Compressor rebuild parts

[pishta]

A bad start cap will cause the motor to draw a huge amount of startup power and will trip the breaker. Think of it as a surge tank for energy. It sends a power surge to the motor to get it moving and then pretty much just sits there. The run cap is smaller and smoothes out the A/C power pulses.

 

[4spdragtop]

I paid $15 for my start capacitor....

 

[6PakBee]

A bad start cap will cause the motor to draw a huge amount of startup power and will trip the breaker. Think of it as a surge tank for energy. It sends a power surge to the motor to get it moving and then pretty much just sits there. The run cap is smaller and smoothes out the A/C power pulses.

That's not exactly correct. There are three basic types of AC single phase motors. 1) one with a starting switch and start winding 2) one with a starting switch and start winding with a capacitor (capacitor start), and 3) one with a starting switch and start winding with a capacitor and a running capacitor (capacitor start/capacitor run). A single phase AC motor cannot start from standstill on one winding. It has to have at least two out of sync phases to start and the starting switch in conjunction with the start winding does this. Adding the capacitor to the start winding increases the phase separation and results in higher starting torques. The run capacitor that remains in the start circuit results in higher operating torques.

 

[mbaird]

I dont think its the motor because it runs fine until the tank hits around 80 psi. Which leads me to think it may be a sticky valve like Steve suggested .