Komatsu PC78US-6 Operation & Maintenance Manual page 216

MAINTENANCE PROCEDURE
REPLACE RUBBER SHOES
Carry out this operation with two workers. The operator must move the
machine in accordance with the signals from the other worker.
The rubber shoes are replaced with the machine raised, so it is
extremely dangerous if the machine is lowered by mistake during the
replacement operation. During the replacement operation, never move
the rubber shoe track except the rubber shoe track to be replaced.
In addition, never go under or put any part of your body under the rubber
shoe or track frame during the replacement operation.
To check that the track tension is correct, run the engine at low idling,
move the machine forward a distance equal to the length of track on
ground, then stop the machine.
NOTICE
It is possible to change from the rubber shoe to the road liner and steel shoe. However, it is necessary to remove the idler guard
and to carry out adjustment, so always contact your Komatsu distributor to have the replacement carried out.
It is extremely dangerous to release the grease by any method except the procedure given below.
If the rubber shoe tension is not relieved by this procedure, please contact your Komatsu distributor for repairs.
Check that all the grease has been released before rotating the sprocket to remove the rubber shoe.
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MAINTENANCE