jcb JS 200 Series, Service Manual

Page: 466 / 531

6 - 5
Replacement (continued)
5 Apply grease through the check valve to adjust the
track tension
(see Tracks and Running Gear,
Checking/Adjusting the Track Tension , Section 3).
Motor Bleeding
Bleeding must be done whenever a track motor is being
fitted.
Note: If a track gearbox assembly is being fitted to the
machine with the motor attached, follow the procedure given
under
Track Gearbox Removal and Replacement .
When the motor is being fitted to a gearbox already fitted to
the machine, bleed the air from the motor by one of the three
methods detailed below.
Note: Method 1 will take considerable time as air in the
motor is very difficult to purge. Methods 2 or 3 may be
quicker.
Method 1
After fitting the motor but before connecting the pipework,
remove plug from upper drain port
A but make sure that a
plug is fitted to lower drain port B .
Fill the motor with specified hydraulic oil through port A .
Connect the pipes.
Method 2
Fit the motor and connect all pipes except the two drains.
Remove plug from port
A . Make sure that a steel plug is
fitted to bottom drain port
B
.
Run the engine and operate the track control lever slightly so
that the sprocket does not turn. If necessary, prevent the
sprocket from turning by means of a steel bar or tube
jammed in the track. Return the lever to neutral when air-
free oil flows from port
A . Connect the drain pipes.
Method 3
Fit the motor and connect all pipes. Prevent the sprocket
from turning by means of a steel bar or tube jammed in the
track. Run the engine and fully select the track control lever
for about 1 minute. This will fill the motor case with oil.
Section F
Transmission
9803/6400
Section F
6 - 5
Issue 2*
Motor/Gearbox
*