Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k
Motor starts and pressure gets to 15/20 psi then motor slows down and trips. Motor is new and valve is new. If i take intake tube off tank motor will run, when the tube is attached to the tank is when the problem occurs.
Make sure your pressure switch is set correctly. Check your pressure gauge and make sure it is functioning correctly. Also,seems sometimes if there is any time when there isn't the adequate amount of power demand supplied the motor heats up more causing the thermal protection switches to act a little finicky which in turn shuts it down.Check how many amps the motor is rated compared to the breaker controlling the circuit. Is it a dedicated circuit only for the compressor or are there other things also drawing power from the circuit ?
Posted on Nov 17, 2008
Does this trip on pressure or is it a breaker tripping? If you took off the intake then there is no pressure build up, thus it wouldn't trip the pressure switch. But would at the same time add a load to the motor. First check and make sure motor is wired properly, then check that pressure switch is wired properly and is adjusted to the right pressure. I don't believe that the intake tube would be clogged, it's a straight hole into the tank. But could be a possibility.
Posted on Oct 23, 2008
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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. 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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