Question about Northern Industrial 2 Hp Twin Tank Electric Air Compressor

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Not pumping up to capacity, motor and compressor working fine,

The tank does not get up to full charge of about 115 psi. this is a four gallon, twin tank design. Oilless, compressor. My pressure gauge pumps up to desired psi directly off the compressor unit. check valve/

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  • Samuel Charles Spriggs May 11, 2010

    I assume the motor is shutting off before the tank gets to 115 PSI -- is that correct?



    Have you checked the pressure switch? It should be set to come on at something like 90 PSI and off at 115 PSI. It could be that it's out of calibration and shutting off too soon.

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If your pump is shutting off before it reaches it's max psi. then you need to adjust you switch. Under the black case there are two adjustment screws. One is the high\low adjustment, the other is high pressure cut off.
The first will change when the pump turns on and off for your low psi setting and the high setting simultaneously.
The second will allow you to raise or lower just the high setting. There should be a diagram under the black cap to show which is which. Adjust the high side only and just a 1\4 turn then run the compressor and see if that takes care of the high setting.

Posted on Jul 29, 2009

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