Komatsu PC200-5

Track Roller / Bottom Roller / Lower Roller
What's the definition of track roller?
Track Roller also can be called Bottom Roller, Lower Roller, some people just called it roller, it's been used in a crawler machine like crawler excavator, crawler bulldozer.
So we gave the definition as below:

In a crawler machine, the small wheels that are under the track frame and that rest on the track chain.

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