Ingersoll rand compressor type 30 is not unloading. Auxillary valve seems to be dirty with oil and at 150 psi the compressor is not unloading
Air Tools & Compressors - Ingersoll - Rand Type 30 Reciprocating Air Compressor 5 Hp, 80 Gallon,...
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Answers & Comments
It sounds like the pressure switch is bad or out of adjustment. Typically the pressure switch is set at 175psi on a 2340. If the auxillary valve you are speaking of is on the pressure switch and is constantly blowing air from it you have a bad receiver tank check valve. Also if you are getting a lot of oil out the valve at the pressure switch you may have some oil control rings bad.