Question about Dewalt & 2HP Hand Carry Heavy Duty Electric Air Compressor

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Hi I have a Dewalt d55141 emglo contiues to run

Hi I have a Dewalt d55141 emglo compressor which does not shut off at the 150 lbs cut out point and continues to run until it blows the safety valve. It sat for a while and last time I used it it was fine. Was has happened and can I fix it? Thanks, Chris

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Wrong, no black box or cutout switch. p/o N003307

Posted on Nov 29, 2012

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

Posted on Nov 18, 2009

  • sapphireshom Apr 15, 2011

    My compressor is doing the same thing! How do you adjust the cut out pressure?

  • Ned C Cook
    Ned C Cook Apr 15, 2011

    Hello Chris,
    Adjusting the cutout pressure switch is quitesimple. This cutout switch is the black box that the electrical cord comes out of. Remove the cover and all will be told. The way it works is the a signal line runs from the tank to the box (switch) and when the pressure reaches your setting, it opens the power supply contacts. Inside you will see the adjustment screw in the box. The adjustment raises or lowers the tension that that the pressure has to overcome. Emglos are generally set at 125 psi cutout. An Osha yhing. Just turn the screw to the point of preference. Best way is to drop the tank pressure to until the compressor turns on. Cut in should be @90 psi. This easy set, turn the adjustment screw until the compressor starts at 90. Dropping the tank pressure to 90 should kick it on. As it pumps up it should cutout at 125 psi. If not, then adjust the cut out screw if there is one. Adjust it with the compressor running. As it nears cutout pressure be prepared to adjust the cutout screw at 125psi, The unit should shut off Watch the switch when the cover is off and you will see the movement as on and off does its thing. Be care around the eectrical taking care not to get the screw driver or your hands into the electrically hot componaents. Good luck. If adjusting doesn't work, The switch box needs to be replaced.Chk the signal line to make sire it is not crimped, broken, or otherwise being preventeted from getting air to the cutout switch box. Sometimes they are too long and kink when they get hot. _Ned_



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