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

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After the compressor fills completely (up to 120 pounds) it used to shut off completely, but lately it hasn't

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Remove pressure control cover little black box by air connector and check that switch assembly is clear of dirt and not damaged or apart than run compressor and turn adjustment to desired shut off pressure

Posted on Oct 05, 2009


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Posted on Jan 02, 2017


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My craftsman 4 gal pancake compressor kicks of the breaker when the switch is turned on. split second buzz aand then OUT GO THE LIGHTS...

well craftsmen doesnt make 3phase compressors in fact there all low voltage 120 volts , so lets start there the outlet your using is it rated for 20 amps 120 volts ? if not theres your problem but thats ok unplug compressor and use a small screwdriver thru the fan end to move motor shaft around thru one complete turn if you encounter any real friction the unit is damaged and needs repair

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1997 Chevy S-10 4.3 Vortec a/c blowing hot. Compressor and compressor clutch is working. Charge is up on system. Both low and high side is hot.

Usually when this happens it is the compressor. You really need to have the high and low pressures checked to properly diagnose the problem. You can have the low at 45 pounds and think things are OK, but the high is at 120 pounds. This is a problem. And high a 350 pounds is a problem also.

Sep 03, 2011 | Chevrolet S 10 Cars & Trucks

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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.

Mar 16, 2011 | Air Tools & Compressors

1 Answer

Have a 6.25hp , 28 gallon stand up. It fell over and bent some of the regulator parts. Got that straight but when you plug it in it does not start up. Un plug and try seams like something in the...

It sounds like the problem that you are having is with the unloader if there is only 30 to 40 pounds of air pressure in the tank it would probably start,but if the pressure is around 90 pounds it would be starting underload, the unloader should exhaust the air from the compressor so it does not have to start underload the unloader does two things it works the magnetic switch to turn the compressor on at probably around 90 pounds and off at about 120 it usually uses 120 V to work your magnetic breaker that uses 240 V I hope this helps.

Feb 19, 2011 | Campbell Hausfeld 28 - Gallon Air...

1 Answer

Compressor initially starts up and fills tank to 120 psi with no problem. Compressor shuts off. When a tool is used the compressor tries to kick back on but hums and won't turn pump. If the "off"...

There is a small valve on the pressure switch that should relieve the pressure between the compressor and tank check valve. Make sure when pressure switch trips, it engages the relief valve and it bleeds the air out. Sometimes the valve itself comes loose and is not engaged by the lever in the pressure switch.

Oct 30, 2010 | Campbell Hausfeld 20 - Gallon Air...

1 Answer

After starting the compressor, the tank does not fill up to 120 psi and shut the compressor off automatically. It will continue to run and not fill the tank completelhy. How can I fix this?

It could be one of three things. 1. The air intake could be dirty to the point that it cannot take in enough air volume with each cylinder stroke to be able compress it to 120. Try cleaning the air filter. 2. The reed valve that prevents the return of air from the tank to the compressor is not sealing well. This might be cleanable, but requires disassembly. 3. The cylinder itself has a poor seal giving you bad compression. This would require major surgery and parts, and is probably not worth fixing.

Jun 29, 2010 | Campbell Hausfeld FP2080 4 Gallon Portable...

1 Answer

The compressor bleeds off air at 120 psi and the motor won't turn back on to fill unless it drains completely.

ok buddy your pressure switch has gone faulty this can happen i reccomend replacing with a new one off ebay for cheap buddy

Nov 02, 2009 | Campbell Hausfeld 13 - Gallon Air...

1 Answer

Model # DD2T2,compressor does not stop,till it bleeds back to 80 pound,pressure switch has been change. should stop at 120 pounds

so buddy what your saying is the compressor stops and then bleeds down a lot of air get back to me

Sep 27, 2009 | Air Tools & Compressors

1 Answer

Leaks air at the pressure switch

start your compressor and let it buid up pressure to turn off. then unplug from power.lossen the fill tube that goes from the pump to the tank. when you loosen it. if it leaks air then your check valve is bad and will have to be replaced.

Dec 25, 2008 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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