Question about Campbell Hausfeld 26 - Gallon Air Compressor

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High/low pressure spring settings

I have a Campbell Hausfeld 20 gallon compressor and I'm trying to find out how to adjust the high and low pressure settings. Which spring is which? Which direction do I turn them to decrease pressure settings?

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  • allen_robert Jan 22, 2009

    Thanks, but both springs are the same size. Also, clockwise on mine compresses the springs. Is it the same on yours? Allen.



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On my C-H vertical 60 gal, Isee only one adjusting screw over the large spring for the cut-out pressure. I cannot find any other type of adjustement for cut-in pressure nor than for the differential pressure. So, If I adjust the cut-out pressure say at 115 psi, the cut-in presure is decreased proportionally. That cause to have pressure dropping in the tank at 80 psi for the compressor to start. I would be able to set the cut-in pressure at 95 psi to always have 90 psi at the end of the hose considering the pressure drop of the FRL, fittings and the hose.
Any clue?

Posted on Jul 24, 2010

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Generally, the pressure switch is not adjusted more than once or twice in the life of the compressor since the discharge pressure can be adjusted with pressure regulator. However the life of the compressor can be increased if lower pressure settings are maintained. Your pressure switch was set at the factory to a setting of about 120 - 150. If your cutout pressure is higher than 150 surely lower.
STEP 1: Turn Main Calibration Screw ( center screw with large spring) clockwise to increase pressure and turn counter-clockwise to decrease pressure.

STEP 2: Turn Differential Pressure Screw (small spring) clockwise to decrease cut-in pressure and
turn counter-clockwise to increase cut-in pressure.

Differential Pressure is defined as the difference between cut-out and cut-in pressure. There should be about 7 to 12 psi difference between cut-out and cut-in.
In our shop we rarely adjust more than a couple of turns because these switches are sensitive.
Good Luck and please post again if you have other concerns about your compressor.

Posted on Jan 21, 2009

  • John Trevino Jan 22, 2009

    Yes some switches have two matching screws/springs for main calibration that must be adjusted w/equal turns, this type of switch will have a third adjustment screw for differential and are very hard to set just right. Also if your adjustment screws are the security type it may be better not to adjust it. Please provide the model # of pressure switch and I will check if your switch can/should be adjusted. This number is usually found on the underside of the cover. The model # of the compressor will not help much because I have found that the factory will use many different switches on same series. Also please advise if you are having other problems with the compressor.



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