Question about Craftsman 3 gal. Air Compressor, 1.5 hp, Horizontal k

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33 gallon craftsman reaches 40 psi. Motor continues to run but pressure does not build.

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Check head gasket

Posted on Jul 30, 2010

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I have a 6hp 33 gal aircomp i builds up to 100 should go to 250 wont shut off because not up to press can you help


Sounds to me likt you have a bad motor, or compressor. The compressor rings might be leaking by only holding 100 psi.

Aug 10, 2012 | Craftsman 33 Gallon Vertical Portable Air...

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My Craftsman 33 gallons air compressor can only get up to 50 pis. When i first got it the psi go up to 150. I just bought a new pressure switch and it still the same. The motor run none stop and pressure...


hi,
one thing that would be worth checking is the pressure release valve which is usually located on the bottom of the unit. This valve is suppose to be used each time the unit is turned off. For obvious safety reasons you should release the pressure from the tank each time you are done using it. If this valve is leaking or was left open then you will not be able to achieve the desired full pressure. Just checking if this is tight may be your solution! Hope this helps!

Aug 29, 2011 | Craftsman 33 gal Air Compressor 6 hp...

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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.

Mar 01, 2011 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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Pressure in the tank only builds to 30 psi


Bad check valve. But I would check the regulator, by turning it down to about 10 PSI and running it and see if it builds again, if that works then it is the check valve. But from what you are saying I would replace the check valve anyways.

Jun 05, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Air Compressor will not stop once plugged in


check tank pressure as it may be the rings n not getting to set pressure or faulty pressure sensor

Mar 22, 2010 | Measuring Tools & Sensors

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My 33 gallon air compressor will at start build up to 120 psi and shut off, after use and at about 80 psi the motor tries to start but kicks our circuit breaker? Any help would be greatly appreciated!


Most likely it is the unloader valve. This is inline with the air filltube from compressor to tank. Somestimes the unloader valve is screwed into the tank and air tube is attached to it. This device takes the pressure out of the tube so the compressor can start without the back pressure from in the tank. Other possibility, the start capacitors of the motor. The capacitors must give a kickstart upon startup or the motor will just hum for a couple seconds and overload the breaker. A tempoary solution is to turn off the power to compressor when it reaches 120psi, then allow the pressure to drop to 40 or less, then turn power on and mostlikey compressor will start with a load of 40psi or less. It is a nuisance but it works until you replace the bad part. Goodluck,Macgivor

Jan 16, 2010 | Craftsman Air Tools & Compressors

5 Answers

Air compressor 3 gallon


When I turn compressor on it does not build up any pressure ?

Sep 09, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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