OPERATOR'S MANUAL MAINTENANCE

Section 3 - Maintenance
Routine Maintenance
Tracks and Running Gear
3-93 3-93
9803/JSM-0412
Tracks and Running Gear
Tracks
Checking/Adjusting the Track Tension
1 Prepare the Machine.
K Prepare the Machine for
Maintenance ( T 3-29).
Position the machine on level ground. Run it
backwards and forwards several times. Stop after
running it forwards.
Carry out steps 1 to 3 of Cleaning the Tracks. Block
up the undercarriage frame. Finish track rotation by
running the track forwards. Stop the engine and
remove the starter key
!MWARNING
Raised Machine
NEVER position yourself or any part of your body
under a raised machine which is not properly
supported. If the machine moves unexpectedly you
could become trapped and suffer serious injury or be
killed.
INT-3-3-7_1
2 Check the Tension.
Measure gap A in line with the third roller from the
front and between the lower surface of the track frame
and the upper surface of the shoe.
Table 26.
3 Adjust the Track Tension.
Adjustment is made by either injecting or releasing
grease from the check valve B. Inject grease to
reduce the gap (increase the tension) or open the
check valve to release grease and increase the gap.
When closing the check valve torque tighten to
60Nm.
!MWARNING
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.
8-3-4-5
!MWARNING
Under no circumstances must the check valve be
dismantled or any attempt made to remove the grease
nipple from the check valve.
8-3-4-9
If a gap C exists between the idler wheel shaft and
the track frame, you may use pressure to apply the
grease. If there is no gap C after the application of
grease, then the necessary repairs must be carried
out by your JCB distributor.
Fig 72.
Note: Excessive tension can cause the track rail to wear
the drive rollers and sprocket, insufficient tension can
cause wear to the drive sprocket and track rail.
Machine Dimension A (Hard Ground
Conditions)
JS130-JS160 235-255mm
JS180-JS260 275-295mm
JS290-JS460 340-360mm