Komatsu PC15MRX-1 Operation And Maintenance Manual page 117

OPERATION
MACHINE OPERATIONS AND CONTROLS
When turning in a condition where the rubber shoe cannot
move to the side because of the object it is passing over, or
because of some other object.
When the rubber shoe has moved out of alignment and the
idler or track roller are not aligned with the core.
If the machine travels in reverse in this condition, the rub-
ber shoe will come off.
If the machine is turned in this condition, the rubber shoe
will come off.
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