Question about Craftsman Air Tools & Compressors
The motor start/run capacitor is bad, it wont start against the air pressure w/o this start cap for added torque,replace it and it will start
Posted on Oct 03, 2010
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Posted on Jan 02, 2017
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Apr 27, 2011 | Hitachi EC119SA Twin-Stack Air Compressor...
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 if not working properly, talk to the people you bought it from to have it repaired under warranty seeing that unit is brand new .
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