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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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

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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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