I picked up a Rigid GP90135 gas powered air compressor on the cheap a few weeks back. It's in pretty bad shape, but with a new belt and fresh gas it fired right up. It seems to pump pretty good, and quick, but there is some oil in the air and tanks. The main issue however is the unloader valve that doesn't seem to function too well. The engine isn't being throttled as designed and I believe the issue lies with the pilot valve.

When the tank reaches 125 psi, it cuts off and throttles back the engine. However, when the cut-in pressure is reached the valve isn't releasing pressure at the throttle control port. This causes the throttle control cable to remain in or near the idle position and the engine stalls. I've taken apart the unloader valve to clean it out, and it was dirty. I put it all back together and following the instructions on your site, I tried to re-adjust the pilot valve correctly. I was marginally successful, but whatever I did I still had air coming out of the throttle control port.

It should be noted that the unloading toggle on the pilot valve was broken by the previous owner. It looks like he was using pliers to manually unload it.

Short of a new unloader valve assembly, what are my options here?

Thanks

I think the issue I'm having with trying to tune it is that the unloading toggle stem has a slight bend and/or the spring for the is weak. It is often times leaking from the toggle stem area when I'm trying to tune it. Is there a repair kit out there to replace this part of the pilot valve in order to get a new spring and toggle?

I'm going to see if I can get my hands on a tachometer to confirm my RPM's on the engine. If anything, they seem a bit high, but who knows.

Thanks!

Thank you for the honest response, I'll give them a call to see what they say.

One last thing, I noticed that the sleeve on my throttle control linkage was coming out of the valve when actuated. What I mean is, when the throttle control valve would activate, the inner cable would make the outer cable (or sleeve) come out of the valve. When the valve would deactivate, the outer cable would come back but wasn't always going back inside the valve. I don't think this is normal either, and it's probably another part that needs replacement. My throttle controls on the engine are very loose and lubricated.