Komatsu PC118MR-8, Operation And Maintenance Manual

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MAINTENANCE PROCEDURES
MAINTENANCE
4-28
SHOE FIXING SCREWS CHECK AND TIGHTENING 4
WARNING
q
To compensate for the inevitable settling movements,
it is indispensable to check the tightening torque of
the screws (1) after the first 30 hours of operation.

Carry out another check after the first 100 hours of
running-in and, if the screws have become loose
again, repeat the check after 200 hours of operation.
q
If the screws (1) become loose and are not tightened at
the required torque, the useful life of the tracks will be
shorter.
q
After tightening, make sure that the nut and the track
are in contact with the surface of the link.
The check must be carried out with the machine parked on
level ground.
How to tighten the steel tracks
Tighten the screws with an initial torque of 196±19.6 Nm (20±2
kgm), making sure that the nut and the track are in contact with
the surface of the link. Then give an additional turn of 90° ±
10°.
How to tighten the road liners
Tighten the screws with a torque of 196±19.6 Nm (20±2 kgm),
making sure that the nut and the track are in contact with the
surface of the link. Then give an additional turn of 60° ± 10°.
Tightening sequence
The screw tightening sequence for each element must be 1-2-
3-4, as shown in the figure.

After tightening, make sure that the nut and the track are in
contact with the surface of the link.
WEAM014802