The vanes in the small air motor are stuck
try a small amount ( couple of drops ) of sewing machine oil in the air inlet and see it it will spin
you may need to bump the pad on the bench to jar the shaft to start rotating
SOURCE: no sanding action and motor just buzzes
It will probably be the shaft from the motor to the orbital cam which is on the flat plate that you connect the sandpaper to , either the shaft or the bottom cam is broken [probably the shaft has snapped ] you can do a cheap repair with a good glue to reconnect the shaft [but you wont be able to push too hard again] or if you can get the parts just replace the shaft into the motor . they are really simple things to work on
SOURCE: Dewalt DW433 belt sander stop working, why?
Check the brushes for the motor they may have gone bad or broken, I have seen this happen before on dewalt tools.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
SOURCE: I use Dewalt random orbital sanders regularly
The velcro pads wear out and need to be replaced periodically. You can buy new pads on-line at any Dewalt parts seller.
Testimonial: "Thanks much,. I suspected that that was the case but have been unable to find the replacement part. I'll try again."
SOURCE: dewalt d26451 type 1 random orbital sander. why
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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Had the same problem on air ratchet could it be from moisture in tank noticed there was some and looked like rust
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