Question about Porter Cable 332K Quicksand Random Orbit Sander W/ Case

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Porter Cable Random Orbital Sander rotates but does not "orbit"

My Porter Cable Random Orbital Sander model 333 pad rotates at a high speed but does not appear to randomly "orbit". This results in immediate circular scarring on the surface to be sanded.

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  • fretdancer May 25, 2009

    I read the above answer but there is no part listed as an oscillating bearing in the schematic. The problem started when the rubber belt broke so I replaced it but the diagram shows it slipping over a pulley which is actually just a flange that is screwed down and does not rotate. This does not seem to restore the randomness of the pattern

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Just solved my problem with Porter Cable 333 orbital sander which just groaned. I thought the worst. I carefully took it apart on the garage floor and immediately suspected it needed lubrication as the motor turned hard. I used my flexible long plastic tube lubrication and put some on the bottom bearing shaft the best I could. I worked it around and around. I began to feel it turning easier. I applied more oil and kept moving and it became completely free. I put a drop on the top bearing even though it was loose. I put it all back together and it works like new. Lesson: do not look for the worst when a tool quits. Suspect the culprit to be lack of lubrication!!!

Posted on Aug 15, 2011

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It is likely that the oscillating bearing is frozen.

Posted on May 20, 2009

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