Question about Coleman CP0302013 20 - Gallon Portable Compressor

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Coleman 5Hp Compresser

The compresser will start at low pressuer ands go to peak but it wont restart again at 85psi. all it does is hum

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  • jjmerritt Dec 02, 2008

    I have fix the compresser and the problem was the spill valve on the Pressure switch. I have made some modefication and it now works Thanks for you help


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All electric compressors share a basic design with ac power pressure switch with unloader and checkvalve between the pump and the tank. When the pressure switch powers off, it unloads the compressor by releasing the air in the discharge hose. You will notice a small tire stem pin and a lever to engage it somewhere on the pressure switch. If the compressor stops before reaching set cutoff point, the air pressure remains in the discharge hose not allowing the motor to start, thus the hum you hear. Solution is to check for the proper function of pressure switch /unloader, tank check valve (if check valve leaks air back to compressor it will load motor causing hum) and extra measure check capacitor for at least 90% of rated valve. Finally, do not run this compressor with an extension cord, use more hose instead. enjoy

Posted on Nov 29, 2008

  • brian
    brian Nov 04, 2013

    what do you do to unload the motor so it will start again and were to I get a new pressure switch?


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