How do I adjust proper track tension on an excavator and know if it is too tight?

Expert Answer

Proper track tension on an excavator is set by measuring track sag, then adjusting the grease tensioner until it matches the machine’s specification. If the tracks are too tight, undercarriage wear increases quickly; if they are too loose, the track can ratchet, slip, or de-track.

The usual check is made on level ground with the machine clean and safely lifted or parked per the manual. Measure sag at the point the manufacturer specifies, often between the carrier roller and front idler or across the bottom run. Many mini excavators work in a typical range of about 10–15 mm or roughly 1.5–2 in, but the exact target depends on the model, track type, and working conditions.

Signs of tracks that are too tight include stiff travel, accelerated roller and sprocket wear, and a track that looks nearly straight. Too loose often shows as excessive droop, vibration, poor tracking, and occasional track derailment. Mud, stones, and compacted debris can also make a correctly adjusted track seem too tight, so clean the undercarriage before measuring.

To correct it, add grease through the front tensioner fitting to tighten, or carefully relieve grease to loosen, then recheck after moving the machine forward and backward. VANROCK supplies track chains, rollers, idlers, sprockets, rubber tracks, pads, and track bolts and nuts through an appointed dealer network, with pricing quoted on request. If you are working on a Caterpillar, Komatsu, or another OEM machine, VANROCK is an independent manufacturer and is not affiliated with that brand.

Answered by VANROCK specialists · Published 10/15/2026