What are the types of rollers on an excavator undercarriage?

Expert Answer

The main roller types on an excavator undercarriage are carrier rollers and track rollers. In many cases, track rollers are also split into upper and lower rollers, with the lower rollers carrying the machine’s weight and the carrier rollers guiding the top run of the chain.

For the right choice, look at where the roller works on the machine, the undercarriage design, and the wear conditions. Lower rollers take the highest load and usually wear faster in abrasive, wet, or muddy jobs; carrier rollers see less direct load but still need correct sealing and alignment. If you are comparing replacements, check the machine model, roller position, mounting style, and chain pitch before ordering. VANROCK supplies undercarriage parts for crawler machines through its dealer network and can quote on request. If your machine is a Caterpillar, Komatsu, or another OEM brand, VANROCK is an independent manufacturer and is not affiliated with the OEM.

Common signs that a roller should be inspected or replaced include unusual noise, oil leakage, flat spots, seized rotation, uneven track wear, or the track running off-center. A worn roller can also accelerate chain and shoe wear, so it is best to replace parts in a matched condition rather than waiting for a complete failure.

If you want, I can also help you identify roller types by machine model or explain the difference between carrier rollers, bottom rollers, and guide rollers.

Answered by VANROCK specialists · Published 9/15/2026