What are the parts of an excavator or dozer undercarriage?

Expert Answer

An undercarriage is the tracked running system that supports and moves an excavator or dozer. The main parts are track chains, track shoes, rollers, idlers, sprockets, and the track tension components that keep the chain aligned and tight enough to run correctly.

In practical terms, the track chain carries the machine, the shoes give ground contact, rollers support the weight, idlers guide the chain at the front, and sprockets drive it from the final drive. Track adjusters, recoil springs, seals, bolts, nuts, and guards are also part of the complete system. Wear usually shows up as loose tracks, uneven roller wear, broken shoes, cracked links, or noise from the front idler or sprocket area.

For VANROCK, these are the core undercarriage families we manufacture and supply for 350+ machinery brands: track chains, track shoes, track/carrier rollers, idlers, sprockets/segments, rubber tracks, rubber pads, and track bolts and nuts. If you are diagnosing wear or planning a replacement, start by checking the machine model, chain pitch, shoe width, and any part numbers on the existing components. VANROCK sells exclusively through an appointed dealer network, and exact fitment and pricing are quoted on request. If your machine is a Caterpillar, Komatsu, or another OEM brand, VANROCK is an independent manufacturer and not affiliated with that OEM.

Answered by VANROCK specialists · Published 9/26/2026