It's a Gast 1/3 HP dual piston model number 75R. I can't see how to get to the motor shaft without taking one of the two end plates off...haven't done that yet
That is the same model I have here. The motor is a PSC (Permanent Split Capacitor) motor. Good motors, but have very low starting torque. You swapped the capacitor, so it would be more likely that something is binding it up, like Bill said. These motors do not have an internal switch, so you won't hear a click when they start.
