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Remove the screws from the plastic shroud on top of the compressor near the air outlet valve. Use a screwdriver to remove the screws. Lift the shroud from the compressor to reveal the upper and lower pressure limiter adjustment screws. The screw closest to you is the lower, the one farthest away is the upper.
Turn the compressor on and allow it to charge. Make a note of the pressure on the pressure gauge when the compressor turns off. Pull the air release valve to release pressure from the tank. Look for a metal and plastic valve near the air outlet with a metal pull ring through it. Watch the pressure gauge and make a note of the point at which the compressor turns back on.
Consult the tool manual or tool manufacturer's website for the tool you use most often. Look for the optimum pressure range. You may also find this on a printed label on the tool itself. It should indicate the best pressure for operating the tool, for example, "Works best @ 60-120 psi." Psi, which stands for pounds per square inch, is the same measurement you wrote down from the pressure gauge.
Adjust the lower limiter control screw by turning it clockwise to increase the pressure, or counterclockwise to decrease it. Adjust the upper limiter control screw in the same way. Recharge the compressor, noting when it kicks off. Release pressure and note when it kicks on. Adjust the screws as needed until the compressor consistently maintains optimum pressure.
Replace the shroud on the compressor. Replace the shroud screws and tighten them with a screwdriver.
Before you change any parts, check that the pop valve is not faulty. Look closely at the pop valve to read set release pressure. If the valve is releasing before marked reading, replace valve instead to one slightly higher. The pressure may or may not be adjustable at the switch (need to replace the switch) depending on switch installed at the factory (parts list does not give enough information). If your switch has a remove-abel cap with adjustment screws/nuts, post again with model number of switch for info on adjustment. Good luck
The right guage is the actual tank pressure. The left guage is the pressure for the air hose. If you turn the adjustment dial the air pressure guage on the left will go up or down. You should be able to go to the dewalt website and find an owners manual for this compressor. I personally own this compressor and it is a good one.