How to check 220-240 volt single phase capacitor start motor if it will not start?

Answer 1

I'm assuming you want to check to see if the motor works.

In other words, if the motor isn't working you want to know if the motor is bad or the capacitor is bad.

Turn on power to the motor, and carefully attempt to start motor rotation in the correct direction by manually rotating the shaft or the load connected to the shaft.

If the motor will maintain its motion once you get it started, the problem is most likely a capacitor. Check the capacitors for bulging and replace any defective parts.

If the motor will not spin at all, or will not maintain any momentum, the motor is likely the problem. You can replace it or try to reduce the rotating friction by lubricating the bearings, etc.

IF YOU'RE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

If you do this work yourself, always turn off the powerat the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator to insure the circuit is, in fact, de-energized.

Answer 2

If it hums, but doesn't turn and the shaft freely turns with no power applied, then you need to replace the starting capacitor. Be sure to check the brushes before doing anything as they may be worn enough to also replace.