5hp Quincy air compressor frozen
(Holland Michigan Ottawa)
5hp reciprocating Quincy air compressor circa 1960's with 220v two stage motor.
Motor is fine.
Flywheel doesn't turn (frozen) thus nor do piston. Just hum.
Both belts seem ok.
Have checked oil, open compressor all seems ok in terms of lubrication, checked air filter and cleaned.
Any thoughts on cause of problem would be appreciated.