Komatsu PC118MR-8 Operation And Maintenance Manual page 316

MAINTENANCE PROCEDURES
How increase the track tension
Prepare a grease pump.
1. Inject grease with the pump through the grease nipple (5).
2. To make sure that the tension is correct, run the engine at
idling speed, move the machine slowly forward covering a
distance equal to the length of the track on the ground,
then stop the machine.
3. Check the track tension again. If it is not correct, adjust it
again.
4. Keep injecting grease until the distance S becomes equal
to zero (0). If the tension is still insufficient, the pins and
bushings are excessively worn, so they must be swapped
or replaced. Contact your Komatsu distributor, who will
carry out the necessary operations.
How decrease the track tension
q It is extremely dangerous to let the grease out following any procedure different from those illustrated
below.
q If the track tension cannot be reduced with this operation, contact your Komatsu distributor, who will
provide for the necessary repairs.
1. Gradually loosen the grease valve (4) to let the grease out;
do not give the valve more than one turn. If the grease
does not come out smoothly, move the machine slowly
forward and backward covering a short distance.
2. Tighten the grease valve (4) and remove any trace of
grease.
3. To make sure that the tension is correct, run the engine at
idling speed, move the machine slowly forward covering a
distance equal to the length of the track on the ground,
then stop the machine.
4. Check the track tension again. If it is not correct, adjust it
again.
NOTICE
q The pins and bushings wear out to different degrees, depending on the work conditions and on the
characteristics of the surface on which the machine is working. It is therefore necessary to check the
track tension frequently, in order to ensure that it is always correct.
q When working on rocky or very irregular surfaces, increase the track tension in order to prevent
stones or debris to get stuck between the tracks and the sprocket; on the other hand, reduce the track
tension when working on soft or muddy ground, since the soil penetrates between rollers and tracks
and tends to increase the tension.
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DANGER
WEAM014802
MAINTENANCE