4" belt sander noise

[Dan Milosch]

My Delta belt sander is noisy and makes a clunking or grinding noise when I turn it off. The noise seems to come from around the motor roller. Any thoughts? Bearing, maybe? If so, how do I fix it?
-Dan

[Richard Coers]

Take off the drive belt and then turn on the motor. Next, spin the belt by hand and see how it moves. Clunking is never a bearing unless it's fallen out,

[Dan Milosch]

Thanks, I'll try that.

[Sebastien La Madeleine]

Clunking noise when the motor spins down is often the centrifugal switch relatching for your next start, it should not “grind” but if dust got in there, it could.

[Dan Milosch]

"...centrifugal switch...? What and where is it?

[Sebastien La Madeleine]

If you can provide the belt sander model number or of the motor we can potentially find a part diagram. With that said it’s a switch at the end of the motor shaft (usually near the fan shroud) that connects the start capacitor in circuit until the motor has reached speed. I assumed your sander had an induction motor and not a universal motor.