Kubota G23, G26, G23 LD, G23 HD, G26 LD Workshop Manual

WORKSHOP MANUAL

KiSC issued 08, 2009 A

G23,G26

TO THE READER

KiSC issued 08, 2009 A

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

maintenance of the G23 and G26. It contains 4 parts: "Information", "General", "Mechanism" and
"Servicing".

Q Information

This section contains information below.

• Safety First

• Safety Label

• Specification

• Dimension

Q General

This section contains information below.

• Engine Identification

• Model Identification

• General Precautions

• Maintenance Check List

• Check and Maintenance

• Special Tools

Q Mechanism

This section contains information on the structure and the function of the unit. Before you continue

with the subsequent sections, make sure that you read this section.

Refer to the latest version of Workshop Manual (Code No. 9Y021-01870) for the diesel engine

mechanism that this workshop manual does not include.

Q Servicing

This section contains information below.

• Troubleshooting

• Servicing Specifications

• Tightening Torques

• Checking, Disassembling and Servicing

All illustrations, photographs and specifications contained in this manual are of the newest

information available at the time of publication.

KUBOTA reserves the right to change all information at any time without notice.
Since this manual includes many models, information or illustrations and photographs can show

more than one model.

May, 2009

© KUBOTA Corporation 2009

I INFORMATION

KiSC issued 08, 2009 A

INFORMATION

KiSC issued 08, 2009 A

CONTENTS

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

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

3. SPECIFICATIONS.......................................................................................................................... I-9

4. DIMENSIONS ............................................................................................................................... I-11

G23, G26, WSM

SAFETY FIRST

DANGER

WARNING

CAUTION

IMPORTANT

NOTE

KiSC issued 08, 2009 A

INFORMATION

1. SAFETY FIRST

• This symbol, the industry's "Safe ty Alert Symbol", is us ed throughout this manual and o n labels on the
machine itself to warn of the possibility of personal injury. Read these instructions carefully.

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

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

• Indicates a potentially hazardous situ ation which, if not av oided, could result in de ath or serious injury.

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

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

• Gives helpful information.

WSM000001INI0001US1

BEFORE YOU START SERVICE

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

• Clean the work area and machine.

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

• Lower the implement to the ground.

• Stop the engine, then remove the key.

• Disconnect the battery negative cable.

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

station.

WSM000001INI0010US1

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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I-1

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

INFORMATION

OPERATE SAFELY

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

• Put on applicable clothing and safety equipment.

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

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

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

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

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

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

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

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

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

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PREVENT A FIRE

• Fuel is very flammable and explosive under some
conditions. Do not smoke or let flames or sparks in
your work area.

• To prevent sparks from an accidental short circuit,
always disconnect the battery negative cable first
and connect it last.

• The battery gas can cause an explosion. Keep the
sparks and open flame away from the top of battery,
especially when you charge the battery.

• Make sure that you do not spill fuel on the engine.

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I-2

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G23, G26, WSM

KiSC issued 08, 2009 A

INFORMATION

KEEP A GOOD AIRFLOW IN THE WORK AREA

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

WSM000001INI0006US1

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.

WSM000001INI0007US1

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.

WSM000001INI0008US1

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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I-3

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

INFORMATION

2. SAFETY DECALS

The following safety decals (pictorial safety labels) are installed on the machine. If a decal becomes

damaged, illegible or is not on the machine, replace it. The decal part number is listed in the parts list.

WSM000001INI0014US0

I-4

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(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

INFORMATION

I-5

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(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

INFORMATION

I-6

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(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

INFORMATION

I-7

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KiSC issued 08, 2009 A

INFORMATION

CARE OF PICTORIAL SAFETY LABELS

1. Keep pictorial safety labels clean and free from obstructing material.

2. Clean pictorial safety labels with soap and water, dry with a soft cloth.

3. Replace damaged or missing pictorial safety labels with new labels.

4. If a component with pictorial safety label(s) affixed is replace with new part, make sure new label(s) is (are)
attached in the same locations(s) as the replace component.

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

I-8

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(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

3. SPECIFICATIONS

INFORMATION

Model

Maximum gross power 17.1 kW (23.3 HP) 18.8 kW (25.5 HP)

Model D902-E3-GT D1005-E3-GT

Type Indirect injection, vertical, water cooled, 4-cycle diesel engine

Number of cylinders 3

Bore and stroke 72 × 73.6 mm (2.83 × 2.90 in.) 76 × 73.6 mm (2.99 × 2.90 in.)

Total displacement 898 cm

Rated revolution 3200 min

Combustion chamber Spherical type (E-TVCS)

Fuel injection pump Bosch MD type mini pump

Governor Centrifugal ball mechanical governor

Injection nozzle Bosch throttle type

Injection timing 0.28 to 0.31 rad (16 ° to 18 °) before T.D.C.

Engine

Capacities

Tyres

Traveling
speeds

Dimensions

Weight (Without mower deck and grass
collector)

PTO Shaft drive

PTO clutch Belt tension Wet disks

Revolution (PTO speed) 2600 min

PTO brake Shoe Wet disks

Steering Hydrostatic type power steering

Transmission Hydrostatic transmission

Brake Wet disks

Injection order 1-2-3

Injection pressure 13.73 MPa (140 kgf/cm

Compression ratio 24 : 1

Lubricating system Forced lubrication by gear pump

Cooling system Pressurized radiator, forced circulation with water pump

Lubricating oil

Starting system Electric starter (12 V, 1.0 kW)

Battery 51R (12V, 450CCA)

Fuel

Fuel tank 20.5 L (5.4 U.S.gals, 4.5 Imp.gals)

Engine crankcase 3.1 L (3.3 U.S.qts, 2.7 Imp.qts) 3.5 L (3.7 U.S.qts, 3.1 Imp.qts)

Engine coolant
(with recovery tank)

Transmission case 11.0 L (11.6 U.S.qts, 9.7 Imp.qts)

Mower gear case oil 1.9 L (2.0 U.S.qts, 1.7 Imp.qts) 2.1 L (2.2 U.S.qts, 1.8 Imp.qts)

Front 16 × 7.50-8 (4PR) Turf

Rear 24 × 12.00-12 (4PR) Turf

Forward 0 to 15.5 km/h (0 to 9.6 mph) 0 to 17.0 km/h (0 to 10.6 mph)

Reverse 0 to 10.0 km/h (0 to 6.2 mph)

Overall length
(with grass collector), without
front weight bracket for HD

Overall width (with mower) 1226 mm (48.3 in.) 1418 mm (55.9 in.)

Overall height 1350 mm (53.1 in.) 1600 mm (63.0 in.) 1350 mm (53.1 in.) 1600 mm (63.0 in.)

Wheel base 1390 mm (54.7 in.) 1460 mm (57.5 in.)

Tread

Front 900 mm (35.4 in.)

Rear 840 mm (33.1 in.)

2980 mm (117.3 in.) 3160 mm (124.4 in.) 3035 mm (119.5 in.) 3215 mm (126.6 in.)

LD HD LD HD

3.1 L (3.3 U.S.qts, 2.7 Imp.qts) 3.3 L (3.5 U.S.qts, 2.9 Imp.qts)

535 kg (1180 lbs) 500 kg (1103 lbs) 565 kg (1246 lbs) 535 kg (1180 lbs)

G23 G26

3

(54.8 cu.in.) 1001 cm3 (61.1 cu.in.)

API Service Classification CD, CE or CF

Below 0 °C (32 °F) : SAE10W, SAE10W-30 or 15W-40

0 to 25 °C (32 to 77 °F) : SAE20, SAE10W-30 or 15W-40

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

No.2-D diesel fuel (ASTM D975)

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

-1

(rpm)

-1

(rpm)

2

, 1991 psi)

I-9

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

INFORMATION

Model

Model RCK48-G23 RCK54-G26

Total length 895 mm (35.2 in.) 980 mm (38.6 in.)

Total width 1266 mm (49.8 in.) 1418 mm (55.8 in.)

Total height 400 mm (15.8 in.)

Mounting method Quick joint, parallel linkage

Mower

Grass
collector

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

Adjustment of cutting height Dial gauge

Cutting width 1219 mm (48.0 in.) 1372 mm (54.0 in.)

Cutting height 25 to 102 mm (1.0 to 4.0 in.)

Number of blades 2

Weight (Approx.) 120 kg (265 lbs) 135 kg (298 lbs)

Discharge direction Rear side

Model GCK-G23LD GCK-G26HD

Container capacity 560 L (148 U.S.gals, 110 Imp.gals) 640 L (169 U.S.gals, 141 Imp.gals)

Weight (Approx.) 35 kg (77 lbs) 220 kg (485 lbs)

Dumping height – 1930 mm (76.0 in.)

LD HD LD HD

G23 G26

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I-10

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KiSC issued 08, 2009 A

4. DIMENSIONS

LD

INFORMATION

I-11

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G23, G26, WSM

KiSC issued 08, 2009 A

HD

INFORMATION

I-12

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G GENERAL

KiSC issued 08, 2009 A

GENERAL

KiSC issued 08, 2009 A

CONTENTS

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

[1] SERIAL NUMBER .................................................................................................................. G-1

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

2. GENERAL PRECAUTIONS.......................................................................................................... G-3

3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING .................................... G-4

[1] WIRING .................................................................................................................................. G-4

[2] BATTERY ............................................................................................................................... G-6

[3] FUSE ...................................................................................................................................... G-6

[4] CONNECTOR ........................................................................................................................ G-6

[5] HANDLING OF CIRCUIT TESTER ........................................................................................ G-7

[6] COLOR OF WIRING ..............................................................................................................G-8

4. LUBRICANTS, FUEL AND COOLANT......................................................................................... G-9

5. TIGHTENING TORQUES ........................................................................................................... G-12

[1] GENERAL USE SCREWS, BOLTS AND NUTS .................................................................. G-12

[2] STUD BOLTS ....................................................................................................................... G-12

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

THREADS ............................................................................................................................ G-13

[4] PLUGS ................................................................................................................................. G-13

6. MAINTENANCE CHECK LIST ................................................................................................... G-14

7. CHECK AND MAINTENANCE ................................................................................................... G-16

[1] DAILY CHECK...................................................................................................................... G-16

(1) Walking Around the Machine.......................................................................................... G-16

(2) Mower............................................................................................................................. G-19

(3) While Sitting on the Operator's Seat .............................................................................. G-19

(4) Turning the Key Switch "ON".......................................................................................... G-19

(5) Starting the Engine ......................................................................................................... G-19

(6) Others............................................................................................................................. G-20

[2] CHECK POINTS OF INITIAL 50 HOURS ............................................................................ G-20

[3] CHECK POINTS OF EVERY 50 HOURS ............................................................................ G-22

[4] CHECK POINTS OF EVERY 100 HOURS .......................................................................... G-37

[5] CHECK POINT OF EVERY 150 HOURS ............................................................................. G-38

[6] CHECK POINTS OF EVERY 200 HOURS .......................................................................... G-39

[7] CHECK POINTS OF EVERY 400 HOURS .......................................................................... G-44

[8] CHECK POINT OF EVERY 1500 HOURS ........................................................................... G-45

[9] CHECK POINT OF EVERY 3000 HOURS ........................................................................... G-45

[10]CHECK POINT OF EVERY 1 YEAR .................................................................................... G-45

[11]CHECK POINTS OF EVERY 2 YEARS ............................................................................... G-45

[12]OTHERS............................................................................................................................... G-49

8. SPECIAL TOOLS ....................................................................................................................... G-54

[1] SPECIAL TOOLS FOR ENGINE .......................................................................................... G-54

[2] SPECIAL TOOLS FOR TRACTOR ...................................................................................... G-59

9. TYRE PRESSURE AND WHEEL ............................................................................................... G-61

[1] TYRE PRESSURE ............................................................................................................... G-61

[2] WHEEL................................................................................................................................. G-61

10. IMPLEMENT LIMITATIONS ....................................................................................................... G-62

G23, G26, WSM

KiSC issued 08, 2009 A

1. TRACTOR IDENTIFICATION

[1] SERIAL NUMBER

When contacting your local KUBOTA distributor, always specify

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

(1) Machine Serial Number
(2) Engine Serial Number

GENERAL

(3) Mower Serial Number

(To be continued)

G-1

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G23, G26, WSM

KiSC issued 08, 2009 A

(Continued)

GENERAL

(4) Grass Catcher Serial Number (LD)
(5) Grass Catcher Serial Number (HD)

(6) Hour Meter / Tachometer

9Y1210294GEG0001US0

[2] CYLINDER NUMBER

You can see the cylinder numbers of KUBOTA diesel engine in
the figure. The sequence of cylinder numbers is No. 1, No. 2 and
No. 3 and it starts from the gear case side.

WSM000001GEG0056US0

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KiSC issued 08, 2009 A

2. GENERAL PRECAUTIONS

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

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

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

• Remove oil and dirt from parts before you measure.

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

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

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

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

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

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

GENERAL

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

WSM000001GEG0092US0

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G23, G26, WSM

IMPORTANT

KiSC issued 08, 2009 A

GENERAL

3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING

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

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

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

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

(1) Negative Terminal (2) Positive Terminal

WSM000001GEG0062US1

[1] WIRING

• Securely tighten wiring terminals.

(1) Correct

(Securely Tighten)

(2) Incorrect

(Loosening Leads to Faulty Contact)

WSM000001GEG0063US1

• Do not let wiring contact dangerous part.

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

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

• Securely insert grommet.

(1) Grommet (A) Correct

(B) Incorrect

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(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

• Securely clamp, being careful not to damage wiring.

(1) Clamp

(Wind Clamp Spirally)

(2) Wire Harness

(3) Clamp
(4) Welding Dent

WSM000001GEG0067US1

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

(1) Wiring
(2) Clamp

(A) Correct
(B) Incorrect

WSM000001GEG0068US1

• In installing a part, take care not to get wiring caught by it.

(1) Wiring (A) Incorrect

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

(1) Cover

(Securely Install Cover)

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G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

[2] BATTERY

GENERAL

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

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

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

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

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

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

• Before recharging the battery, r emove it fro m the ma chine.

• Before recharging, remove cell caps.

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

WSM000001GEG0071US1

[3] FUSE

[4] CONNECTOR

• Use fuses with specified capacity.
Neither too large or small capacity fuse is acceptable.

• Never use steel or copper wire in place of fuse.

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

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

(1) Fuse
(2) Fusible Link

(3) Slow Blow Fuse

WSM000001GEG0072US1

• For connector with lock, push lock to separate.

(A) Push

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• In separating connectors, do not pull wire harnesses.

• Hold connector bodies to separate.

(A) Correct (B) Incorrect

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G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

• Use sandpaper to remove rust from terminals.

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

(1) Exposed Terminal
(2) Deformed Terminal

(3) Sandpaper
(4) Rust

WSM000001GEG0075US1

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

(A) Correct (B) Incorrect

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• Make certain plastic cover is large enough to cover whole
connector.

(1) Cover (A) Correct

(B) Incorrect

WSM000001GEG0077US1

[5] HANDLING OF CIRCUIT TESTER

• Use tester correctly following manual provided with tester.

• Check for polarity and range.

WSM000001GEG0078US1

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G23, G26, WSM

KiSC issued 08, 2009 A

[6] COLOR OF WIRING

GENERAL

• Colors of wire are specified to the color codes.

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

(An example)

Red stripe on white color : W/R

Color of wiring Color code

Black B

Brown Br

Green G

Gray Gy or Gr

Blue L

Light Green Lg

Orange Or

Pink P

Purple Pu or V

Red R

Sky Blue Sb

White W

Yell ow Y

(1) Wire Color (2) Stripe

WSM000001GEG0079US0

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G23, G26, WSM

KiSC issued 08, 2009 A

4. LUBRICANTS, FUEL AND COOLANT

Capacities

No. Place

LD HD LD HD

1Fuel

Coolant

2

(with recovery tank)

3 Engine crankcase

4 Transmission case

5 Mower gear box

3.1 L

3.3 U.S.qts

2.7 Imp.qts

3.1 L*

3.3 U.S.qts

2.7 Imp.qts

1.9 L

2.0 U.S.qts

1.7 Imp.qts

20.5 L

5.4 U.S.gals

4.5 Imp.gals

3.3 L

3.5 U.S.qts

2.9 Imp.qts

3.5 L*

3.7 U.S.qts

3.1 Imp.qts

11.0 L

11. 6 U.S.qts

9.7 Imp.qts

2.1 L

2.2 U.S.qts

1.8 Imp.qts

• No. 2-D diesel fuel

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

Fresh clean water with anti-freeze

Engine oil

API Service Classification CD, CE
or CF

• Above 25 °C (77 °F)
SAE30W,
SAE10W-30 or 15W-40

• 0 to 25 °C (32 to 77 °F)
SAE20, SAE10W-30 or 15W-40

• Below 0 °C (32 °F)
SAE10W,
SAE10W-30 or 15W-40

KUBOTA UDT or SUPER UDT fluid*

KUBOTA UDT or SUPER UDT fluid*

GENERAL

LubricantsG23 G26

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G23, G26, WSM

NOTE

IMPORTANT

KiSC issued 08, 2009 A

No. Place

Front axle (King pin) 2

Front axle (Centre pin) 1

Brake pedal 7

HST speed change
pedal

HST pedal boss 1

Tension PTO arm 1

PTO 1

Parking lock pedal 2

Cruise control 2

Differential lock pedal 4

Cutting height cam 3

Under duct 5

Sensor rod 2

Duct cleanup system 3

6

Seat adjuster 4

Throttle cable 1 Moderate amount Oil

Mower universal joint 5

Mower lift cylinder 5

Front RH link 1

Front link 3

Rear link 2

Link arm front 2

Link arm rear 2

Dump cylinder 2 – 2 –

Bush 4–4–

Lock lever 2–2–

Grass catcher – 10 – 10

Grass container lift
cylinder

Dump flap –2–2

Greasing

No. of greasing point

LD HD LD HD

2

–4–4

Capacity Type of greaseG23 G26

Until grease overflows

Until grease overflows

GENERAL

Multipurpose EP2 grease
(NLGI Grade No.2)

Multipurpose EP2 grease
(NLGI Grade No.2)

• * KUBOTA original transmission hydraulic fluid.

• To prevent serious damage to hydraulic system, use only KUBOTA genuine fluid or its equivalent.

G-10

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(EU)

G23, G26, WSM

NOTE

KiSC issued 08, 2009 A

GENERAL

Engine Oil :

• Oil used in the engine should have an American Petroleum Institute (API) service classification and
Proper SAE Engine Oil according to the ambient temperatures as shown in the table.

• With the emission control now in effect, the CF-4 and CG-4 lubricating oils have been developed for use
of a low-sulfur fuel on on-road vehicle engines. When an off-road vehicle engine runs on a high-sulfur
fuel, it is advisable to emplo y the CF, CD or CE lubricating oil with a high total base number. If the CF-4
or CG-4 lubricating oil is used with a high-sulfur fuel, change the lubricating oil at shorter intervals.

• Lubricating oil recommended when a low-sulfur or high-sulfur fuel is employed.

P : Recommendable X : Not Recommendable

Lubricating

oil class

Low-sulfur High-sulfur

Fuel

Remark

CF PPTBN ≥ 10

CF-4 P X

CG-4 P X

Transmission oil (KUBOTA SUPER UDT *1) :

• KUBOTA Original Transmission hydraulic fluid
The oil used to lubricate the transmission is also used as hydraulic fluid. To insure proper operation of
the hydraulic system and complete lubrication of the transmission, it is important that a multi-grade
transmission fluid be used in this system. We recommend the use of KUBOTA UDT or SUPER UDT fluid
for optimum protection and performance.
Do not mix different brands together.

• Indicated capacity of water and oil are manufacturer's estimate.

9Y1210294GEG0003US0

G-11

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

5. TIGHTENING TORQUES

[1] GENERAL USE SCREWS, BOLTS AND NUTS

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

tightened according to the table b elow .

Indication on top of bolt

Indication on top of nut

Material of opponent part Ordinariness Aluminum Ordinariness Aluminum Ordinariness

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

7.9

0.80

M6

M8

M10

M12

M14

M16

M18

M20

to

9.3

18

to

20

40

to

45

63

to

72

108

to

125

167

to

191

246

to

284

334

to

392

to

0.95

1.8
to

2.1

4.0
to

4.6

6.4
to

7.4

11. 0
to

12.8

17.0
to

19.5

25.0
to

29.0

34.0
to

40.0

No-grade or 4T 7T 9T

No-grade or 4T

5.8

7.9

0.80

5.8

9.81

1.00

7.24

7.9

0.80

5.8

12.3

to

to

to

to

to

to

to

to

to

to

6.8

8.8

0.90

6.5

13

17

1.7

to

to

15

19

29

32

to

to

33

34

47

to 53–––

79.6
to

–––

92.5

123

to

–––

141

181

to

–––

209

246

to

–––

289

to

2.0

3.2
to

3.5

13

to

14

24

to

25

11. 2

24

to

27

48

to

55

78

to

90

124

to

147

197

to

225

275

to

318

368

to

431

1.15

2.4
to

2.8

4.9
to

5.7

7.9
to

9.2

12.6
to

15.0

20.0
to

23.0

28.0
to

32.5

37.5
to

44.0

8.31

18

to

20

36

to

41

58

to

66

91.2
to

108

145

to

166

203

to

235

272

to

318

8.8

0.90

18

1.8

to

to

20

2.1

40

4.0

to

to

44

4.5

63

6.4

to

to

72

7.4

–––

–––

–––

–––

to

6.5

14.2

13

30

to

to

15

34

29

61

to

to

32

70

47

103

to

to

53

117

167

to

196

260

to

304

344

to

402

491

to

568

WSM000001GEG0001US1

6T

1.25
to

1.45

3.0
to

3.5

6.2
to

7.2

10.5
to

12.0

17.0
to

20.0

26.5
to

31.0

35.0
to

41.0

50.0
to

58.0

9.05
to

10.4

22

to

25

45

to

52

76.0
to

86.7

123

to

144

192

to

224

254

to

296

362

to

419

[2] STUD BOLTS

Material of opponent part Ordinariness Aluminum

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

12

1.2

8.7

8.9

0.90

M8

M10

M12

M14

M16

M18

to

15

25

to

31

30

to

49

62

to

73

98.1
to

112

172

to

201

to

to

to

1.6

11

11

2.5

18

to

3.2

3.0
to

5.0

6.3
to

7.5

10.0
to

11. 5

17.5
to

20.5

20

to

to

23

25

22

to 3631 3.2 23

46

to 54–––

72.4
to

–––

83.1

127

to

–––

148

to

1.2

2.0
to

2.6

6.5
to

8.6

15

to

18

G-12

WSM000001GEG0002US1

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

[3] AMERICAN STANDARD SCREWS, BOLTS AND NUTS WITH

UNC OR UNF THREADS

Grade

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

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

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

3/8 48 to 56 4.9 to 5.7 36 to 41 61 to 73 6.3 to 7.4 45 to 53
1/2 110 to 130 11.3 to 13.2 81.2 to 95.8 150 to 178 15.3 to 18.1 111 to 131

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

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

SAE GR.5 SAE GR.8

WSM000001GEG0008US1

[4] PLUGS

Material of opponent part

Shape Size

N·m kgf·m lbf·ft N·m kgf·m lbf·ft

Tapered screw

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

R1/8 13 to 21 1.3 to 2.2 9.4 to 15 13 to 19 1.3 to 2.0 9.4 to 14
R1/4 25 to 44 2.5 to 4.5 18 to 32 25 to 34 2.5 to 3.5 18 to 25
R3/8 49 to 88 5.0 to 9.0 37 to 65 49 to 58 5.0 to 6.0 37 to 43
R1/2 58.9 to 107 6.00 to 11.0 43.4 to 79.5 59 to 78 6.0 to 8.0 44 to 57

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

Ordinariness Aluminum

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

WSM000001GEG0005US1

G-13

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

6. MAINTENANCE CHECK LIST

GENERAL

Indication on hour meter

No. Item

1 Engine oil Change +333

2 Engine oil filter Replace +333

3 Transmission fluid Change 3

4 Transmission oil filter Replace +333

5 Transmission strainer Clean 3

6 Front axle pivot Adjust 333

7 Safety device Check 333333333333

8 Oiling – 333333333333

9 Greasing – 333333333333

Check 333333333333

10 Mower gear box oil

Change +3 3 3 3

Clean 333333333333

11 Air cleaner element

Replace

12 Battery condition Check 333333333333

13 Battery charging Check 333333333333

14 Front PTO belt tension Adjust 333333333333

15 Brake Adjust 333333

16 Fan drive belt Check 333333

17 HST neutral spring Adjust 333333

Check 333333

18 Fuel filter element

Replace 3

Check 333333

19 Fuel line

Replace

Check 333

20 Hydraulic hose

Replace

Check 333

21 Radiator hose and clamp

Replace

Check 333

22 Intake air line

Replace

Fuel injection nozzle

23

(injection pressure)

Check

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

200 Hr

200 Hr

400 Hr

200 Hr

400 Hr

200 Hr

150 Hr

every 1

100 Hr

100 Hr

100 Hr

100 Hr

400 Hr

100 Hr

every 2

200 Hr

every 2

200 Hr

every 2

200 Hr

every 2

1500 Hr

After
since

every

every

every

every

every

every

every
50 Hr

every
50 Hr

every
50 Hr

every
50 Hr

every

every
50 Hr

year

every
50 Hr

every
50 Hr

every
50 Hr

every

every

every

every

every

every

years

every

years

every

years

every

years

every

Refer-

ence
page

G-20

G-20

G-44

G-21

G-44

G-40

G-22

G-23

G-24

G-31

G-38

G-32 *1

G-45

G-33

G-34

G-36 *3

G-37

G-37

G-37

G-38

G-45

G-38

G-45

G-41

G-45

G-43

G-45

G-43

G-46 *2

1-S22 @

Impor-

tant

@

@

@

@

G-14

(EU)

G23, G26, WSM

IMPORTANT

KiSC issued 08, 2009 A

GENERAL

Indication on hour meter

No. Item

24 Injection pump Check

25 Radiator Clean

26 Coolant Change

27 Anti-Freeze –

28 Mower gear box oil seal Replace

29 Fuel system Bleed

30 Fuse Replace G-50

31 Blade Replace G-51

32 Light Bulb Replace G-52

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

3000 Hr

every 2

every 2

every 2

every 2

Service

as Re­quired

After
since

every

years

years

years

years

Refer-

Impor-

ence
page

G-45 @

G-47

G-47

G-47

G-46

G-49

tant

• The jobs indicated by + must be done initially.

• *1 : This maintenance should be done daily more often in dusty condition than in normal conditions.
Suggested cleaning interval is every 100 hours in normal conditions.
*2 : Replace only if necessary.
*3 : Initial elongation of the front PTO belt may occur prior to 25 hours.
Adjust the tension spring length as needed to maintain belt tension.

• 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.

9Y1210294GEG0004US0

G-15

(EU)

G23, G26, WSM

CAUTION

CAUTION

CAUTION

IMPORTANT

KiSC issued 08, 2009 A

GENERAL

7. CHECK AND MAINTENANCE

• Be sure to check and service the machine on a level surface with the engine shut off and the parking brake
"ON" and implement lowered to the ground.

9Y1210294GEG0005US0

[1] DAILY CHECK

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

To avoid personal injury :

• Be sure to check and service the machine on a level surface with the engine shut off, the ley removed and
the parking brake securely set.

9Y1210294GEG0006US0

(1) Walking Around the Machine

1. Tyre pressure, wear and damage.

2. Oil and water leak.

3. Engine oil level.

4. Transmission fluid level.

5. Coolant level in the recovery tank.

6. Damage of machine body, tightness of all bolts and nuts.

7. Radiator screen.

8. Panel screen.

9. Brake free travel.

10. Fuel level.

11. Check air cleaner.

9Y1210294GEG0007US0

Checking Engine Oil Level

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
lines between the two notches.
If the level is too low, add new oil to the prescribed level at the
oil inlet. (Refer to "LUBRICANTS, FUEL AND COOLANT" in this
section.)

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

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

(1) Oil Inlet
(2) Dipstick

A : Oil level is acceptable within this

range.

9Y1210294GEG0008US0

G-16

(EU)

G23, G26, WSM

CAUTION

IMPORTANT

NOTE

KiSC issued 08, 2009 A

GENERAL

Checking and Refueling

To avoid personal injury :

• Do not smoke while refueling.

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

• Handle fuel carefully. If the engine is running, d o not fill the
fuel tank. If engine is hot, let engine cool several minutes
before adding fuel. Do not smoke while filling the fuel tank
or servicing the fuel system. Fill fuel tank only to bottom of
filler neck.

• To avoid allergic skin reaction : Wash hands immediately
after contact with diesel fuel.

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

gauge.

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

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

20.5 L

Fuel tank capacity

5.4 U.S.gals

4.5 Imp.gals

• 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 ble eding before
next engine start.

• Be careful not to spill during refueling. If 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.

• No2-D is a distillate fuel of lower volatility for engines in
industrial and heavy mobile service. (SAE J313 JUN87)

• Grade of Diesel Fuel Oil according to ASTM D975

Water and

Flash point °C

Min Max Max Max

52 0.05 0.35 0.01

Distillation

temperatures

°C 90 %

point

Min Max Min Max Min Max Max Max Min

282 338 1.9 4.1 32.6 40.1 0.50 No.3 40

sediment,
volume %

Viscosity

kinematic cSt

or mm

at 40 °C

2

/s

Carbon residue

on, 10 percent

residuum, %

Viscosity

saybolt,

SUS

at 37.8 °C

Sulfur

weight

%

Ash, weight %

Cop

per

strip

corro-

sion

Cetane

number

(1) Fuel Tank Cap

G-17

9Y1210294GEG0009US0

(EU)

G23, G26, WSM

CAUTION

NOTE

IMPORTANT

WARNING

CAUTION

KiSC issued 08, 2009 A

GENERAL

Checking and Cleaning Panel and Radiator Screen

To avoid personal injury :

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

1. Check the panel screens to be sure they are clean from debris.

2. Detach the lower panel plate.

• If the dust or chaff is accumulated in the battery
compartment, clean it thoroughly.

3. Detach the radiator screen, and then remove all the foreign
material.

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

• Be sure to reinstall the panel on the pillar completely to
prevent the invasion of dust.

• Be sure to stop the engine to avoid personal injury and to
allow good air intake for air cleaner.

(1) Panel
(2) Knob
(3) Centre Pillar
(4) Radiator Screen

A : Detach

9Y1210294GEG0010US0

Checking Tyre Pressure

To avoid personal injury :

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

• Always maintain the correct tyre pressure.
Do not inflate tyres above the recommended pressure
shown in the Operator's Manual.

• Inflation pressure in front tyres rises quickly when using
compressed air.

Never operate machine with a loose rim, wheel, or axle.

• Whenever bolts are loosened, retighten to specified torque.

• Check all bolts frequently and keep them tightened.

Q Inflation Pressure

Though the inflation 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.

Tyre Sizes

Front 16 × 7.50-8, Turf

Rear 24 × 12.00-12, Turf

(1) Ground (A) Insufficient

(B) Normal
(C) Excessive

Recommended Inflation

Max. Pressure

2

120 kPa (1.2 kgf/cm

17.4 psi)

100 kPa (1.0 kgf/cm

14.5 psi)

9Y1210294GEG0074US0

,

2

,

G-18

(EU)

G23, G26, WSM

IMPORTANT

CAUTION

IMPORTANT

KiSC issued 08, 2009 A

GENERAL

Checking Transmission Fluid Level

1. Park the machine on a flat surface, raise the mower and lower
the grass catcher and shut off engine.

2. To check the oil level, draw out the dipstick (2), 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 (1). (Refer to
"LUBRICANTS, FUEL AND COOLANT" in this section.)

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

(1) Oil Inlet
(2) Dipstick

A : Oil level is acceptable within this

range.

9Y1210294GEG0012US0

Checking Coolant Level

To avoid personal injury :

• Be sure to stop the engine and remove the key before
checking coolant level.

• Do not remove the 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 Highest level
and Lowest level marks of recovery tank (1).

2. When the coolant level drops due to evaporation, add water
only. In case of leakage, add anti-freeze and water in the

specified mixing ratio up to the Highest level.

(See page G-47.)

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

• Use clean, distilled water and anti-freeze to fill the radiat or.

(1) Recovery Tank A : Highest Level

(2) Mower

1. Oil leak.

2. Make sure blade cap screws are tight.

3. Blade wear or damage.

4. Check all hardware.

5. Make sure all pins are in place.

6. Mower deck cleaning.

(3) While Sitting on the Operator's Seat

1. Speed control pedal and brake pedal.

2. Brake lock.

(4) Turning the Key Switch "ON"

1. Performance of the easy checker light.

(5) Starting the Engine

1. Color of the exhaust fumes.

2. Safety start switch, seat safety control and another safety devices.

3. Check for abnormal noise and vibration.

B : Lowest Level

9Y1210294GEG0013US0

9Y1210294GEG0014US0

9Y1210294GEG0015US0

9Y1210294GEG0016US0

9Y1210294GEG0017US0

G-19

(EU)

G23, G26, WSM

CAUTION

CAUTION

IMPORTANT

KiSC issued 08, 2009 A

(6) Others

1. Check the areas where previous trouble was experienced.

[2] CHECK POINTS OF INITIAL 50 HOURS

Changing Engine Oil

To avoid personal injury :

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

• Allow engine to cool down sufficiently; oil can be hot and
may cause burns.

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).

3. Fill with the new oil up to the upper notch on the dipstick (2).
(Refer to "LUBRICANTS, FUEL AND COOLANT" in this
section.)

4. Properly dispose of used oil.

Oil capacity with filter

G23

G26

GENERAL

9Y1210294GEG0018US0

3.1 L

3.3 U.S.qts

2.7 Imp.qts

3.5 L

3.7 U.S.qts

3.1 Imp.qts

(1) Oil Inlet
(2) Dipstick
(3) Drain Plug
(4) Front Tyre (LH)

A : Oil lever is acceptable within this

range.

9Y1210294GEG0019US0

Replacing Engine Oil Filter

To avoid personal injury :

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

• Allow engine to cool down sufficiently; oil can be hot and
may cause burns.

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

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

5. Properly dispose of used oil.

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

(1) Engine Oil Filter

9Y1210294GEG0020US0

G-20

(EU)

G23, G26, WSM

CAUTION

IMPORTANT

CAUTION

KiSC issued 08, 2009 A

GENERAL

Replacing Transmission Oil Filter

To avoid personal injury :

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

1. Remove the oil filter.

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

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

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

5. Properly dispose of used oil.

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

(1) Transmission Oil Filter

9Y1210294GEG0075US0

Checking Gear Box Oil

To avoid personal injury :

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

• Remove the right and left hand shields from the mower
deck.

1. To drain the used oil, remove the oil level dipstick and the drain
plugs (2) at the gear box, tilt the mower deck and drain the oil
completely into the oil pan.

2. Reinstall the drain plugs (2). (Refer to "LUBRICANTS, FUEL
AND COOLANT" in this section.)

3. Fill with the new oil.

4. After filling, reinstall the oil level dipstick (1).

(1) Oil level Dipstick (2) Drain Plug

9Y1210294GEG0076US0

G-21

(EU)

G23, G26, WSM

CAUTION

IMPORTANT

KiSC issued 08, 2009 A

[3] CHECK POINTS OF EVERY 50 HOURS

Checking Safety Devices

The Safety Device in your machine are designed to protect you
while operating. Please check these Safety Devices periodically ­da ily is best - to tes t function of the Safety Devices before operation.

To avoid personal injury :

• Do not allow anyone near the machine while testing.

• If the machine does not pass one of the following tests, do
not operate the machine.

• Check the following tests before operating the machine.

Q Checking Safety Devices

1. Check the following tests before operating the mower.
Sit on the operator's seat for all tests.

2. If the machine does not pass one of the following tests, do not
operate the machine.

Q Safety Start Control 1

1. Depress the brake pedal fully.

2. Engage the PTO lever.

3. Turn the key switch to the "START" position.

4. The engine should not crank.

Q Safety Start Control 2

1. Disengage the PTO lever.

2. Release the brake pedal.

3. Turn the key to the "START" position.

4. The engine should not crank.

Q Seat Safety Control 1

1. Run the engine at half throttle.

2. Engage the PTO lever.

3. Stand up. (DO NOT GET OFF THE MACHINE.)

4. Engine should shut off.

Q Seat Safety Control 2

1. Run the engine at half throttle.

2. Disengage the PTO lever.

3. Release the brake pedal.

4. Stand up. (DO NOT GET OFF THE MACHINE.)

5. Engine should shut off.

Q PTO Safety Control 1

1. Dismount the container from the platform.

2. Run the engine at half throttle.

3. Engage the PTO lever.

4. Engine should shut off.

Q PTO Safety Control 2

1. Run the engine at half throttle.

2. Engage the PTO lever.

3. Dump or lift up the grass catcher.

4. Engine should shut off.

(1) PTO (Clutch) Lever
(2) Brake Pedal

GENERAL

[A] G23
[B] G26

9Y1210294GEG0023US0

G-22

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Oiling

To avoid personal injury :

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

1. Oil the location shown in the figures.

(1) Throttle Cable (G23)
(2) Throttle Cable (G26)

[A] G23
[B] G26

9Y1210294GEG0024US0

G-23

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Greasing 1

To avoid personal injury :

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

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

(1) Front Axle
(2) Front Axle
(3) Brake Pedal Link

(4) Brake Pedal Link
(5) Brake Pedal Link

9Y1210294GEG0025US0

G-24

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Greasing 2

To avoid personal injury :

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

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

(1) Brake Pedal Link
(2) HST Speed Change Pedal Dumper
(3) HST Speed Change Pedal Dumper

(4) HST Pedal Boss
(5) PTO Tension Arm
(6) PTO Shaft

9Y1210294GEG0026US0

G-25

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Greasing 3

To avoid personal injury :

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

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

(1) Parking Lock Pedal Link
(2) Cruise Control Link
(3) Def. Lock Pedal Link

(4) Def. Lock Pedal Link
(5) Rear Tyre (LH)

9Y1210294GEG0027US0

G-26

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Greasing 4

To avoid personal injury :

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

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

(1) Mower Lift Arm Rear (RH)
(2) Duct Cleanup System Link
(3) Sensor System Pivot
(4) Duct Cleanup System Link

(5) Duct Cleanup System Link
(6) Universal Joint
(7) Grease Nipple

9Y1210294GEG0028US0

G-27

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Greasing 5

To avoid personal injury :

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

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

(1) Mower Lift Cylinder
(2) Mower Lift Link
(3) Mower Lift Arm Front (LH)

(4) Mower Lift Link
(5) Mower Lift Arm Rear (LH)

9Y1210294GEG0029US0

G-28

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Greasing 6

To avoid personal injury :

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

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

(1) Mower Lift Arm Front (RH)
(2) Mower Lift Link Rear (RH)
(3) Dump Cylinder (LD)

(4) Dumper Cylinder (LD)
(5) Grass Container Rotation Pivot (LD)

9Y1210294GEG0030US0

G-29

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Greasing 7

To avoid personal injury :

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

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

(1) Lock Lever (LD)
(2) Grass Catcher (HD)

(3) Grass Container Lift Cylinder (HD)

9Y1210294GEG0031US0

G-30

(EU)

G23, G26, WSM

CAUTION

CAUTION

NOTE

IMPORTANT

KiSC issued 08, 2009 A

GENERAL

Greasing 8

To avoid personal injury :

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

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

(1) Dump Flap (HD)
(2) Seat Pivot

(3) Seat Adjuster

9Y1210294GEG0032US0

Checking Gear Box Oil Level

To avoid personal injury :

• Always stop the engine and remove the key before
checking oil.

1. Park the machine on a flat surface and lower the mower to the
ground.
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.
(Refer to "LUBRICANTS, FUEL AND COOLANT" in this
section.)

• Check the oil level of the transmission case with the mower
lifted up.

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

(1) Oil level Dipstick A : Oil level is acceptable within this

range

9Y1210294GEG0033US0

G-31

(EU)

G23, G26, WSM

CAUTION

NOTE

IMPORTANT

KiSC issued 08, 2009 A

GENERAL

Cleaning Air Cleaner Element

To avoid personal injury :

• Be sure to stop engine and remove the key bef ore cleaning
air cleaner element.

1. Remove the air cleaner cover and element.
a) Undo the hook.
b) Turn the cover clockwise and detach it.

2. Clean the 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

2

, 30 psi)

b) When carbon or oil adheres to the element, soak the

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

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

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

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

• Do not run the engine with the filter element removed.

• Align the arrow marks when reinstalling the cover. If the
cover is improperly fitted, dust passes by the baffle and
directly adheres to the element.

Q Evacuator valve

Open the evacuator valve one a week under ordinary conditions

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

(1) Element (G23)
(2) Cover (G23)
(3) Evacuator Valve (G23)

(4) Element (G26)
(5) Cover (G26)
(6) Evacuator Valve (G26)

9Y1210294GEG0034US0

G-32

(EU)

G23, G26, WSM

DANGER

CAUTION

KiSC issued 08, 2009 A

GENERAL

Checking Battery Condition

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

• Do not use or charge the refillable type battery if the fluid
level is below the LOWER (lower limit level) mark.
Otherwise, the battery component parts may prematurely
deteriorate, which may shorten the battery's service life or
cause an explosion. Check the fluid level regularly and add
distilled water as required so that the fluid level is between
the UPPER and LOWER levels.

To avoid personal injury :

• Never remove the vent caps while the engine is running.

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

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

Mishandling the battery (1) shortens the service life and adds to

maintenance costs.

The original battery (1) is maintenance free, but needs some

servicing.

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

lights will be dim. It is important to check the battery (1) periodically.

(1) Battery

9Y1210294GEG0035US0

G-33

(EU)

G23, G26, WSM

DANGER

CAUTION

KiSC issued 08, 2009 A

GENERAL

Checking Battery Charging

To avoid serious 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.

To avoid personal injury :

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

• When disconnecting the cables from the battery, start with
the negative terminal first.
When connecting the cables 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.

(For accessible maintainable type batteries with removable vent

caps.)

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

2. The water in the electrolyte (3) evaporates during recharging.
Liquid shortage damages the battery. Excessive liquid spills
over and damages the machine body.

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

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

5. When the specific gravity of electrolyte reaches 1.27 to 1.29
charge has completed.

6. When exchanging an old battery with new one, use a battery of
equal specification shown in "SPECIFICATIONS".

(1) Vent Well
(2) Separator
(3) Electrolyte

A : Highest Level
B : Lowest Level

(To be continued)

G-34

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

(Continued)

GENERAL

(For non-accessible maintenance-free type batteries.)

Maintenance-free, non-accessible batteries are designed to
eliminate the need to add water. Yet the volume of electrolyte above
plates may eventually become depleted due to abnormal conditions
such as high heat or improper regulator setting. Use a voltmeter to
check the state of charge. (See reference chart below to determine
if charging is necessary.)

Battery voltage Reference state of charge

12.6 100 % (Full charge)

12.4 75 %

12.2 50 %

12.0 25 %

11. 8 0%

Q Direction for storage

1. When storing the machine for a long period, remove the battery

from the machine, 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.

9Y1210294GEG0036US0

G-35

(EU)

G23, G26, WSM

CAUTION

IMPORTANT

KiSC issued 08, 2009 A

GENERAL

Adjusting Front PTO Belt Tension

To avoid personal injury :

• Always stop the engine, set the parking brake, remove the
key, and disengage the PTO lever before working on the
front PTO.

Q Adjusting

If the PTO belts slip when the PTO is operating under load,

check the front PTO belt tension and adjust the tension spring
length, as explained below.

[G23]

1. Remove the engine cover (1).

2. Remove the covers.

3. Engage the PTO lever.

4. Measure tension spring (5) length "L".

5. If "L" is shorter than 88 mm (3.46 in.), adjust it with the tension

clutch cable adjusting nut (6).

"L" should be 88 to 91 mm (3.46 to 3.58 in.).

6. After adjustment, tighten the nut securely.

7. Check the stay is contacting with the tension arm (8). If not,
make the stay contact with the tension arm (8) by loosening the
bolt. Then tighten the bolt again.

8. Attach the covers and engine cover (1).

9. Disengage the PTO lever.

(Reference)

• Spring Length "L" : 88 to 91 mm (3.46 to 3.58 in.)

[G26]

1. Remove the cover.

2. Measure tension spring (12) length "L".

3. If "L" is shorter than 113 mm (4.45 in.), adjust it with the tension

clutch cable adjusting nut.

"L" should be 113 to 117 mm (4.45 to 4.61 in.).

4. After adjustment, tighten the nut securely.

5. Attach the cover (11).

(Reference)

• Spring Length "L" : 113 to 117 mm (4.45 to 4.61 in.)

• When replacing the front PTO belts, be sure to replace the
complete set. These belts are a matched set.

(1) Engine Cover
(2) Cover 1
(3) Cover 2
(4) Cover 3
(5) Tension Spring
(6) Adjusting Nut
(7) Rear Tyre (LH)
(8) Tension Arm
(9) Stay

G-36

(10) Bolt
(11) Cover
(12) Tension Spring
(13) Adjusting Nut

[A] G23
[B] G26
C : Contacting Point
L : Length

9Y1210294GEG0037US0

(EU)

G23, G26, WSM

CAUTION

CAUTION

WARNING

KiSC issued 08, 2009 A

[4] CHECK POINTS OF EVERY 100 HOURS

Adjusting Brake Pedal Free Travel

To avoid personal injury :

• Stop the engine, remove the key, lower the implement to
the ground, and chock the wheels before checking brake
pedal.

• Even if the brake pedal free travel is within the limitation,
adjust the brake pedal following the procedure below.

Proper brake pedal free travel

1. Release the parking brake.

2. Loosen the lock nut and turn the turnbuckle to adjust the rod
length so that the brake pedal free travel is from 35 to 45 mm
(1.4 to 1.8 in.).

3. Retighten the lock nut.

4. Depress the brake pedal several times and make sure the brake
pedal free travel is from 35 to 45 mm (1.4 to 1.8 in.).

(1) Lock Nut
(2) Turnbuckle

Checking Fan Belt Tension

GENERAL

35 to 45 mm

1.4 to 1.8 in.

A : Free Travel

9Y1210294GEG0038US0

To avoid personal injury :

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

Q Adjusting

A deflection of between 7

Proper fan belt tension

to 9 mm (0.3 to 0.4 in.)
when the belt is pressed in
the middle of the span.

1. Stop the engine and remove the key.

2. Apply moderate thumb pressure to belt between pulleys.

3. If tension is incorrect, loosen the alternator mounting bolts (1)
and, using a lever placed between the alternator (2) and the
engine block, pull the alternator (2) out until the deflection of the
belt falls within the acceptable limits.

4. Replace fan belt if it is damaged.

(1) Bolt
(2) Alternator

A : Check the belt tension

9Y1210294GEG0039US0

Adjusting HST Neutral Spring

To avoid personal injury :

• Do not operate if the machine moves on level ground with
foot off speed control pedal.

• If the machine moves on level ground with foot off the
pedal, or, if the pedal is too slow in returning to "NEUTRAL"
position when removing the foot from the pedal, adjust the
HST neutral spring (1).

The HST neutral spring located under the cover on the step can

adjust returning speed of speed control pedal.

(1) HST Neutral Spring (2) Adjusting Nut

9Y1210294GEG0040US0

G-37

(EU)

G23, G26, WSM

CAUTION

IMPORTANT

CAUTION

KiSC issued 08, 2009 A

GENERAL

Checking Fuel Lines and Fuel Filter Element

To avoid personal injury :

• 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.

The fuel line connections should be checked annually or every

100 service hours, whichever comes first.

1. The fuel lines is made of rubber and ages regardless of service
period.

2. After inspection, if the fuel line and clamps are found damaged
or deteriorated, replace them.

3. Check fuel filter (1), if it is clogged by debris or contaminated
with water, replace it.

• When the fuel line is disconnected for maintenance or
repair, close both ends of the fuel line (2) with clean plug of
suitable size to prevent dust and dirt from entering.
Particular care must be taken not to admit dust and dirt into
the fuel system. Entrance of dust and dirt cause
malfunction of the fuel pump.

(1) Fuel Filter
(2) Fuel Line
(3) Pipe Clamp

(4) Fuel Pump and Filter
(5) Fuel Line
(6) Pipe Clamp

9Y1210294GEG0041US0

[5] CHECK POINT OF EVERY 150 HOURS

Checking Gear Box Oil

To avoid personal injury :

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

• Remove the right and left hand shields from the mower
deck.

1. To drain the used oil, remove the oil level dipstick (1) and the
drain plugs (2) at the gear box, tilt the mower deck and drain the
oil completely into the oil pan.

2. Reinstall the drain plugs (2).

3. Fill with the new oil.

4. After filling reinstall the oil level dipstick (1).

(1) Oil level Dipstick (2) Drain Plug

9Y1210294GEG0022US0

G-38

(EU)

G23, G26, WSM

CAUTION

CAUTION

IMPORTANT

KiSC issued 08, 2009 A

[6] CHECK POINTS OF EVERY 200 HOURS

Changing Engine Oil

To avoid personal injury :

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

• Allow engine to cool down sufficiently; oil can be hot and
may cause burns.

1. To drain the used oil, remove the drain plug (3) 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).

3. Fill with the new oil up to the upper notch on the dipstick (2).
(Refer to "LUBRICANTS, FUEL AND COOLANT" in this
section.)

4. Properly dispose of used oil.

G23

Oil capacity with filter

G26

GENERAL

3.1 L

3.3 U.S.qts

2.7 Imp.qts

3.5 L

3.7 U.S.qts

3.1 Imp.qts

(1) Oil Inlet
(2) Dipstick
(3) Drain Plug
(4) Front Tyre (LH)

A : Oil lever is acceptable within this

range.

9Y1210294GEG0043US0

Replacing Engine Oil Filter

To avoid personal injury :

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

• Allow engine to cool down sufficiently; oil can be hot and
may cause burns.

1. Remove the filter cover. (if model with engine filter cover)

2. Remove the oil filter.

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

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

5. After 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.

6. Install the filter cover. (if model with engine filter cover)

7. Properly dispose of used oil.

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

(1) Engine Oil Filter
(2) Engine Filter Cover

G-39

A : Model with the engine filter cover

9Y1210294GEG0042US0

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Replacing Transmission Oil Filter

To avoid personal injury :

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

1. Remove the oil filter.

2. Put a film of clean transmission oil on rubber seal of 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 transmission fluid
level will decrease a little. Make sure that the transmission fluid
does not leak through the seal, and check the fluid level.
Top off if necessary.

5. Properly dispose of used oil.

(1) Transmission Oil Filter

9Y1210294GEG0021US0

Adjusting Front Axle Pivot

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

vibration can occur causing vibration in the steering wheel.

1. Remove the split pin (2), tighten the adjusting nut (1)(tightening
torque 20 N·m, 2.0 kgf·m, 14.5 lbf·ft, then make sure that one of
the nut slots aligns with the split pin hole, tighten the nut slightly
clockwise if necessary to align. Replace the split pin (2).

(1) Adjusting Nut (2) Split Pin

9Y1210294GEG0044US0

G-40

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Checking Hydraulic Hose

To avoid personal injury :

• Be sure to stop the engine and remove the key before
checking power steeling line.

1. Check to see that all lines are tight and not damaged.

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

(1) Power Steering Pressure Hose
(2) Power Steering Pressure Hose
(3) Mower Lift Cylinder Hose

(4) Front PTO Clutch Pressure Hose
(5) Front PTO Delivery Hose

(To be continued)

G-41

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

(Continued)

GENERAL

(6) Front PTO Return Hose
(7) Grass Container Dump Cylinder

Hose (LD)

(8) Grass Container Dump Cylinder

Hose (HD)

(9) Grass Container Lift Cylinder Hose

(HD)

(10) Grass Container Lift Cylinder Hose

(LH)(HD)

(11) Grass Container Dump Cylinder

Hose (HD)

9Y1210294GEG0045US0

G-42

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

GENERAL

Checking Radiator Hose and Clamp

To avoid personal injury :

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

Check to see if radiator hoses are properly secured every 200

hours of operation or six months, whichever comes first.

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

2. Replace hoses and tighten hose clamps securely, if radiator
hoses are swollen, hardened or cracked.

3. Properly dispose of used coolant.

Replace hose and hose clamps every 2 years or earlier if

checked and found that hoses are swollen, hardened or cracked.

Q Precautio n at Overheating

Take the following actions in the event the coolant temperature

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

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

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

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

4. Checking that there is no danger such as burn, get rid of the
causes of overheating.

(1) Radiator Core (2 pcs) (2) Radiator Hose (2 pcs)

9Y1210294GEG0046US0

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.

(1) Hose (G23)
(2) Hose Clamp (G23)
(3) Hose (G26)
(4) Hose Clamp (G26)

[A] G23
[B] G26

9Y1210294GEG0047US0

G-43

(EU)

G23, G26, WSM

CAUTION

NOTE

IMPORTANT

NOTE

KiSC issued 08, 2009 A

[7] CHECK POINTS OF EVERY 400 HOURS

Changing Transmission Fluid

To avoid personal injury :

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

1. To drain the used oil, remove the drain plugs at the bottom of
the transmission case and both sides on the rear axle case and
drain the oil completely into the oil pan.

2. After draining, reinstall the drain plugs. Clean the transmission
strainer. Fill with new KUBOTA SUPER UDT fluid up to the
upper notch on the dipstick. After running the engine for a few
minutes, stop it and check the oil level again, add oil to
prescribed level. Properly dispose of used oil.

Oil capacity

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

GENERAL

11.0 L

11.6 U.S.qts

9.7 Imp.qts

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

(1) Drain Plug
(2) Drain Plug
(3) Rear Tyre (LH)
(4) Oil Inlet
(5) Dipstick

A : Oil level is acceptable within this

range.

9Y1210294GEG0048US0

Cleaning Transmission Strainer

When changing the transmission fluid, disassemble and rinse

the strainer with nonflammable solvent to completely clean off
fillings.

When reassembling, be careful not to damage the parts.

• Since the fine filings in the oil can damage the precision
component parts of the hydraulic system, the end of the
suction line is provided with an oil strainer.

(1) Strainer (2) O-ring

9Y1210294GEG0049US0

G-44

(EU)

G23, G26, WSM

NOTE

KiSC issued 08, 2009 A

GENERAL

Replacing Fuel Filter

1. Disconnect the fuel hoses and replace the fuel filter (3).

2. Disconnect the fuel hoses and loosen the pipe clamps to
replace the fuel filter (5).

• If the fuel hose is removed, be sure to properly bleed the
fuel system. (See page G-49.)

(1) Fuel Hose
(2) Pipe Clamp
(3) Fuel Pump and Filter

(4) Fuel Line
(5) Fuel Filter
(6) Pipe Clamp

9Y1210294GEG0050US0

[8] CHECK POINT OF EVERY 1500 HOURS

Checking Injection Nozzle Injection Pressure

• See page 1-S22.

[9] CHECK POINT OF EVERY 3000 HOURS

Checking Injection Pump

• See page 1-S21.

[10]CHECK POINT OF EVERY 1 YEAR

Replacing Air Cleaner Element

• See page G-32.

[11]CHECK POINTS OF EVERY 2 YEARS

Replacing Fuel Lines

1. Replace the hose and the clamps.
Refer to "Checking Fuel Line and Fuel Filter". (See page G-38.)

Replacing Hydraulic Hose

1. Replace hoses and hose clamps every 2 years or earlier if
checked and found that hoses are swollen, hardened or
cracked. (See page G-41.)

Replacing Radiator Hose

1. Replace hoses and clamp bands every 2 years or earlier if
checked and found that hoses are swollen, hardened or
cracked. (See page G-43.)

9Y1210294GEG0051US0

9Y1210294GEG0052US0

9Y1210294GEG0053US0

9Y1210294GEG0054US0

9Y1210294GEG0055US0

9Y1210294GEG0057US0

G-45

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

Replacing Mower Gear Box Seal

1. Replace the mower gear box oil seals (1), (2), (3).
Refer to "Mower" section.

(1) Oil Seal
(2) Oil Seal

(3) Oil Seal

9Y1210294GEG0058US0

GENERAL

Replacing Intake Air Line

• See page G-43.

G-46

9Y1210294GEG0059US0

(EU)

G23, G26, WSM

CAUTION

IMPORTANT

KiSC issued 08, 2009 A

GENERAL

Flushing Cooling System and Changing Coolant

To avoid personal injury :

• Do not remove the 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 cap
completely.

1. Stop the engine and let cool down.

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

3. After all coolant is drained, install the hose securely.

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 port.

7. Fill with clean water and anti-freeze up to the upper line of
recovery tank.

8. Install the radiator cap securely.

9. Start and operate the engine for a few minutes.

10. Stop the engine. Check coolant level and add coolant if
necessary.

3.1 L

G23

Coolant capacity

G26

3.3 U.S.qts

2.7 Imp.qts

3.3 L

3.5 U.S.qts

2.9 Imp.qts

• Do not start engine without coolant.

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

• 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.

(1) Drain Plug

(To be continued)

G-47

(EU)

G23, G26, WSM

CAUTION

IMPORTANT

KiSC issued 08, 2009 A

(Continued)

GENERAL

Q Anti-Freeze

To avoid personal injury :

• When using anti-freeze, put on some protection such as
rubber gloves (Anti-freeze contains poison.).

• If anti-freeze is ingested, induce vomiting at once and seek
medical attention.

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

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

• Anti-freeze is extremely flammable and explosive under
certain conditions. Keep fire and children away from
anti-freeze.

• 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 anti-freeze.

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

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

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

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

3. Mixing the LLC
Put the LLC in cooling water in the percentage (%) for a target
temperature. When mixing, stir it up well, and then fill into the
radiator.

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

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

Vol %

Anti-freeze

40 –24 –12 106 222

50 –37 –34 108 226

* At 1.013 x 10

Freezing Point Boiling Point*

°C °F °C °F

5

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

(To be continued)

G-48

(EU)

G23, G26, WSM

NOTE

KiSC issued 08, 2009 A

(Continued)

GENERAL

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 anti-corrosive agent. If mixed with the
cleaning agent, sludge may build up, adversely affecting the
engine parts.

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

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

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

9Y1210294GEG0060US0

[12]OTHERS

Bleeding Fuel System
Q Air must be removed :

1. When the fuel filter or lines are removed.

2. When tank is completely empty.

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

Q 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.

(1) Fuel Line
(2) Pipe Clamp

(3) Fuel Pump and Filter

9Y1210294GEG0061US0

G-49

(EU)

G23, G26, WSM

IMPORTANT

KiSC issued 08, 2009 A

GENERAL

Replacing Fuse

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

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

• Before replacing a blown fuse, determine why the fuse blew
and make any necessary repairs. Failure to follow this
procedure may result in serious damage to the machine
electrical system.
If any of the fuses should blow, replace with a new one of
the same capacity.

Q Protected Circuit

Fuse NO.

(1) 10 Parking

(2) 15 Solenoid

(3) 15 Hazard Light

(4) 10 ACC

(5) 15 Horn

(6) 15 Beacon

(7) 15 Head Light

(8) 10 Brake Light

(9)

Capacity

(A)

Slow blow fuse

(50 A)

Protected circuit

Check circuit against wrong battery
connection

(B) Fuse Box

9Y1210294GEG0062US0

G-50

(EU)

G23, G26, WSM

CAUTION

NOTE

KiSC issued 08, 2009 A

GENERAL

Checking and Replacing Blade

To avoid personal injury :

• Be sure to stop the engine and remove the key.

• Blades may be sharp. When you handle blades, wear heavy
gloves or wrap end of blade with a rag.

Q Checking

The blade cutting edges should be kept sharp at all times.

Sharpen the cutting edges, if they resemble blade (b). Replace the
blades if they appear similar to blade (c).

Q Replacing

1. Remove the mower deck from the machine.

2. Remove the two snap pins and the shaft, and then remove the
mower duct with sliding it.

• When reinstalling the mower duct, make sure that the both
stays of the mower cover are set between t he two washers.

3. Turn the mower deck over to expose the blades.

4. Wedge a block of wood between the blade and mower housing
as illustrated.

5. The blade bolts (5) have right hand threads, turn
counterclockwise to loosen.
The blade bolt (6) has left hand threads, turn clockwise to
loosen.

(1) Mower Duct
(2) Snap Pin
(3) Shaft
(4) Block
(5) Blade Bolt
(6) Blade Bolt

(a) New Blade
(b) Worn Blade
(c) Cracked Blade
A : Slide
B : Loosen

(To be continued)

G-51

(EU)

G23, G26, WSM

NOTE

NOTE

NOTE

IMPORTANT

KiSC issued 08, 2009 A

(Continued)

GENERAL

• Use the proper size box or socket wrench to tighten or
loosen the blade mounting bolt.

6. To sharpen the blades yourself, clamp the blade securely in a
vise.
Use a large mill file and file along the original bevel until sharp.

7. To check the blade for balance, place a small rod through the
centre hole. If the blade is not balanced, file the heavy side of
the blade until balance is achieved.

8. To attach blades, be sure to install pin holder and shear pin in
place, and also install the cup washer between the blade and
bolt head.

• Make sure that the cup washer is not flatte ned out or worn.
Replace the cup washer if either is damaged.

9. Before checking or replacing the blade, wipe grass and mud off
the top and inside of the mower.

• Make sure that the direction of the pin holder and the cup
washer is same as shown in the figure.

• Tighten the 2 blade bolts to 98 to 117.6 N·m (10 to 12 kgf·m,
72 to 87 lbf·ft) of torque.

(7) Bolt
(8) Cup Washer
(9) Blade
(10) 2 Share Pins

(11) Pin Holder
(12) Spindle Guard
(13) Spindle Holder

9Y1210294GEG0063US0

Replacing Head Light Bulb

1. Open the bonnet.

2. Disconnect the head light couplers.

3. Remove the head light bulbs (2).

Head light bulb Capacity 40 W / 45 W

(1) Head Light (2) Head Light Bulb

9Y1210294GEG0064US0

G-52

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

Replacing Indicator Light Bulb (Socket Bulb)

1. Remove the meter panel (1) from the machine.

2. Remove the indicator light bulbs (2).

Indicator light bulb
(Socket bulb)

(1) Meter Panel (2) Indicator Light Bulb

Capacity 2 W

9Y1210294GEG0078US0

GENERAL

G-53

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

8. SPECIAL TOOLS

[1] SPECIAL TOOLS FOR ENGINE

Special Use Puller Set
Code No.

• 07916-09032

Application

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

Piston Ring Compressor
Code No.

• 07909-32111

Application

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

GENERAL

WSM000001GEG0011US0

WSM000001GEG0012US0

Piston Ring Tool
Code No.

• 07909-32121

Application

• Use exclusively for removing or installing the piston ring with
ease.

WSM000001GEG0013US0

Diesel Engine Compression Tester
Code No.

• 07909-30208 (Assembly)

• 07909-30934 (A to F)

• 07909-31211 (E and F)

• 07909-31231 (H)

• 07909-31251 (G)

• 07909-31271 (I)

• 07909-31281 (J)

Application

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

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

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

WSM000001GEG0014US0

G-54

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

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.

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

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

9Y1210294GEG0069US0

Oil Pressure Tester
Code No.

• 07916-32032

Application

• Use to measure lubricating oil pressure.

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

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

WSM000001GEG0015US0

Valve Seat Cutter
Code No.

• 07909-33102

Application

• Use to reseat valves.

Angle

• 0.79 rad (45 °)

• 0.26 rad (15 °)

Diameter

• 28.6 mm (1.13 in.)

• 31.6 mm (1.24 in.)

• 35.0 mm (1.38 in.)

• 38.0 mm (1.50 in.)

• 41.3 mm (1.62 in.)

• 50.8 mm (2.00 in.)

WSM000001GEG0016US0

Radiator Tester
Code No.

• 07909-31551

Application

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

Remarks

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

(1) Adaptor

WSM000001GEG0017US0

G-55

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

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. (1.18 to 2.95 in. dia.)

• Connecting rod length
65 to 300 mm (2.57 to 11.81 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

2

, 0 to 7000 psi)

WSM000001GEG0021US0

Plastigage
Code No.

• 07909-30241

Application

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

Measuring range

• Green : 0.025 to 0.076 mm (0.001 to 0.003 in.)

• Red : 0.051 to 0.152 mm (0.002 to 0.006 in.)

• Blue : 0.102 to 0.229 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

G-56

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

Valve Guide Replacing Tool
Application

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

A 20 mm dia. (0.79 in. dia.)
B 11.7 to 11.9 mm dia. (0.460 to 0.468 in. dia.)
C 6.5 to 6.6 mm dia. (0.256 to 0.259 in. dia.)
D 225 mm (8.86 in.)
E 70 mm (2.76 in.)
F 45 mm (1.77 in.)
G 25 mm (0.98 in.)
H 5 mm (0.197 in.)

I 6.7 to 7.0 mm dia. (0.263 to 0.275 in. dia.)
J 20 mm dia. (0.787 in. dia.)
K 12.5 to 12.8 mm dia. (0.492 to 0.504 in. dia.)
L 8.9 to 9.1 mm (0.350 to 0.358 in.)

C1 Chamfer 1.0 mm (0.039 in.)
C2 Chamfer 2.0 mm (0.079 in.)

C0.3 Chamfer 0.3 mm (0.012 in.)

A 20 mm dia. (0.79 in. dia.)
B 9.96 to 9.98 mm dia. (0.3921 to 0.3929 in. dia.)
C 5.5 to 5.7 mm dia. (0.2165 to 0.2244 in. dia.)
D 220 mm (8.66 in.)
E 80 mm (3.15 in.)
F 40 mm (1.58 in.)
G 25 mm (0.98 in.)
H 5 mm (0.197 in.)

I 6.0 to 6.1 mm dia. (0.236 to 0.240 in. dia.)
J 18 mm dia. (0.71 in. dia.)
K 10.6 to 10.7 mm dia. (0.417 to 0.421 in. dia.)
L 6.9 to 7.1 mm (0.272 to 0.280 in.)

C1 Chamfer 1.0 mm (0.039 in.)
C2 Chamfer 2.0 mm (0.079 in.)

C0.3 Chamfer 0.3 mm (0.012 in.)

9Y1210294GEG0065US0

G-57

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

Bushing Replacing Tool
Application

• Use to press out and press fit the bushing.

[For small end bushing]

A 145 mm (5.71 in.)
B 20 mm (0.79 in.)
C 100 mm (3.94 in.)
D 19.90 to 19.95 mm dia. (0.7835 to 0.7854 in. dia.)
E 21.90 to 21.95 mm dia. (0.8622 to 0.8642 in. dia.)

F 25 mm dia. (0.98 in. dia.)
C1 Chamfer 1.0 mm (0.039 in.)
C2 Chamfer 2.0 mm (0.079 in.)

C0.3 Chamfer 0.3 mm (0.012 in.)

a 6.3 µm (250 µin.)

b 6.3 µm (250 µin.)

[For idle gear bushing]

A 150 mm (5.91 in.)

B 23 mm (0.91 in.)

C 100 mm (3.94 in.)

D 19.90 to 19.95 mm dia. (0.7835 to 0.7854 in. dia.)

E 21.90 to 21.95 mm dia. (0.8622 to 0.8642 in. dia.)

F 25 mm dia. (0.98 in. dia.)
C1 Chamfer 1.0 mm (0.039 in.)
C2 Chamfer 2.0 mm (0.079 in.)

C0.3 Chamfer 0.3 mm (0.012 in.)

a 6.3 µm (250 µin.)

b 6.3 µm (250 µin.)

Flywheel Stopper
Application

• Use to loosen and tighten the flywheel screw.

A 200 mm (7.87 in.)

B 30 mm (1.18 in.)

C 20 mm (0.79 in.)

D 15 mm (0.59 in.)

E 8 mm (0.31 in.)

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

9Y1210294GEG0066US0

9Y1210294GEG0067US0

G-58

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

Crankshaft Bearing 1 Replacing Tool
Application

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

[Press Out]

A 135 mm (5.31 in.)
B 72 mm (2.83 in.)
C 40 mm radius (1.57 in. radius)
D 10 mm (0.39 in.)
E 22 mm (0.87 in.)
F 20 mm dia. (0.79 in. dia.)
G 56.80 to 56.90 mm dia. (2.2362 to 2.2402 in.dia.)

H 51.80 to 51.90 mm dia. (2.0393 to 2.0433 in. dia.)
C1 Chamfer 1.0 mm (0.039 in.)
C2 Chamfer 2.0 mm (0.079 in.)

C0.3 Chamfer 0.3 mm (0.012 in.)

[Press Fit]

A 130 mm (5.12 in.)

B 72 mm (2.83 in.)

C 40 mm radius (1.57 in. radius)

D 9 mm (0.35 in.)

E 24 mm (0.95 in.)

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

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

H 47.38 to 47.48 mm dia. (1.865 to 1.869 in. dia.)
C1 Chamfer 1.0 mm (0.039 in.)
C2 Chamfer 2.0 mm (0.079 in.)

C0.3 Chamfer 0.3 mm (0.012 in.)

[2] SPECIAL TOOLS FOR TRACTOR

Relief Valve Pressure Tester
Code No.

• 07916-50045

Application

• This allows easy measurement of relief set pressure.

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

(07916-50361)

9Y1210294GEG0068US0

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

WSM000001GEG0027US0

G-59

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

Hydrostatic transmission Tester and HST Adaptor Set
Code No.

• 07916-52040 (Hydrostatic Transmission Tester)

• 07916-53072 (HST Adaptor Set)

Application

• This allows easy measurement of hydrostatic transmission
pressure.

(1) Hydrostatic transmission Tester

(07916-52040)
(2) Gasket (04714-00200)
(3) Connector 3(07916-51331)
(4) Vacuum Gauge (07916-51331)
(5) Pressure Gauge (Low Pressure)

(07916-51301)
(6) Pressure Gauge (High Pressure)

(in Relief Valve Set Pressure

Tester) (07916-50321)
(7) HN Tube (in Relief Valve Set

Pressure tester) (07916-50331)

(8) Valve Seat Driver (07916-60841)
(9) Connector 1 (07916-60811)
(10) Connector 2 (07916-60821)
(11) Long Connector (07916-60831)
(12) Adaptor 1 (07916-52621)
(13) Adaptor 2 with Collar

(07916-52632)

(14) Adaptor 3 with Collar

(07916-52642)

(15) HST Adaptor Set (07916-53072)

9Y1210294GEG0071US0

Brake Lever Holding Rod
Application

• To engage the brake lever when checking the HST relief
pressure.

A 500 mm (19.7 in.)
B 9.5 mm (0.37 in.)
C 22 mm (0.87 in.)
D 19 mm (0.75 in.)

9Y1210294GEG0079US0

PTO Clutch Spring Compression Tool
Application

• Use for compressing the spring into the spline boss. This tool
can be used for G23, G26, B30 series, BX50 series, BX60
series, BX24 and BX25 tractor.

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 (0.31 in.)
F 15 mm dia. (0.59 in.)
G 37 mm (1.46 in.)
H 120 mm (4.72 in.)

I M14 x 1.5
J R3 mm (0.12 in.)
K 30 mm (1.18 in.)
L 17 mm (0.67 in.)
M 38 mm (1.50 in.)

9Y1210294GEG0070US0

G-60

(EU)

G23, G26, WSM

WARNING

CAUTION

IMPORTANT

NOTE

KiSC issued 08, 2009 A

9. TYRE PRESSURE AND WHEEL

[1] TYRE PRESSURE

Checking Tyre Pressure

To avoid personal injury :

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

• Always maintain the correct tyre pressure.
Do not inflate tyre above the recommended pressure
shown in the Operator's Manual.

• Inflation pressure in front tyres rises quickly when using
compressed air.

Never operate machine with a loose rim, wheel, or axle.

• Whenever bolts are loosened, retighten to specif ied torque.

• Check all bolts frequently and keep them tightened.

Q Inflat ion Pressure

Though the inflation 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.

Front 16 × 7.50-8, Turf

Rear 24 × 12.00-12, Turf

Tyre Sizes

GENERAL

Recommended Inflation

Max. Pressure

2

120 kPa (1.2 kgf/cm

17.4 psi)

100 kPa (1.0 kgf/cm

14.5 psi)

,

2

,

[2] WHEEL

(1) Ground (A) Insufficient

(B) Normal
(C) Excessive

9Y1210294GEG0011US0

• When re-fitting or adjusting a wheel, tighten the bolts to the
following to torques then recheck after driving the machine
200 m (182 yard), after one day (8 hours) and thereafter
every 50 hours (as per maintenance chart).

• Use the tapered bolts for wheels with beveled or tapered
holes.

(1) Bolt

9Y1210294GEG0072US0

G-61

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

GENERAL

10.IMPLEMENT LIMITATIONS

The KUBOTA Machine has been thoroughly tested for proper performance with implements sold or approved by
KUBOTA. Use of implements which exceed the maximum loading weight listed below, or which are not recommended
for use with the KUBOTA Machine may result in malfunctions or failures of the machine, damage to other property
and injury to the operator or others. (Any malfunctions or failures of the machine resulting from use with improper
implements are not covered by the warranty.)

9Y1210294GEG0077US0

Maximum axle loading weight

MODEL Front axle Wf Rear axle Wr Total gross weight

G23

G26

400 kg (882 lbs) 850 kg (1874 lbs) 1200 kg (2646 lbs)

G-62

9Y1210294GEG0073US0

(EU)

1 ENGINE

KiSC issued 08, 2009 A

SERVICING

KiSC issued 08, 2009 A

CONTENTS

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

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

[1] G23........................................................................................................................................1-S4

[2] G26........................................................................................................................................1-S9

3. TIGHTENING TORQUES ..........................................................................................................1-S14

4. CHECKING, DISASSEMBLING AND SERVICING ...................................................................1-S15

[1] CHECKING AND ADJUSTING............................................................................................1-S15

(1) Engine Body ..................................................................................................................1-S15

(2) Lubricating System ........................................................................................................1-S17

(3) Cooling System .............................................................................................................1-S18

(4) Fuel System...................................................................................................................1-S20

[2] DISASSEMBLING AND ASSEMBLING ..............................................................................1-S23

(1) Separating Engine .........................................................................................................1-S23

(2) Removing Engine Outer Parts....................................................................................... 1-S30

(3) Cylinder Head and Valves .............................................................................................1-S30

(4) Gear Case and Timing Gears........................................................................................ 1-S34

(5) Piston and Connecting Rod........................................................................................... 1-S38

(6) Flywheel and Crankshaft ............................................................................................... 1-S40

[3] SERVICING.........................................................................................................................1-S42

(1) Cylinder Head and Valves .............................................................................................1-S42

(2) Timing Gears, Camshaft and Governor Gear................................................................ 1-S50

(3) Piston and Connecting Rod........................................................................................... 1-S53

(4) Crankshaft .....................................................................................................................1-S57

(5) Cylinder .........................................................................................................................1-S64

(6) Oil Pump (G23)..............................................................................................................1-S65

(7) Oil Pump (G26)..............................................................................................................1-S65

G23, G26, WSM

KiSC issued 08, 2009 A

1. TROUBLESHOOTING

ENGINE

Engine Does Not
Start

Starter Does Not Run Battery discharged Charge G-34

Engine Revolution Is
Not Smooth

Either White or Blue
Exhaust Gas Is
Observed

Symptom Probable Cause Solution

No fuel Replenish fuel G-17

Air in the fuel system Bleed G-49

Water in the fuel system Change fuel and

repair or replace fuel
system

Fuel hose clogged Clean G-38

Fuel filter clogged Change G-38

Excessively high viscosity of fuel or engine oil at
low temperature

Fuel with low cetane number Use the specified fuel G-9

Fuel leak due to loose injection pipe retaining nut Tighten retaining nut 1-S31

Incorrect injection timing Adjust 1-S20

Fuel camshaft worn Replace 1-S37

Injection nozzle clogged Clean or replace 1-S31

Injection pump malfunctioning Replace 1-S36

Seizure of crankshaft, camshaft, piston, cylinder
or bearing

Compression leak from cylinder Replace head gasket,

Improper valve timing Correct or replace

Piston ring and cylinder worn Replace 1-S39

Excessive valve clearance Adjust 1-S16

Starter malfunctioning Repair or replace 6-S25

Main switch malfunctioning Repair or replace 6-S8, 6-S9

Safety switches improperly adjusted or defective Adjust or replace 6-S11

Wiring disconnected Connect –

Ground cable disconnected Connect –

Fuel filter clogged or dirty Replace G-45

Air cleaner clogged Clean or replace G-32

Fuel leak due to loose injection pipe retaining nut Tighten retaining nut 1-S31

Injection pump malfunctioning Replace 1-S36

Incorrect nozzle injection pressure Adjust 1-S22

Injection nozzle stuck or clogged Repair or replace 1-S31

Governor malfunctioning Repair 1-S37

Excessive engine oil Reduce to the

Piston ring and cylinder worn or stuck Repair or replace 1-S39

Incorrect injection timing Adjust 1-S20

Deficient compression Check 1-S15

1-S1

Use specified fuel or
engine oil

Repair or replace 1-S37

tighten cylinder head
screw, glow plug and
nozzle holder

timing gear

specified level

Reference

Page

–

G-9

1-S32

1-S37

G-16

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

ENGINE

Symptom Probable Cause Solution

Either Black or Dark
Gray Exhaust Gas Is
Observed

Overload Reduce the load –

Low grade fuel used Use specified fuel G-9

Reference

Page

Fuel filter clogged Replace G-38

Air cleaner clogged Clean or replace G-32

Deficient nozzle injection Repair or replace

1-S31

nozzle

Deficient Output Incorrect injection timing Adjust 1-S20

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

Injection pump malfunctioning Repair or replace 1-S36

Deficient nozzle injection Repair or replace

1-S31

nozzle

Compression leak Replace head gasket,

1-S32
tighten cylinder head
screw, glow plug and
nozzle holder

Air cleaner dirty or clogged Clean or replace G-32

Excessive Lubricant
Oil Consumption

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

direction

1-S39

Oil ring worn or stuck Replace 1-S39

Piston ring groove worn Replace piston 1-S39

Valve stem and valve guide worn Replace 1-S44

Oil leaking due to defective seals or packing Replace –

Fuel Mixed into
Lubricant Oil

Injection pump's plunger worn Repair or replace 1-S36

Deficient nozzle injection Repair or replace

1-S31
nozzle

Injection pump broken Replace 1-S36

Water Mixed into
Lubricant Oil

Head gasket defective Replace 1-S32

Cylinder block or cylinder head flawed Replace 1-S32

Low Oil Pressure Engine oil insufficient Replenish G-16

Oil strainer clogged Clean 1-S34

Oil filter clogged Replace G-20

Relief valve stuck with dirt Clean 1-S17

Relief valve spring weaken or broken Replace 1-S17

Excessive oil clearance of crankshaft bearing Replace 1-S38

Excessive oil clearance of crankpin bearing Replace 1-S38

Excessive oil clearance of rocker arm Replace 1-S32

Oil passage clogged Clean –

Different type of oil Use the specified type

G-9

of oil

Oil pump defective Repair or replace 1-S65

High Oil Pressure Different type of oil Use the specified type

G-9

of oil

Relief valve defective Replace 1-S17

1-S2

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

ENGINE

Symptom Probable Cause Solution

Reference

Page

Engine Overheated Engine oil insufficient Replenish G-16

Fan belt broken or elongated Replace or adjust 1-S18

Coolant insufficient Replenish G-19

Radiator net and radiator fin clogged with dust Clean –

Inside of radiator corroded Clean or replace –

Coolant flow route corroded Clean or replace –

Radiator cap defective Replace 1-S18

Overload running Reduce the load –

Head gasket defective Replace 1-S32

Incorrect injection timing Adjust 1-S20

Unsuitable fuel used Use specified fuel G-9

Battery Quickly
Discharged

Battery electrolyte insufficient Replenish distilled

water and charge

Fan belt slips Adjust belt tension or

G-34

1-S18

replace

Wiring disconnected Connect –

Alternator defective Replace 6-S26

Battery defective Replace 1-S24

9Y1210294ENS0001US0

1-S3

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

2. SERVICING SPECIFICATIONS

[1] G23

ENGINE BODY

Item Factory Specification Allowable Limit

Valve Clearance (Cold) 0.145 to 0.185 mm

0.00571 to 0.00728 in.

Compression Pressure

3.53 to 4.02 MPa

36.0 to 41.0 kgf/cm
512 to 583 psi

ENGINE

–

2

2.55 MPa

26.0 kgf/cm
370 psi

2

• Differential among Cylinders

Top Clearance 0.55 to 0.70 mm

0.022 to 0.027 in.

Cylinder Head Surface Flatness – 0.05 mm

Valve Recessing Intake and Exhaust −0.10 to 0.10 mm

−0.0039 to 0.0039 in.

Valve Stem to Valve Guide

• Valve Stem

• Valve Guide

Valve Face Angle (Intake) 0.79 rad

Valve Seat Angle (Intake and

Valve Spring Free Length 31.3 to 31.8 mm

Rocker Arm Shaft to Rocker Arm

Clearance

O.D.

I.D.

Angle (Exhaust) 0.79 rad

exhaust)

Width 2.12 mm

Tilt – 1.2 mm

Setting Load 65 N / 27.0 mm

Clearance

0.030 to 0.057 mm

0.0012 to 0.0022 in.

5.968 to 5.980 mm

0.2350 to 0.2354 in.

6.010 to 6.025 mm

0.2367 to 0.2372 in.

1.24 to 1.25 in.

6.6 kgf / 27.0 mm
15 lbf / 1.06 in.

0.016 to 0.045 mm

0.00063 to 0.0017 in.

–

45 °

45 °

0.79 rad
45 °

0.0835 in.

10 % or less

–

0.002 in.

0.30 mm

0.012 in.

0.10 mm

0.0039 in.

–

–

–

–

–

–

28.4 mm

1.12 in.

0.047 in.

55 N / 27.0 mm

5.6 kgf / 27.0 mm
12 lbf / 1.06 in.

0.15 mm

0.0059 in.

• Rocker Arm Shaft

• Rocker Arm

Push Rod Alignment – 0.25 mm

O.D.

I.D.

1-S4

10.473 to 10.484 mm

0.41233 to 0.41275 in.

10.500 to 10.518 mm

0.41339 to 0.41409 in.

–

–

0.0098 in.

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

Tappet to Tappet Guide

ENGINE

Item Factory Specification Allowable Limit

Clearance

0.016 to 0.052 mm

0.00063 to 0.0020 in.

0.10 mm

0.0039 in.

• Tappet

• Tappet Guide

Timing Gear

• Crank Gear to Idle Gear

• Idle Gear 1 to Cam Gear

• Idle Gear 1 to Injection Pump Gear

• Crank Gear to Oil Pump Drive Gear

Idle Gear Shaft to Gear Bushing

• Idle Gear 1

• Idle Gear Bushing

O.D.

I.D.

Backlash

Backlash

Backlash

Backlash

Clearance

I.D.

17.966 to 17.984 mm

0.70733 to 0.70803 in.

18.000 to 18.018 mm

0.70867 to 0.70937 in.

0.0430 to 0.124 mm

0.00170 to 0.00488 in.

0.0470 to 0.123 mm

0.00185 to 0.00484 in.

0.0460 to 0.124 mm

0.00182 to 0.00488 in.

0.0410 to 0.123 mm

0.00162 to 0.00484 in.

0.020 to 0.084 mm

0.00079 to 0.0033 in.

20.000 to 20.051 mm

0.78741 to 0.78940 in.

–

–

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.10 mm

0.0039 in.

–

• Idle Gear Shaft 1

O.D.

19.967 to 19.980 mm

0.78611 to 0.78661 in.

Idle Gear

• Idle Gear 1 Side Clearance 0.20 to 0.51 mm

0.0079 to 0.020 in.

Camshaft Side Clearance

0.15 to 0.31 mm

0.0059 to 0.012 in.

Alignment

Cam Height Intake

–

26.88 mm

1.058 in.

Exhaust

26.88 mm

1.058 in.

Camshaft Journal to Cylinder Block Bore

Oil Clearance

0.050 to 0.091 mm

0.0020 to 0.0035 in.

• Camshaft Journal

O.D.

32.934 to 32.950 mm

1.2967 to 1.2972 in.

• Cylinder Block Bore

I.D.

33.000 to 33.025 mm

1.2993 to 1.3001 in.

Piston Pin Bore I.D. 20.000 to 20.013 mm

0.78741 to 0.78791 in.

–

0.80 mm

0.031 in.

0.50 mm

0.020 in.

0.01 mm

0.0004 in.

26.83 mm

1.056 in.

26.83 mm

1.056 in.

0.15 mm

0.0059 in.

–

–

20.05 mm

0.7894 in.

1-S5

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

Piston Pin to Small End Bushing

ENGINE

Item Factory Specification Allowable Limit

Clearance

0.015 to 0.075 mm

0.0059 to 0.0029 in.

0.15 mm

0.0059 in.

•Piston Pin

O.D.

20.002 to 20.011 mm

–

0.78748 to 0.78783 in.

• Small End Bushing

I.D.

20.025 to 20.040 mm

–

0.78839 to 0.78897 in.

Top Ring Piston Ring Gap 0.20 to 0.35 mm

0.0079 to 0.013 in.

Second Ring Piston Ring Gap 0.35 to 0.50 mm

0.014 to 0.019 in.

Oil Ring Piston Ring Gap 0.20 to 0.35 mm

0.0079 to 0.013 in.

1.25 mm

0.0492 in.

1.25 mm

0.0492 in.

1.25 mm

0.0492 in.

Piston Ring to Piston Ring Groove

• Second Ring

• Oil Ring

Clearance

Clearance

0.0900 to 0.0120 mm

0.00355 to 0.00472 in.

0.040 to 0.080 mm

0.0016 to 0.0031 in.

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

Connecting Rod Alignment – 0.05 mm

0.002 in.

Crankshaft Alignment – 0.02 mm

0.0008 in.

Crankshaft to Crankshaft Bearing 1

Oil Clearance

0.0340 to 0.106 mm

0.00134 to 0.00417 in.

0.20 mm

0.0079 in.

• Crankshaft Journal

• Crankshaft Bearing 1

Crankshaft to Crankshaft Bearing 2

• Crankshaft Journal

• Crankshaft Bearing 2

Crankshaft to Crankshaft Bearing 3

• Crankshaft Journal

• Crankshaft Bearing 3

O.D.

I.D.

Oil Clearance

O.D.

I.D.

Oil Clearance

O.D.

I.D.

43.934 to 43.950 mm

1.7297 to 1.7303 in.

43.984 to 44.040 mm

1.7315 to 1.7320 in.

0.028 to 0.059 mm

0.0011 to 0.0023 in.

43.934 to 43.950 mm

1.7297 to 1.7303 in.

43.978 to 43.993 mm

1.7315 to 1.7320 in.

0.028 to 0.059 mm

0.0011 to 0.0023 in.

43.934 to 43.950 mm

1.7297 to 1.7303 in.

43.978 to 43.993 mm

1.7315 to 1.7320 in.

–

–

0.20 mm

0.0079 in.

–

–

0.20 mm

0.0079 in.

–

–

1-S6

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

Crankpin to Crankpin Bearing

ENGINE

Item Factory Specification Allowable Limit

Oil Clearance

0.020 to 0.051 mm

0.00079 to 0.0020 in.

0.15 mm

0.0059 in.

• Crankpin

O.D.

33.959 to 33.975 mm

1.3370 to 1.3375 in.

• Crankpin Bearing

I.D.

33.995 to 34.010 mm

1.3384 to 1.3389 in.

Crankshaft Side Clearance 0.15 to 0.31 mm

0.0059 to 0.012 in.

Cylinder Liner I.D. 72.000 to 72.019 mm

2.8347 to 2.8353 in.

Cylinder (Oversized) 72.250 to 72.269 mm

2.8445 to 2.8452 in.

LUBRICA TING SYSTEM

Item Factory Specification Allowable Limit

Engine Oil Pressure At Idle Speed More than

49 kPa

0.50 kgf/cm

2

7.1 psi

At Rated Speed 197 to 441 kPa

2.00 to 4.50 kgf/cm

28.6 to 63.9 psi

Inner Rotor to Outer Rotor Clearance 0.030 to 0.14 mm

0.0012 to 0.0055 in.

Outer Rotor to Pump Body Clearance 0.070 to 0.15 mm

0.0028 to 0.0059 in.

Inner Rotor to Cover Clearance 0.0750 to 0.135 mm

0.00296 to 0.00531 in.

–

–

0.50 mm

0.020 in.

72.150 mm

2.8406 in.

72.400 mm

2.8504 in.

–

2

147 kPa

1.50 kgf/cm

2

21.3 psi

–

–

–

1-S7

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

COOLING SYSTEM

Item Factory Specification Allowable Limit

Fan Belt Tension 7.0 to 9.0 mm / 98 N

0.28 to 0.35 in. / 98 N
(10 kgf, 22lbf)

Thermostat

• Valve Opening Temperature

At Beginning

69.5 to 72.5 °C

157.1 to 162.5 °F

ENGINE

–

–

• Valve Opening Temperature

Radiator Cap Pressure Falling

Opened
Completely

Time

85 °C

185 °F

10 seconds or more

88 → 59 kPa

0.90 → 0.60 kgf/cm

–

–

2

13 → 8.6 psi

Radiator Water Leakage

Tes t Pr es su re

No leak at specified

pressure

–

FUEL SYSTEM

Item Factory Specification Allowable Limit

Injection Pump Injection Timing

(3200 min

-1

(rpm))

0.3360 to 0.3622 rad
(19.25 to 20.75 °)

–

before T.D.C.

Pump Element Fuel Tightness – 13.73 MPa

140.0 kgf/cm
1991 psi

Delivery Valve Fuel Tightness 10 seconds

13.73 → 12.75 MPa

140.0 → 130.0 kgf/cm
1991 → 1849 psi

2

5 seconds

13.73 → 12.75 MPa

140.0 → 130.0
kgf/cm

1991 → 1849 psi

Injection Nozzle Injection Pressure 13.73 to 14.70 MPa

140.0 to 150.0 kgf/cm

2

–

1991 to 2132 psi

Injection Nozzle Valve Seat Valve Seat

Tightness

When the pressure is

12.75 MPa

(130.0 kgf/cm

2

, 1849

–

psi), the valve seat must

be fuel tightness.

2

2

1-S8

9Y1210294ENS0002US0

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

[2] G26

ENGINE BODY

Item Factory Specification Allowable Limit

Valve Clearance (Cold) 0.145 to 0.185 mm

0.00571 to 0.00728 in.

Compression Pressure

3.73 to 4.11 MPa

38.0 to 42.0 kgf/cm
541 to 596 psi

ENGINE

–

2.26 MPa

2

23.0 kgf/cm

2

328 psi

• Differential among Cylinders

Top Clearance 0.55 to 0.75 mm

–

10 % or less

–

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.

Valve Stem to Valve Guide

Clearance

0.035 to 0.065 mm

0.0014 to 0.0025 in.

• Valve Stem

O.D.

6.960 to 6.975 mm

0.40 mm

0.016 in.

0.10 mm

0.0039 in.

–

0.2741 to 0.2746 in.

• Valve Guide

I.D.

7.010 to 7.025 mm

–

0.2760 to 0.2765 in.

Valve Face Angle (Intake) 1.0 rad

–

60 °

Angle (Exhaust) 0.79 rad

–

45 °

Valve Seat Angle (Intake) 1.0 rad

–

60 °

Angle (Exhaust) 0.79 rad

–

45 °

Width 2.12 mm

–

0.0835 in.

Valve Spring Free Length 37.0 to 37.5 mm

1.46 to 1.47 in.

36.5 mm

1.44 in.

Tilt – 1.0 mm

0.039 in.

Rocker Arm Shaft to Rocker Arm

Setting Load 117.4 N / 31.0 mm

11.97 kgf / 31.0 mm

26.39 lbf / 1.22 in.

Clearance

0.016 to 0.045 mm

0.00063 to 0.0017 in.

100.0 N / 31.0 mm

10.20 kgf / 31.0 mm

22.48 lbf / 1.22 in.

0.10 mm

0.0039 in.

• Rocker Arm Shaft

• Rocker Arm

Push Rod Alignment – 0.25 mm

O.D.

I.D.

1-S9

11.973 to 19.984 mm

0.47138 to 0.47181 in.

12.000 to 12.018 mm

0.47244 to 0.47314 in.

–

–

0.0098 in.

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

Tappet to Tappet Guide

ENGINE

Item Factory Specification Allowable Limit

Clearance

0.020 to 0.062 mm

0.00079 to 0.0024 in.

0.07 mm

0.003 in.

• Tappet

• Tappet Guide

Timing Gear

• Crank Gear to Idle Gear 1

• Idle Gear 1 to Cam Gear

• Idle Gear 1 to Injection Pump Gear

Governor Gear

• Governor Gear to Injection Pump Gear
(Fuel Cam Gear)

Idle Gear Shaft to Gear Bushing

• Idle Gear 1

• Idle Gear Bushing

O.D.

19.959 to 19.980 mm

0.78579 to 0.78661 in.

I.D.

20.000 to 20.021mm

0.78740 to 0.78822 in.

Backlash

0.0320 to 0.115 mm

0.00126 to 0.00452 in.

Backlash

0.0360 to 0.114 mm

0.00142 to 0.00448 in.

Backlash

0.0340 to 0.116 mm

0.00134 to 0.00456 in.

Backlash 0.0300 to 0.117 mm

0.00119 to 0.00460 in.

Clearance

0.020 to 0.054 mm

0.00079 to 0.0021 in.

I.D.

26.000 to 26.021 mm

1.0237 to 1.0244 in.

–

–

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.15 mm

0.0059 in.

0.10 mm

0.0039 in.

–

• Idle Gear Shaft 1

O.D.

25.967 to 25.980 mm

1.0224 to 1.0228 in.

Idle Gear

• Idle Gear 1 Side Clearance 0.20 to 0.51 mm

0.0079 to 0.020 in.

Camshaft Side Clearance

0.070 to 0.22 mm

0.0028 to 0.0086 in.

Alignment

Cam Height Intake

–

28.80 mm

1.134 in.

Exhaust

29.00 mm

1.142 in.

Camshaft Journal to Cylinder Block Bore

Oil Clearance

0.050 to 0.091 mm

0.0020 to 0.0035 in.

• Camshaft Journal

O.D.

35.934 to 35.950 mm

1.4148 to 1.4153 in.

• Cylinder Block Bore

I.D.

36.000 to 36.025 mm

1.4174 to 1.4183 in.

Piston Pin Bore I.D. 22.000 to 22.013 mm

0.86615 to 0.86665 in.

–

0.80 mm

0.031 in.

0.30 mm

0.012 in.

0.01 mm

0.0004 in.

28.75 mm

1.132 in.

28.95 mm

1.140 in.

0.15 mm

0.0059 in.

–

–

22.03 mm

0.8673 in.

1-S10

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

Piston Pin to Small End Bushing

ENGINE

Item Factory Specification Allowable Limit

Clearance

0.014 to 0.038 mm

0.00056 to 0.0014 in.

0.15 mm

0.0059 in.

•Piston Pin

O.D.

22.002 to 22.011 mm

–

0.86622 to 0.86657 in.

• Small End Bushing

I.D.

22.025 to 22.040 mm

–

0.86713 to 0.86771 in.

Top Ring Piston Ring Gap 0.30 to 0.45 mm

0.012 to 0.017 in.

Second Ring Piston Ring Gap 0.30 to 0.45 mm

0.012 to 0.017 in.

Oil Ring Piston Ring Gap 0.25 to 0.40 mm

0.0098 to 0.015 in.

1.25 mm

0.0492 in.

1.25 mm

0.0492 in.

1.25 mm

0.0492 in.

Piston Ring to Piston Ring Groove

• Second Ring

• Oil Ring

Clearance

Clearance

0.0850 to 0.112 mm

0.00335 to 0.00440 in.

0.020 to 0.055 mm

0.00079 to 0.0021 in.

0.2 mm

0.008 in.

0.15 mm

0.0059 in.

Connecting Rod Alignment – 0.05 mm

0.002 in.

Crankshaft Alignment – 0.02 mm

0.0008 in.

Crankshaft to Crankshaft Bearing 1

Oil Clearance

0.0340 to 0.114 mm

0.00134 to 0.00448 in.

0.20 mm

0.0079 in.

• Crankshaft

• Crankshaft Bearing 1

Crankshaft to Crankshaft Bearing 2

• Crankshaft

• Crankshaft Bearing 2

Crankshaft to Crankshaft Bearing 3

• Crankshaft

• Crankshaft Bearing 3

O.D.

I.D.

Oil Clearance

O.D.

I.D.

Oil Clearance

O.D.

I.D.

47.934 to 47.950 mm

1.8872 to 1.8877 in.

47.984 to 48.048 mm

1.8892 to 1.8916 in.

0.034 to 0.095 mm

0.0014 to 0.0037 in.

47.934 to 47.950 mm

1.8872 to 1.8877 in.

47.978 to 48.029 mm

1.8892 to 1.8908 in.

0.034 to 0.098 mm

0.0014 to 0.0038 in.

51.921 to 51.940 mm

2.0442 to 2.0448 in.

51.974 to 52.019 mm

2.0463 to 2.0479 in.

–

–

0.20 mm

0.0079 in.

–

–

0.20 mm

0.0079 in.

–

–

1-S11

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

Crankpin to Crankpin Bearing

ENGINE

Item Factory Specification Allowable Limit

Oil Clearance

0.029 to 0.091 mm

0.0012 to 0.0035 in.

0.20 mm

0.0079 in.

• Crankpin

O.D.

39.959 to 39.975 mm

1.5732 to 1.5738 in.

• Crankpin Bearing

I.D.

40.040 to 40.050 mm

1.5764 to 1.5767 in.

Crankshaft Side Clearance 0.15 to 0.31 mm

0.0059 to 0.012 in.

Cylinder Liner I.D. 76.000 to 76.019 mm

2.9922 to 2.9928 in.

Cylinder (Oversized) 76.500 to 76.519 mm

3.0119 to 3.0125 in.

LUBRICATING SYSTEM

Item Factory Specification Allowable Limit

Engine Oil Pressure At Idle Speed More than

49 kPa

0.50 kgf/cm

2

7.1 psi

At Rated Speed 197 to 441 kPa

2.00 to 4.50 kgf/cm

28.6 to 63.9 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.

–

–

0.50 mm

0.020 in.

76.15 mm

2.998 in.

76.65 mm

3.018 in.

–

2

147 kPa

1.50 kgf/cm

2

21.3 psi

–

–

–

1-S12

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

COOLING SYSTEM

Item Factory Specification Allowable Limit

Fan Belt Tension 7.0 to 9.0 mm / 98 N

0.28 to 0.35 in. / 98 N
(10 kgf, 22lbf)

Thermostat

• Valve Opening Temperature

At Beginning

69.5 to 72.5 °C

157.1 to 162.5 °F

ENGINE

–

–

• Valve Opening Temperature

Radiator Cap Pressure Falling

Opened
Completely

Time

85 °C

185 °F

10 seconds or more

88 → 59 kPa

0.90 → 0.60 kgf/cm

–

–

2

,

13 → 8.6 psi

Radiator Water Leakage

Test Pressure

No leak at specified

pressure

–

FUEL SYSTEM

Item Factory Specification Allowable Limit

Injection Pump Injection Timing

(3200 min

-1

(rpm))

0.3360 to 0.3622 rad
(19.25 to 20.75 °)

–

before T.D.C.

Pump Element Fuel Tightness – 13.73 MPa

140.0 kgf/cm
1991 psi

Delivery Valve Fuel Tightness 10 seconds

13.73 → 12.75 MPa

140.0 → 130.0 kgf/cm
1991 → 1849 psi

2

5 seconds

13.73 → 12.75 MPa

140.0 → 130.0
kgf/cm

1991 → 1849 psi

Injection Nozzle Injection Pressure 13.73 to 14.70 MPa

140.0 to 150.0 kgf/cm

2

–

1991 to 2132 psi

Injection Nozzle Valve Seat Valve Seat

Tightness

When the pressure is

12.75 MPa

(130.0 kgf/cm

2

, 1849

–

psi), the valve seat must

be fuel tightness.

2

2

1-S13

9Y1210294ENS0003US0

(EU)

G23, G26, WSM

NOTE

KiSC issued 08, 2009 A

ENGINE

3. TIGHTENING TORQUES

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

(For general use screws, bolts and nuts : See page G-12)

[Tractor Section]

Item N·m kgf·m lbf·ft

Front coupling mounting bolt 24 to 27 2.4 to 2.8 18 to 20

Engine mounting nut 24 to 27 2.4 to 2.8 18 to 20

Cushion mounting nut 24 to 27 2.4 to 2.8 18 to 20

Engine support mounting screw 52.8 to 55.9 5.4 to 5.7 38.9 to 41.2

Drive pulley mounting bolt 52.8 to 55.9 5.4 to 5.7 38.9 to 41.2

[Engine Section]

Item

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

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

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

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

*Flywheel screw M10 × 1.25 54 to 58 5.5 to 6.0 40 to 43

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

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

*Idle gear shaft mounting screw M6 × 1.0 9.81 to 11.2 1.00 to 1.15 7.24 to 8.31

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

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

Glow plug M8 × 1.0 7.9 to 14 0.80 to 1.5 5.8 to 10

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

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

Oil pressure switch PT 1/8 15 to 19 1.5 to 2.0 11 to 14

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

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

Drain plug with copper gasket M12 × 1.25 33 to 37 3.3 to 3.8 24 to 27

Drain plug with rubber coated gasket M22 × 1.5 45 to 53 4.5 to 5.5 33 to 39

Oil filter joint – 40 to 49 4.0 to 5.0 29 to 36

Dimension ×

Pitch

N·m kgf·m lbf·ft

• 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.

1-S14

9Y1210294ENS0004US0

(EU)

G23, G26, WSM

NOTE

KiSC issued 08, 2009 A

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

(1) Engine Body

Compression Pressure

1. Run the engine until it is warmed up.

2. Stop the engine.

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

4. Set a compression tester with the adaptor to the glow plug hole
(or nozzle hole).

Nozzle hole : Adaptor H (07909-31231)
Glow plug hole : Adaptor L (07909-31301)

5. Disconnect the connector of engine stop solenoid and keep the
engine stop position (non-injection). Then, run 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.

ENGINE

• Check the compression pressure with the specified valve
clearance.

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

• Variances in cylinder compression values should b e under
10 %.

[G23]

Compression pressure

Factory specification

Allowable limit

3.53 to 4.02 MPa

36.0 to 41.0 kgf/cm
512 to 583 psi

2.55 MPa

26.0 kgf/cm
370 psi

2

2

[G26]

Compression pressure

Factory specification

Allowable limit

3.73 to 4.11 MPa

38.0 to 42.0 kgf/cm
541 to 596 psi

2.26 MPa

23.0 kgf/cm
328 psi

9Y1210294ENS0005US0

2

2

1-S15

(EU)

G23, G26, WSM

IMPORTANT

NOTE

KiSC issued 08, 2009 A

ENGINE

Checking Valve Clearance

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

1. Remove the cylinder head cover and the glow plugs.

2. Align the "1TC" mark (1) on the flywheel and alignment mark (2)

on the rear end plate 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.

5. Then turn the flywheel 6.28 rad (360 °) and align the "1TC"

mark (1) on the flywheel and alignment mark (2) on the rear end
plate so that the No.1 piston comes to the overlap position.

6. Check the following valve clearance "," using a feeler gauge.

7. if the clearance is not with in the factory specifications, adjust
with the adjusting screw.

Adjustable cylinder location of

No. 1 ++

No. 2 ,+

No. 3 +,

Valve clearance marked with "+" can be adjusted.

Intake and exhaust valve
clearance (cold)

piston

Factory specification

Number of cylinder valve arrangement

Intake valve Exhaust valve

0.145 to 0.185 mm

0.00571 to 0.0728 in.

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

• After adjusting the valve clearance, secure the adjusting
screw with the lock nut.

(1) 1TC Mark
(2) Alignment Mark

A : Gear Case Side

9Y1210294ENS0006US0

1-S16

(EU)

G23, G26, WSM

KiSC issued 08, 2009 A

(2) Lubricating System

ENGINE

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 defective

• Oil strainer clogged

• Oil filter cartridge clogged

• Oil gallery clogged

• Excessive oil clearance

• Foreign matter in the relief valve

More than
49 kPa

0.50 kgf/cm

7.1 psi

197 to 441 kPa

2.00 to 4.50 kgf/cm

28.5 to 64.0 psi

147 kPa

1.50 kgf/cm

21.3 psi

2

2

2

Engine oil pressure

Factory
specifica­tion

Allowable
limit

At idle
speed

At rated
speed

At rated
speed

(When reassembling)

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

Tightening torque Oil pressure switch

15 to 19 N·m

1.5 to 2.0 kgf·m
11 to 14 lbf·ft

9Y1210294ENS0007US0

Relief Valve

1. Remove the oil filter base.

2. Check the relief valve for dirt, and the seat and ball for damage.

3. If damaged, replace.

4. Check the free length of spring.

5. If less than the allowable limit, replace.

32 mm

1.26 in.

28 mm

1.10 in.

40 to 49 N·m

4.0 to 5.0 kgf·m
29 to 36 lbf·ft

9Y1210294ENS0008US0

Relief valve spring

Tightening torque Joint

(1) Relief Valve
(2) Joint

Factory specification

Allowable limit

(3) Spring

1-S17

(EU)

G23, G26, WSM

CAUTION

KiSC issued 08, 2009 A

(3) Cooling System

ENGINE

Fan Belt Tension

1. Measure the deflection (A), depressing the belt halfway

between the fan drive pulley and alternator pulley at specified
force 98 N (10 kgf, 22 lbf).

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

Deflection (A) Factory specification

(A) Deflection

7.0 to 9.0 mm

0.28 to 0.35 in.

9Y1210272ENS0017US0

Fan Belt Damage and Wear

1. Check the fan belt for damage.

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

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

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

(A) Good (B) Bad

9Y1210272ENS0018US0

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

9Y1210294ENS0011US0

Radiator Cap Air Leakage

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

2. Apply the specified pressure 88 kPa (0.90 kgf/cm

2

, 13 psi), and

measure the time for the pressure to fall to 59 kPa (0.60 kgf/cm

8.6 psi).

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

More than 10 seconds for
pressure fall

Pressure falling time Factory specification

(1) Radiator Tester (2) Adaptor

1-S18

88 → 59 kPa
(0.90 → 0.60 kgf/cm
13 → 8.6 psi)

9Y1210294ENS0009US0

2

,

(EU)

2

,