Question about Craftsman Air Tools & Compressors

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Air Compressor shuts off

I have a 30 gallon 6 horse Craftsman aircompressor that will run for a second up to about 4-5 pounds of air pressure and then it starts to struggle at which point it will blow the fuse.

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  • Anonymous Mar 17, 2014

    air compressor trips and has to be reset to startback up

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  • Craftsman Master
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Most compressors have a check valve installed in the tank that allows air from the compressor to enter the tank and not allow back pressure to the compressor. Also there is an unloader valve at the pressure switch that activates when the pressure switch cuts out releasing the pressure in the line. These two devices allow the compressor to start in an unloaded condition so that the motor will not strain. When you place you finger on the intake, the compressor is no longer pumping air thus there is not load on the motor. Your problem may be the intank check valve or the capacitor may be weak or bad. Simple check for both. Many volt meters have capacitor check and amp draw. The capacitor should not be more than 10 percent or rating. enjoy

Posted on Nov 28, 2008

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Posted on Jan 02, 2017

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I just bought a craftsman pneumatic 1/2-in drive impact wrench. And used it with my craftsman 4-gallon 1hp air compressor tried to loosen the bolts on my car wheel wouldn't loosen them help


Pneumatic tools are rated in cfm (cubic feet per minute). Your 1 HP air compressor is rated at probably not more than 3 cfm while the 1/2 " impact driver needs at least 8 cfm, maybe 12 chm of air.
The compressor must provide more chm than tool rating needs.
It is a problem, by the time you look at five horse power air compressors and larger, a lot of electric power is needed. A circuit of 220 volts, 20, 30, or more amps would be required to run those large expensive compressors.
If you can, return the air tool and get a good electric tool instead.
Leave those high air volume air tools to shops that are so equipped to use, or invest if you must.

Jul 24, 2017 | Craftsman Air Tools & Compressors

1 Answer

I have a central pneumatic aircompressor with a 21 gallon tank.It pumps up to 120psi then pops off down to 80psi and goes back to 120psi...back and forth... never stoping...could it be a bad pop-off valve?


I would first find out what pressure the compressor is supposed to shut off at. If it is supposed to shut off at lets say 110 then the pop off valve is doing its job you have to reset the pressure switch so it shuts off less than 120 pounds.

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Is your air pressure regulator set very low? Try adjusting it to a higher pressure

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if they are oilless compressors then the rings are worn

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Went to winterize my sprinklers for the first time. Have a 12 gallon, one horse, upright Craftsman compressor. Took a long time to get to 120 pounds and as soon as I opened a zone it dropped down to 30...


if your sprinkler system is very large at all, this is normal.

The compressor will not be able to keep up with the entire system trying to flow air all at once.

Blowing out each zone at the flow you can get out of the compressor for a few minutes should be sufficent.

It's also not a bad idea if you live in a very cold area to add a little antifreeze to the system. Just be sure you can recover it when you restart the system so that you're not sprinkling antifreeze on the ground when you restart the system in the spring.

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Compressor shuts off before reaching max pressure


Yes,but if the max is 125 you don't want to increase it above 110 and set off the pressure relief valve.

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Craftsman compressor runs for 10 sec. and shuts off.


I have a Craftsman 2hp/12 gallon Air compressor that does basicly the same thing, will start, run for about 3 seconds and stop. I replaced the pressure switch but still have the problem. Any suggestions?

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