I bought a 3/4 hp motor off craigslist for $50 a few weeks ago and wired it for 110 v operation. When I power it on, it just barely moves, then hums. I'd seen this sort of thing before so I gave it a little "help" and the motor started running just fine. Bad start capacitor I figured, since that was the problem last time. The motor still has the same problem though, even with a new capacitor. I didn't have a chance to check the capacitance of the capacitor to confirm whether it's good, but at this point, can probably assume the cap isn't the problem.
I've tried to research the problem some and have read that it might be a cetrifugal switch that's stuck. Is that right? Is this easy to find when I open the cae of the motor and can it be fixed? I'm pretty sure the motor wasn't used much or at all. It's a 1725 rpm TEFC model that Grizzly sells for $120. It looks brand new, but the date of mfg on the motor is 1993. After bringing it home and opening up the wire box, it appeared that the previous owner did not know how to wire it because the configuration it was in didn't make any sense. So at this point, I'm $70 into a motor that won't start. Help!
David