Question about Dewalt D55140BN Heavy Duty 2 Inch Brad Nailer/1 Gallon Compressor Combo Kit

1 Answer

Compressor comes on and hums and goes off and does it again, ?

My compressor will come on and run and fill the tank, then it will keep trying to come back on and it makes a loud huming noice. It will keep doing this until I unplug it.

Any thoughts
Thanks!!!
John

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  • 1,378 Answers

The fact that your compressor completes a cycle indicates that the motor and pump are probably working correctly, however when the pressure switch cycles off there should be a slight release of the air that remains in the airline. If this air is not released thru the unloader of the pressure switch the motor cannot overcome the back-pressure in the airline and just hum. There should be a 1/4 in. hose extending from the pressure switch to the checkvalve in the tank. There is a small tab and needle valve that releases the air. Also check that the tank checkvalve is not leaking air back into the airline as this would cause back pressure. Finally, failing motor start capacitor will cause motor to hum. Weak capacitor will start motor when cold and no pressure in tank, but when things heat-up and with pressure in tank, motor may not have enough power to overcome load and hum. Enjoy

Posted on Dec 12, 2008

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