Question about Dewalt DW421 5'' orbital sander
Check the comutator (where the brushes contact on the shaft) and make sure it is clean and not shorted
Posted on Jul 26, 2009
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Posted on Jan 02, 2017
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Nov 09, 2015 | Sander Tools & Hardware - Others
Dec 22, 2014 | Sander Tools & Hardware - Others
It sounds to me that you have used the sander a lot and the vibration has broken a wire or it's about to break on the field windings. The brushes you need to look at to see if worn. But I kind of think wire problem. I had this happen on mine and opened it up to find this is what happened. The sander would be turned on and would not operate until I turn upside down and it would work. This is great if you are sanding upside down but this is just a sign that you are on borrowed time as this will eventually not turn on at all. I was able to fix mine with new wire crimp connection and solder with heat shrink material. If not you can order new field winding if this is what is wrong. Cleaning up the sander won't hurt either. You might want to see what a new sander will cost vs. part. Good Luck!
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