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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REGULATOR KNOB HAS GOTTEN TIGHT. CANNOT TURN IT.


then it is damaged and will need to be replaced. but is it one where you push it in to lock and pull it out to unlock and adjust ???

Nov 25, 2013 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

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 ).

Oct 28, 2011 | Porter Cable C2002 150 Psi 6 Gal...

1 Answer

My psi is 150 and the tank turns off but my regulator pressure is at 0, this is a brand new tank and never been used before.


Hi scooterb88...
Sounds like your pressure regulator needs adjustment...
Turn the knob on the pressure regulator clockwise and you should start hearing air coming out of your hose...Once air is coming out, remove your hose and keep turning the regulator till you get to your desired working pressure normally around 90 psi...leave your pressure regulator at that setting and it will stay at that setting.
Please take time to rate me

Sep 17, 2011 | Porter Cable C2002 150 Psi 6 Gal...

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

2 Answers

Compressor won't build psi above 30,is this typical of the regulator or pump? the compressor is a 3 gal craftman about 1 yr old.


sounds like the regulator is faulty, normal running air should reach 110 psi, this will allow you to run tools...

Jan 30, 2010 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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

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