How often should an excavator undercarriage be inspected?

Daily for leaks, missing bolts and obvious tension changes; weekly for measured track tension, sprocket tooth profile and packing material; monthly for measured wear data (roller OD, idler rim, sprocket tooth thickness, chain pitch).

What is the first sign of a failing track roller?

Oil or grease weeping at the roller end. That means the seal has failed and grit is entering the bearing — it precedes visible tread wear.

Should I record undercarriage measurements?

Yes. Recording roller diameter, idler rim, sprocket tooth thickness and chain pitch monthly turns 'it looks worn' into a trend, so you can order before a failure rather than after.

What causes a rhythmic clunk when turning an excavator?

Usually a worn chain or a failing final drive, not a minor noise. It is worth investigating before it becomes a breakdown.

Undercarriage & wear parts

Undercarriage maintenance checklist

An undercarriage that is inspected on a schedule lasts longer than one maintained only when something breaks. This is the checklist we would run, in the order that catches the expensive failures first.

Daily / every shift (5 minutes)

Walk around the tracks. Look for oil or grease weeping at roller and idler ends — that is a failed seal, and it precedes bearing failure.
Listen. A rhythmic clunk when turning is a worn chain or a failing final drive, not a minor noise.
Check for missing pad bolts. One missing bolt means the rest on that pad are loaded unevenly.
Visual track tension. Sag noticeably different from yesterday means something changed.

Weekly (20 minutes)

Measure track tension properly. On level ground, midway between sprocket and idler, with the track lifted slightly. Compare with the manual figure for your model.
Check sprocket tooth profile. Run a hand over the teeth — hooking is obvious by touch before it is obvious by eye.
Inspect for packing material. Mud or rock packed between sprocket and idler makes the chain read loose when it is not.
Look at pad grouser height against a new pad.

Monthly (1 hour)

Measure and record. Roller outer diameter, idler rim diameter, sprocket tooth section thickness, chain pitch. Recording the numbers is what turns "it looks worn" into a trend you can act on.
Check bolt torque on track pads to the manual figure, in a crossing pattern.
Inspect the track frame for cracks, especially around mounting points.
Check final drive oil level and look for metal in the oil.

What to record (this is the part people skip)

For each machine, keep a simple sheet: date, roller OD, idler rim dia, sprocket tooth thickness, chain pitch, plus any photos. Six months of that data tells you exactly when to order — before a failure, and with time to get the right part.

The failures this checklist catches early

Seal failure — caught by daily greas spotting, before the bearing goes
Sprocket hooking — caught weekly, before it takes the chain with it
Chain stretch — caught by monthly pitch measurement, before it cannot be tensioned
Frame cracks — caught monthly, before a component fails for a reason you did not see

What we supply

Bucket teeth and adapters, track rollers, idlers, sprockets, track shoes and chains, cutting edges. We confirm fitment against your serial number and casting mark before quoting: alfrun@gmail.com

Before you order

Send machine make, model, serial number and a photo of the casting mark. We confirm the part number and fitment basis before any price discussion.

Send part details

Confirming the part before you order

Measurements get you close. A serial number and a photograph of the casting mark confirm it. Here is exactly what we need, and why each item matters:

What we need to confirm a part

Trademark notice

Machine brand names and part numbers are used only to describe fitment and application. We are not an authorised dealer of any machine manufacturer.

Reviewed by Zhonglei M&E parts desk — export trading partner for undercarriage and wear parts. Last updated 2026-11-13.