I have 4 PC333s. One of them has started jerking and jumping around. I
have read that the common problem is a small belt breaking, so I pulled the
bottom off and found the belt was fine.
However, the little pulley it goes around was seized. I removed it, cleaned
it, and lubed it. It turns now. (I just wish I had understood it screwed
the wrong direction before I stripped the threads out.)
The sander is about 50% better, but still not right. Any ideas?
I know that my PC sanders do not run well and vibrate a lot if they do no
run at full operating speed. If the pulley is slipping it can throw
everything out of harmonic balance.
And remember, it did not screw in the wrong direction, you did. Almost
always threads loosen in the same direction that they spin when operating.
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