

• 07909-31311 (M)

Application

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

WSM000001GEG0096US0

(1) Gauge (2) Hose Assembly (3) L Joint

(4) Adaptor K (5) Adaptor L (6) Adaptor M

KiSC issued 11, 2014 A

Page 51

GENERAL

B2301, B2601, WSM

G-36

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.

WSM000001GEG0014US0

Oil Pressure Tester

Code No.

• 07916-32032

Application

• Use to measure lubricating oil pressure.

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.

WSM000001GEG0017US0

(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

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

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

(1) Adaptor

KiSC issued 11, 2014 A

Page 52

GENERAL

B2301, B2601, WSM

G-37

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

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 to remove the flywheel with ease.

WSM000001GEG0018US0

KiSC issued 11, 2014 A

Page 53

GENERAL

B2301, B2601, WSM

G-38

NOTE

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

WSM000001GEG0026US0

Valve Guide Replacing Tool

Application

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

NOTE

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

9Y1211156GEG0056US0

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 0.469 in. dia.)

F 6.50 to 6.60 mm dia. (0.256 to 0.260 in. dia.)

G 25 mm (0.98 in.)

H 6.70 to 7.00 mm dia. (0.264 to 0.276 in. dia.)

I 5 mm (0.2 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 0.3 mm (0.01 in.)

KiSC issued 11, 2014 A

Page 54

GENERAL

B2301, B2601, WSM

G-39

Injection Pump Pressure Tester

Application

• Use to check fuel tightness of injection pumps.

NOTE

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

9Y1211156GEG0057US0

Flywheel Stopper

Application

• Use to loosen and tighten the flywheel screw.

NOTE

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

9Y1211156GEG0058US0

Pressure gauge full scale: More than 29.4 MPa (300 kgf/cm

, 4267 psi)

B Copper gasket

C Flange (Material: Steel)

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

E Injection pipe

F PF 1/2

G 5 mm (0.2 in.)

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

I 8 mm dia. (0.3 in. dia.)

J 1.0 mm (0.039 in.)

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

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

M 8 mm (0.3 in.)

N 4 mm (0.2 in.)

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

P PF 1/2

Q 23 mm (0.91 in.)

R 17 mm (0.67 in.)

S 4 mm (0.2 in.)

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

U 100 mm (3.94 in.)

V M12 × 1.5

a Adhesive application

b Fillet welding on the enter circumference

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 mm (0.3 in.)

F 200 mm (7.87 in.)

KiSC issued 11, 2014 A

Page 55

GENERAL

B2301, B2601, WSM

G-40

Crankshaft Bearing 1 Replacing Tool

Application

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

NOTE

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

[1] Extracting tool

[2] Inserting tool

9Y1211156GEG0059US0

Bushing Replacing Tool

Application

• Use to press out and press in the bushing.

1. For small end bushing

2. For idle gear bushing

9Y1211156GEG0060US0

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 20 mm (0.79 in.)

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

G 56.80 to 56.90 mm dia. (2.237 to 2.240 in. dia.)

H 51.80 to 51.90 mm dia. (2.040 to 2.043 in. dia.)

A 130 mm (5.12 in.)

B 72 mm (2.8 in.)

C 40 mm radius (1.6 in. radius)

D 9 mm (0.4 in.)

E 24 mm (0.2 in.)

F 20 mm (0.79 in.)

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

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

I 51.80 to 51.90 mm dia. (2.040 to 2.043 in. dia.)

J 56.80 to 56.90 mm dia. (2.237 to 2.240 in. dia.)

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.)

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.)

KiSC issued 11, 2014 A

Page 56

GENERAL

B2301, B2601, WSM

G-41

Socket

Application

• Use to loosen and tighten the idle gear 2 bearing lock nut.

NOTE

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

9Y1211156GEG0061US0

A 28.5 to 28.8 mm (1.12 to 1.13 in.)

B 3.5 to 3.7 mm (0.14 to 0.15 in.)

C 28.5 to 28.8 mm (0.12 to 1.13 in.)

D 38 mm dia. (1.50 in. dia.)

E 28.5 to 29.0 mm dia. (1.12 to 1.14 in. dia.)

F 47.5 mm (1.87 in.)

G 17.5 mm (0.69 in.)

H 30 mm (1.18 in.)

I 18 mm dia. (0.71 in. dia.)

J 24.5 mm dia. (0.96 in. dia.)

K 5.0 mm (0.21 in.)

L 16 mm (0.63 in.)

M 12.8 to 13.0 mm (0.50 to 0.51 in.)

C1 Chamfer 1.0 mm (0.039 in.)

R5 5.0 mm radius (0.20 in. radius)

KiSC issued 11, 2014 A

Page 57

GENERAL

B2301, B2601, WSM

G-42

[2] SPECIAL TOOLS FOR TRACTOR

Tie-rod End Lifter

Code No.

• 07909-39051

Application

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

WSM000001GEG0029US0

Toe-in Gauge

Code No.

• 07909-31681

Application

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

WSM000001GEG0034US0

Relief Valve Pressure Tester

Code No.

• 07916-50045

Application

• This allows easy measurement of relief set pressure.

WSM000001GEG0027US0

Flow Meter

Code No.

• 07916-52791 (Flow Meter)

• 07916-52651 (Hydraulic Test Hose)

Application

• This allows easy testing of hydraulic system.

WSM000001GEG0036US0

Steering Wheel Puller

Code No.

• 07916-51090

Application

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

WSM000001GEG0030US0

(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)

(1) Flow Meter (2) Hydraulic Test Hose

KiSC issued 11, 2014 A

Page 58

GENERAL

B2301, B2601, WSM

G-43

Injector CH3

Code No.

• 07916-52501

Application

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

WSM000001GEG0031US0

PTO Shift Arm Ball Guide

Application

• Use for compressing the ball and spring into the transmission case.

9Y1211156GEG0062US0

Independent PTO Clutch Spring Compression Tool

Application

• Use for compressing the spring into the spline boss.

9Y1211156GEG0063US0

A 0.51 rad (30 °)

B 29.95 to 29.98 mm dia. (1.179 to 1.180 in. dia.)

C 35 mm (1.38 in.)

D 20 mm (0.79 in.)

C1 Chamfer 1 mm (0.039 in.)

(1) PTO Shift Arm Ball Guide

A 12 mm (0.47 in.)

B 25.4 mm (1.00 in.)

C 19 mm radius (0.75 in.) Hex.

D 2.7 mm (0.11 in.)

E 8 mm (0.3 in.)

F 15 mm dia. (0.59 in. dia.)

G 37 mm (1.5 in.)

H 70 mm (2.76 in.)

I M14 ×1.5

J R 3.0 mm (0.12 in.)

K 30 mm (1.18 in.)

L 17 mm (0.67 in.)

M 38 mm (1.50 in.)

KiSC issued 11, 2014 A

Page 59

GENERAL

B2301, B2601, WSM

G-44

Check and High Pressure Relief Valve Assembly Tool

Application

• Use for readjusting relief valve pressure.

9Y1211156GEG0064US0

A 30.0 mm (1.18 in.) N Chamfer 0.4 mm (0.12 in.) a 1.05 rad (60.0 °)

B 21.0 mm (0.827 in.) O Chamfer 3.0 mm (0.12 in.) b Chamfer 0.3 mm (0.01 in.)

C 1 mm (0.04 in.) P Chamfer 2.0 mm (0.079 in.) c 23.0 mm (0.906 in.)

D 0.52 rad (30 °) Q 21.4 mm (0.843 in.) d 10.0 mm (0.394 in.)

E 50.0 mm dia. (1.97 in. dia.) R 19.0 mm (0.748 in.) e 1 mm (0.039 in.)

F 10.0 mm dia. (0.39 in. dia.) S 17.0 mm (0.669 in.) f 6.5 mm (0.26 in.)

9.10 to 9.30 mm dia. (0.359 to 0.366 in.)

T 10.0 mm (0.394 in.) g Chamfer 0.5 mm (0.02 in.)

H 34.0 mm dia. (1.34 in. dia.) U 50.0 mm dia. (1.97 in. dia.) h 11.1 to 11.3 mm (0.437 to 0.444 in.)

I M36 x 1.5 mm Pitch V 9.8 mm dia. (0.39 in. dia.) i 18.8 to 19.0 mm (0.741 to 0.748 in.)

J 10.0 mm (0.39 in.) W 16.0 mm dia. (0.630 in. dia.)

K 16.0 mm (0.63 in.) X 34.5 mm dia. (1.36 in. dia.) (1) Spacer

L 41.0 mm (1.61 in.) Y 38.0 mm dia. (1.50 in. dia.) (2) Block

M Chamfer 1 mm (0.04 in.) Z 25.0 mm (0.984 in.) (3) Cap

KiSC issued 11, 2014 A

Page 60

GENERAL

B2301, B2601, WSM

G-45

9. TIRES

[1] TIRE PRESSURE

WARNING

To avoid personal injury or death:

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

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

IMPORTANT

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

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

check it everyday and inflate as necessary.

 Dual Tires

Dual tires are not approved.

9Y1211156GEG0065US0

Tire sizes Inflation Pressure

Rear

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

, 20 psi)

9.5-18, 4PR 160 kPa (1.6 kgf/cm

, 23 psi)

315/75D-15, 4PR 100 kPa (1.0 kgf/cm

, 14 psi)

11.2-16, 4PR 130 kPa (1.3 kgf/cm

, 18 psi)

12-16.5, 4PR 270 kPa (2.7 kgf/cm

, 40 psi)

31 × 13.5-15, 4PR 140 kPa (1.4 kgf/cm

, 20 psi)

31 × 15.5-15, 4PR 140 kPa (1.4 kgf/cm

, 20 psi)

33 × 12.5-15, 4PR 140 kPa (1.4 kgf/cm

, 20 psi)

Front

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

, 28 psi)

7-12, 4PR 170 kPa (1.7 kgf/cm

, 24 psi)

21 × 8.00-10, 4PR 160 kPa (1.6 kgf/cm

, 23 psi)

22 × 8.50-12, 4PR 160 kPa (1.6 kgf/cm

, 23 psi)

23 × 8.50-12 Turf, 4PR 150 kPa (1.5 kgf/cm

, 22 psi)

23 × 8.50-12 Ind., 4PR 250 kPa (2.5 kgf/cm

, 35 psi)

24 × 8.50-12., 4PR 160 kPa (1.6 kgf/cm

, 23 psi)

KiSC issued 11, 2014 A

Page 61

GENERAL

B2301, B2601, WSM

G-46

[2] WHEEL ADJUSTMENT

WARNING

To avoid personal injury or death:

• 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.

9Y1211156GEG0066US0

(1) Front Wheels

Front Wheels

Front tread width can not be adjusted.

IMPORTANT

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

• 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 10 times of shuttle movement by 5 m (5 yards), and thereafter according to service interval. (See "MAINTENANCE" section.)

WARNING

To avoid personal injury or death:

• Before jacking up the tractor, park it on a firm and level ground and chock the rear wheels.

• Fix the front axle to keep it from swinging.

• Select jacks that withstand the machine weight and set them up as shown below.

9Y1211156GEG0067US0

(1) Jack Point

KiSC issued 11, 2014 A

Page 62

GENERAL

B2301, B2601, WSM

G-47

Front Wheels Treads

[USA Models]

[Except USA Models]

9Y1211156GEG0068US0

Model B2301 B2601 B2301, B2601 B2301, B2601

Tires 6-12 Farm 7-12 Farm

23 × 8.50-12

Turf

23 × 8.50-12

lnd.

21 × 8.00-10 Bar

Tread (a) 800 mm (31.5 in.) 815 mm (32.1 in.) 835 mm (32.9 in.) 905 mm (35.6 in.)

Model B2301 B2601 B2301 B2601

Tires 6-12 Farm 7-12 Farm 22 × 8.50-12 Turf 24 × 8.50-12 Turf

Tread (a) 795 mm (31.3 in.) 815 mm (32.1 in.) 835 mm (32.9 in.) 835 mm (32.9 in.)

KiSC issued 11, 2014 A

Page 63

GENERAL

B2301, B2601, WSM

G-48

(2) Rear Wheels

Rear Wheels

Rear tread width can not be adjusted.

IMPORTANT

• Always attach tires as shown in the drawings.

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

WARNING

To avoid personal injury or death:

• Before jacking up the tractor, park it on a firm and level ground and chock the front wheels.

• Fix the front axle to keep it from swinging.

• Select jacks that withstand the machine weight and set them up as shown below.

[A] Wheels with beveled or tapered holes

Use the tapered side of lug nut.

[B] Wheels without beveled or tapered holes

Use the flat side of lug nut. Make sure to apply the spring

washer.

9Y1211156GEG0069US0

(1) Jack Point (2) Lug Nut

(3) Spring Washer

KiSC issued 11, 2014 A

Page 64

GENERAL

B2301, B2601, WSM

G-49

Rear Wheels Tread

[USA Models]

[Except USA Models]

9Y1211156GEG0070US0

Model B2301 B2601 B2301, B2601

Tires 9.5-16 Farm 11.2-16 Farm

33 × 12.5-15 Turf 31 × 15.5-15 Bar

12-16.5 lnd.

Tread A 900 mm (35.4 in.) 950 mm (37.4 in.) 950 mm (37.4 in.)

Model B2301 B2601 B2301 B2601

Tires 9.5-16 Farm 9.5-18 Farm 31 × 13.5-15 Turf 315/75D-15 Turf

Tread (a) 900 mm (35.4 in.) 920 mm (36.2 in.) 970 mm (38.2 in.) 970 mm (38.2 in.)

KiSC issued 11, 2014 A

Page 65

GENERAL

B2301, B2601, WSM

G-50

[3] BALLAST

WARNING

To avoid personal injury or death:

• Additional ballast will be needed for transporting heavy implements. When the implement is raised, drive slowly over rough ground, regardless of how much ballast is used.

• Do not fill the front wheels with liquid.

9Y1211156GEG0071US0

Front Ballast

Add weights if needed for stability and improving traction.

Heavy pulling and heavy rear mounted implements tend to lift front wheels. Add enough ballast to maintain steering control and prevent tip over.

Remove weight when no longer needed.

 Front End Weights (option)

The front end weights can be attached to the bumper.

NOTE

[For installation of up to 3 weights]

• Besides the weight, mounting bolt kit(s) are required for mounting the weight.

[For installation of up to 5 weights]

• Besides the weight, a front weight bracket and mounting bolt kit(s) are required for mounting the weight.

IMPORTANT

• Do not overload tires.

• Add no more weight than indicated in chart.

9Y1211156GEG0072US0

Maximum weight

25 kg (55 lbs) x 5 pieces [125 kg (276 lbs)]

(1) Front End Weights (2) Front Weight Bracket (Option)

KiSC issued 11, 2014 A

Page 66

GENERAL

B2301, B2601, WSM

G-51

Rear Ballast

Add weight to rear wheels if needed to improve traction or for stability. The amount of rear ballast should be matched to job and the ballast should be removed when it is not needed.

The weight should be added to the tractor in the form of liquid ballast.

 Liquid Ballast in Rear Tires

Water and calcium chloride solution provides safe economical ballast. Used properly, it will not damage tires, tubes or rims. The addition of calcium chloride is recommended to prevent the water from freezing. Use of this method of weighting the wheels has the full approval of the tire companies.

Liquid weight per tire (75 Percent filled)

IMPORTANT

• Do not fill tires with water or solution more than 75 % of full capacity (to the level of valve stem at 12 o'clock position).

9Y1211156GEG0073US0

Tire sizes 9.5-16 11.2-16

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

per 4 L (1

gal) of water]

54 kg

(120 lbs)

70 kg

(150 lbs)

Slush free at −24 °C (−11 °F) Solid at −47 °C (−53 °F) [Approx. 1.5 kg (3.3 lbs) CaCl

per 4 L (1

gal) of water]

57 kg

(130 lbs)

74 kg

(160 lbs)

Slush free at −47 °C (−53 °F) Solid at −52 °C (−62 °F) [Approx. 2.25 kg (4.96 lbs) CaCl

per 4 L

(1 gal) of water]

60 kg

(130 lbs)

78 kg

(170 lbs)

(1) Air (2) Water

(A) Correct: 75 % Full

Air compresses like a cushion

(B) Incorrect: 100 % Full

Water can not be compressed

KiSC issued 11, 2014 A

Page 67

GENERAL

B2301, B2601, WSM

G-52

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.]

9Y1211156GEG0074US0

NOTE

• Implement size may vary depending on soil operating conditions.

9Y1211156GEG0075US0

Tread (max. width) with farm tires

Lower link end max.

loading weight W0

Front Rear

B2301HSD 800 mm (31.5 in.) 900 mm (35.4 in.)

300 kg (660 lbs)

B2601HSD 815 mm (32.1 in.) 950 mm (37.4 in.)

Actual figures

Implement weight W1 and /

or size

Max. drawbar load W2

Trailer loading weight W3

Max. capacity

B2301 B2601

As in the following list

(Shown on the next page)

300 kg (660 lbs) 1000 kg (2210 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)

KiSC issued 11, 2014 A

Page 68

GENERAL

B2301, B2601, WSM

G-53

NOTE

• Implement size may vary depending on soil operating conditions.

9Y1211156GEG0076US0

No. Implement Remarks B2301 B2601

1Mower

Mid-mount

Max. cutting width 152 cm (60 in.)

Max. load capacity 140 kg (300 lbs)

Rotary cutter (1 Blade)

Max. cutting width 122 cm (48 in.)

Max. load capacity 204 kg (450 lbs)

Rear-mount (2 or 3 Blade)

Max. cutting width 152 cm (60 in.)

Max. load capacity 227 kg (500 lbs)

Flail-mower Max. cutting width 122 cm (48 in.)

Sickle bar Max. cutting width 152 cm (60 in.)

2 Rotary tiller

Max. cutting width 127 cm (50 in.)

Max. load capacity 213 kg (470 lbs)

Necessary

3 Bottom plow Max. size 36 cm (14 in.) × 1

4 Disc plow Max. size 56 cm (22 in.) × 1

5 Cultivator Max. size

137 cm (54 in.)

1 Row

6 Disc harrow

Max. harrowing width 152 cm (60 in.)

Max. weight 190 kg (420 lbs)

7 Sprayer Max. tank capacity 190 L (50 U.S.gals)

8 Front blade

Max. cutting width 152 cm (60 in.)

Sub frame Necessary

9 Rear blade

Max. cutting width 152 cm (60 in.)

Max. weight 160 kg (350 lbs)

10 Front loader

Max. lifting capacity (Bucket center)

360 kg (794 lbs)

Max. width 127 cm (50 in.)

Sub frame Necessary

11 Box blade

Max. cutting width 137 cm (54 in.)

Max. weight 227 kg (500 lbs)

12 Back hoe

Max. digging depth 198 cm (78 in.)

Max. weight 320 kg (705 lbs)

Sub frame Necessary

13 Snow blower

Max. digging depth 152 cm (60 in.)

Max. weight 200 kg (450 lbs)

Sub frame Necessary

14 Trailer

Max. load capacity 1000 kg (2200 lbs)

Max. drawbar load 300 kg (660 lbs)

KiSC issued 11, 2014 A

Page 69

1 ENGINE

KiSC issued 11, 2014 A

Page 70

CONTENTS

1. ENGINE BODY ........................................................................................................................... 1-M1

[1] CLOSED BREATHER .......................................................................................................... 1-M1

[2] GOVERNOR......................................................................................................................... 1-M2

MECHANISM

KiSC issued 11, 2014 A

Page 71

ENGINE

B2301, B2601, WSM

1-M1

1. ENGINE BODY

[1] CLOSED BREATHER

Closed breather system has been adopted to

prevent the release of blow-by gas into the atmosphere.

After its oil content is filtered by oil shield (4), the blow by gas in fed back to the intake manifold through breather valve (3) to be used for re-combustion.

9Y1211156ENM0001US0

(1) Breather Tube (2) Cylinder Head Cover (3) Breather Valve

(4) Oil Shield (5) Rubber Packing

KiSC issued 11, 2014 A

Page 72

ENGINE

B2301, B2601, WSM

1-M2

[2] GOVERNOR

Three Lever Type Fork Lever

The governor system is a mechanical governor that

used the flyweight (5).

The flyweight (5) is mounted on the governor shaft

that rotates at the same speed as the crankshaft.

Because the feature of this mechanism takes out the engine speed directly as a centrifugal force of weight, the speed control that the change in the engine rotational speed is sensitively transmitted to fork lever assembly (A) and accuracy is high is enabled.

The fork lever assembly of this engine consists of fork lever 1 (6), for lever 2 (9), and the floating lever (7). A slide plate is installed in fork lever 1. The governor spring (3) is hooked to fork lever 2 (9).

The floating lever (7) installs the torque pin (8) of the output drop prevention at the overload. The start spring (2) is hooked to a slide plate, and holds the control rack in the direction of the full fuel position.

Fork lever 2 (9) and the floating lever are installed in fork lever 1 (6) with the fork lever shaft (4). The max torque limitation (1) device limits the amount of the fuel injection at the overload with the torque pin.

9Y1211156ENM0002US0

(At Rated Operation)

When the engine operates, the fork lever 2 (9) and the floating lever (7) are moving with the fork lever 1 (6) due to the tension of the governor spring (3).

During the time, the torque pin (8) is pressed into the floating lever by centrifugal force of the governor weight (5).

The fork lever 2 (9) comes in contact with the fuel limitation bolt (10), and the fuel injection pump supplies a fuel necessary for rated operation.

9Y1211156ENM0003US0

(1) Max Torque Limiter (2) Start Spring (3) Governor Spring (4) Fork Lever Shaft (5) Flyweight (6) Fork Lever 1

(7) Floating Lever (8) Torque Pin (9) Fork Lever 2

(A) Fork Lever Assembly

(1) Max Torque Limiter (6) Fork Lever 1 (7) Floating Lever

(9) Fork Lever 2 (10) Fuel Limitation Bolt

KiSC issued 11, 2014 A

Page 73

ENGINE

B2301, B2601, WSM

1-M3

(Overloaded Operation)

The amount of the movement of the fork lever assembly is limited with the fuel limitation bolt (10) and can not be moved in the direction of the fuel increase.

As overload reduces the centrifugal force of the governor weight, which is pressing the torque pin (8) into the floating lever (7), the floating lever pushes the fork lever 1 (6) in the way to increase the fuel supply with the help of the torque spring tension.

The fuel supply increases (b) in relation to the degree of the torque pin motion, thus preventing the engine speed from dropping.

At the time, the maximum torque limiter (1) prevents superfluous fuel supply and suppresses the generation of black smoke.

9Y1211156ENM0004US0

(1) Max Torque Limiter (6) Fork Lever 1 (7) Floating Lever (8) Torque Pin (9) Fork Lever 2 (10) Fuel Limitation Bolt

(a) Distance to which torque

pin (8) pushes fork lever 1 (6) out

(b) Increase of fuel

KiSC issued 11, 2014 A

Page 74

CONTENTS

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

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

3. TIGHTENING TORQUES ..........................................................................................................1-S11

[1] TRACTOR SECTION ..........................................................................................................1-S11

[2] ENGINE SECTION ..............................................................................................................1-S11

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

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

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

(2) Lubricating System ........................................................................................................1-S14

(3) Cooling System .............................................................................................................1-S14

(4) Fuel System...................................................................................................................1-S17

[2] PREPARATION...................................................................................................................1-S21

(1) Draining Lubricants and Coolant ...................................................................................1-S21

(2) Separating Engine from Clutch Housing .......................................................................1-S23

(3) Separating Engine from Front Axle Frame ....................................................................1-S24

[3] DISASSEMBLING AND ASSEMBLING ..............................................................................1-S25

(1) External Components ....................................................................................................1-S25

(2) Cylinder Head and Valve and Oil Pan ...........................................................................1-S25

(3) Gear Case .....................................................................................................................1-S28

(4) Piston and Connecting Rod...........................................................................................1-S32

(5) Crankshaft .....................................................................................................................1-S35

[4] SERVICING.........................................................................................................................1-S37

(1) Cylinder Head and Valves .............................................................................................1-S37

(2) Idle Gear and Camshaft ................................................................................................1-S42

(3) Piston and Connecting Rod...........................................................................................1-S44

(4) Crankshaft .....................................................................................................................1-S47

(5) Cylinder .........................................................................................................................1-S51

(6) Oil Pump........................................................................................................................1-S51

SERVICING

KiSC issued 11, 2014 A

Page 75

ENGINE

B2301, B2601, WSM

1-S1

1. TROUBLESHOOTING

Symptom

Probable Cause and Checking Procedure

Solution

Reference

Page

Engine Does Not Start

1. No fuel Check fuel G-8

2. Air in the fuel system Bleed air G-33

3. Water in the fuel system Solution order

1. Repair or replace fuel system

1-S17

2. Change fuel G-8

4. Fuel hose clogged Clean or replace fuel hose G-25

5. Fuel filter clogged Solution order

1. Replace fuel filter

G-24

2. Check or change fuel G-8

6. Excessively high viscosity of fuel or engine oil at low temperature

Check fuel or engine oil G-8

7. Fuel with low cetane number

Check fuel G-8

8. Fuel leak due to loose injection pipe retaining nut

Repair retaining nut 1-S26

9. Incorrect injection timing Solution order

1. Check injection timing

1-S17

2. Adjust injection timing

10.Fuel camshaft worn Solution order

1. Inspect camshaft

1-S31

2. Replace camshaft

11.Injection nozzle clogged Solution order

1. Inspect injection nozzle

1-S17

2. Replace or clean injection nozzle

12.Injection pump malfunctioning

Repair or replace injection pump 1-S30

13.Seizure of crankshaft, camshaft, piston, cylinder or bearing

Solution order

1. Inspect crankshaft, camshaft, piston, cylinder or bearing

1-S43 to

1-S51

2. Replace crankshaft, camshaft, piston, cylinder or bearing

1-S31 to

1-S36

14.Compression leak from cylinder

Solution order

1. Check compression pressure

1-S12

2. Inspect or replace head gasket 1-S27

3. Inspect or replace piston or piston ring 1-S34, 1-S46

4. Inspect or replace cylinder 1-S51

15.Improper valve timing Check or replace timing gear 1-S31

16.Piston ring and cylinder worn

Solution order

1. Inspect piston ring and cylinder

1-S46,

1-S51

2. Replace piston ring or cylinder 1-S34, 1-S51

17.Excessive valve clearance Solution order

1. Check and adjust valve clearance

1-S13

KiSC issued 11, 2014 A

Page 76

ENGINE

B2301, B2601, WSM

1-S2

Engine Does Not Start

18.Stop solenoid malfunctioning

Solution order

1. Check or replace stop solenoid

8-S15

2. Check or repair wire harness 8-M1

Starter Does Not Operate

1. Battery discharged Charge battery 8-S10

2. Starter malfunctioning Solution order

1. Check or replace starter

8-S15

3. Key switch malfunctioning Check or replace key switch 8-S13

Engine Revolution Is Not Smooth

1. Fuel filter clogged or dirty Solution order

1. Replace fuel filter

G-24

2. Check or change fuel G-8

2. Air cleaner clogged Clean or change air cleaner G-23

3. Fuel leak due to loose injection pipe retaining nut

Repair retaining nut 1-S26

4. Injection pump malfunctioning

Replace injection pump 1-S30

5. Incorrect nozzle injection pressure

Solution order

1. Check injection pressure

1-S19

2. Repair or clean injection nozzle 1-S20

6. Injection nozzle stuck or clogged

Solution order

1. Check injection pressure

1-S19

2. Repair or clean injection nozzle 1-S20

7. Governor malfunctioning Solution order

1. Check governor spring or fuel cam shaft

1-S30

2. Replace governor spring or fuel cam shaft

1-S30

Either White or Blue Exhaust Gas Is Observed

1. Excessive engine oil Reduce to specified level G-8

2. Piston ring and cylinder worn or stuck

Solution order

1. Inspect piston ring and cylinder

1-S46,

1-S51

2. Replace piston ring or cylinder 1-S34, 1-S51

3. Incorrect injection timing Solution order

1. Check injection timing

1-S17

2. Adjust injection timing

4. Deficient compression Solution order

1. Check compression pressure

1-S12

2. Inspect or replace head gasket 1-S27

3. Inspect or replace piston or piston ring 1-S34, 1-S46

4. Inspect or replace cylinder 1-S51

Oil Leak into Suction Pipe

1. Waste oil pipe clogged or deformed

Repair or replace pipe 1-S25

2. Piston ring seal is damaged

Replace piston ring 1-S34

Symptom

Probable Cause and Checking Procedure

Solution

Reference

Page

KiSC issued 11, 2014 A

Page 77

ENGINE

B2301, B2601, WSM

1-S3

Either Black or Dark Gray Exhaust Gas Is Observed

1. Low grade fuel used Check fuel G-8

2. Fuel filter clogged Solution order

1. Replace fuel filter

G-24

2. Check or change fuel G-8

3. Air cleaner clogged Clean or change air cleaner G-23

4. Deficient nozzle injection Solution order

1. Inspect injection nozzle

1-S27

2. Replace or clean injection nozzle

Deficient Output 1. Incorrect injection timing Solution order

1. Check injection timing

1-S17

2. Adjust injection timing

2. Injection pump malfunctioning

Replace injection pump 1-S30

3. Uneven fuel injection Replace injection pump 1-S30

4. Deficient nozzle injection Solution order

1. Inspect injection nozzle

1-S17

2. Replace or clean injection nozzle

5. Compression leak Solution order

1. Check compression pressure

1-S12

2. Check or replace head gasket 1-S27

3. Inspect or replace piston or piston ring 1-S34, 1-S46

4. Inspect or replace cylinder 1-S51

6. Gas leak from exhaust system

Repair or replace exhaust system 1-S25

7. Air cleaner dirty or clogged Clean or change air cleaner G-23

Excessive Lubricant Oil Consumption

1. Piston ring's gap facing the same direction

Repair piston ring gap 1-S46

2. Oil ring worn or stuck Solution order

1. Inspect piston ring and cylinder

1-S46,

1-S51

2. Replace piston ring or cylinder 1-S34, 1-S51

3. Piston ring groove worn Replace piston 1-S44

4. Valve stem and valve guide worn

Inspect or replace valve stem and valve guide

1-S38

5. Crankshaft bearing and crank pin bearing worn

Inspect or replace crankshaft and crank pin

1-S47

Fuel Mixed into Lubricant Oil

1. Injection pump's plunger worn

Repair or replace injection pump 1-S30

2. Deficient nozzle injection Repair or replace nozzle 1-S20

3. Injection pump broken Replace injection pump 1-S30

Water Mixed into Lubricant Oil

1. Head gasket damaged Replace head gasket 1-S27

2. Cylinder block or cylinder head flawed

Replace cylinder head 1-S27

Symptom

Probable Cause and Checking Procedure

Solution

Reference

Page

KiSC issued 11, 2014 A

Page 78

ENGINE

B2301, B2601, WSM

1-S4

9Y1211156ENS0001US0

Low Oil Pressure 1. Engine oil insufficient Check engine oil G-8

2. Oil filter cartridge clogged Replace oil filter cartridge G-25

3. Oil pump damaged Replace oil pump 1-S51

4. Excessive oil clearance of crankshaft bearing

Inspect or replace crankshaft bearing 1-S49,

1-S50

5. Excessive oil clearance of crankpin bearing

Inspect or replace crankshaft 1-S47

High Oil Pressure 1. Different type of oil Check engine oil G-8

Engine Overheated 1. Engine oil insufficient Check engine oil G-8

2. Fan belt broken or elongated

Adjust or replace fan belt 1-S25

3. Coolant insufficient Check coolant G-8

4. Radiator net and radiator fin clogged with dust

Clean radiator net and fin G-17

5. Inside of radiator corroded Clean or replace radiator G-17

6. Coolant flow route corroded

Clean coolant flow route G-31

7. Radiator cap damaged Inspect or replace radiator cap 1-S16

8. Radiator hose damaged Check or replace radiator hose G-27

9. Thermostat valve damaged

Inspect or replace thermostat 1-S15

10.Unsuitable fuel used Check fuel G-8

11.Head gasket damaged Replace head gasket 1-S27

12.Incorrect injection timing Solution order

1. Check injection timing

1-S17

2. Adjust injection timing

Battery Quickly Discharged

1. Battery electrolyte insufficient

Check or charge battery 8-S10

2. Fan belt slips Adjust or replace fan belt 1-S25

3. Dynamo damaged Solution order

1. Check dynamo

8-S17

2. Replace dynamo 8-S24

Symptom

Probable Cause and Checking Procedure

Solution

Reference

Page

KiSC issued 11, 2014 A

Page 79

ENGINE

B2301, B2601, WSM

1-S5

2. SERVICING SPECIFICATIONS

ENGINE BODY

Item Factory Specification Allowable Limit

Compression Pressure

• Variance Among Cylinders

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

10 % or less

Valve Clearance (Cold) 0.145 to 0.185 mm

0.0057 to 0.0073 in.

–

Top Clearance 0.55 to 0.75 mm

0.022 to 0.029 in.

–

Cylinder Head Surface Flatness – 0.05 mm

0.002 in.

Valve Recessing Intake and Exhaust 0.050 to 0.25 mm

0.0020 to 0.0098 in.

0.40 mm

0.016 in.

Valve Stem to Valve Guide

• Valve Stem

• Valve Guide

Clearance

O.D.

I.D.

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.

0.10 mm

0.0039 in.

–

Valve Guide (Intake and Exhaust)

7.010 to 7.025 mm

0.2760 to 0.2765 in.

–

Valve Face Angle (Intake)

Angle (Exhaust)

1.0 rad 60 °

0.79 rad 45 °

–

Valve Seat Angle (Intake)

Angle (Exhaust)

Width

1.0 rad 60 °

0.79 rad 45 °

2.12 mm

0.0835 in.

–

Valve Spring Free Length

Tilt

Setting Load

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.

36.5 mm

1.44 in.

1.0 mm

0.039 in.

100.0 N / 31.0 mm

10.20 kgf / 31.0 mm

22.48 lbf / 1.22 in.

KiSC issued 11, 2014 A

Page 80

ENGINE

B2301, B2601, WSM

1-S6

Rocker Arm Shaft to Rocker Arm

• Rocker Arm Shaft

• Rocker Arm

Clearance

O.D.

I.D.

0.016 to 0.045 mm

0.00063 to 0.0017 in.

11.973 to 11.984 mm

0.47138 to 0.47181 in.

12.000 to 12.018 mm

0.47244 to 0.47314 in.

0.10 mm

0.0039 in.

–

Push Rod Alignment – 0.25 mm

0.0098 in.

Tappet to Tappet Guide Bore

• Tappet

• Tappet Guide

Clearance

O.D.

I.D.

0.020 to 0.062 mm

0.00079 to 0.0024 in.

19.959 to 19.980 mm

0.78579 to 0.78661 in.

20.000 to 20.021 mm

0.78740 to 0.78822 in.

0.07 mm

0.003 in.

–

Idle Gear

• Crank Gear to Idle Gear 1

• Idle Gear 1 to Cam Gear

• Idle Gear 1 to Injection Pump Gear

• Idle Gear 1 to Idle Gear 2

Backlash

0.0320 to 0.115 mm

0.00126 to 0.00452 in.

0.0360 to 0.114 mm

0.00142 to 0.00448 in.

0.0340 to 0.116 mm

0.00134 to 0.00456 in.

0.0330 to 0.117 mm

0.00130 to 0.00460 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.

Idle Gear

• Idle Gear 1

• Idle Gear 2

Side Clearance

0.20 to 0.51 mm

0.0079 to 0.020 in.

0.20 to 0.51 mm

0.0079 to 0.020 in.

0.80 mm

0.031 in.

0.80 mm

0.031 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

Exhaust

28.80 mm

1.134 in.

29.00 mm

1.142 in.

28.75 mm

1.132 in.

28.95 mm

1.140 in.

Camshaft Journal to Cylinder Block Bore

• Camshaft Journal

• Cylinder Block Bore

Oil Clearance

O.D.

I.D.

0.050 to 0.091 mm

0.0020 to 0.0035 in.

35.934 to 35.950 mm

1.4147 to 1.4153 in.

36.000 to 36.025 mm

1.4173 to 1.4183 in.

0.15 mm

0.0059 in.

–

Item Factory Specification Allowable Limit

KiSC issued 11, 2014 A

Page 81

ENGINE

B2301, B2601, WSM

1-S7

Piston Pin Bore I.D. 22.000 to 22.013 mm

0.86615 to 0.86665 in.

22.03 mm

0.8673 in.

Piston Pin to Small End Bushing

•Piston Pin

• Small End Bushing

Clearance

O.D.

I.D.

0.014 to 0.038 mm

0.00055 to 0.0014 in.

22.002 to 22.011 mm

0.86622 to 0.86657 in.

22.025 to 22.040 mm

0.86713 to 0.86771 in.

0.15 mm

0.0059 in.

–

Piston Pin to Small End Bushing (Spare Parts)

• Small End Bushing

Clearance

I.D.

0.014 to 0.038 mm

0.00056 to 0.0014 in.

22.025 to 22.040 mm

0.86713 to 0.86771 in.

0.15 mm

0.0059 in.

–

Piston Ring Gap [D1005]

• Top Ring

• Second Ring

• Oil Ring

0.30 to 0.45 mm

0.012 to 0.017 in.

0.30 to 0.45 mm

0.012 to 0.017 in.

0.25 to 0.45 mm

0.0099 to 0.017 in.

1.25 mm

0.0492 in.

1.25 mm

0.0492 in.

1.25 mm

0.0492 in.

Piston Ring Gap [D1105]

• Top Ring

• Second Ring

• Oil Ring

0.15 to 0.25 mm

0.0059 to 0.0098 in.

0.40 to 0.55 mm

0.016 to 0.021 in.

0.25 to 0.45 mm

0.0091 to 0.017 in.

1.20 mm

0.0472 in.

1.20 mm

0.0472 in.

1.25 mm

0.0492 in.

Piston Ring to Piston Ring Groove

• Second Ring

• Oil Ring

Clearance

0.0950 to 0.122 mm

0.00374 to 0.00480 in.

0.020 to 0.060 mm

0.00079 to 0.0023 in.

0.2 mm

0.008 in.

0.15 mm

0.0059 in.

Connecting Rod Alignment – 0.05 mm

0.002 in.

Crankshaft Side Clearance

Alignment

0.15 to 0.31 mm

0.0059 to 0.012 in.

–

0.50 mm

0.020 in.

0.02 mm

0.0008 in.

Crankpin to Crankpin Bearing

• Crankpin

• Crankpin Bearing

Oil Clearance

O.D.

I.D.

0.029 to 0.091 mm

0.0011 to 0.0036 in.

39.959 to 39.975 mm

1.5732 to 1.5738 in.

40.040 to 40.050 mm

1.5750 to 1.5767 in.

0.20 mm

0.0079 in.

–

Item Factory Specification Allowable Limit

KiSC issued 11, 2014 A

Page 82

ENGINE

B2301, B2601, WSM

1-S8

Crankshaft to Crankshaft Bearing 1

• Crankshaft

• Crankshaft Bearing 1

Oil Clearance

O.D.

I.D.

0.0340 to 0.114 mm

0.00134 to 0.00448 in.

47.934 to 47.950 mm

1.8872 to 1.8877 in.

47.984 to 48.048 mm

1.8892 to 1.8916 in.

0.20 mm

0.0079 in.

–

Crankshaft to Crankshaft Bearing 2

• Crankshaft Journal

• Crankshaft Bearing 2

Oil Clearance

O.D.

I.D.

0.034 to 0.095 mm

0.0014 to 0.0037 in.

47.934 to 47.950 mm

1.8872 to 1.8877 in.

47.984 to 48.029 mm

1.8892 to 1.8909 in.

0.20 mm

0.0079 in.

–

Crankshaft to Crankshaft Bearing 3

• Crankshaft Journal

• Crankshaft Bearing 3

Oil Clearance

O.D.

I.D.

0.034 to 0.103 mm

0.00134 to 0.00405 in.

51.921 to 51.940 mm

2.0442 to 2.0448 in.

51.974 to 52.024 mm

2.0463 to 2.0481 in.

0.20 mm

0.0079 in.

–

Cylinder [D1005]

[D1105]

I.D.

76.000 to 76.019 mm

2.9922 to 2.9929 in.

78.000 to 78.019 mm

3.0709 to 3.0716 in.

76.15 mm

2.998 in.

78.15 mm

3.077 in.

Cylinder Liner (Oversized) [D1005]

[D1105]

I.D.

76.500 to 76.519 mm

3.0119 to 3.0125 in.

78.500 to 78.519 mm

3.0906 to 3.0912 in.

76.65 mm

3.018 in.

78.65 mm

3.096 in.

Item Factory Specification Allowable Limit

KiSC issued 11, 2014 A

Page 83

ENGINE

B2301, B2601, WSM

1-S9

LUBRICATING SYSTEM

COOLING SYSTEM

Item Factory Specification Allowable Limit

Engine Oil Pressure At Idle Speed

At Rated Speed

–

196 to 441 kPa

2.0 to 4.5 kgf/cm

28.5 to 64 psi

49 kPa

0.5 kgf/cm

7 psi

147 kPa

1.5 kgf/cm

21.3 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.

–

Inner Rotor to Cover Clearance 0.025 to 0.075 mm

0.00099 to 0.0029 in.

–

Item Factory Specification Allowable Limit

Fan Belt Tension 7.0 to 9.0 mm

0.28 to 0.35 in.

–

Thermostat Valve Opening

Temperature (At Beginning)

Valve Opening Temperature (Opened Completely)

69.5 to 72.5 °C

157.1 to 162.5 °F

85 °C

185 °F

–

Radiator Cap Pressure Falling

Time

More than 10 seconds

for pressure fall from

88 to 59 kPa

(from 0.89 to 0.61

kgf/cm

, from

12 to 8.6 psi)

–

Radiator Water Leakage

Test Pressure

137 kPa

1.4 kgf/cm

20 psi

–

KiSC issued 11, 2014 A

Page 84

ENGINE

B2301, B2601, WSM

1-S10

FUEL SYSTEM

9Y1211156ENS0002US0

Item Factory Specification Allowable Limit

Injection Pump Injection Timing

[D1005]

0.2837 to 0.3097 rad (16.25 to 17.75 °)

after T.D.C.

–

Injection Timing [D1105]

0.2662 to 0.3272 rad (17.25 to 18.75 °)

before T.D.C.

–

Pump Element Fuel Tightness – 13.73 MPa

140 kgf/cm

1991 psi

Delivery Valve Fuel Tightness 10 seconds

13.73 → 12.75 MPa 140 → 130 kgf/cm

1991 → 1849 psi

5 seconds

13.73 → 12.75 MPa 140 → 130 kgf/cm

1991 → 1849 psi

Injection Nozzle Injection Pressure 13.73 to 14.71 MPa

140 to 150 kgf/cm

1990 to 2130 psi

–

Injection Nozzle Valve Seat Valve Seat

Tightness

No fuel leak at

12.75 MPa

130 kgf/cm

1849 psi

–

KiSC issued 11, 2014 A

Page 85

ENGINE

B2301, B2601, WSM

1-S11

3. TIGHTENING TORQUES

Tightening torque of screws, bolts and nuts on the table below are specially specified. (For general use screws,

bolts and nuts: Refer to "5. TIGHTENING TORQUES" on page G-11.)

NOTE

• 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, bolts and nuts on the table, apply engine oil to their threads and seats before tightening.

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

9Y1211156ENS0003US0

[1] TRACTOR SECTION

9Y1211156ENS0004US0

[2] ENGINE SECTION

9Y1211156ENS0005US0

Item N·m kgf·m lbf·ft

Power steering hose 2 24 to 28 2.5 to 2.8 18 to 20

Engine mounting screw 59 to 69 6.1 to 7.0 44 to 50

Item Size × Pitch N·m kgf·m lbf·ft

Oil pressure switch – 15 to 19 1.5 to 2.0 11 to 14

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

Overflow pipe nut – 35 to 39 3.5 to 4.0 26 to 28

Nozzle holder assembly – 49 to 68 5.0 to 7.0 36 to 50

*Cylinder head cover nuts M7 × 1.0 7 to 8 0.7 to 0.9 5 to 6

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

*Rocker arm bracket nuts 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 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 M10 × 1.25 53.9 to 58.8 5.5 to 6.0 39.8 to 43.4

*Bearing case cover screws M6 × 1.0 10.8 to 12.2 1.10 to 1.25 7.96 to 9.04

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

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

KiSC issued 11, 2014 A

Page 86

ENGINE

B2301, B2601, WSM

1-S12

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

(1) Engine Body

Compression Pressure

1. Operate the engine until it is warmed up.

2. Stop the engine.

3. Remove the air cleaner, the muffler and all glow plugs (or nozzles).

4. Set a compression tester with the adaptor to the glow plug hole (or nozzle hole). Nozzle Hole: Adaptor H Glow Plug Hole: Adaptor L

5. After making sure that the stop lever is set at the stop position (non-injection), operate the engine with the starter and measure the compression pressure.

6. Repeat steps 4 and 5 for each cylinder.

7. If the measurement is below the allowable limit, apply a small amount of oil to the cylinder wall through the glow plug hole (or nozzle hole) and measure the compression pressure again.

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

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

NOTE

• Check the compression pressure with the specified valve clearance.

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

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

9Y1211156ENS0006US0

Compression pressure

Factory specification

3.73 to 4.11 MPa

38.0 to 42.0 kgf/cm

541 to 597 psi

Allowable limit

2.26 MPa

23.0 kgf/cm

327 psi

KiSC issued 11, 2014 A

Page 87

ENGINE

B2301, B2601, WSM

1-S13

Valve Clearance 1

IMPORTANT

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

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

2. Align the "1TC" mark line 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, adjust with the adjusting screw.

NOTE

• 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 front case. Turn the flywheel 0.26 rad (15 °) clockwise and counterclockwise to see if the piston is at the compression top dead center or the overlap position. Now referring to the table below, readjust the valve clearance. (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.)

• Finally turn the flywheel 6.28 rad (360 °) and align the "TC" marking line and the center of timing window. Adjust all the other valve clearance as required.

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

: Valve clearance is adjustable.

9Y1211156ENS0007US0

Valve clearance Factory specification

0.145 to 0.185 mm

0.0057 to 0.0073 in.

Adjustable cylinder location

of piston

Number of cylinders

Valve arrangement

3-cylinder 4-cylinder

IN. EX. IN. EX.

When No. 1 piston comes to compression top dead center

No. 1 

No. 2 

No. 3 

No. 4

When No. 1 piston comes to overlap position

No. 1

No. 2 

No. 3 

No. 4 

(1) Timing Window (2) TC Mark Line

A: Valve Clearance

KiSC issued 11, 2014 A

Page 88

ENGINE

B2301, B2601, WSM

1-S14

(2) Lubricating System

Engine Oil Pressure

1. Remove the engine oil pressure switch, and set an oil pressure tester.

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

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

• Engine oil insufficient

• Oil pump damaged

• Oil strainer clogged

• Oil filter cartridge clogged

• Oil gallery clogged

• Excessive oil clearance

• Foreign matter in the relief valve

(When reassembling)

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

9Y1211156ENS0008US0

(3) Cooling System

Fan Belt Tension

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

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

9Y1211156ENS0009US0

Engine oil pressure

At idle speed

Allowable limit

49 kPa

0.5 kgf/cm

7 psi

At rated speed

Factory specification

196 to 441 kPa

2.0 to 4.5 kgf/cm

28.5 to 64 psi

Allowable limit

147 kPa

1.5 kgf/cm

21.3 psi

Tightening torque Oil pressure switch

15 to 19 N·m

1.5 to 2.0 kgf·m 11 to 14 lbf·ft

Deflection (A) Factory specification

7.0 to 9.0 mm

0.28 to 0.35 in.

KiSC issued 11, 2014 A

Page 89

ENGINE

B2301, B2601, WSM

1-S15

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.

9Y1211156ENS0010US0

Thermostat Valve Opening Temperature

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

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

3. Continue heating and read the temperature when the valve opens approx. 8 mm (0.3 in.).

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

9Y1211156ENS0011US0

(A) Good (B) Bad

Thermostat's valve opening temperature

Factory specification

69.5 to 72.5 °C

157.1 to 162.5 °F

Temperature at which thermostat completely open

Factory specification

85 °C 185 °F

KiSC issued 11, 2014 A

Page 90

ENGINE

B2301, B2601, WSM

1-S16

CAUTION

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

9Y1211156ENS0012US0

Radiator Cap Air Leakage

1. Set a radiator tester (1) and adaptor (2) on the radiator cap.

2. Apply the specified pressure 88 kPa (0.89 kgf/cm

, 12 psi), and

measure the time for the pressure to fall to 59 kPa (0.61 kgf/cm

8.6 psi).

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

9Y1211156ENS0013US0

Radiator Water Leakage

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

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

3. Check the radiator for water leaks.

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

9Y1211156ENS0014US0

Pressure falling time Factory specification

More than 10 seconds for pressure fall from 88 to 59 kPa (from 0.89 to 0.61 kgf/cm

from 12 to 8.6 psi)

(1) Radiator Tester (2) Adaptor

Radiator water leakage test pressure

Factory specification

137 kPa

1.4 kgf/cm

20 psi

(1) Radiator Tester (2) Adaptor

KiSC issued 11, 2014 A

Page 91

ENGINE

B2301, B2601, WSM

1-S17

(4) Fuel System

Injection Timing

1. Remove the injection pipes.

2. Remove the engine stop solenoid.

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 shims.

NOTE

• 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 0.20 mm (0.0079 in.),

0.25 mm (0.0098 in.), 0.30 mm (0.012 in.), 0.35 mm (0.014 in.) and 0.175 mm (0.00689 in.). Combine these shims for adjustments.

• Addition or reduction of shim (0.025 mm, 0.00098 in.) delays or advances the injection timing by approx.

0.0044 rad (0.25 °).

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

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

9Y1211156ENS0015US0

Injection timing [D1005] Factory specification

0.2837 to 0.3097 rad (16.25 to 17.75 °) after T.D.C.

Injection timing [D1105] Factory specification

0.2662 to 0.3272 rad (17.25 to 18.75 °) before T.D.C.

(1) Timing Line (2) Alignment Mark (3) Shim (Soft Metal Gasket Shim) (4) Two-holes: 0.20 mm (0.0079 in.)

Two-holes: 0.175 mm (0.00689 in.) (5) One-hole: 0.25 mm (0.0098 in.) (6) Without hole: 0.30 mm (0.012 in.) (7) Three-holes: 0.35 mm (0.014 in.)

(A) Engine mounted on the tractor (B) Engine only

KiSC issued 11, 2014 A

Page 92

ENGINE

B2301, B2601, WSM

1-S18

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. Operate 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.

NOTE

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

9Y1211156ENS0016US0

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. Operate 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 kgf/cm

, 1991 psi).

7. Now turn the flywheel back about half a turn (to keep the plunger free). Keep the flywheel at this position and clock the time taken for the pressure to drop from 13.73 to 12.75 MPa (from 140 to 130 kgf/cm

, from 1991 to 1849 psi).

8. Measure the time needed to decrease the pressure from 13.73 to 12.75 MPa (from 140 to 130 kgf/cm

, 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.

NOTE

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

9Y1211156ENS0017US0

Fuel tightness of pump element

Allowable limit

13.73 MPa 140 kgf/cm

1991 psi

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

(3) Protection Cover for Jetted Fuel

Fuel tightness of delivery valve

Factory specification

10 seconds

13.73 → 12.75 MPa 140 → 130 kgf/cm

1991 → 1849 psi

Allowable limit

5 seconds

13.73 → 12.75 MPa 140 → 130 kgf/cm

1991 → 1849 psi

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

(3) Protection Cover for Jetted Fuel

KiSC issued 11, 2014 A

Page 93

ENGINE

B2301, B2601, WSM

1-S19

Nozzle Spraying Condition

CAUTION

• Check the injection pressure and condition after you make sure 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.

• Use eyes protector on eyes before inspecting the high pressure fuel from the fuel injection nozzle temporarily.

• Set the protection board for jetted fuel near the tractor before inspecting the high pressure fuel from the injection nozzle temporarily.

• Use face protector on face before inspecting the high pressure fuel from the fuel injection nozzle temporarily.

• Use leather gloves or protector on hands, arm covers on arms and protector on body before inspecting the high pressure fuel from the fuel injection nozzle temporarily.

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

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

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Fuel Injection Pressure

1. Set the injection nozzle to a nozzle tester.

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

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

(Reference)

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

, 34 psi)

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(a) Good (b) Bad

Fuel injection pressure Factory specification

13.73 to 14.71 MPa 140 to 150 kgf/cm

1990 to 2130 psi

(1) Adjusting Washer

KiSC issued 11, 2014 A

Page 94

ENGINE

B2301, B2601, WSM

1-S20

Valve Seat Tightness

1. Set the injection nozzle to a nozzle tester.

2. Raise the fuel pressure, and keep at 12.75 MPa (130 kgf/cm

1849 psi) for 10 seconds.

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

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Nozzle Holder

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

2. Remove the nozzle holder (1), and remove 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.

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Valve seat tightness Factory specification

No fuel leak at

12.75 MPa 130 kgf/cm

1849 psi

Tightening torque

Nozzle holder

35 to 39 N·m

3.5 to 4.0 kgf·m 26 to 28 lbf·ft

Overflow pipe nut

35 to 39 N·m

3.5 to 4.0 kgf·m 26 to 28 lbf·ft

Nozzle holder assembly

49 to 68 N·m

5.0 to 7.0 kgf·m 36 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

KiSC issued 11, 2014 A

Page 95

ENGINE

B2301, B2601, WSM

1-S21

[2] PREPARATION

(1) Draining Lubricants and Coolant

Draining Engine Oil

CAUTION

• Before changing oil, be sure to stop the engine.

1. Start and warm up the engine for approx. 5 minutes.

2. Place an oil pan underneath the engine.

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

4. Screw in the drain plug (1).

5. Fill new oil up to upper line on the dipstick (2).

IMPORTANT

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

• Never mix two different types of oil.

• Use the proper SAE Engine Oil according to ambient temperatures. Refer to "4. LUBRICANTS, FUEL AND COOLANT" on page G-8.

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Engine oil capacity

3.1 L

3.3 U.S.qts

2.8 Imp.qts

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

(A) Oil level is acceptable within this

range.

KiSC issued 11, 2014 A

Page 96

ENGINE

B2301, B2601, WSM

1-S22

Draining Transmission Fluid

CAUTION

• Stop the engine before checking and changing the transmission fluid.

1. Place the oil pan under the tractor.

2. Remove the drain plugs (1), (3), (5) at the mid-PTO shaft and at the bottom of the rear axle cases (4), (6).

3. Drain the transmission fluid.

4. After draining the transmission fluid, reinstall the drain plugs (1), (3), (5).

IMPORTANT

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

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

• Do not mix different brands oil together.

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Draining Coolant

CAUTION

• Never remove the radiator cap until coolant temperature is well below its boiling point. Then loosen cap slightly to the stop to relieve any excess pressure before removing cap completely.

1. Stop the engine and let cool down.

2. Disconnect the radiator hose (1) at the engine side.

3. Remove the radiator cap to completely drain the coolant.

4. After all coolant is drained, connect the radiator hose (1).

(When reassembling)

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Transmission fluid capacity

15 L

4.0 U.S.gals

3.3 Imp.gals

(1) Drain Plug (2) Mid-PTO Shaft (3) Drain Plug

(4) Rear Axle Case (L.H.) (5) Drain Plug (6) Rear Axle Case (R.H.)

Coolant Capacity

3.8 L

4.0 U.S.qts

3.3 Imp.qts

(1) Radiator Hose

KiSC issued 11, 2014 A

Page 97

ENGINE

B2301, B2601, WSM

1-S23

(2) Separating Engine from Clutch Housing

Bonnet, Side Cover and Battery Cord

1. Open the bonnet (1).

2. Disconnect the battery negative cord.

3. Disconnect the head light connectors and remove the bonnet (1) side covers (2).

NOTE

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

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Hydraulic Hoses from Power Steering Cylinder

1. Disconnect the hydraulic hoses (1), (3) from the power steering cylinder (2).

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Fuel

1. Disconnect the fuel hose (1) from the fuel filter (2).

2. Drain the fuel to the fuel tank completely.

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Wiring Harness, Hour Meter Cable and Clamp (Left Side)

1. Disconnect the wiring harness (1) from battery, dynamo, engine and starter.

2. Remove the clamp (2).

3. Loosen the dynamo mounting bolts and remove the hour meter cable (3).

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(1) Bonnet (2) Side Cover

(3) Battery

(1) Hydraulic Hose (R.H.) (2) Power Steering Cylinder

(3) Hydraulic Hose (L.H.)

(1) Fuel Hose (from Fuel Tank) (2) Fuel Filter

(1) Wiring Harness (2) Clamp

(3) Hour Meter Cable

KiSC issued 11, 2014 A

Page 98

ENGINE

B2301, B2601, WSM

1-S24

Accelerator Rod, Power Steering Hose, Fuel Hoses, Connectors and Others (Right Side)

1. Remove the spring plates (1), oil cooler mounting bolts (2) and oil cooler (3).

2. Remove the clamp (4) and the accelerator rod (5).

3. Disconnect the power steering hose (7), hydraulic delivery pipe (6) and hydraulic inlet hose (9).

4. Disconnect the fuel hoses (8).

5. Disconnect the connectors (11) and glow plug harness (10).

6. Remove the shuttle plate (12).

7. Disconnect the clamp (13).

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Separating Clutch Housing

1. Support the transmission with a disassembling stand.

2. Hook the engine with a hoist.

3. Remove the docking bolts and nuts between the engine and the front case.

(When reassembling)

• Align the spline between the front wheel drive shaft and the coupling securely.

• Tighten the docking bolts between the engine and the front case securely.

• Apply liquid gasket (Three Bond 1206D or equivalent) to the joint face of the engine and the front case.

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(3) Separating Engine from Front Axle Frame

Separating Engine from Front Axle Frame

NOTE

• When you replace the engine with new one, please record the serial number of new engine and the parts number which is incorporate with its new engine.

1. Remove the engine and front axle frame mounting screw and separate the engine from the front axle frame.

9Y1211156ENS0031US0

Tightening torque Power steering hose 2

24 to 28 N·m

2.5 to 2.8 kgf·m 18 to 20 lbf·ft

(1) Spring Plate (2) Bolt (3) Oil Cooler (4) Clamp (5) Accelerator Rod (6) Hydraulic Delivery Pipe (7) Power Steering Hose

(8) Fuel Hose (9) Hydraulic Inlet Hose (10) Glow Plug Harness (11) Connector (12) Shuttle Plate (13) Clamp

Tightening torque Engine mounting screw

59 to 69 N·m

6.1 to 7.0 kgf·m 44 to 50 lbf·ft

KiSC issued 11, 2014 A

Page 99

ENGINE

B2301, B2601, WSM

1-S25

[3] DISASSEMBLING AND ASSEMBLING

(1) External Components

Fan, Water Hose, Fan Belt, Dynamo, Muffler, Air Cleaner, Air Cleaner Bracket, Inlet Hose and etc.

1. Remove the external components as shown in the picture.

(When reassembling)

• Check to see that there are no crack on the fan belt surface.

IMPORTANT

• When installing the fan belt (5), be sure to adjust the fan belt tension.

NOTE

• When remove the compressor, condenser and receiver, be careful not to damage the hose bind.

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(2) Cylinder Head and Valve and Oil Pan

Cylinder Head Cover

1. Disconnect the breather hose (1).

2. Remove the head cover nut (2).

3. Remove the cylinder head cover (3).

(When reassembling)

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

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Fan belt deflection (A) Factory specification

7.0 to 9.0 mm

0.28 to 0.35 in.

(1) Inlet Hose (2) Air Cleaner (3) Inlet Hose (4) Fan (5) Fan Belt (6) Water Hose

(7) Muffler (8) Dynamo (9) Air Cleaner Bracket (10) Steel Plate

(A) Deflection

Tightening torque Cylinder head cover nut

7 to 8 N·m

0.7 to 0.9 kgf·m 5 to 6 lbf·ft

(1) Breather Hose (2) Head Cover Nut

(3) Cylinder Head Cover

KiSC issued 11, 2014 A

Page 100

ENGINE

B2301, B2601, WSM

1-S26

Injection Pipes

1. Loosen the screws on the pipe clamp (1).

2. Remove the injection pipes (2).

(When reassembling)

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

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Nozzle Heat Seal Service Removal Procedure

IMPORTANT

• Use a plus (phillips head) screw driver that has a Dia. which is bigger than the heat seal hole (Approx. 6 mm (1/4 in.)).

1. Drive screw driver lightly into the heat seal hole.

2. Turn screw driver three or four times each way.

3. While turning the screw driver, slowly pull the heat seal out together with the injection nozzle gasket.

If the heat seal drops, repeat the above procedure. Heat seal

and injection nozzle gasket must be changed when the injection nozzle is removed for cleaning or for service.

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Rocker Arm and Push Rod

1. Remove the rocker arm bracket nut.

2. Remove the rocker arm assembly (1).

3. Remove the push rods (2).

(When reassembling)

• When putting the push rods (2) onto the tappets (3), check to see if their ends are properly engaged with the dimples.

IMPORTANT

• After installing the rocker arm, be sure to adjust the valve clearance.

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Tightening torque Injection pipe retaining nut

25 to 34 N·m

2.5 to 3.5 kgf·m 18 to 25 lbf·ft

(1) Pipe Clamp (2) Injection Pipe

(1) Plus Screw Driver (2) Injection Nozzle

(3) Injection Nozzle Packin (4) Heat Seal

Tightening torque Rocker arm bracket nut

22 to 26 N·m

2.2 to 2.7 kgf·m 16 to 19 lbf·ft

(1) Rocker Arm Assembly (2) Push Rod

(3) Tappet

KiSC issued 11, 2014 A