Motor blowing the start capacitor, now throwing sparks from centrifugal switch!

Thread Starter


Joined Aug 2, 2023
Hi all, I got a Delta 50-761 dust collector second hand and it has been giving me trouble.

It turns on, fan runs, but it blows the start capacitor within seconds. I replaced the capacitor and it did it again.

I looked at the centrifugal switch, thinking it might not be functioning and causing the capacitor to overheat. I disassembled, looked at it, gave the corroded leads a hit with sandpaper, and put it back together.

With a new capacitor in place, I turn it on. Fan runs, but sparks immediately shoot out of the open top of the motor. Here's a video of me starting and stopping the motor:

Not sure what this new problem is all about, or if my steps up to now have been helping/hurting. I have ZERO knowledge of motors, so everything I've done so far has been figured out through youtube and forums. Any help would be greatly appreciated!!


Joined Jul 18, 2013
Did you obtain a motor start rated capacitor.?
What you could do is leave the start cap out and give the motor a spin in either direction and see if it runs OK at the rated RPM.