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My craftsman 25 gal. 5 hp. compressor builds 120 psi, shuts off then bleeds off head pressure, sometimes it stops sometimes it will continue to bleed off. I know its not the relief valve could it be check valve in tank or something else?

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Replace check valve the piston is getting stuck sometimes alloying the air to leak all the way down till it comes back on

Posted on Jul 21, 2009

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My compressor will not go over 20 psi i have a craftsman 921 4 gal 125 psi compressor and it will not build past 20 psi i do not know how to get to the pistons and stuff what do i do?


The problem with compressors not building pressure is usually a bad pressure switch or bad regulator. Does the motor shut off at 20psi or does it continue running and not build pressure? If the motor continues to run with no increase in pressure, the you should go over the machine looking for air leaks from your regulator back all the way to the motor. Any air leak while the compressor is running can cause the pressure to "peak" way before the intended shutoff that it is regulated to.

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Does it shut off at 25 psi or just keep running and never build more pressure than that? Also, did this come on gradually or suddenly? Also, was it being used regularly when it happened or had it been sitting for a while?

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I Have a 5.5.hp oilfree air compressor that builds air up to 45 lbs an stops building pressure and keeps run.will not shut off


Is you air regulator working? I suspect your reed valves in the head need replacing as they may not be holding pressure over the 45psi that you mentioned, and are allowing the air pressure to defeat them which allows the psi over 45 psi to bleed back into the air compressor cylinder.

Oct 29, 2009 | Air Tools & Compressors

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Unplug it and listen for air leak. What pressure does the manual tell you it should run to? The safety release could be bleeding air, listen for that, with it off. Make sure it is designed for more than 60 PSI by manufacture.

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Air Compressor will not build up over 25 PSI


your max pressure switch is faulty, and shutting off the power early. replace switch, check owners manual for location(should be near power wires)

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Mastercraft 2.0 hp air compressor will not build up over 25 psi


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Lack of pressure


My air compressor builds up to 40 psi and just keeps running, i have a craftsman 5 GAL, 1HP, 125 PSI and pressure goes up to 40 psi and dose not go any higher and on the other hand engine keeps running and dose not stop. Please advise?
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Kia

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