Komatsu Galeo PC27MR-2 Operation & Maintence Manual page 140

MACHINE OPERATIONS AND CONTROLS
Mechanism of rubber shoe coming off track
1) When traveling over an obstacle, a gap is formed between
the track roller and the rubber shoe. In this condition, the
rubber shoe may come off.
2) Furthermore, if the machine travels in reverse, a gap is
formed between the track roller, idler, and rubber shoe.
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 rubber
shoe will come off.
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OPERATION