Question about Dewalt 2 Hp 4 GAL Air Compressor

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Regulator will not turn

Brand new never used Dewalt 1.8- 4.5 gal compressor. Tried pushing in and pulling out just seems to be froze

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  • Dean
    Dean May 11, 2010

    Hi, have you tried connecting an air blower and have the air running through the system as you adjust it?
    Sometimes the regulators are very difficult to move if the tank is full and under pressure. You should adjust the regulator with air flowing through the system anyway to set a correct pressure, because the regulator is only measuring the pressure downstream from the regulator itself.


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I AGREE WITH EDITOR 925. ALSO MAKE SURE YOUR NOT TRYING TO EXCEED THE PSI OF THE REGULATOR OR COMPRESSOR. TYPICALLY YOU PULL THE CAP UP A TINY BIT AND TURN IT. IT MAY BE MAXED OUT ALSO.

Posted on Mar 14, 2009

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Posted on Jan 02, 2017

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Dewalt compressor builts pressure but doesn't supply hose and tool with the air


Dewalt sells a rebuild kit for the regulator (my be part # N008792). You could try lubing the internal parts before ordering the kit. With no air in the tank, remove the plastic knob assembly and pull out the small piston. In the center of the valve body will be a small brass plunger. You should be able to push this plunger in with thumb pressure. If stuck, remove the nut on the back of the valve and lube the plunger with grease (pull the plunger off the back-nut if stuck in place). Lube the piston and cylinder (black plastic piece) with grease and reinstall. The small piston has a lip seal that should point toward the body of the manafold. For emergency air, remove the safety pop-valve and install a tee fitting. On this tee fitting reinstall the safety valve on one port and a quick disconnect on the other. You can draw air out of the tank at full pressure untill you repair the regulator. Good luck

Mar 29, 2013 | Dewalt D55141 Heavy Duty 2 Gal, 150 Psi...

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Brand new compressor...air builds in tank but turning the regulator result in no change in the regulated pressure. Tried turning the regulator to make sure it moves freely, and it seems to, but still no...


The regulator has a very strong spring inside causing knob to get harder to turn as you increase the pressure (increase clockwise). If the knob is easy to turn most likely stripped inside. If knob gets tight as you turn then plunger at rear of regulator is stuck. On the back side of the manafold directly opposite the adjustment knob is a small nut housing a plunger. Let out all the air from the tank and remove the nut. Seperate the nut and plunger, lube and re-install. If the regulator knob is stripped you will need to replace the manafold or as a temp fix remove the safety valve (let out air from tank first) and install a tee fitting. On one port of the tee reinstall the safety valve and on second port install quick fitting for full tank pressure (or install aftermarket pressure regulator ).

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1 Answer

Will not allow me to regulate air. compressor kicks on and builds to max pressure.


All air compressors build pressure in the tank(s) to their maximum allowed by the pressure switch. The regulator only controls the pressure of the air available at the outlet. That's why they have two pressure guages, one for tank pressure and one for outlet pressure. If you cannot control the air pressure at the outlet then you have a defective/broken regulator. Dewalt does not make the regulator as a seperate part for their air compressors, you have to buy the entire manifold which includes a regulator to fix this problem.

Jan 31, 2011 | Dewalt 2 Hp 4 GAL Air Compressor

1 Answer

Can it be used to run spray can of psi 0f 70


you have to have a pressure regulator on it that drops the oulet pressure to 70 psi while the tank press is 120 psi or more. your can regulate the pressure you need up or down as needed.

Aug 31, 2010 | Dewalt 2 Hp 4 GAL Air Compressor

1 Answer

It only builds pressure to 70 psi.


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.

Jul 19, 2009 | Dewalt D55141 Heavy Duty 2 Gal, 150 Psi...

1 Answer

My Dewalt 2 hp air compressor will pressurize, but not let pressure out to tools. tried new hose. problem seems to be near pressure regulator/coupler area.


Yea, there is a blockage there. maybe regulator bad. Take it apart after draining tank of air. And look for blockage of some kind.

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1 Answer

Air Compressor


Dewalt recommends synthetic oil in their compressors. The dewlat part # 5130427-00 quart, and 5130702-00 for a 4oz size. Available at www.dewalt.com or their service center. I have been using the Lowes brand of synthetic compressor oil. Kobalt oil sells for about $7 and works great. If you do not use your compressor all day like I do, you can use the standard grade of Kobalt compressor oil that sells for around $3. Synthetic oil is for extreme conditions. Good Luck!

Apr 01, 2009 | Dewalt 2 Hp 4 GAL Air Compressor

1 Answer

How do you utilize the air pressure control knob.


Most air pressure regulator knobs work like a "child-proof" cap on a medicine vial.  It has a spring inside that keeps it dis-engaged from the tooth like gears inside.  To turn the knob you must first pull out or push in the knob.  You should feel some resistance from the spring inside.  As you pull, you will feel the knob seat into the "teeth" inside.  Then you can turn the knob and change the air pressure supplied.   Note:  most air regulator valves work in the opposite manner of regular water valves.  Turning the knob clockwise should increase the air pressure... counter clockwise should decrease the pressure.       I hope this solution will bring you success.   Best Regards,  Michael Mittelsdorf

Jan 10, 2009 | Porter Cable C2002 Wk 150 Psi 6 Gal. Oil...

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