Compressor runs until it reaches full pressure, motor stops. air releases from place where black tube goes into the swich( not the pressure release valve). pressure drops until it kicks back on, will not hold air. keeps on cycling on and of?
I believe you have a faulty pressure switch. The black hose reports to the switch what the pressure is and either starts or stops the compressor through the switch. Air is bleeding out of the hose ...causing short cycling ... for some reason. Fix the leak - fix your problem
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Hmmm ... not sure there is a check valve. I guess it could be ...
The connection I am speaking about has to be open to the pressure vessel so it will know when the pressure goes below the "turn on" setting so the motor will start. The "plumbing" is otherwise solid?
There is a over pressure relief valve that could be leaking (failed to close properly after it was forced open) Or maybe it is set lower than it should be set. Don't adjust it to a higher pressure!
Check the pressure relief and the "dump" valve. The dump valve lets the air out of the cylender that was at or near TDC (has lots of pressure in it ready to go to the tank but didnt get out) when the switch reached max pressure and shut the motor off. Purpose of that dump valve is to make it easy for the motor to restart when it is time (when the pressure goes down).
Let me know what you find out.
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It sounds like the small valve that releases the pressure out of the main pipe that runs between the compressor and tank is not working once the tank is full and the motor automatically cuts off. You know this valve is working by the sound of a short spurt if air being released when the motor cuts off. Releasing this pressure means that the motor is able to restart easily because there is no load. If the valve is not releasing this air, the compressor is trying to start under full load which the motor is not capable of doing, hence the humming and popping of breakers due to a current overload as the motor tries to start. Motor burnout is possible if it keeps recurring.
This small release valve is attached to the Pressure control switch that switches the motor On & Off and usually has a small pipe going to it or is incorporated inside the Pressure Control Switch. If the valve appears to be working then it means that the Non-return valve on the input to the tank is not sealing properly and letting air back into the main pipe causing the compressor to start under load. Check both valves for correct operation and replace as necessary.
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I believe it is a faulty check valve, i pulled it out and it seems to be faulty.
but i cant find a replacement one that looks like it would work.
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