Dewalt DD55141 Compressor will not stop at desired pressure!

by Daniel
(Washington)

I have a Dewalt DD55141 Compressor that is supposed to stop pumping at 150psi. It worked fine for about a year, until the warranty expired, then it started acting up. When the compressor hits 150psi, it keeps pumping, subsequently blowing the relief valve, and filling the tank again, over and over and over again. I looked for an adjustment screw, thinking it may have vibrated loose, but have yet to find one. Am I missing something? Thanks for an help!


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Bill says...

Your air compressor symptoms suggest a pressure switch failure.

The pressure switch should toggle the power supply to the air compressor motor to OFF when the pressure in the tank reaches the normal cut out pressure.

I wouldn't use this compressor again until I replaced the pressure switch.

Cheers,

Bill

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Aug 29, 2017
Dewalt DD55141 Compressor
by: Bill

"Clearly it's a regulator switch of some sort." What I understand you mean by this is that something on the compressor is not "reading" the pressure in the tank properly, and as a result, the compressor runs past the normal cut out, and eventually blows the PRV. Is that correct?

If so, the regulator you refer to is the pressure switch. I said "The pressure switch should toggle the power supply to the air compressor motor to OFF when the pressure in the tank reaches the normal cut out pressure. I wouldn't use this compressor again until I replaced the pressure switch."

I stand by this. If power is still passing the pressure switch when the tank pressure reaches the normal cut out, then it is the pressure switch that has failed, and you need to replace it, whether that's helpful to you or not, it's what needs to be done.

Aug 29, 2017
Same problem Dewalt DD55141 Compressor
by: Anonymous

Bill. That's really not helpful.

Clearly it's a regulator switch of some sort. I'm having the same problem, but there is no obvious adjustment screw or antrhing that shows the pressure setting.

Mine is also a couple years old and has only just started doing this, it pumps well past the 150psi point and stops around 165psi or it blows the relief valve, or sometimes it stops at 165, then blows the valve a few seconds later.


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DeWalt air compressor won't build pressure

i have a dewalt compressor model # d55146. the motor runs good but does not build pressure. Whats up? jerry

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Bill says...

Jerry, sorry you are having the problem with your compressor.

On these pages I posted a bunch of things that you could check to make diagnosis a lot easier for you, and my input, perhaps, more useful.

I have no idea what you checked after reading the page.

Could you maybe post a comment here to say what you have already checked, and more details about the state of the compressor when the pressure stops building, so I could help you zero in on the cause?

Thanks,

Bill

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Dewalt compressor wont stay running.

by Jim
(TN)

Dewalt 4 gallon compressor wont stay running.

Theres no particular psi it stops at. It tries to restart after a moment or two but only turns the piston over once then keeps trying every few moments. Its definitely getting plenty of power.

Thanks, Jim

______________________
Bill says...

Jim, unplug the compressor and drain the air. Close the drain.

Pull the cover off the pressure switch (careful, live wires inside) and then start the compressor.

See how the switch reacts when the pressure gets to the normal cut out level or when the compressor just stops and tries to restart.

If is is the switch that is turning the power to the motor on and off, then I suspect it is the switch that is failing.

Cheers,

Bill

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Oct 24, 2014
What else?
by: Bill

Jero, it would be good to know what pressure the compressor got to as it blew out the gauges.

I suspect that pressure was well past the normal setting for the PRV, the device that's supposed to prevent your scenario from happening.

I don't know the model of your compressor so I can't even begin to check, but you check your manual and see what pressure the PRV was supposed to crack open at, and if the pressure in the tank got past that, change your PRV too!

B.

Oct 24, 2014
compressor blew out the gauges
by: Jero

I have a Dewalt compressor. The pressure increased to a point that it blew the plastic and needle out of the gauge. I assume I need to replace the pressure switch along with the gauges. What else should I replace?

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