This service manual provides instructions for maintaining and repairing excavators models JS210 and JS230. It contains sections covering the machine components, safety procedures, and a description of the machine. The manual instructs technicians on safety during maintenance, operating procedures, and working on job sites. It also includes diagrams and specifications for repairs and replacements of parts.

1. SERVICE MANUAL
EXCAVATOR
JS210, JS230
EN - 9813/8000 - ISSUE 1 - 10/2016
This manual contains original instructions, verified by
the manufacturer (or their authorized representative).
Copyright 6-10-27 © JCB SERVICE
All rights reserved. No part of this publication may
be reproduced, stored in a retrieval system, or
transmitted in any form or by any other means,
electronic, mechanical, photocopying or otherwise,
without prior permission from JCB SERVICE.
www.jcb.com
Foreword
The Operator's Manual
You and others can be killed or seriously injured
if you operate or maintain the machine without
first studying the Operator's Manual. You must
understand and follow the instructions in the
Operator's Manual. If you do not understand
anything, ask your employer or JCB dealer to
explain it.
Do not operate the machine without an Operator's
Manual, or if there is anything on the machine you
do not understand.
Treat the Operator's Manual as part of the machine.
Keep it clean and in good condition. Replace the
Operator's Manual immediately if it is lost, damaged
or becomes unreadable.
Contents
01 - Machine
03 - Attachments, Couplings and Load
Handling
06 - Body and Framework
09 - Operator Station
12 - Heating, Ventilating and Air-
Conditioning (HVAC)
15 - Engine
18 - Fuel and Exhaust System
21 - Cooling System
27 - Driveline
30 - Hydraulic System
33 - Electrical System
72 - Fasteners and Fixings
75 - Consumable Products
78 - After Sales

2. 9813/8000-1
2016-10-18
01 - Machine
Contents Page No.
Acronyms Glossary .................................................................................................................................... 01-2
01-03 Safety
01-03-03 Safety - Yours and Others ............................................................................................... 01-3
01-03-06 Safety Warnings ............................................................................................................... 01-4
01-03-09 General Safety ................................................................................................................. 01-5
01-03-12 Maintenance Safety ......................................................................................................... 01-6
01-03-18 Operating Safety .............................................................................................................. 01-8
01-03-21 Worksite Safety .............................................................................................................. 01-10
01-03-24 Risk Assessment ............................................................................................................ 01-11
01-03-27 Maintenance Positions ................................................................................................... 01-12
01-06 About this Manual
01-06-06 Using the Manual ........................................................................................................... 01-15
01-09 Description
01-09-12 Main Component Locations ........................................................................................... 01-19
01-09-15 Service Point Locations ................................................................................................. 01-20

3. 9813/8000-1
2016-10-18
Acronyms Glossary
ARV Auxiliary Relief Valve
FEAD Front End Accessory Drive
MRV Main Relief Valve
PIL Parts Identification List
PPE Personal Protective Equipment

4. 01 - Machine
03 - Safety
01 - 1 9813/8000-1 01 - 1
03 - Safety
Contents Page No.
01-03-03 Safety - Yours and Others ............................................................................................... 01-3
01-03-06 Safety Warnings ............................................................................................................... 01-4
01-03-09 General Safety ................................................................................................................. 01-5
01-03-12 Maintenance Safety ......................................................................................................... 01-6
01-03-18 Operating Safety .............................................................................................................. 01-8
01-03-21 Worksite Safety .............................................................................................................. 01-10
01-03-24 Risk Assessment ............................................................................................................ 01-11
01-03-27 Maintenance Positions ................................................................................................... 01-12

5. 01 - Machine
03 - Safety
03 - Safety - Yours and Others
01 - 3 9813/8000-1 01 - 3
03 - Safety - Yours and Others
Introduction
All machinery can be hazardous. When a machine
is correctly operated and maintained, it is a safe
machine to work with. When it is carelessly operated
or poorly maintained it can become a danger to you
(the operator) and others.
In this manual and on the machine you will find
warning messages, read and understand them. They
inform you of potential hazards and how to avoid
them. If you do not fully understand the warning
messages, ask your employer or JCB dealer to
explain them.
Safety is not just a matter of responding to the
warnings. All the time you are working on or with the
machine you must be thinking of what hazards there
might be and how to avoid them.
Do not work with the machine until you are sure that
you can control it.
Do not start any work until you are sure that you and
those around you will be safe.
If you are not sure of anything, about the machine or
the work, ask someone who knows. Do not assume
anything.
Remember:
• Be careful
• Be alert
• Be safe.

6. 01 - Machine
03 - Safety
06 - Safety Warnings
01 - 4 9813/8000-1 01 - 4
06 - Safety Warnings
Introduction
In this manual and on the machine, there are safety
notices. Each notice starts with a signal word. The
signal word meanings are given below.
The signal word 'DANGER' indicates a hazardous
situation which, if not avoided, will result in death or
serious injury.
The signal word 'WARNING' indicates a hazardous
situation which, if not avoided, could result in death
or serious injury.
The signal word 'CAUTION' indicates a hazardous
situation which, if not avoided, could result in minor
or moderate injury.
The signal word 'Notice' indicates a hazardous
situation which, if not avoided, could result in
machine damage.
The safety alert system (shown) also helps to identify
important safety messages in this manual and on the
machine. When you see this symbol, be alert, your
safety is involved, carefully read the message that
follows, and inform other operators.
Figure 1. The safety alert system

7. 01 - Machine
03 - Safety
09 - General Safety
01 - 5 9813/8000-1 01 - 5
09 - General Safety
Introduction
Training
To operate the machine safely you must know the
machine and have the skill to use it. You must abide
by all relevant laws, health and safety regulations
that apply to the country you are operating in. The
operator's manual instructs you on the machine, its
controls and its safe operation; it is not a training
manual. If you are a new operator, get yourself
trained in the skills of using a machine before trying
to work with it. If you don't, you will not do your job
well, and you will be a danger to yourself and others.
In some markets and for work on certain jobsites you
may be required to have been trained and assessed
in accordance with an operator competence scheme.
Make sure that you and your machine complies
relevant local laws and jobsite requirements - it is
your responsibility.
Care and Alertness
All the time you are working with or on the machine,
take care and stay alert. Always be careful. Always
be alert for hazards.
Clothing
You can be injured if you do not wear the correct
clothing. Loose clothing can get caught in the
machinery. Keep cuffs fastened. Do not wear a
necktie or scarf. Keep long hair restrained. Remove
rings, watches and personal jewellery.
Alcohol and Drugs
It is extremely dangerous to operate machinery when
under the influence of alcohol or drugs. Do not
consume alcoholic drinks or take drugs before or
while operating the machine or attachments. Be
aware of medicines which can cause drowsiness.
Feeling Unwell
Do not attempt to operate the machine if you are
feeling unwell. By doing so you could be a danger to
yourself and those you work with.
Mobile Phones
Switch off your mobile phone before entering an
area with a potentially explosive atmosphere. Sparks
in such an area could cause an explosion or fire
resulting in death or serious injury.
Switch off and do not use your mobile phone when
refuelling the machine.
Lifting Equipment
You can be injured if you use incorrect or faulty lifting
equipment. You must identify the weight of the item to
be lifted then choose lifting equipment that is strong
enough and suitable for the job. Make sure that lifting
equipment is in good condition and complies with all
local regulations.
Raised Equipment
Never walk or work under raised equipment unless
it is supported by a mechanical device. Equipment
which is supported only by a hydraulic device can
drop and injure you if the hydraulic system fails
or if the control is operated (even with the engine
stopped).
Make sure that no-one goes near the machine while
you install or remove the mechanical device.
Raised Machine
Never position yourself or any part of your body
under a raised machine which is not correctly
supported. If the machine moves unexpectedly you
could become trapped and suffer serious injury or be
killed.
Lightning
Lightning can kill you. Do not use the machine if there
is lightning in your area.
Machine Modifications
This machine is manufactured in compliance with
prevailing legislative requirements. It must not be
altered in any way which could affect or invalidate its
compliance. For advice consult your JCB dealer.

8. 27 - Driveline
36 - Track
03 - Steel Track
27 - 12 9813/8000-1 27 - 12
03 - Steel Track
Adjust ............................................................ 27-12
Remove and Install ....................................... 27-13
Store and Recommission .............................. 27-15
Adjust
Notice: Always make sure that the track tension
measurement is not less than specified or severe
strain to the track will result.
WARNING When opening the check valve always
stand to one side and loosen a little at a time until
grease starts to come out. If you over-loosen too
much grease could spurt out or the valve cover fly
out and cause serious injury.
Track Tension
1. Stop the machine on solid, level ground
2. Move the machine backwards and forwards
several times, then move the machine forwards
and stop it on level ground.
3. Stop the engine.
4. Check the track tension.
4.1. Place a long, stiff and straight piece of steel
or wood on top of the tracks touching above
the front idler and the top roller.
Figure 381.
A
A Track tension - measurement
5. Make sure the track tension is within the specified
limits.
Refer to: Driveline > Track > General
(Page 27-11).
6. If necessary, adjust the track tension.
6.1. To adjust the track tension, inject or release
grease from the check valve.

9. 27 - Driveline
36 - Track
03 - Steel Track
27 - 13 9813/8000-1 27 - 13
Figure 382.
6.2. Inject grease to increase the tension.
6.3. Release grease to decrease the tension.
6.4. When you open the check valve, always
stand to one side and loosen it a slowly until
the grease starts to release.
6.5. Do not loosen the check valve too much,
grease can spurt out or the cover of the
check valve can come off and cause serious
injury.
7. Never attempt to disassemble the check valve or
try to remove the grease point from the check
valve.
8. If there is a clearance between the idler wheel
shaft and the track frame, use pressure to apply
the grease.
9. If there is no clearance after the application of
grease the grease cylinder or recoil assembly
may be faulty.
10. Do not tension the tracks too much, this will
cause the track rail to wear the drive rollers and
sprocket.
11. Always make sure you adjust the track tension to
the specified limits. Incorrect tension can cause
wear to the drive sprocket and the track rail.
12. Repeat the procedure for the other track.
Remove and Install
WARNING When opening the check valve always
stand to one side and loosen a little at a time until
grease starts to come out. If you over-loosen too
much grease could spurt out or the valve cover fly
out and cause serious injury.
WARNING Stand clear and to one side of the
track while you remove the master pin. When the
master pin is removed the track could fall forward
and injure you.
Remove
1. Make the machine safe.
Refer to: Machine > Safety (Page 01-1).
2. Move the track link until the master pin is over
the take-up roller in the position shown, place
a wooden block under the track shoe. Refer to
Figure 383.
Figure 383.
3. Slacken the check valve to bleed out the grease.
Figure 384.
4. Disconnect the track link by removing the locking
pin and knocking out the master pin as follows:
4.1. Remove bolts and lift off the track shoe
plates adjacent to the master pin.

10. 27 - Driveline
36 - Track
03 - Steel Track
27 - 14 9813/8000-1 27 - 14
Figure 385.
4.2. Position a suitable hydraulic press so that
its ram aligns with the master pin.
Figure 386.
4.3. Insert the spacer bar between the master
pin and the hydraulic ram.
4.4. Slowly operate the press hydraulic ram and
press out the master pin.
4.5. Remove the seal rings from each side of the
chain link.
5. Operate the track drive motor to remove the
track.
6. Lift the lower frame clear of the track.
Figure 387.
6.1. Support the lower frame with wooden
blocks.
6.2. Using suitable equipment pull the track
clear of the machine.
Install
1. Position the lower frame on the track.
2. Move the track link.
Figure 388.
3. Clean the seal ring housing in the chain link.
Insert the seal rings and clamp into position.
Figure 389.
4. Using a plastic hammer, tap the upper link down
to align holes.
4.1. As the links overlap, the seal rings will be
held in position. Remove the clamps.
5. Insert the pointed guide pin from the inner face
and tap through its full length.

11. 27 - Driveline
36 - Track
03 - Steel Track
27 - 15 9813/8000-1 27 - 15
Figure 390.
6. Position a suitable hydraulic press so that its ram
aligns with the guide pin.
7. Insert the master pin into its locating hole.
8. Slowly operate the hydraulic press ram to press
the master pin into position.
Figure 391.
9. Install the track shoe plates.
Refer to: Driveline > Track > Shoe Plate
(Page 27-17).
10. Adjust the track tension.
Refer to: Driveline > Track > Steel Track
(Page 27-12).
Store and Recommission
During storage, or non continuous work periods in
wet environmental conditions, the track link joints can
seize.
Figure 392.
When the machine is used, wear occurs between the
pin and bush in the track link. This results in the gap
between the pin and bushes increasing.
Figure 393.
C
B
E
F
B Traction
C Gap increase
E Pitch elongation
F Wear
The metal particles worn from the pin and bush can
accumulate in the bush leading to seizure of the link
joint.
To help prevent seizure make sure to complete the
following steps.
1. Operate the machine (making sure that the
machine travels on its tracks) at least once per
week to keep the link joints flexible.
2. Do the undercarriage basic maintenance before
you stop the machine (washing and mud
cleaning).

12. 27 - Driveline
36 - Track
03 - Steel Track
27 - 16 9813/8000-1 27 - 16
3. Avoid allowing the machine to stand for long
periods in a wet environment (such as in wet soil
or water).
4. Do a regular check of the track tension to avoid
excessive joint wear (excessive track tension
affects joint internal wear).
Refer to: Driveline > Track > Steel Track
(Page 27-12).

13. 27 - Driveline
36 - Track
04 - Shoe Plate
27 - 17 9813/8000-1 27 - 17
04 - Shoe Plate
Check (Condition) .......................................... 27-17
Remove and Install ....................................... 27-18
Check (Condition)
If a track shoe plate is used when it is loose, it
may fail. Immediately tighten the track plate bolts
whenever they are found to be loose.
To check the track shoe plate bolts proceed as
follows:
1. Torque tighten the bolts in the sequence shown
and check that the nuts and shoe are closely
installed to the link joining surface.
Figure 394.
2. Start the engine and move the machine forwards
or backward to get access to the next set of track
bolts. Stop the engine.
3. Do the step 1 again.
4. Repeat the above procedures until all the track
bolts have been checked.
Table 175. Track Shoe Plate
Bolts - Checking Torques
Machines Checking Torque N·m
JS200 Series 756-801

14. 27 - Driveline
36 - Track
04 - Shoe Plate
27 - 18 9813/8000-1 27 - 18
Remove and Install
Remove
1. Start the engine and move the machine forwards
or backward to get access to the applicable set
of track shoe plate bolts. Stop the engine.
2. Remove the bolts followed by the track shoe
plate.
Install
1. Check that the track shoe plate and its fixing nuts
are closely installed to the link joining surface.
2. Torque tighten the bolts to the specified torque in
the sequence shown. Refer to Table 176.
Figure 395.
Table 176. Track Shoe Plate
Bolts - Tightening Torques
Machines Torque N·m
JS200 Series 840-890

15. 27 - Driveline
36 - Track
12 - Gearbox Sprocket
27 - 19 9813/8000-1 27 - 19
12 - Gearbox Sprocket
Remove and Install
Consumables
Description Part No. Size
JCB Threadseal 4102/1951 0.05L
WARNING When opening the check valve always
stand to one side and loosen a little at a time until
grease starts to come out. If you over-loosen too
much grease could spurt out or the valve cover fly
out and cause serious injury.
WARNING Stand clear and to one side of the
track while you remove the master pin. When the
master pin is removed the track could fall forward
and injure you.
Remove
1. Slacken the check valve to bleed out grease.
Figure 396.
2. Disconnect the track link.
Figure 397.
3. Lift the side of the undercarriage high enough
to permit drive sprocket removal. Support with
wooden blocks.
Figure 398.
4. Support the drive sprocket, remove the bolts and
lever it away from the gearbox unit.
Figure 399.
Install
1. Support the sprocket and position it on the
gearbox.
1.1. Install the bolts and washers, using sealant
on the bolt threads.
Consumable: JCB Threadseal
1.2. Tighten the bolts in a diagonal sequence to
the specified torque. Refer to Table 177.

16. 27 - Driveline
36 - Track
12 - Gearbox Sprocket
27 - 20 9813/8000-1 27 - 20
Figure 400.
A
A Bolt
2. Remove the wooden blocks. Connect the track
link.
3. Apply grease through the check valve to adjust
the track tension.
Refer to: Driveline > Track > Steel Track
(Page 27-12).
Figure 401.
Table 177. Torque Settings
Item A - Bolt size Torque N·m
M14 165
M16 290
M20
(1)
415
M20
(2)
506
(1) JS100 series machines
(2) JS300 series machines

17. 27 - Driveline
36 - Track
18 - Idler Wheel
27 - 21 9813/8000-1 27 - 21
18 - Idler Wheel
Remove and Install ....................................... 27-21
Disassemble and Assemble .......................... 27-23
Remove and Install
WARNING When opening the check valve always
stand to one side and loosen a little at a time until
grease starts to come out. If you over-loosen too
much grease could spurt out or the valve cover fly
out and cause serious injury.
WARNING Stand clear and to one side of the
track while you remove the master pin. When the
master pin is removed the track could fall forward
and injure you.
Remove
1. Slacken the check valve to bleed out grease.
Figure 402.
2. Disconnect the track link. Move the idler
wheel and recoil assembly to the end of the
undercarriage using a bar.
Figure 403.
3. Fasten a sling around the idler wheel and recoil
assembly and remove it from the undercarriage.

18. 27 - Driveline
36 - Track
18 - Idler Wheel
27 - 22 9813/8000-1 27 - 22
Figure 404.
4. Remove the bolts and remove the idler wheel
from the recoil unit.
Figure 405.
Install
1. Before fitting the idler wheel, check the oil level
at position A. If required, top up with the specified
oil. Assemble the idler wheel to the recoil unit and
fit the mounting bolts.
Figure 406.
2. Fasten a sling around the idler wheel and recoil
assembly and enter it into the undercarriage.
Figure 407.
3. Position the idler wheel in the undercarriage
using a bar.
Figure 408.
4. Connect the track link. Apply grease through the
check valve to adjust the track tension.
Refer to: Driveline > Track > Steel Track
(Page 27-12).
Figure 409.

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20. 27 - Driveline
36 - Track
18 - Idler Wheel
27 - 23 9813/8000-1 27 - 23
Disassemble and Assemble
Disassemble
1. Clean the idler wheel with a suitable solvent.
Remove the plug from the hub and drain the oil.
Figure 410.
B A
A Plug
B Hub
2. On one side of the unit only, remove the wire clip
or roll pin (later machines) and separate the hub
from the shaft.
Figure 411.
G D C E
C Hub
D Shaft
E Wire clip
G Idler wheel
3. Remove the O-ring from the shaft. Pull out the
shaft from the idler wheel.
Figure 412.
F
C D G
C Hub
D Shaft
F O-ring
4. Remove the wire clip or roll pin (later machines)
and separate the hub from shaft. Remove the O-
ring from the shaft.
Figure 413.
D
F
E C
C Hub
D Shaft
E Wire clip
F O-ring
5. Remove the floating seal from each hub using a
pry bar.
5.1. Remove the floating seal from each side of
the idler wheel using a pry bar.

21. 27 - Driveline
36 - Track
18 - Idler Wheel
27 - 24 9813/8000-1 27 - 24
Figure 414.
J
J
C
C
G
C Hub
G Idler wheel
J Floating seals
6. If badly worn or damaged, remove the bushes
from the idler wheel using a press or puller.
6.1. Protect parts from moisture and dust if left
dismantled for some time.
Figure 415.
K
K
G
G Idler wheel
K Bushes
Assemble
1. Clean all parts thoroughly in a suitable solvent.
Dry the shaft and bore of the idler wheel using
compressed air in a place free of dust and
moisture.
2. Check components for wear. Polish out
scratches and roughness using an oil stone.
Apply a coat of engine oil to all parts.
3. Carefully drive new bushes into the idler wheel,
using a suitable dolly.
Figure 416.
K
K
G
G Idler wheel
K Bushes
4. Apply a coating of grease and install a new
floating seal into each side of the idler wheel and
hub.
4.1. Ensure that the floating seals are fitted
correctly.

22. 27 - Driveline
36 - Track
18 - Idler Wheel
27 - 25 9813/8000-1 27 - 25
Figure 417.
J
J
C
C
C
G
J J
G
C Hub
G Idler wheel
J Floating seals
5. Grease a new O-ring and install at one end of the
shaft. Install the shaft into the hub. Fit a new wire
clip or roll pin (later machines).
Figure 418.
D
F
E C
C Hub
D Shaft
E Wire clip
F O-ring
6. Coat the shaft with grease. Clean the metallic
face of the floating seal and coat it with engine
oil. Insert the shaft into the idler wheel.
Figure 419.
F
C D G
C Hub
D Shaft
F O-ring
G Idler wheel
7. Apply grease to a new O-ring and install it on the
shaft.
7.1. Clean the metallic face of the floating seal
and coat it with engine oil.
7.2. Install the hub onto the shaft. Fit new wire
clip or roll pin (later machines).
7.3. Wrap sealing tape around the plug with
one thread remaining uncovered. Insert this
plug but leave the other one out until after
testing.