13 - 2
Removal and Replacement
!!
WARNING
You can be injured if you do not wear the proper
clothing. Loose clothing can get caught in the
machinery. Wear protective clothing to suit the job.
Examples of protective clothing are: a hard hat, safety
shoes, safety glasses, a well fitting overall, ear-
protectors and industrial gloves. Keep cuffs fastened. Do
not wear a necktie or scarf. Keep long hair restrained.
INT-1-3-6
The removal of the drive motors can be divided into two
sections: removal of the motors themselves and removal of
the drive sprockets and chains.
Removal of the Drive Sprocket
On machines up to serial number 751817, remove the
roadwheels (see page F/1 - 1).
Remove the front floorplates (see page B/1 - 1). From the
inside of the chassis, remove bolts 1 (6 off) and washers 2 (6
off). Take off cover 3, remove and discard gasket 4. Turn
both stub axles until the drive chains are at their slackest
(see page F/1 - 2).
On machines up to serial number 751817, remove bolts 5
and withdraw spider 6. Draw out sprocket 7, then remove
and discard oil seal 8. Examine the condition of bearing 9.
Do not remove it unless it is to be renewed.
On machines from serial number 751818 the spider
assembly is no longer fitted, the sprocket being splined
directly onto the motor shaft.
Removal of Motor
The left hand illustration shows the motor installation up to
machine number 751011. The right hand illustration shows
machines from serial number 751012
On machines up to serial number 751817, remove the drive
sprocket as previously described.
On machines from serial number 751818 the sprocket is
splined directly onto the motor shaft therefore it is not
necessary to remove the sprocket or disturb the hubs and
chains.
Remove the motor cover. Disconnect the hydraulic hoses A
from the motor. Plug exposed connections. Withdraw
capscrews B (4 off). The motors can now be lifted clear.
Replacement
Replacement is the reversal of the removal procedure.
Note: The motors fitted from machine number 751012 are
constructed differently for left and right hand operation and
this is indicated on the serial number plate. Due to the
installation on this machine the actual position may be
opposite to that indicated on the motor, i.e. a motor marked
for left hand operation would be fitted to the right hand side
of the machine and vice versa. However on machines built
around May 1997 onwards the motors are correctly marked.
Refer to the parts catalogue for the correct motor.
Renew all seals and 'O' rings.
Apply JCB Threadlocker and Sealer to bolts 5 before fitting.
Apply JCB High Strength Retainer to capscrews B before
fitting.
Note: On machines after serial number 751476 capscrews B
are increased in size to M12. Earlier machines may be fitted
with the larger capscrews if required, see Technical
Information Bulletin 1/008.
On machines after serial number 751818 capscrews B are
further increased in size to M14. These have since been
changed to M14 setscrews with hardened plain washers and
no spring washer. The setscrews and hardened washers
may be fitted as complete sets to earlier machines in place
of the M14 cap screws, plain and spring washers.
On machines up to serial number 751817, adjust the drive
chain tension (see Section 3 - Routine Servicing) before
fitting motor cover 3.
Torque Settings
Item Nm lbf ft kgf m
1 Bolts M8 x 16 (6 off) 28 21 2.9
5 Cap screw M10 x 100 (3 off) 56 42 5.8
A Hydraulic Connections 44-50 33-37 4.6-5.1
B Cap screw M10 x 30 (8 off) 56 42 5.8
B Cap screw M12 x 30 (8 off) 98 72 10
B Cap screw M14 x 35 (8 off) 220 162 22.4
B Setscrew M14 x 35 (8 off) 220 162 22.4
Section E Hydraulics
9803/8550
Section E
13 - 2
Issue 6*
Drive Motors
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