Craftsman 1 Hp, 4 Gal. Air Compressor Logo

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Posted on Dec 27, 2009
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Craftsman 1 HP 4 Gal air compressor runs and sounds like the air pump is working but no pressure is building up

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Rod Wallberg

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  • Master 494 Answers
  • Posted on Feb 14, 2010
Rod Wallberg
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Joined: Jun 15, 2009
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Cold weather will freeze the water the compressor normally makes and this can prevent the switch diaphragm from releasing.... also drain the tank

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Related Questions:

0helpful
1answer

I have a 3 gal 1 hp air compressor and it will only build pressure to 27 lbs.

If it makes hesitation sounds just before shutting off, you need to oil the compressor as per the manual. This is the most common problem.
If it is kicking on and off normally, you need to adjust the pressure relay. The instructions are under the cover.
1helpful
1answer

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.
0helpful
1answer

My Craftsman air compressor has wored fine till now. It does not want to build up pressure beyond 50 psi.yes I did check the drain valve and no leaks. Motor seems to be putting out the rpm's and the oil...

Check for a leak between you compressor head (pump) and your tank. Your pump output may be good but as your tank pressure gets higher the leak will not allow the tank to build up.
0helpful
1answer

Will not build up pressure

worn out pump on the compressor, or leak in tank.

2helpful
2answers

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

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.
0helpful
1answer
0helpful
1answer

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.
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