jcb 3TS-8T User manual

SERVICE MANUAL
SKIDSTEER LOADER
3TS-8T, 3TS-8W
EN - 9813/7400
ISSUE 1 - 03/2017
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
24 - Brake System
27 - Driveline
30 - Hydraulic System
33 - Electrical System
72 - Fasteners and Fixings
75 - Consumable Products
78 - After Sales

15 - Engine
06 - Cylinder Head
00 - General
15 - 45 9813/7400-1 15 - 45
Remove and Install
Special Tools
Description Part No. Qty.
Torque Wrench
(10-100Nm)
993/70111 1
Consumables
Description Part No. Size
Cleaner/Degreaser
- General purpose
solvent based parts
cleaner
4104/1557 0.4L
Before Removal
1. This procedure requires service parts. Make sure
you have obtained the correct parts before you
start, refer to Parts Catalogue.
2. Make sure that the engine is safe to work on. If
the engine has been running, let it cool before
you start the service work.
3. Get access to the engine.
4. Remove the thermostat, refer to (PIL 21-12).
5. Remove the fuel pipes, refer to (PIL 18-96).
6. Remove the rocker cover, refer to (PIL 15-42).
7. Remove the fuel injectors, refer to (PIL 18-18).
8. Remove the rocker assembly, refer to (PIL
15-42).
9. Remove the exhaust manifold, refer to (PIL
18-24).
10. Remove the inlet manifold, refer to (PIL 18-24).

15 - Engine
06 - Cylinder Head
00 - General
15 - 46 9813/7400-1 15 - 46
Figure 115.
16
12
8
4
1
5
9
13
17
2
10
6
14
18
7
3
1
1
15
19
22
21
20
0
°
+90
°
+180
°
Y
X
1-18 Cylinder head fixing bolts (x18) 19 Cylinder head
20 Crankcase 21 Location dowels (x2)
22 Cylinder head gasket

15 - Engine
06 - Cylinder Head
00 - General
15 - 47 9813/7400-1 15 - 47
Remove
1. Progressively remove the cylinder head bolts in
reverse order, starting at bolt 18. Note that the
bolts MUST NOT be re-used. Discard the bolts.
2. Carefully lift the cylinder head from the
crankcase. If necessary use a soft face hammer.
DO NOT use a lever to separate the cylinder
head from the crankcase. Discard the head
gasket.
3. Using a suitable cleaning agent, carefully remove
all traces of the head gasket material from the
cylinder head and crankcase mating faces.
Consumable: Cleaner/Degreaser - General
purpose solvent based parts cleaner
4. Check the cylinder head and crankcase mating
faces for signs of damage and distortion, refer to
Technical Data (PIL 15-06).
Before Assembly
1. Obtain the correct new cylinder head bolts. Note
that the original bolts MUST NOT be re-used.
2. Obtain the correct replacement head gasket.
Note the number of identification holes as shown
at X.
3. Make sure that all items are clean and free from
damage and corrosion.
Assemble
The cylinder head bolts are tightened using a torque
and angle method, refer to Fasteners and Fixings,
General, Introduction (PIL 72-00).
1. Replacement is the reversal of the removal
procedure.
2. Make sure that the location dowels are correctly
installed into the crankcase. Use a dowel punch
to install the dowels as required.
3. Position a new head gasket on to the crankcase
mating face. Make sure that the gasket is
installed the correct way around and correctly
located over the dowels.
4. Lower the cylinder head on to the crankcase.
Make sure that the cylinder head is correctly
located on the dowels. Install new cylinder head
bolts. Tighten the bolts in five stages, use the
torque and angle method, refer to Fasteners and
Fixings, General, Introduction (PIL 72-00).
4.1. Tighten the bolts, starting with the middle
pair and working outwards (in sequence
1-18) to the 1st stage pre-torque.
Special Tool: Torque Wrench (10-100Nm)
(Qty.: 1)
4.2. Then, further tighten the bolts, starting with
the middle pair and working outwards (in
sequence 1- 18) to the 2nd stage pre-
torque.
4.3. Then, re-tighten the bolts, starting with
the middle pair and working outwards (in
sequence 1-18) to the 3rd stage pre-torque.
4.4. Use the angle gauge to angle tighten the
bolts, starting with the middle pair and
working outwards (in sequence 1-18) to the
4th stage pre-torque. As a visual check,
matchmark the bolts to the cylinder head
before you start. When the bolts have
been angle tightened, the matchmarks will
appear as shown at Y.
4.5. Finally, angle tighten the bolts, starting with
the middle pair and working outwards (in
sequence 1- 18) for the final stage torque.
Table 47.
Description Torque Value
Cylinder head to
crankcase bolts 1-18
- first stage torque 40N·m
- second stage torque 75N·m
- third stage torque 75N·m
- fourth stage torque 90°
- final stage torque 180°

15 - Engine
09 - Bedplate
00 - General
15 - 49 9813/7400-1 15 - 49
00 - General
Introduction .................................................... 15-49
Remove and Install ....................................... 15-50
Introduction
The bedplate acts as the main strength component
of the engine. it maintains the correct alignment and
supports the weight of the internal components.
Figure 116.
1
2
1Bedplate
2Crankcase

15 - Engine
09 - Bedplate
00 - General
15 - 50 9813/7400-1 15 - 50
Remove and Install
Special Tools
Description Part No. Qty.
Template for Sealant
Bedplate to Crankcase
(4 Cyl)
892/12356 1
Torque Wrench
(10-100Nm)
993/70111 1
Consumables
Description Part No. Size
Cleaner/Degreaser
- General purpose
solvent based parts
cleaner
4104/1557 0.4L
CAUTION This component is heavy. It must only
be removed or handled using a suitable lifting
method and device.
Before Removal
1. This procedure requires service parts. Make
sure you have obtained the correct service parts
before you start, refer to Parts Catalogue.
2. Make sure that the engine is safe to work on. If
the engine has been running, let it cool before
you start the service work.
3. Remove the engine, refer to (PIL 15-00).
4. Remove the drive belt, refer to (PIL 15-18).
5. Remove the crankshaft pulley, refer to (PIL
15-12).
6. Remove the oil sump, refer to (PIL 15-45).
7. Disconnect and remove the fuel pipes from the
injectors, refer to (PIL 18-96).
8. Remove the rocker cover, refer to (PIL 15-42).
9. Remove the fuel injectors, refer to (PIL 18-18).
10. Remove the rocker assembly including the push
rods, refer to (PIL 15-42).
11. It is not necessary to remove the cylinder head
assembly to remove the crankshaft. If however
the cylinder head needs to be removed for other
reasons (for piston and connecting rod removal
for example) remove it now, refer to (PIL 15-06).
12. Remove the fuel injection pump, refer to (PIL
18-18).
13. Remove the starter motor, refer to (PIL 15-75).
14. Remove the high duty PTO (Power Take-Off)
device (if installed).
15. Position the engine upside down in a suitable jig
or fixture, supported at the front of the cylinder
block.
16. Remove the flywheel, refer to (PIL 15-54).
17. Remove the flywheel housing, refer to (PIL
15-54).
18. Remove the fuel injection pump drive gear, refer
to (PIL 15-51).
19. Remove the oil pump, refer to (PIL 15-60).
20. Remove the high duty PTO idler drive gear (if
installed), refer to (PIL 15-51).
21. Remove the crankshaft drive gear, refer to (PIL
15-51).
22. Remove the camshaft, refer to (PIL 15-15).
23. Remove the rear timing case, refer to (PIL
15-51).
24. If the pistons and connecting rods have not been
removed, undo and remove the main bearing
caps, refer to (PIL 15-12).

15 - Engine
09 - Bedplate
00 - General
15 - 51 9813/7400-1 15 - 51
Figure 117.
5
1
18
18
18
18
18
9
11
4
8
12
X
13
18
3
7
6
2
10
P3
1-10 Main bearing bolts (x10) 11 Bedplate peripheral bolts (x16)
12 Bedplate 13 Crankcase
18 Upper bearing shell (x5) P3 O-ring (if installed)
T1 Lifting bolts (obtain locally)

15 - Engine
09 - Bedplate
00 - General
15 - 52 9813/7400-1 15 - 52
Remove
1. Remove the bedplate peripheral bolts.
2. Progressively remove the main bearing bolts in
reverse order starting at bolt 10. The bolts MUST
NOT be re-used. Discard the bolts.
3. Install the four temporary lifting bolts. Carefully
separate the bedplate from the crankcase. Use
suitable lifting equipment (if the bedplate is lifted
manually, two people will be required). DO NOT
use a lever to separate the bedplate.
4. Remove and discard the O-ring.
5. Carefully remove the upper bearing shells from
the bedplate, remove the bedplate.
Figure 118.
18
18
18
18
18
T6
T6
T6
18
12
T6
P3
13
11
A (T5)
V
Y
Y
P2
5
1
9
4
8
3
7
6
2
10
T4
T4
W
P2
B (T5)
Y
Y
P2
X
1-10 Main bearing bolts 11 Bedplate peripheral bolts (x16)
12 Bedplate 13 Crankcase
18 Lower bearing shells (x5) ALeft side template
BRight side template T3 Angle Gauge (obtain locally)

15 - Engine
09 - Bedplate
00 - General
15 - 53 9813/7400-1 15 - 53
T4 Guide pins (x2 obtain locally) T5 Sealant template
T6 Lifting bolts (x4 obtain locally) VSealant template portion for removal
WBearing tab XRear main bearing
YBearing location tab P2 Anaerobic sealant
P3 O-ring

15 - Engine
09 - Bedplate
00 - General
15 - 54 9813/7400-1 15 - 54
Before Installation
1. Clean off all traces of the old sealant compound
from the crankcase and bedplate mating faces.
2. Use a suitable degreasing agent to carefully
clean the main bearing saddles in the bedplate
and crankcase. Take care not to block the oil
ways or the piston cooling jets.
Consumable: Cleaner/Degreaser - General
purpose solvent based parts cleaner
Important: Anaerobic sealant will not start to cure
whilst it is open to the atmosphere, however when
air is excluded (for instance when the two parts are
put together) it will immediately start to harden. Make
sure that all the necessary tools, bolts etc. are readily
available prior to assembling the components. The
parts must be installed and tightened to the correct
torque value within 5 minutes (with a maximum
permissible time of 15 minutes).
Important: BEFORE installing the bedplate: DO NOT
rotate the crankshaft. Make sure that the upper main
bearing shells are flush with the bottom face of the
crankcase.
Install
1. The installation procedure is the opposite of the
removal procedure. Additionally do the following
steps.
2. Make sure that all items are clean and free from
damage and corrosion.
3. Install the two guide pins T4 to the crankcase
bedplate fixing holes as shown.
4. Install the four lifting bolts T6 to the bedplate as
shown.
5. Install a new O-ring at the bedplate.
6. Use a suitable degreasing agent to clean both
sides of the lower bearing shells. Assemble the
lower bearing shells into the bedplate. Lubricate
the lower bearing shells with clean engine oil.
Note: Make sure that the location tab W engages
in the slot as shown.
Consumable: Cleaner/Degreaser - General
purpose solvent based parts cleaner
7. Note: The sealant template T5 is used on
the crankcase, NOT the bedplate. The sealant
template T5 comprises of two pieces, A and B.
Modify the template A by removing portion V.
Special Tool: Template for Sealant Bedplate to
Crankcase (4 Cyl) (Qty.: 1)
8. Locate the holes in the templates A and B using
four fixing bolts at positions Y. Use the templates
as a guide apply beads of sealant P2 around the
crankcase/bedplate mating face as shown to the
dimension specified.
Length/Dimension/Distance: 1.5mm
9. Remove the four fixing bolts at positions Y.
Remove the templates A and B, make sure
you do not smudge the sealant. Discard the
templates.
10. Add beads of sealant P2 around the four bolt
holes at positions Y, so as to join the sealant
beads as shown at X.
11. Make sure that the location guide pins T4 are in
position in the crankcase. Assemble the bedplate
to the crankcase use the alignment guide pins.
12. Note: The bedplate is heavy. Two people will
be required to lift and rotate the bedplate safely
on to the crankcase. Install new main bearing
bolts 1-10. Tighten the bolts to the correct torque
value in pairs, starting in the centre and working
outwards (in sequence 1-10) to the 1st stage pre-
torque.
Special Tool: Torque Wrench (10-100Nm) (Qty.:
1)
13. Install the bedplate peripheral bolts. Tighten the
bolts to the correct torque value.
14. After installation and tightening the bedplate
peripheral bolts, further tighten the main bearing
bolts in pairs, starting in the centre and working
outwards (in sequence 1-10) to the 2nd stage
pre-torque.
15. Finally, angle tighten the main bearing bolts in
pairs, starting in the centre and working outwards
(in sequence 1-10) for the final stage torque. Use
the torque and angle method, refer to Fasteners
and Fixings, General, Introduction (PIL 72-00).
Important: If the parts have not been tightened to the
correct torque value within the maximum 15 minute
time period, then the parts must be separated,
thoroughly cleaned and fresh sealant applied.
After Installation
1. Check that the crankshaft can be freely rotated
by hand. Remove the bedplate lifting bolts T6.
2. Carry out the procedures listed, Before removal
in reverse order.
Table 48. Torque Table
Item Torque Value
1-10 (1st Stage) 50N·m
1-10 (2nd Stage) 115N·m

15 - Engine
09 - Bedplate
00 - General
15 - 55 9813/7400-1 15 - 55
Item Torque Value
1-10 (Final Stage) 180°
11 24N·m

15 - Engine
12 - Crankshaft
00 - General
15 - 59 9813/7400-1 15 - 59
Component Identification
Figure 119.
B
A
ACrankcase
BCrankshaft

15 - Engine
12 - Crankshaft
00 - General
15 - 60 9813/7400-1 15 - 60
Operation
Refer to Camshaft-Operation (PIL 15-15).
Lubrication
Oil is fed from the main gallery via five drillings, one
to each of the main bearings. A groove around the
diameter of the upper main bearing shell allows oil
transfer to cross drillings in the crankshaft to feed
each of the big end bearings. Crankshaft gear is
'splash' lubricated. Front and rear crankshaft oil seals
prevent oil leakage from, and dirt ingress to, the
engine.
Figure 120.
1Main gallery 2Drillings (x5)
3Main bearings 4Big end bearings
5Cross drillings 6Crankshaft gear
7Crankshaft oil seal 8Crankshaft oil seal

15 - Engine
12 - Crankshaft
00 - General
15 - 61 9813/7400-1 15 - 61
Check (Condition)
1. Check the main bearing surfaces for damage and
excessive wear.
Figure 121.
A
AMain bearing shells
2. Measure the crankshaft diameters to confirm
they are within service limits, refer to Technical
Data (PIL 15-12).
Figure 122.
B
BCrankshaft
3. Check that the oil-way cross drillings in the
crankshaft are clear and free from debris.
Blocked or restricted oil-ways will cause oil
starvation at the big end bearings.
4. Check that the piston cooling J-jets are clear. If
the J-jets cannot be cleared remove the fixing
screws. Remove theJ-jets and discard them.
5. Install new J-jets.
Figure 123.
D
C
CJ-jets
DFixing screws

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