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My compressor runs fine until it gets to about 100 psi. It then sounds like it labors hard, and then blows the circuit breaker. Any suggestions? It is a Crafstman 6 hp,k 30 gal, 150psi max single cylinder oil free.

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Never assume anything; check your pressure guage to make sure it is reading correctly. If a guage gets faulty, it could be showing less pressure than before, but everything else is the same, therefore the pressure is the same as always but the guage says different. If guage is good and 100 lb shows just as there is 100 lb in the tank, then maybe your electric line is not sufficient capacity and the motor starts to labor because it is pulling more energy than the line can produce and therefore everything heats up and the breaker pops. Have you moved the compressor or had a need to change the electric line and maybe it is too long or toosmall to handle what it did in the past ? Or, maybe the motor windings are old and getting deteriorated, thus allowing the motor to lose power and without the extra power to fight the pressure as it builds, the motor and line strain to work, and the breaker pops. Or, maybe the inlet and outlet valves on the head are weak and cannot hold the pressure in check as it builds in the tank thereby forcing the motor to work even harder against the pressure it already built-up; in this case, the head needs to be removed and new valves and springs replaced. Most compressor companies offer a valve kit just for this purpose. Goodluck, Macgvior

Posted on Jan 31, 2010

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