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On electric motors with two capacitors, one is a start capacitor, the other is a run capacitor. Start capicitors have plastic cases and are rated from 200mf to 400mf and higher depending on the size of the motor. Run capacitors are in the 20mf to 40mf range and usually have metal cases. If you have an electric motor service center in the area they can recommend what size you should use for the size (HP) motor you have.
The motor will run hot/overload if wrong size or too long cord is used. Also if pressure is set too high (most set at 125 ~ 135 at shut-off). In-tank checkvalve will also have effect on motor by loading the compressor at start-up. Easy test. Run compessor till you have over 100lbs in tank then unplug from power. At this point try to turn the motor /pump by hand, it should turn rather/very easily (this test is hard to do if the motor /pump is completely enclosed, you need to be able to turn the pump even if by truning the fan blade). If it does not turn easily let all the air pressure out of tank and then try to turn by hand. If it turns easily with tank empty try one more test. Run compessor till the pressure switch turns it off. Then unplug machine and turn compessor again by hand, should be easy. If not easy then unloader / checkvalve not working. The checkvalve could be leaking air back from the tank loading the pump. Replace parts as needed.
It is possible that the compressor psi as it is running drops below the tire psi creating a standoff. You must maintain air compressor psi over 110 to fill a tire to 110psi. Add air to your tire but stop when the compressor motor starts to run. When the motor stops then continue to add air until the compressor motor starts and again stop airing up the tire. Repeat as needed.
was it running before? what ahpened to it? Is it on 3 phase service or a converter? Does it run with no air in it? Is there a trip for 2 or 3 circuits or just one? I would suspect th epower supply first, and then check the motor to see if it is ok. If it is a converter, they are only good for x amount or hours. Check it out.
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