Chainsaw Repair

There's two different oil pump drives on these. The change point was Dec 96.

I only have the later one. On this one, there is a recess counter bore in the end of the clutch drum under the rim gear drive. This part of the clutch drum extends over a small spacer the diameter of the needle bearing so the drum can extend back to drive the nylon worm gear for the oil pump. You can see a corresponding recess in the plastic worm gear almost like an imprint of the end of the clutch drum showing the teeth of the hub.

There is another older clutch drum with no recess and there is a spacer and big finder washer between the oil pump worm gear and the clutch bell

This pdf image is from 2004. The top illustration is of the new 3 shoe clutch but in it you can see the new style worm gear drive that was used on all three clutches from December 96 on . . .

The bottom of the image shows the old style clutch drive.

The older system is a full time oil pump drive and the newer system only pumps oil when the clutch is engaged and the chain is turning. I've had several chainsaws with full time oil pumps and they are just fine and not noticeable unless you just let the chainsaw set there and idle a long time.

This has nothing to do with which style spider you are running.