Sounds like something weird going on over there in your compressor. Anyway, to adjust the pressure switch, remove the cover and screw the nut one way or the other that sits on a washer on a spring over a threaded rod looking thing. I think you unscrew it a bit to lower the operating range.

First, did this just start happening spontaneously, or did you get this thing used and are trying to get it working? Certainly don't mean to offend, but make sure it's the safety valve releasing and not the unloader. If this problem is being caused by the unloader, you may have some faulty valves in the compressor head or be missing a check valve, depending on how your unit is supposed to be set up.

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