Do new sprockets need new bushings?

Recommended: new sprocket on stretched bushings wears fast.

Undercarriage Wear Limits: When to Replace Rollers, Idlers and Sprockets

Q: How long do undercarriage parts last?

Typically 2,000–5,000 hours in mixed conditions; abrasive conditions halve it.

Q: Can I replace just the leaking roller?

Yes, immediately — and budget the neighboring worn ones.

Home › Knowledge Base › Undercarriage Wear Limits

Short answer: Replace undercarriage parts by measurement, not by looks. Common field limits: track rollers at 75–80% of original flange diameter, sprocket teeth pointed or one-sided, idler tread worn into a step. A new part running against heavily worn neighbors wears out fast — replace in matched groups (per side) whenever the budget allows.

Wear checkpoints by part

Part	What to check	Replace when
Track rollers	Flange diameter, tread surface, oil seepage at shaft ends	Near minimum diameter, flat-spotted tread, or leaking
Carrier rollers (top)	Tread groove and flanges	Deep groove or wobble on the shaft
Idler	Tread step, seal leakage, tension system	Stepped tread or side-to-side looseness
Sprocket	Tooth profile	Teeth pointed / hooked, or one-sided wear
Track links & bushings	Link height, pin/bushing play, pitch stretch	Pitch beyond spec — links and bushings together

Why matched sets matter

A new sprocket chewing on stretched bushings wears fast; new links on a worn sprocket clatter and skip. The same logic applies to rollers: one new roller between worn ones takes uneven load. Plan replacements in groups: (sprocket + bushings), (rollers per side), (idler + tension parts).

Make undercarriage last longer

Keep track tension to spec — sag per manual; overtightening multiplies bushing wear.
Clean packed mud off rollers daily; dried mud grinds seals.
Alternate working direction; one-direction work wears flanges one-sided.
Leaking roller? Replace it now — it protects the shaft and the neighbors.

Rollers, idlers, sprockets, links and bolts for CAT, Volvo, Komatsu and Hitachi — all searchable in All Parts.

Frequently asked questions

How long do undercarriage parts last?

Typically 2,000–5,000 hours in mixed conditions; abrasive rock and sand can halve it.

Can I replace just the leaking roller?

Yes — replace leaking ones immediately, and plan the neighboring worn ones with your budget.

Do new sprockets require new bushings?

Strongly recommended: a new sprocket on stretched bushings wears quickly and noisily.

Need undercarriage parts?

Send the part number or machine model — same-day quote, factory direct.

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