Good cautionary note Tony. Cap's can whack you pretty good if you're not careful, but they discharge pretty quick and you don't want them discharging into you.
The 75R (I have one) has a PSC motor. There is a start winding with a capacitor and a run winding. If it just hums when you turn it on, it's most likely in the start circuit which could be the cap or start winding.
Cap's fail more frequently than winding's, but they also fail.
If the motor turns freely like spinning it with your finger, then I would discount a mechanical problem.
JKB, you ever charge an automotive condenser, (back in the dark ages) carry it into the auto parts store and toss it on the counter with a request for "one just like it"?
Always wanted to make sure you had a direct and clear line of travel to the door before doing so, however. Chances are there would be a partsman coming across that counter in your direction very shortly.
