jcb 1CX, Service Manual

Page: 46 / 242

9 - 2
Section 3 Routine Maintenance
9803/8550
Section 3
9 - 2
Issue 2*
Transmission (cont'd)
Adjusting the Drive Chain Tension
Note: The drive chains on machines after serial no. 751600
are pre-tensioned during manufacture and there is no
provision for routine adjustment in service. These machines
are fitted with a different style hub as shown at Y. Refer to
Wheel Hub Assembly Removal and Replacement
(SECTION F) for initial setting procedure.
1 Park the machine on firm level ground.
2 Stop the engine and remove the starter key.
3 Jack-up the left side of the machine, positioning the
jack under the centre of the chain case between the
wheels. Support the machine on blocks.
Note: Ensure that the jack is capable of lifting at least 3000
kg (3 tons).
4 Remove the rear wheel.
5 Adjust the tension as described below:
a Loosen the six bolts B securing the hub locking
ring C.
b Using a large adjustable spanner grip the lug on
hub D, then rotate the hub until no further
movement is possible. Mark this position as
shown at X.
c Slacken the tension with the adjustable spanner
until the mark on the hub is 3.5 to 4.0 mm back
from that on the locking ring as shown.
d Re-tighten the six bolts of hub locking ring C to
a torque of 98 Nm (72 lbf ft,10 kgf m).
6 Refit the rear wheel, tightening the bolts to the correct
torque (see page 3/9 - 3).
7 Repeat steps 3 to 6 for the front wheel.
8 Repeat steps 3 to 7 on the right side of the machine.
203920
B
C
D
X
3.5 - 4 mm
S256270
Y
*
*
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