Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k
Once my compressor reaches the cut off pressure and I use a tool with it, when it tries to restart to rebuild pressure, it will not start and blows the electric breaker. I need to know what part to replace. Is there a capasiter or another swith that helps it restart?
This is likely a bad check valve which is allowing pressure from the tank to leak thru back to the compressor. The compressor won't start because the compressor cylinder has air pressure on it.
The check valve is about the size and shape of a .410 shotgun shell -- it's in the copper line from the compressor to the tank.
Posted on May 27, 2009
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Posted on Jan 02, 2017
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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.
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