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Small metal oil pump and worm gear kit for chainsaw

LAHDEK

LAHDEK Oil Pump Worm Gear Kit 2500 3800 25cc 38cc CO0448

SKU CH-DWB2-6SXNV

Oil pump worm gear kit fits 25 cc and 38 cc Chinese chainsaws including 2500 and 3800 models

  • Fits 25 cc and 38 cc Chinese chainsaw models 2500 and 3800
  • Complete kit includes oil pump and worm gear for full replacement
  • Genuine LAHDEK spare part numbered CO0448 ensures correct fit
  • Designed for two-stroke petrol chainsaws to restore lubrication
  • New condition guarantees unworn components for reliable performance

Oil Pump Worm Gear Kit for 25cc and 38cc Chainsaws

This replacement kit fits Chinese chainsaw models 2500 and 3800 with 25cc and 38cc two-stroke petrol engines. It restores the automatic lubrication system that keeps the guide bar and chain oiled during cutting. The kit is intended for owners and repair technicians servicing these specific displacement classes.

Mechanical drive with no external power draw

The worm gear is driven directly by the engine crankshaft, so it adds no electrical load and creates only the noise inherent to the saw’s normal operation. Proper mesh engagement maintains consistent oil flow without overheating the pump housing. Regular inspection prevents premature wear from debris or insufficient lubrication.

Compatibility limited to 2500 and 3800 model series

The kit includes one oil pump and one worm gear marked CO0448 for the listed models only. It will not fit chainsaws outside the 25cc and 38cc displacement range or other brands without verified cross-reference. Buyers needing parts for different engine sizes or pump designs must source the correct alternative.

Highlights

  • Fits 25 cc and 38 cc Chinese chainsaw models 2500 and 3800
  • Complete kit includes oil pump and worm gear for full replacement
  • Genuine LAHDEK spare part numbered CO0448 ensures correct fit
  • Designed for two-stroke petrol chainsaws to restore lubrication
  • New condition guarantees unworn components for reliable performance

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the oil pump worm gear kit on my 25cc chainsaw and what step is often missed?

Remove the clutch and sprocket to access the pump housing, fit the new worm gear onto the crankshaft drive slot, then mount the pump body — the step often missed is aligning the gear drive tang with the crankshaft slot before tightening the pump screws.

What maintenance will the worm gear and pump need after fitting?

Inspect the worm gear teeth for wear each time you sharpen the chain, clean sawdust from the pump inlet filter, and replace the gear if the teeth show rounding or the pump delivery drops noticeably.

What limit appears first when the saw runs long cuts with this kit?

The plastic worm gear on the 2500 and 3800 models is the first wear point; sustained high-RPM cutting generates heat that softens the gear, causing the drive tang to strip before the metal pump body fails.

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