This is an 8 year old air compressor that I have had since it was new. The problem began with the unloader continually leaking after pump up and I did not know what was causing it at first. To investigate I messed with the pressure switch where the unloader is housed. I pulled the pressure switch apart and lost control of the process because of the powerful springs inside. I then read somewhere how the unloader works to unload pressue off the piston (after a shut down) so at the next start-up the unit does not have to start with pressure already on the piston. I realized that the check valve was bad and causing the unloader to vent the tank pressure. I replaced the check valve. And because of the damage I did to it, I replaced the pressure switch. The safety valve blew when it pumped up to ~125 psi (however, the gauges are the cheap ones that came with the compressor so I am not sure what the exact pressure is). I replaced the pressure switch with another new one from Sears and the same thing happened. I replaced the safety valve twice also with the same results. The unloader no longer continually leaks when I turn unit off with pressure still in the tank, so the original problem seems to be fixed.

The new pressure switch does not have a nut on the spring like suggested by someone responding to this site; it seems to have a very special adjusting device (requiring a special tool). At first I thought that it was a special torque bolt but that is not the case. It looks more like a fixed plastic dowel in the center with a donut-like ring of circles around the center dowel. I think that I need to find where I can get the special tool.

Any ideas?

Follow Ups:

Re: Re: Air Compressor Pressure Switch Ralph 12:48:19 05/09/02 (0)
Re: Re: Air Compressor Pressure Switch Frank 17:23:18 05/08/01 (0)

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