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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 ).
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.
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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.
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!