Sad story that had me pulling my hair out.
My 20 year old air compressor blew a head gasket. After research and $ 112.oo later I had to buy a complete gasket set.
After the repair, the compressor would only pump to 40 pounds then trip the breaker, removed and replaced the head 6 times trying different things. Decided the motor was shot. Trip to 3 different stores to find a pully to fit a replacement motor I had. Installed the motor and flipped the switch. SAME THING!! Pulled some more hair from my head. Thought about my problem for a day. Finally decided to hook motor direct to a different circuit breaker bypassing all old switches. Ran like a new one!! Installed old motor put in new circuit breaker and it works like new. This was my fun for the last 4 days.
Jeesh Jim, Who hasn't done that?