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My D55141 heavy duty 2gal (7.6L) 150 psi max builds pressure up to around 150 releases pop off valve then keeps running, what causes this problem?

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Sounds like you have a bad safety valve releasing to soon, all you can do is replace the safety valve with one with the proper pop off setting. Yours should be stamped on the valve it self with the proper PSI that that valve will pop off. 150.psi is about the max a 2 gallon should have, pop off is usually just above that setting on your regulator

Posted on Jan 10, 2015

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The pressure switch is either out of adjustment or has failed. The compressor should shut off at a much lower pressure than the safety valve (~100 psi)

Posted on Nov 21, 2014

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Posted on Jan 02, 2017

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SOURCE: My EC12 builds up pressure, but then releases all but about 10 psi.

The non-return valve is sticking and it's an easy fix. First, for safety, unplug the electric power to the unit and release any pressure in the tanks. Then unscrew the cap of the non-return valve (between the compressor and the tanks). Inside you should find a tapered rubber plug which is probably sticking in the valve housing. Sand down the diameter of the large end of the plug, being careful not to damage the flat face at the narrow end (which is the sealing surface). For sanding try 400 or 600 grade wet-or-dry paper and sand until the plug just moves freely in the housing. Reassemble and the compressor should work. Incidentally it's an oil-type unit, and quite durable. Make sure it has enough oil.

Posted on Nov 14, 2008

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SOURCE: WILL NOT BUILD PRESSURE

Many craftsman compressor are built by champbell hausfeld using a dry type of cylinder and piston (no oil, no crankcase). If dry type, check for worn cylinder and piston ring. Pieces of the vinyl ring can jamb between the reed valves in the head causing air to escape from the intake. If your compressor has a crankcase and oil, check for broken reed valves in head. Spray soap solution on hoses, checkvalve, drainvalve, and fittings to check for leaks. Most likely problem is reed valves broken or open. Parts are available from sears or match parts to chpower.com. enjoy

Posted on Nov 27, 2008

  • 1 Answer

SOURCE: compressor will not build pressure

compressor will not build pressure

Posted on Feb 28, 2009

  • 1 Answer

SOURCE: EC-12 runs but only builds to 35 psi and continues to run

so i came to this web site for help. where is the help? are we troubleshooting? come on man! what is this? my compressor runs and runs but does'nt build up pressure. it aint the pressure gauge, dummy. its is a problem with some kind of valve that is supposed to kick on- or off when the pressure gets low enough. problem is which valve and how to fix it! and to the guy whose compressor hums, dont use more than 25 ft of cord, and use the correct size cord and the correct power source.

Posted on May 04, 2009

  • 76 Answers

SOURCE: Ingersol T30 won't shut off and blows pressure release valve

the wire juction box on your compressor has a pressure switch that may be wound in to tight take the cover off the box there should be a switch with a machine screw with nut and washer and spring back this nut off and see if that helps if you go to far you just crank it back in until the switch hit although it may be the other way around you may have to tighten to lower the pressure some of them are made that way if this does not solve your problem send me a picture of the switch and can solve it from there

Posted on Jun 26, 2009

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1 Answer

Dewalt compressor builts pressure but doesn't supply hose and tool with the air


Dewalt sells a rebuild kit for the regulator (my be part # N008792). You could try lubing the internal parts before ordering the kit. With no air in the tank, remove the plastic knob assembly and pull out the small piston. In the center of the valve body will be a small brass plunger. You should be able to push this plunger in with thumb pressure. If stuck, remove the nut on the back of the valve and lube the plunger with grease (pull the plunger off the back-nut if stuck in place). Lube the piston and cylinder (black plastic piece) with grease and reinstall. The small piston has a lip seal that should point toward the body of the manafold. For emergency air, remove the safety pop-valve and install a tee fitting. On this tee fitting reinstall the safety valve on one port and a quick disconnect on the other. You can draw air out of the tank at full pressure untill you repair the regulator. Good luck

Mar 29, 2013 | Dewalt D55141 Heavy Duty 2 Gal, 150 Psi...

1 Answer

I have a Dewault D55141 air compressor that runs to 150 lbs of pressure and blows the valve and releases air. I read your reply to same problem about cut out pressure adjustment


Looking at your manual, instead of the actual item since I don't have one, I see 312, 329 and 314. It is possible that 312 the switch is shorted causing the pump to run to pop off and beyond. Item 14 is the pop off valve and if the numbers indicate anything, it is a 175 PSI pop off and is going off early. The switch doesn't have any indication of pressure rating.

The screw and bracket that mounts on the switch may be a pressure adjustment but hard to tell remotely.

Some units like this don't have adjustments, they just pump to a predetermined pressure and stop, being determined by the pressure switch and if the switch fails, a pop off will prevent over-pressuring the tank or system.

If you determine that the screw and bracket do not make an adjustable pressure switch, replace the switch with a like on or one that you can adjust in the range you need. Also if the pop off is going off early, replace or if possible, clean it, they can become dirty with rust.

Is possible that the screw fell out of the pressure switch rendering it "broken" until you put it back in....

Nov 04, 2012 | Dewalt & 2HP Hand Carry Heavy Duty...

1 Answer

Compressor relief valve opens 150lbs on my d55141


That is the compressor's holding capacity 150psi. Therefore, the cut-out pressure has been reached. The safety valve opens to relieve the excessive psi. Compressor should come on at 120 psi.

May 15, 2012 | Dewalt d55151 factory reconditioned emglo...

1 Answer

I have a Dewault D55141 air compressor that runs to 150 lbs of pressure and blows the valve and releases air. I bought it new about 2 yrs ago? What needs to be done with this problem? I noticed on this...


Hello;
150 is your cutout pressure. It's the factory setting and is not a problem. But, It appears you have a pop off (safety) that is set for 125 psi, So, If you want 150 psi, the pop off needs to be adjusted. If you want 125 the the cut out switch needs the adjusting. The setting. More than likely the 125 psi pop off valve is correct and the switch needs to be adjusted down below the pop off pressure. To sdjust the switch, remove the cover of the box the cord comes out of.Adjust using the screw(s). There should be one for cut in and another for cutout pressuressures. The cut in pressure should be 90 psi and the cutout should be at 125 psi.If the pop off valve blows off at 125, It needs either replace or adjusting. It's best to replace it.since the spring inside has lost tension. You will be constantly adjusting it otherwise. Good Luck -Ned_ Take caution not to get your tool or fingers into the electrical in the switch box.

Apr 15, 2011 | Dewalt & 2HP Hand Carry Heavy Duty...

1 Answer

Dewalt D55141 builds pressure and cuts off at proper psi. When using a tool though it drops off quickly and although the pump comes back on, it can't keep up with the tools it used to. This is a...


Check to ensure that the storage tank has no fluid in it, open the drain valve and blow it out. There may also be an inlet air filter on the compressor, make sure that is clean and there are no obstructions.

Nov 27, 2010 | Dewalt & 2HP Hand Carry Heavy Duty...

1 Answer

D55152, left gage shows 40psi, right gage 100. Whats going on. how can i buy a manual? thanks


The right guage is the actual tank pressure. The left guage is the pressure for the air hose. If you turn the adjustment dial the air pressure guage on the left will go up or down. You should be able to go to the dewalt website and find an owners manual for this compressor. I personally own this compressor and it is a good one.

Nov 14, 2010 | Dewalt D55141 Heavy Duty 2 Gal, 150 Psi...

1 Answer

How do I adjust the cut-out pressure on my DeWalt D55140 compressor? The relief valve is activating at 140psi before the compressor cuts off.


I had the same problem. The relief valve loosened up after a couple years of use. Right around the center pin in the relief valve is a ring that has a slot in it that you can fit a small straight blade screwdriver into and tighten in a clockwise direction. This should tighten the spring on the relief valve and raise the pop-off pressure above the 150 psi setting of the cutout switch.

Apr 10, 2010 | Dewalt D55140 Heavy Duty 1 Gal, 135 Psi...

1 Answer

It only builds pressure to 70 psi.


there the pressure regulator between the 2 guages needs turned up. it may be a locking type if so pull out or push it in and turn it, if that doesnot work the regulator may need to be replaced.

Jul 19, 2009 | Dewalt D55141 Heavy Duty 2 Gal, 150 Psi...

1 Answer

Dewalt d55141 Builds only 45psi


Check the unloading valve. Accumulation of dirt might be preventing the valve to fully close, by-passing a portion of the compressed air.

Jun 07, 2009 | Dewalt & 2HP Hand Carry Heavy Duty...

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