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After moving across the country, the compressor never shuts off when plugged in. there is a hissing under the switch at a pin hole below the pressure switch. Also once the compressor reaches 70-70psi. the on/off button wont turn off the compressor. It keeps popping up. It is a Rigid, mini wheel barrel 5 gallon compressor

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The pinhole leak is most likely your problem. However pressure switch leaks are often misdiagnosed.

Drain all the air from your tank.

Follow the 1/4" copper or plastic line that connects to the pressure switch back to where it meets a fitting that screws into the tank.

Take the lines off of that fitting and take the fitting out of the tank. That is your check valve. Be sure that isn't leaking or obstructed in anyway.

If it isn't leaking or obstructed I think you need to replace your pressure switch. Without having hands on access to your unit I can't be sure.

Posted on Aug 31, 2010

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Its not going to shut off till it hits its set upper limit, There is a check valve that is spring loaded that as the piston pushes air out of the cylinder into the tank it shuts as the piston is going back down to get another load of air to push into the tank. If the check valve goes bad and they do go bad, actually they burn a side off the flat disk inside the check valve that drops over the hole to hold back the air in the tank ,it will let the air chase the piston back down and leave no room for any new air to fill the cylinder. It is a ping pong affect. The size of hole in the disk at this point is small enough to allow you to build to 60 psi and your upper limit is probably set above 100 psi so until it reaches that it will not shut off. I will attach a link to a what it looks like and the ones I buy. Ussaly if you shut it off and place your ear close to the limit switch you will air hissing. That limit switch has a dump valve in it to remove the pressure off the head so it can restart with out being under a load, the hissing is caused from the check valve leaking into the cylinder up the plastic line to the limit switch and out the dump valve.

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1 Answer

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