Porter Cable 7800 Sander Problem

kentmarcus

Our Porter Cable 7800 Sander has developed a vibration at the head. It sounds like something is rubbing (once per revolution) at the pad, but as far as we can see nothing is rubbing.

I'm thinking something is bent (shaft, spindle, etc.), but I have no idea if this is even possible

Any ideas on how to pinpoint the part(s) required to get this sander going smoothly again.

Drywaller

It may be your drive shaft starting to give out or break.Take it apart and look at the shaft,Ive rebuilt my sander 3 times and is not that hard to do.

joepro0000

Any online tutorials?