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

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Excessive vibration Model 330 - Porter Cable Porter-Cable Speed-Bloc Quarter-Sheet Finishing Sander 330

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Hello. When you have excessive vibration you have to replace the four small rubber posts that insulate the upper housing from the vibration of the pad. These are available at portercable.com

Posted on Oct 04, 2010

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What causes excessive vibration in 11.5 HP Swisher Trailcutter after hitting a stump?


The most likely cause is a bent blade. If the blades are not reasonably straight and balanced it will cause excessive vibration. I suggest addressing this asap. The excess vibration can cause more serious problems if not fixed.

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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.

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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?


Not sure if this will work for you, but I had the same problem with my 330, it vibrated so much it felt like I was being electrocuted. I took the four screws holding the pad off and blew compressed air inside the sander to remove all the sawdust. Screwed the pad back on and now it works fine. Mine was only 5 years old with very little use.

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1 Answer

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Check the Vibration damper rods to be sure that...
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2. If they are broken in 1/2.
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Also - there are suspension springs on the bottom of the tub that could be broken and/or missing.

Replace/repair as necessary.

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Remove the 4 sander plate screws being carefull not to strip them. Look at the plastic ******** extentions attached/flooting to the houseing and look for broken or bent arms on them ,replace with new ones, this should solve your problem.

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