Ingersoll 7.5hp 2 stage compressor slow start/trip help

[jbc28]

I have an Ingersoll 7.5hp compressor purchased from Tractor Supply 2 years ago that is slow to start/restart. Most times it will start from empty, but will not restart. So far I have replaced the motor, the capacitors, and the pressure switch unloader valve.

I have also had an electrician check the power coming in, during start, during restart, and normal operation. On the slow restarts it will pull over 80 amps on a 220V circuit. The main breaker supplying is 100A the secondary breaker just before the machine is a 50A.

It ran fine when new, but slowly developed a slow start. I'm out of ideas, and about ready to turn it into a receiver tank.

Any help or ideas would be greatly appreciated.

 

[cvairwerks]

Check for the tank check valve leaking. Charge the tank and then take the line loose between the check valve and the head. Pull a balloon over it and tie the neck with some string or a tie wrap. Let it sit for a half hour or so. If the balloon inflates, change the check valve.

Almost forgot....trip the power switch off so that it can't start before you take things apart...

 

[jbc28]

Check for the tank check valve leaking. Charge the tank and then take the line loose between the check valve and the head. Pull a balloon over it and tie the neck with some string or a tie wrap. Let it sit for a half hour or so. If the balloon inflates, change the check valve.

Almost forgot....trip the power switch off so that it can't start before you take things apart...

Thank you