Question about Dewalt DW421 5'' orbital sander

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What is happening to my Dewalt DW421 spinning fast, but no random orbiting motion.

The sander has been worked pretty hard and may be at the end of its life, but is there a replacement clutch or some other mechanism that could fail so the pad spins at about 20,000 rpm but no longer has the random orbital motion at all? Any suggestions would be appreciated. Thanks in advance for your help. Doug

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Need to replace the white circular flexible plastic part once you remove the black Velcro disk. A replacement came with my sander when purchased new. It had separate instructions indicating its a wear item and needs replacement if the sanding pad really speeds up when you lift it off the work piece. Also stated something about affecting its ability to capture dust.

Posted on Mar 09, 2019

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Probably need to replace bearing 6202. I took mine apart, dissambled the retainer and used PB Blaster on the bearing. It seems to be a short term fix. At least it's not operating at hyper speed anymore. Long term, I probably need to replace the bearing and maybe a new lower retainer if I can't press the bearing out.

Posted on Dec 13, 2015

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SOURCE: Dewalt 5

Seems time for a new sander.

Posted on Jul 30, 2009

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1 Answer

Sanding pad ripped off plate on DW421


You can get a new one fairly cheap. Toolpartsdirect.com there is different types to that model. Once you get it, they are not hard to change, 3 or 4 screws.

Sep 14, 2013 | Dewalt DW421 5'' orbital sander

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What type of sandpaper do I use on a dewalt dw421?


this sander appears to use the hook and loop system, you can download an instruction manual by going to dewaltservicenet.com and typing in your model number.

Jan 04, 2012 | Dewalt DW421 5'' orbital sander

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When I use the sander, the velco-like thing underneath the paper gets chewed up looking. It's 2 days old, so whats wrong??


When using this kind of sander you have to let the machine do the work, meaning if you press on it things like that happen, if you aren't doing that then possibly too thin and cheap sandpaper attached.

May 17, 2011 | Dewalt DW421 5'' orbital sander

1 Answer

Hi can I use my Dewalt polisher and change to sandpapper if so what parts will i need for instance glue new flexable pad sticky 220 papper can you please elaberate a little what in going to need thanx ...


I'm not sure I understand your question, but I'll give it a go.

The DW421 is a sander already. If you want to change it to a polisher, you can buy polishing pads to go on it.
If you have a Dewalt polisher and want to convert to a sander, you can buy sanding disks to fit your polisher. They are installed on the spindle and I believe you can get a backing pad for it also.

Hope that helps

Mar 19, 2011 | Dewalt DW421 5'' orbital sander

1 Answer

I dropped the sander and now it no longer works.


What do you expect?
Probably mostly plastic & cheap
See if Home Depot will take back

Dec 29, 2010 | Dewalt DW421 5'' orbital sander

1 Answer

I have a Dewalt sander I am using for wet sanding on a boat hull. I have already burned one sander out do to moisture I figure is there a way to protect the new sander from this happening again I am...


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Dec 17, 2010 | Dewalt DW421 5'' orbital sander

1 Answer

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I think your model holds the paper with glue that is on the sand paper.Just take apart the back cover of the sand paper to expose the glue.

Nov 08, 2010 | Dewalt DW421 5'' orbital sander

2 Answers

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I have the same problem with a Porter Cable orbital sander I recently purchased. Whats happening is the sander is catching the edge of the board you're trying to sand and jerking back and forth as the sander base spins. It seems that if the board your're sanding is at least as wide as the sander base, the problem goes away, which does little good because there will be many times I we'll need to sand wood that is less in size. But you may try using a lesser grit sandpaper and see if that alleviates the problem somewhat.

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1 Answer

Break


dewalt has a web sit where they answer your questions

Dec 06, 2008 | Dewalt DW421 5'' orbital sander

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