20 Most Recent Dewalt DW421 5'' orbital sander Questions & Answers


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.

Dewalt DW421 5''... | Answered on Mar 09, 2019


You will either have to get a removal tool to take it out or drill/cut it out carefully.

Dewalt DW421 5''... | Answered on Feb 23, 2016


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.

Dewalt DW421 5''... | Answered on May 25, 2014


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.

Dewalt DW421 5''... | Answered on Jan 12, 2012


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.

Dewalt DW421 5''... | Answered on May 19, 2011


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

Dewalt DW421 5''... | Answered on Mar 20, 2011


could be but I would think more that there is a bearing that is rough/tight causing, sounds like time for a thorough cleaning. Unplug tool and can you more the motor/pad freely, you will get some resistance but it should turn. If not then I would look to replace them.

Dewalt DW421 5''... | Answered on Feb 12, 2011


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

Dewalt DW421 5''... | Answered on Dec 30, 2010


Impossible not to get water in the bearings and motor. It is vibrating too fast. You need air sander. Or sand dry, then wet sand the primer by hand.

Dewalt DW421 5''... | Answered on Dec 17, 2010

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