my compressor only builds up pressure up to 90 psi , how do i increse it to 150psi as it says on it that can run this high, the gague on it says 200 psi max , there is a nob that i can turn but only decreases the pressure , why does it stop pumping at 90 psi whats wrong with it ? where is the main valve that tells the compressor when to turn off ?
There will be a pressure switch in between the line cord and the motor; it will be connected to the tank or an air line. There should be a screw or nut to adjust the pressure setting. If this is one of those cheap oilless compressors, it may be hidden under a cover along with motor/pump assembly.
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