Question about Porter Cable Porter-Cable Speed-Bloc Quarter-Sheet Finishing Sander 330

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Extreme Vibration in my Porter Cable (Rockwell) 330 Sander

My 330 finishing sander hasn't been used in a few years. When I tried to use it it vibrated so much that I could barely hold on to it. Is there a simple fix or is it shot?

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I also have had this problem and I found that if I hold the unit tightly and squeeze the plastic housing the RPM's will stabilize as the unit warms up. Best fix is to replace the rubber isolators that prevent vibrations from the motor from reaching the plastic housing. The isolators have become hard through age or very cold temperatures.
I read somewhere that keeping the sander stored in a warm room can also help because when the rubber is very cold it becomes hard.

Posted on Dec 26, 2009

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I have the same issue on my 330 sander but can't figure out how to take off the exterior housing to get to the screws holding the 4 rubber posts on. Can anyone offer some insight?

Posted on Apr 01, 2017

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I had the same problem. solution below worked.
WD 40 into the bearings, blow it out w/ compressed air, then bearing lube (spray)

Posted on Jun 02, 2013

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Eso esta ocuriendo por un desbalance ,tienes que abrirla y tratar de balancearla , esto regularmente ocurre por la rotura de una goma que se encarga de disimular esta vibracion , solo debes remplasarla.

Posted on Apr 15, 2011

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Posted on Jan 02, 2017

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I inherited this sander (Porter-Cable model 330) and the owners manual did not come with it. I am stumped as to how and get the side levers to lift so that i can change the sandpaper (non-stick paper)....


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I HAVE A PORTER CABLE 330 SANDER, IT VIBRATES SO MUCH IT IS UNCOMFOORTABLE TO HOLD. IF I REPLACE THE RUBBER POSTS WILL THIS SOLVE THE PROBLEM? IS IT SOMETHING ELSE?


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