The Stovebolt Site Forums The Shop Area The Tool Chest Old Air Compressor issues

Moparguy, I would not use the air conditioning Hard Start capacitors in that application. The motor has it's own internal switch to disconnect the start capacitor when it reaches a specified RPM. The Hard Start caps are designed to connect in parallel with a run capacitor in an air conditioning system and they have a relay built in under the black plastic cap, that relay drops the capacitor out of the circuit based on current or voltage difference and may not be the best for that motor. I would first research the correct RPM for that compressor as Mike B has noted, then replace both capacitors if you are going to use the motor, the run cap is as important or more than the start cap.