D55141 Electric 2 gallon Dewalt Emglo compressor won't shut off. It builds pressure past the max rating 150 psi and blows the intended safety feature, pressure relief valve as it should, but then keeps on running. What was the thing that use to shut compressor off when it was working properly, and how do I fix to make operate properly again?

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)

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the pressure sensor is likely defective. How old is it? take it to a Dewalt service centre

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.

that (more than likely) is the starter, but it also may have hit a bad commutator bar... turn off power, turn flywheel 1/8 (or so) of a turn, turn on power.

if it starts, purchase new motor because the commutator/brushes are dirty or shorted.

if it doesn't, replace the starter relay.

Try examining the pressure switch first. If it's cycling on/off abnormally, it's probably the pressure switch.

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.

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

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.

Dont understand the question , does the engine shut off after p-max is met , or does it continue to run , if it continues to run then you have a pressure switch problem

Emglo airmate compressors are set from the factory to shut off at around 125psi. There is an adjustment (remove cover to pressure switch) that will controll the cut-off pressure but it is not recommended changing the factory setting. There is also a safety valve installed that will open at about 160psi. It is a small brass device with a pull ring. When things go wrong with the pressure switch (rectangular box with power cord coming out of one side) the safety will pop open. There is a pressure regulator with round knob on panel that will lower the pressure to the tool, however this regulator does not control the pressure switch. Let you compressor run untill it shuts off and verify pressure to be about 125, if it is then all as well. Good Luck