Question about Craftsman 1 Hp, 4 Gal. Air Compressor

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I have a craftsman 1hp 4 gal compresor. It's not building pressure and air is pumping out of the air filter not in???

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Sounds like reed valves are bad,sometimes you can take the reed valves and flip them over for short fix,best to put new one in unit.

Posted on Jun 27, 2009

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Actually these reed valves a pretty tough. They don't flex but rather rise and fall in the reed cavities.
I had the same problem and found the head gasket blown. This gasket lies between the head and the upper reed plate and has only a 1/4 inch strip of material between the intake and output reed valve cavities. Periodic retorquing of the head may be advisable.

Posted on Sep 11, 2012

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1 Answer

I have a 3 gal craftsman air compressor. Compressor runs but will not build more than 20 psi in tank reserve. Whats wrong?


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The compresor is not building up the pressure, it only reaches like 15 PSI .. and is not the drain valve


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1 Answer

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Dan

Jan 11, 2010 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

Craftsman 1 HP 4 Gal air compressor runs and sounds like the air pump is working but no pressure is building up


Cold weather will freeze the water the compressor normally makes and this can prevent the switch diaphragm from releasing.... also drain the tank

Dec 27, 2009 | Craftsman 1 Hp, 4 Gal. Air Compressor

1 Answer

The air is coming out of the filter instead of intake . Craftsman Air Compressor 12-gal 1hp model 921.166400


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1 Answer

Air pressure gauge does not move on Craftsman 1Hp, 12 Gal. Air Co


I would say that the gauge needs to be replaced. These are common items so go to any auto parts or craftsman hardware store and purchase a replacement.

be sure to use some joint compound or teflon tape on the threads so u dont have any leaks.

please rate my answer. thanks.

Feb 03, 2009 | Craftsman 1 Hp, 4 Gal. Air Compressor

4 Answers

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?
Thanks.
Kia

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