My neighbor and I just rescued a nearly new Delta AP400 dust collector that was sitting by the side of the road with a “free” sign on it. The note on the manual said the motor was bad. Otherwise the system was in pristine condition, the bags weren’t even dusty. Brought it home and plugged it in, sure enough the motor just hummed. Turned the power off immediately, took a screwdriver and gently turned the motor about a quarter of a turn. Switched it on and it immediately went to full on RPMs with no signs of slowing down or evil sounds. This process is repeatable if the motor comes to a complete stop. If the power is cycled on before the motor stops spinning, it immediately wraps back to full RPM.
Searching through the net it sounds like these models have issues with what has been variously referred to as the “startup” capacitor or the “run” capacitor which are supposedly different beasts. Showing my ignorance here.
As no one in this area deals with Delta parts, particularly for something of this vintage, any and all comments will be welcome. My neighbor wants to give it to his son-in-law if we can get it up and running.
Thanks in advance.