Question about Porter Cable 7800 Drywall Sander With Dust Collection

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Replacing broken cable on Porter Cable 7800 sander

I am tring to replace the cable (which broke) on a Porter Cable 7800 & cannot get the head off. Any advice?

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Just have to take off the plastic flexible casing it is screwed to the head. then you can pull the old wire out, if it it broken take out the plastic bellow and the 2 screws that are underneath that. then u can pull the remain of the old[broke shatf wire. To unscrew the casing use a plier and hold the metal piece not the plastic or u will broke it. \ REMENBER THE CASING IS NOT THE VACUUM HOSE IS UNDER IT.

Posted on Sep 25, 2009

  • Edgar Rios Sep 25, 2009

    WHEN INSTALL THE NEW ONE, REGREASE AND INSERT IT.

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Posted on Jan 02, 2017

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1 Answer

Head bent heat up and disc work


Sounds to me like your sander is a fatality in the accident. Don't try to fix it as it is a disposable tool. You would run the risk of ruining any item you chose to sand. Balance is ever so important to a sander and the accident destroyed that balance!

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I am a long time owner of a porter cable 7800 drywall sander. I am experiencing a lot of deep swirl marks on my work.


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I guess you should clean the thing and replace a new disk or see how the disk is turning.

With frtiendly greetings from holland.

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Sounds like a problem with the ON/OFF switch. Hit it with a bit of contact cleaner or WD40 and work it a dozen or so times, it may just be dirty...... at least if you are lucky.
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The best way to sand drywall is to use a pole sander (manually). You can pick them up for about $20.

This particular machine tends to leave grooves in the drywall compound if you are not familiar with how to use it.

If you should have any questions about "Drywall Finishing/Patching", or know someone who does, put your questions to Category:"Tools- Building & Power- HAND TOOLS" at FixYa.com

Hope this helps,

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May 13, 2010 | Porter Cable 7800 Drywall Sander With Dust...

1 Answer

I have a porter cable 7800 sander, when i turned on the sander everything is spinning but the orbital part. i have changed the brushes and other minor things but dont have a clue how to open the orbital...


The best way to sand drywall is to use a pole sander (manually). You can pick them up for about $20.

This particular machine tends to leave grooves in the drywall compound if you are not familiar with how to use it.

If you should have any questions about "Drywall Finishing/Patching", or know someone who does, put your questions to Category:"Tools- Building & Power- HAND TOOLS" at FixYa.com

Thanks,

Jim

Mar 11, 2010 | Porter Cable 7800 Drywall Sander With Dust...

1 Answer

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Shane, it's not the sander that is the problem. This is a difficult machine to use, even for those who have been in the trade for years. The trick is to keep the head moving, and apply vary little pressure. Sorry I didn't find you sooner, but I just found this site 2 weeks ago.I'm sure you have already painted by now but your best bet would be to purchase a manual pole sander. If you have any other drywall questions, or know anyone who does, feel free to ask.

Jim

Apr 02, 2009 | Porter Cable 7800 Drywall Sander With Dust...

1 Answer

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the drive shaft is probably going bad. If all the greese is gone then it will cause it to heat up. you can find parts and diagrams to fix it at www.deltaportercable.com. search for modle number 7800 under the parts section.

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