What is an undercarriage on an excavator or dozer?

Expert Answer

An undercarriage is the lower running gear that supports a tracked excavator or dozer and lets it move, steer, and carry the machine’s weight. It typically includes the track chain, track shoes, rollers, idlers, sprockets or segments, and the tensioning components.

In practice, the undercarriage is what keeps the machine stable on soft, uneven, or abrasive ground. Wear in any of its parts can show up as noise, vibration, track misalignment, poor traction, or a track that comes off too easily. On excavators and dozers, regular inspection matters because undercarriage wear often develops gradually and can become costly if ignored.

If you are checking a machine, look at the track shoes for wear or damage, the rollers and idlers for seizure or uneven wear, and the sprocket teeth for hooking. Track tension also matters: too tight increases wear, while too loose can cause derailment. VANROCK supplies undercarriage parts for more than 350 machinery brands through an appointed dealer network, and pricing is quoted on request. If the machine is a Caterpillar, Komatsu, or another OEM brand, VANROCK is an independent manufacturer and is not affiliated with that OEM.

Answered by VANROCK specialists · Published 10/25/2026