Question about Campbell Hausfeld 26 - Gallon Air Compressor

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Start up problem

When I start my air compressor up cold and with air in the tank. The motor buzzes(acts as if it is bound up) and in 10-20 seconds trips my 20amp breaker. When I let the air out of the tank the motor starts up and builds pressure to 130psi. Seems to run fine with no air in the tank at start up. Please help

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  • Anonymous Feb 09, 2009

    Mine does the exact same thing. I've changed the breaker etc no luck at all.

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3 Answers

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The problem that you describe is caused by the in-tank check valve and/ or the unloader at the pressure switch. When the compressor cycles off the pressure switch releases the air that remains in the air line thru a small valve. There is a 1/4 " plastic tube extending from the check valve to the switch. Listen for the release of air as soon as the compressor stops. There is a small metal tab that pushes on the unloader valve that may need to be adjusted. The motor does not have enough power to start pumping if there is air/backpressure in the air line. If these parts are working correctly then check the value of the start capacitor and use meter to measure. The cap should test within 95 % of stated value. Parts are available at www.chpower.com. Enjoy

Posted on Dec 13, 2008

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Your compressor's un loader valve is damaged , thus cause a air buildup in line .
When start up occurs the pressure buildup causes the piston of the compressor to stick .
Solution is to renew the un loader valve . If the pressure reaches 8bar of whatever its set to it should cutout with a " hiss sound " indicating the air is unloaded from the system and release the pressure from the compressor pistons to start new with no pressure strain on the motor .

Posted on Jun 16, 2009

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YOUR IN TANK CHECK VALVES ARE BAD. THERE IS AIR TRAPPED ON TOP OF YOUR PISTON WHEN IT IS TRYING TO START UP. DRAIN TANK AND REMOVE THE BRASS VALVE WHERE THE AIR GOES INTO THE TANK FROM THE HEAD (FOLLOW COPPER LINE). THERE IS A PEICE OF TRASH OR THE SEAT THE DISC SEALS ON IS DAMAGED. PART SHOULD COST $10.00 - 20.00. TAKE THE OLD VALVE WITH YOU TO MATCH SIZES. WHEN THE COMPRESSOR CUTS OFF AT FULL PRESSURE YOU SHOULD HEAR IT UNLOAD THE TRAPPED AIR.

Posted on Mar 20, 2009

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