Hi, I have a Central Pneumatic air compressor model 94667. The start capacitor burned, so i replaced with a similar size cap. It went fine for 3 minutes and the new capacitor got smoked and started to pop. I'm thinking the centrifugal switch didn't shut down the current to the start cap, so it's overloaded and burned. I can't find any centrifugal switch on the motor. Can you please tell where it is or how to fix this issue? Thanks.

We get many chinese compressors with burned capacitors. Most seem to use a 140 uf 250v ac metal run cap.(fairly large metal ). The cap will test bad but not look burned. The motors look pretty crude in the way that they are wound (no start winding) and varnish used on the wiring will not take the heat like other motors. Most likely faulty windings. If you try another cap (or two caps to make value)make sure that the voltage is 250 or higher and run type (metal or light color plastic, not the black start caps) (the higher the voltage the better the quality of materials used ). If the checkvalve is faulty at the tank, the motor will have a higher load at start and run (with out start winding motor works harder to start, if all components are not working correctly, motor /cap will overheat ). Check before next test. Good luck