Leaking Track Roller? Replace the Seal Early, Save the Assembly

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Short answer: A slight seep at the shaft end of any undercarriage part — track rollers, carrier rollers, idlers, final drives — is an early warning. Swap the seal and top up now for small money; wait until it wobbles, seizes or wears the track crooked, and you pay for assemblies, towing and labor many times over. A monthly walk-around catches it all.

Three spots to catch it early

Part	Early sign	Cost of waiting
Track / carrier rollers	Oily sludge at shaft ends, roller running hot	Worn-through, seized roller; track wears crooked
Idler	Tension cylinder greasing, uneven tread wear	Loose idler frame, failed tension
Final drive	Gear oil level dropping, breather weeping	Pitted teeth to broken teeth — assembly only

The seal-timing rule of thumb

Weeping (oily sludge) → schedule the fix, no downtime pressure;
Dripping (hits the ground) → change soon and top up the gear oil;
Oil gone + hot/noisy → the body is already damaged; talk assemblies.

Measurement-based replacement limits: undercarriage wear limits explained.

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Frequently asked questions

How much is a seal kit?

By roller type and model — send a photo plus the model for type and stock confirmation.

Can I do it myself?

Roller seals need pressing tools; most owners send it to a shop. We supply full seal kits and roller bodies.

How often to inspect undercarriage?

Monthly or every 250 hours — one walk-around lap catches sludge seeps early.

Got a part number or a photo?

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