service repair manual

1. SERVICE MANUAL
EXCAVATOR
JS115, JS115 [T2/3],
JS130, JS130 [T2/3], JS145
EN - 9813/7050 - ISSUE 1 - 04/2018
This manual contains original instructions, verified by
the manufacturer (or their authorized representative).
Copyright 2017 © 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. 27 - Driveline
36 - Track
00 - General
27 - 11 9813/7050-1 27 - 11
00 - General
Introduction .................................................... 27-11
Component Identification ............................... 27-12
Check (Condition) .......................................... 27-13
Introduction
The left and right track assemblies are installed on
the machine undercarriage.
Each track consists of a chain and a series of bolt on
shoe plates.
The gearbox sprocket is engaged with the chain and
transmits the drive from the track motor gearbox to
the chain.
The chain runs on several bottom rollers mounted
on the undercarriage. The rollers carry the weight
of the machine. Top rollers keep the chain clear of
the undercarriage. The number of top and bottom
rollers is dependent on the machine variant. A track
guide prevents the chain being forced sideways off
the bottom rollers.
The chain runs on an idler wheel at the opposite end
of the carriage. The idler wheel bracket mounting can
slide forwards and backwards in the undercarriage.
This allows the chain to be tensioned using a grease
cylinder. A spring loaded recoil unit acts as a shock
absorber. This allows the idler wheel to move in the
carriage if the track is subjected to shock loads, when
travelling over rough ground for example.
Figure 329. Typical track installation
E
D
B
A
C
F
G
A Top roller
B Shoe plate
C Idler wheel
D Undercarriage
E Bottom roller
F Gearbox sprocket
G Track motor gearbox

3. 27 - Driveline
36 - Track
00 - General
27 - 12 9813/7050-1 27 - 12
Component Identification
Figure 330. Typical track installation
F M E
D
G
K J H
C
A B
L
A Top roller B Shoe plate
C Idler wheel D Undercarriage
E Bottom roller F Gearbox sprocket
G Track motor gearbox H Idler wheel bracket mounting
J Recoil unit K Grease cylinder
L Track guide (if installed) M Chain

4. 27 - Driveline
36 - Track
00 - General
27 - 13 9813/7050-1 27 - 13
Check (Condition)
The track assembly is subjected to high forces and
operates in a harsh environment. To enable the
maximum service life, check the condition of the
assembly at regular intervals as follows.
1. Clean off mud and debris from the track and
undercarriage.
2. Check that the track tension is correct.
Refer to: PIL 27-36-03.
3. Check the gearbox sprocket teeth for excessive
wear.
3.1. Make sure the fixing bolts are installed and
tightened to the correct torque.
4. Check the steel track chain for defective pins,
bushes and links.
4.1. Measure the wear status.
Refer to: PIL 27-36-03.
5. Check that the shoe plates are not excessively
worn or distorted.
5.1. Make sure the fixing bolts are installed and
tightened to the correct torque.
6. Check the condition of the top and bottom rollers.
6.1. Check that the wearing diameters are within
the wear limits.
6.2. Check that the fixing bolts are installed and
tightened to the correct torque.
6.3. Check that there are no oil leaks.
6.4. Check that the rollers rotate with the chain.
7. Check the condition of the track guide (if
installed).
7.1. Check that it is free from distortion and
excessive wear.
7.2. Check that the fixing bolts are installed and
tightened to the correct torque.
8. Check the condition of the idler wheel.
8.1. Make sure that the idler wheel rotates with
the chain.
8.2. Check the wearing diameter for excessive
wear.
8.3. Check that there no oil leaks.
8.4. Check that the axle mounting bracket fixing
bolts are installed and tightened to the
correct torque.
9. Check the condition of the tensioner / recoil unit.
9.1. Make sure the recoil spring is free from
packed material such as soil, clay and sand.
9.2. Make sure the recoil spring is not broken.
9.3. Check that the grease cylinder seals and
check valve maintain the pressure in the
grease cylinder.
If the track components show signs of premature
wear or failure, investigate the operating conditions.
1. Make sure the machine is being operated as
intended, especially with the track motors at the
rear when travelling or excavating.
2. Make sure that the applicable maintenance
schedule is being followed.
Refer to: PIL 78-24.
3. Make sure that the correct shoe plates are
installed for the operating environment.
4. Make sure that packed material is being removed
from the undercarriage when necessary.
Excessive packing of materials such as soil, clay
and sand causes premature wear of the track
and undercarriage components.
5. If the machine is stored in a harsh environment,
such as wet freezing conditions, make sure the
operator follows the correct procedures.
Refer to: PIL 27-36-03.

5. 27 - Driveline
36 - Track
03 - Steel Track
27 - 14 9813/7050-1 27 - 14
03 - Steel Track
Introduction .................................................... 27-14
Technical Data ............................................... 27-15
Component Identification ............................... 27-17
Check (Condition) .......................................... 27-18
Adjust ............................................................ 27-25
Remove and Install ....................................... 27-26
Store and Recommission .............................. 27-28
Introduction
The steel track consists of track links which are
connected using pins and bushes to form a chain.
The ends of the chain are connected by means
of a removable master pin. This enables removal
and installation of the track. The master pin has a
tapered recess in the centre of its diameter to enable
identification.
The steel track is a wear item. When it is at the
end of its service life it must be replaced. It is
possible to extend the service life of the pins and
bushes by dismantling the chain and assembling with
the pins and bushes rotated to present new wear
surfaces, this is known as 'turning'. The time involved
may make this uneconomical, it may be more cost
effective to replace the chain assembly with a new
one.
Figure 331.
A
A Steel track chain

6. 27 - Driveline
36 - Track
03 - Steel Track
27 - 15 9813/7050-1 27 - 15
Technical Data
Track Tension
Measure the track tension and compare the
measurement with the data in the table. Adjust the
tension if necessary. Refer to: PIL 27-36-03.
Figure 332.
A
A Measurement - track tension
Table 133.
Minimum Maximum
30 mm 25 mm
Pin and Bush Wear Guide (Track Pitch)
Measure the track pitch and compare the
measurement with the data in the table. Follow the
correct procedure.
Figure 333.
A
A Dimension A
Table 134.
110 - 145 se-
ries
160 - 235 se-
ries
Pitch (new con-
dition)
171.05 mm 190 mm
Wear % Dimension A
mm
Dimension A
mm
0 686.8 761.0
10 688.0 762.3
20 689.2 763.6
30 690.4 764.9
40 691.6 766.2
50 692.6 767.5
60 694.0 768.8
70 695.2 770.1
80 696.4 771.4
90 697.6 772.7
100 698.8 774.0
110 701.6 776.5
120 704.2 779.5
Bush Wear Guide
Measure the minimum bush diameter and compare
the measurement with the data in the table. Follow
the correct procedure.

7. 27 - Driveline
36 - Track
03 - Steel Track
27 - 16 9813/7050-1 27 - 16
Figure 334.
A
A Dimension A
Table 135.
115, 130 series 130HD - 235
series
Diameter (new
condition)
50.8 mm 58.7 mm
Wear % Diameter A -
Normal / High
impact mm
(1)
Diameter A -
Normal / High
impact mm
(1)
10 50.5 / 50.6 58.4 / 58.4
20 50.4 / 50.5 58.0 / 58.1
30 50.0 / 50.2 57.6 / 57.9
40 49.7 / 50.0 57.1 / 57.4
50 49.2 / 49.6 56.8 / 57.1
60 48.8 / 49.4 56.4 / 56.9
70 48.5 / 49.1 56.0 / 56.6
80 47.7 / 48.6 55.6 / 56.5
90 46.6 / 48.0 54.9 / 56.3
100 45.6 / 47.4 54.1 / 55.9
110 44.8 / 46.7 53.2 / 55.2
120 43.8 / 46.1 54.8 / 52.5
(1) Wear allowance depends on the operating
ground conditions. When operating on hard ground
components are subject to high impact loads,
allowable wear is reduced to avoid component
failure.
Track Link Wear Guide
Measure the link height and compare the
measurement with the data in the table. Follow the
correct procedure.
Figure 335.
A
A Dimension A
Table 136.
110 - 145 se-
ries
160 - 235 se-
ries
Wear % Dimension A
mm
Dimension A
mm
0 96.0 106.0
10 95.4 105.3
20 94.9 104.6
30 94.3 103.9
40 93.7 103.2
50 93.3 102.5
60 92.6 101.9
70 92.1 101.1
80 91.4 100.2
90 90.8 99.5
100 90.0 98.8
110 89.3 97.8
120 88.6 97.0

8. 27 - Driveline
36 - Track
03 - Steel Track
27 - 17 9813/7050-1 27 - 17
Component Identification
The illustration shows a chain link with a normal pin,
bush and sealing washers. The single master pin,
master bush and spacer assembly is also shown.
Figure 336. Typical track link assembly
G
F
D C J
AB
E
H
H
E
D
C
A
B
A
E
G
F
F
E
A Spacers (master bush) B Master bush
C Master pin D Pin
E Links (right) F Seal washers
G Bush H Links (left)
J Tapered recess

9. 27 - Driveline
36 - Track
03 - Steel Track
27 - 18 9813/7050-1 27 - 18
Check (Condition)
Measuring the Normal Wear Status
To check the normal wear status of the steel track
chain proceed as follows.
1. Make the machine safe.
Refer to: PIL 01-03.
2. Clean the tracks and undercarriage. It will not be
possible to get accurate wear measurements if
there is an accumulation of dirt and debris on the
components.
Refer to: PIL 01-33.
Link Rail Surface Wear Status
As the link rail surface wears the distance between
the rail and the underside of the shoe plate reduces.
Figure 337.
A
A Link rail surface wear area
Measure the distance as follows.
1. Use a suitable depth gauge to make the
measurements as shown.
Figure 338.
D
A B
C
A Shoe plate underside
B Track pin
C Track link - rail wear face
D Depth gauge
1.1. Position the gauge on the outside of the
links in-line with the ends of the track pins.
1.2. Make sure the gauge is flat against the rail
surface and perpendicular to the underside
of the shoe plate
1.3. Take measurements to the specified degree
of accuracy.
Length/Dimension/Distance: 0.25 mm
2. Compare the measurements with the track
link wear guide given in Technical Data (PIL
27-36-03).
2.1. Use the data to obtain the wear percentage
value.
Track Pitch (Internal Wear Status)
As the internal mating faces of the track pins and
bushes wear, the pitch distance of the track chain
links increases. Measure the distance as follows.
1. Use an old track pin or suitable bar to stretch the
chain as shown.
1.1. Place the pin on the gearbox sprocket and
slowly operate the track motor so that the
chain is tensioned. Do not operate the track
motor past the position shown. Get the help
of an assistant.
2. Use a suitable tape measure calibrated in the
increments specified and measure the distance
over four chain links.
Length/Dimension/Distance: 0.5 mm

10. 27 - Driveline
36 - Track
03 - Steel Track
27 - 19 9813/7050-1 27 - 19
Figure 339.
A
B
C
A Tape measure
B Track pin
C Old track pin
2.1. Measure from one side of a track pin to the
same side of the 5th pin away (four chain
links).
2.2. Make sure the master pin is at least
three links away form the section being
measured.
2.3. Do not place the end of the tape measure
at the first pin. Start the measurement at a
convenient increment along the tape.
3. Repeat the process for at least two different
sections of the track.
4. Divide the results by four to obtain the chain link
pitch.
5. Compare the measurements with the pin and
bush wear guide given in Technical Data (PIL
27-36-03).
5.1. Use the data to obtain the wear percentage
value.
Bush External Wear Status
As the external mating face of the bushes engage
with the gearbox sprocket the bush surface wears.
Measure the wear as follows.
Figure 340.
B
A
A Bush
B Caliper
1. Use a suitable caliper to measure the smallest
diameter of the bushes. Avoid false readings as
follows.
1.1. Make sure the bush diameter surface is
clean.
Figure 341. Debris on bush
1.2. Keep the caliper perpendicular to the axis
of the bush.
Figure 342. Caliper at wrong angle
1.3. Make sure the caliper is passed completely
over the bush.

11. 27 - Driveline
36 - Track
03 - Steel Track
27 - 20 9813/7050-1 27 - 20
Figure 343. Caliper not passed over the bush
1.4. Do not force the caliper over the bush
diameter, the caliper can spread and then
spring back. The reading will be less than
the bush diameter.
Figure 344. Caliper forced over the bush
1.5. Make sure to measure the smallest
diameter on the bush. Inspect it carefully,
there may be more than one worn area.
Figure 345. Caliper not mea-
suring smallest diameter
1.6. Practise using the caliper on a bush
removed from a track. Make sure you can
get repeatable results to the necessary
accuracy.
Length/Dimension/Distance: 0.25 mm
2. Compare the measurements with the bush wear
guide given in Technical Data (PIL 27-36-03)
2.1. Use the data to obtain the wear percentage
value.
General Wear Assessment
In addition to checking the steel track components
for normal wear a general assessment of their
overall condition should be carried out. This can help
identify operational issues and if the use of repair
procedures to extend the service life of the chain
are applicable. Repair procedures may not suitable
if components are worn beyond their service limit, or
show excessive defects not caused by normal wear
for example. In addition, the condition of the other
undercarriage components must be assessed before
repairing or replacing the track chain.
Track Link Condition Assessment
Check the track links for the following.
Scalloping
The rail surface is worn with uneven scallops typically
caused by over tensioning or snaking track. Can be
repaired in most cases.
Check the track chain tension.
Figure 346.
A
A
B
A Wear - due to reduced contact area with idler
wheel
B Wear - due to reduced contact area with bottom
rollers
Side Wear
The side of the rail is worn excessively. Typically
caused by over tensioned or snaking track, frequent
traversing the side of steep slopes, frequent turning
or over sized shoe plates. Repair not recommended.
Check the track chain tension. Check the shoe plate
width is compatible with the operating environment.

12. 27 - Driveline
36 - Track
03 - Steel Track
27 - 21 9813/7050-1 27 - 21
Figure 347.
A
A Wear
Gouging
The side of the track link shows gouging from contact
with the gearbox sprocket teeth. Typically caused by
snaking track, frequent traversing the side of steep
slopes, frequent turning or over sized shoe plates.
Check the alignment of the track and gearbox
sprocket. Check the shoe plate width is compatible
with the operating environment. Repair not
recommended.
Figure 348.
A
A Gouging
Pin Boss Wear
The top of the track link pin bosses are worn from
contact with the bottom rollers. This can be caused
by excessive bottom roller wear or the track link rail
surface worn more than 100 %. If the track pin
retention is still effective repair the track link rail.
Check the wear status of the track links and bottom
rollers. Replace the bottom rollers if applicable.
Figure 349.
A
A Wear
Counterbore Elongation
The bush locating counterbores in the track links are
elongated. Typically caused by elongated pitch due
to internal wear on the pins and bushes.
Check the track pitch (internal Wear) status. Replace
or turn the pins and bushes as applicable. If the bush
retention is effective the links can be used.
Figure 350.
A
A Counterbore elongation
Face Wear
The track links are worn at their rotating faces.
Typically caused by operating in highly abrasive
material, frequent traversing on the side of steep
slopes, frequent turning or over sized shoe plates.
Check the shoe plate width is compatible with the
operating environment. Repair not recommended.
Figure 351.
A
A Wear

13. 27 - Driveline
36 - Track
03 - Steel Track
27 - 22 9813/7050-1 27 - 22
Pin Boss End Wear
The ends of the pin bosses in the track links are
worn due to contact with the track guides (if installed).
Typically caused by bent track guides or incorrect
chain tension.
Check the condition of the track guides, replace as
applicable. Check the track chain tension.
Figure 352.
A
A Wear
Chipping or Flaking
The track link rail faces are chipped or flaking due
to impact with the bottom rollers. This is normal
especially on heavy machines.
Check the shoe plate width is compatible with
the operating environment. Check the track chain
tension.
Figure 353.
A
A Chipping / flaking
Cracks
The track link has cracks due to bending during high
impact force with the bottom rollers.
Check the shoe plate width is compatible with
the operating environment. Check the track chain
tension. Repair is not possible, cracking can cause
the track chain to separate.
Figure 354.
A A
A
A
A
A Cracks
Pin and Bush Bore Enlargement
The track link has enlarged location bores for the
pin or bush. Typically caused by the use of incorrect
tooling when removing / installing the pins and
bushes. In addition high bending forces can cause
the pins and bushes to slide in the bores, causing
wear.
Check the shoe plate width is compatible with
the operating environment. Check the track chain
tension. Check the tooling before removing /
installing pins and bushes. Pin and bush retention is
not effective, do not use the affected track links.
Track Bush Condition Assessment
Check the track bushes for the following.
Reverse Side Drive Wear
When the machine operates in reverse travel
direction the bush wears at its mating face with the
gearbox sprocket between 30 –65 ° from vertical
as shown. Excessive wear can cause cracks in the
bush.
Measure the bush external wear status. Check the
track chain tension.
When turning the bushes for extended service life,
the reverse side drive wear will be closer to the
forward drive side of the bush. Bushes worn close to
100 % or more, are less suitable for turning.

14. 27 - Driveline
36 - Track
03 - Steel Track
27 - 23 9813/7050-1 27 - 23
Figure 355.
30
65
Forward Side Drive Wear
When the machine operates in forward travel
direction the bush wears at its mating face with the
gearbox sprocket between 30 –60 ° from vertical
as shown. Excessive wear can cause cracks in the
bush. Internal wear in the same position can cause
the bush to wear completely through.
Measure the bush external wear status. Measure the
track pitch. Check the track chain tension.
Figure 356.
30
60
End Wear
The ends of the bushes are worn. Typically caused
by abrasive material between the bush and the seals
or high side loading from frequent traversing the side
of steep slopes.
Check the shoe plate width is compatible with the
operating environment.
When turning the bushes for extended service life,
lubrication sealing may be defective.
Figure 357.
A
A Wear
End Cracks
The ends of the bushes have cracks. Typically cased
by impact with the counterbore due to internal wear
or track snaking. Repair not recommended.
Figure 358.
A
A
A
A Cracks
Counterbore Wear
The bush is worn at the ends of the outer diameter
on its reverse drive side. This is caused by internal
wear. As the pitch increases the bushes wear against
the track links on the reverse drive side.
Check the track pitch.
When turning the bushes for extended service life,
lubrication sealing may be defective.

15. 27 - Driveline
36 - Track
03 - Steel Track
27 - 24 9813/7050-1 27 - 24
Figure 359.
A
A
A Wear
Wall Cracks
The bush has cracks in its wall due to impact with
the gearbox sprocket. Caused by excessive wear,
incorrect chain tension or over sized shoe plates.
Check the shoe plate width is compatible with
the operating environment. Check the track chain
tension. Repair is not recommended.
Figure 360.
A
A Cracks
Track Pin Condition Assessment
Check the track pins for the following.
Diameter Wear
The pins are worn on one side of the outside
diameter due to contact with abrasive material or
bush. Caused by sealing failure, excessive packing
of abrasive material in the track, extended high
speed travel, incorrect track tension, or over sized
shoe plates.
Check the shoe plate width is compatible with
the operating environment. Check the track chain
tension. Check the track pitch.
Pins can be turned for an extended service life.
Figure 361.
FDS
A
A Wear
FDS Forward direction side
End Wear
One, or both ends of the pins are worn due to contact
with track guides. Caused by track snaking, bent
track guards, worn rollers or frequent traversing on
the side of steep slopes.
Check the track chain tension. Check the condition
of the track guides. Check the condition of the top
and bottom rollers.
When turning pins for extended service life remove
the sharp edges on the end of the pins. Sharp edges
can remove material from the track link pin bosses
during assembly. This will reduce pin retention.
Figure 362.
FDS
RDS
A
A Wear
FDS Forward direction side
RDS Reverse direction side
Loose Pins
Pin not retained in the track link pin bosses. Caused
by excessive impact or bending forces, cracked track
links or incorrect pin installation procedures.
Check the condition of the track links. Check the
shoe plate width is compatible with the operating
environment. Check the shoe plate retaining bolts
are present and tightened to the correct torque value.
Track link repair is not recommended.

16. 27 - Driveline
36 - Track
03 - Steel Track
27 - 25 9813/7050-1 27 - 25
Figure 363.
Broken Pin
The track pin is broken. Caused by operating the
track components past their wear limit, incorrect track
tension, excessive loading due to material packing
or trapped between the bush and gearbox sprocket.
Replace all the affected components. A broken track
pin can cause severe damage to other components.
Check the shoe plate width is compatible with
the operating environment. Check the track chain
tension. Check the track pitch.
Figure 364.
A
A Break
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, find the slack point, 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 365.
A
A Track tension - measurement
5. Make sure the track tension is within the specified
limits.
Refer to: PIL 27-36-00.
6. If necessary, adjust the track tension.
6.1. To adjust the track tension, inject or release
grease from the check valve.

17. 27 - Driveline
36 - Track
03 - Steel Track
27 - 26 9813/7050-1 27 - 26
Figure 366.
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: PIL 01-03.
2. Move the track link until the master pin is over the
idler wheel in the position shown, place a wooden
block under the track shoe. Refer to Figure 367.
Figure 367.
2.1. The master pin is identified by a tapered
recess in the centre of its diameter.
3. Slacken the check valve to bleed out the grease.
Figure 368.
4. Disconnect the track link by removing the master
pin as follows.
4.1. Remove bolts and lift off the track shoe
plates adjacent to the master pin.

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19. 27 - Driveline
36 - Track
03 - Steel Track
27 - 27 9813/7050-1 27 - 27
Figure 369.
4.2. Position a suitable hydraulic press so that
its ram aligns with the master pin.
Figure 370.
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.
5. Operate the track drive motor to remove the
track.
6. Lift the lower frame clear of the track.
Figure 371.
6.1. Support the lower frame with wooden
blocks.
6.2. Using suitable equipment pull the track
clear of the machine.
Install
1. Clean off old grease, mud and debris from the
master pin, master bush and spacers.
1.1. Check the components for signs of
excessive wear. If necessary replace them
with new components.
2. Position the lower frame on the track.
3. Move the track link.
Figure 372.
4. If necessary clean the spacer housings in the
chain links. Insert the spacers and clamp into
position.
Figure 373.
5. Using a plastic hammer, tap the upper link down
to align holes.
5.1. As the links overlap, the spacers will be held
in position. Remove the clamps.
6. Insert the pointed guide pin from the inner face
and tap through its full length.

20. 27 - Driveline
36 - Track
03 - Steel Track
27 - 28 9813/7050-1 27 - 28
Figure 374.
7. Position a suitable hydraulic press so that its ram
aligns with the guide pin.
8. Put some grease on the center diameter of the
master pin.
9. Insert the master pin into its locating hole.
10. Slowly operate the hydraulic press ram to press
the master pin into position.
Figure 375.
11. Install the track shoe plates.
Refer to: PIL 27-36-04.
12. Adjust the track tension.
Refer to: PIL 27-36-03.
Store and Recommission
During storage, or non continuous work periods in
wet environmental conditions, the track link joints can
seize.
Figure 376.
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 377.
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).

21. 27 - Driveline
36 - Track
03 - Steel Track
27 - 29 9813/7050-1 27 - 29
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: PIL 27-36-03.