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I just replaced the tensioning gear and the sprocket cover for this unit (which has a quick tensioner), which is only 3-4 years old (the first was defective; the second was worn, perhaps as a result of the first). Now when I'm cutting, I can see the darned wingnut slowly turning bit by bit and coming loose. The first couple of times I ran it with the new tensioner, the chain popped off; probably (I now think) because of the wingnut, which kind of freaked me out. After that I started watching it yesterday, I had to keep tightening it because it kept coming loose. Does this need to be replaced too? Has anyone ever had to replace one of these? I don't get it; I have a MS 270 that's more than 10 years old, and I've never had to replaced either the tensioner or the wingnut (or anything, for that matter).
Have never had a loose bar nut on my MS361. A mystery to me how that could happen to yours... I don't overtighten the nuts, but just snug them up.
Are the little teeth on the wing nut that engage the notches in the cover still there? That's what stops it from rotating.
Does this help?Never mind...need to figure out how to do a picture on this site.
Update: I replaced the wingut ($10) and now everything works fine. Hopefully no more part replacements for a while <knock on wood>==================I took a look and it all came back to me. The teeth aren't the issue. The part that you pull out to turn is loose; it should snap tight when you finish tightening the wing nut. That spring must be wornworn (why, I don't know). I now remember seeing that piece flapping around while I was cutting; I'd never seen that before. With the teeth disengaged from the notches, the entire wing nut is free to turn and come loose. Seems like I need a new wing nut now. I tell you, the quality of some of these parts seems really poor. This is my **third** tensioning gear; I still have the original on my 10 year-old 270. Sprocket cover. Now the wing nut. Engine runs great, though. And the saw always starts. Thanks again for helping me figure this out.Quote from: AKDoug on November 05, 2013, 01:08:39 PMDoes this help?Never mind...need to figure out how to do a picture on this site.
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