I have a Poulan chainsaw, model no. PP4620AVX. I removed the clutch cover and now I can't get it back on. The circular section which has some type of metal band appears to be the problem. When I try to put the cover back in, something is stopping it from going in correctly. What can I do to fix what seems like a minor problem, Thanks.

The cover looks easy, but it is a special fit problem. There is a screw device with a very small pip which fits into the chain bar on the side. When you put the chain and bar on together, you have to adjust this BACK toward the sprocket with a flat screw driver. Now you can fit the bar and chain in with the chain around the sprocket and very loose. Place the cover on after visually seeing a passage for the chain oil from the angled plate - through some slots in the side, though the side hole in the bar, and up through that invisible inside drilled hole between the chain groove and the bar side hole. Move the cover back and forth before tightening. Ensure that the screw pip device is snapped into the bar so that you can move the bar forwards and back using the flat screw driver. Now tighten to less than hand tight. Adjust the bar forward so you can just see three bottom guide teeth in the chain when you pull on the middle of the chain from the bottom of the bar. Now you have the right tension on all those sharp links and you can give the cover bolts a good tightening, not to crack the plastic or metal though. Be sure to clean all the dust out of the band area with a tooth brush as this can lock up the band and not let the chain revolve at all - making it act as if the chain brake is on. Also be aware of the tiny roll/spring pin in there which wants to fly out when cleaning. It controls how the band works when you trip the chain brake.