Adjusting compressor pressure

The air governor should be bolted on side of compressor, is aluminum with 2 small lines to it say 3/8 or so at one end is a plastic cover you screw off then you will see your adjustment screw and jam nut. Jam nut is usually a 7/16 or 10 mm and a flat screw driver to turn adjustment screw turn it out to raise pressure ifI remember right sholdn't need but a turn at most.

 

Replace the cut-out governor. It controls the cut-in & cut-out pressure. It's common for them to go bad.

Edit: If it's not old and runs the 120 cut-out consistently, I'd say woreout has the better & less $$ recommendation.
We posted at the same time.

 

Exactly. I boosted mine a few months back, right up to 135 cut out pressure. Way better now, especially for pulling an air ride super b. I don't think you need a new governor, just need to tweak it up. They are typically set to cut off at 120 when you get them. Not hard to adjust.