Question about Dewalt 2 Hp 4 GAL Air Compressor

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I have a Dewalt D55141 compressor, it continues to run till the safety value blows and runs till it blows over and over. I changed the pressure switch and the problems continues. I am at a loss

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You may have a fualty safty valve or may need to adjust regulator setting

Posted on Oct 06, 2010


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Excessive air pressure buildup that's blowing safety valve and can hear air leaking inside unit.this compressor is only about a year old!thankyou.

Excessive air pressure...if your safety valve is truely popping off, is caused by a bad pressure switch or a loose wire connection at the switch. It's a little odd to be leaking too. There is a couple a possibilities here. The most common spots for leakage is the "tube seal", the aluminum transfer/supply tube, or the outlet air hose. Usually a leak will keep a unit from acheiving full pressure causing the unit ot run continuously. The other common leakage spot is the "check valve" and a leak here usually makes the auto restart (upon using air from the tank, taking pressure below the set lower limit), not work,stalling the motor and popping a breaker. See ereplacementparts for a proper breakdown and identification of parts. Spliting the clamshell is a "pain in the neck" for these little units, but you"ll likely have to do that to find your internal leak. Carefully avoiding electrically exposed parts, spray a soapy water solution at suspected joints if the leak is not obvious.

Oct 20, 2012 | Dewalt D55141 Oil-Free Hand Carry...

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

My d55141 compressor that i've had for about 2 years started running non-stop and it isn't building up pressure even though it's running. What could be causing this and how could i fix it?

There are a few things you will need to check.
If the unit is making more noise that it has in the past then the CAC-1212 tube seal could be damaged. If the compressor is not making more noise than normal then you will need to check the piston ring on the piston as well as the both the intake and exhaust reed on the valve plate plate.

Here is a parts diagram for you to view:

Sep 25, 2010 | Dewalt Air Tools & Compressors

1 Answer

Relief value releases and will not reset

Likely the check valve is bad or has contamination on the seat. The result is the pressure will bleed back out the compression relief valve which is often as part of the pressure switch.

If the safety valve is the one that is bleeding, then the pressure is set too high at the pressure switch.

Apr 07, 2010 | Dewalt d55151 factory reconditioned emglo...

1 Answer

I have a D55141 and it just quit working. I was using a palm nailer and it quit. Is there a reset button?

Yes, all compressor motors have a reset button, usually marked by an arrow. Push it in till it clicks, should be ok. They usually conk off when they are lacking power, like when the compressor is running and somebody fires up the skil saw, off goes the reset.Hope this helps.

Mar 21, 2010 | Dewalt Air Tools & Compressors

2 Answers

Hi I have a Dewalt d55141 emglo contiues to run

Open the shut off switch box and adjust the cut out pressure.

Nov 17, 2009 | Dewalt & 2HP Hand Carry Heavy Duty...

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...

1 Answer

Over Pressure

I suggest trying to adjust the pressure switch, however, it is more likely that the pressure switch is bad and will need replaced. These can be purchased at most hardware stores or After you install it, you will need to readjust it to the pressure it was originally set to so as to not overpressurize the tank. Overpressure is very dangerous so do not use the compressor until it is repaired.
Best wishes!

May 10, 2009 | Air Tools & Compressors

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