Compressor won't pump up past 120 PSIby Al I have one of these WL Model Campbell Hausfield models. 150 rated PSI with oil-less pump. Bill answers... Howdy Al... If the unit is cycling, and the air pressure can't get past a certain pressure level, and that pressure level is below the cut-out pressure set point, than your unit will continue to run until it burns out. To get a better understanding of how a reciprocating compressor works click here. If you've got no leaks, then it would seem reasonable that the air seals are worn to the point that the pressure can't get past the 120 PSI point due to blow back. So, I'm not going to second guess CH, as I think they are right. However, having said that, what tool do you have that needs 120 PSI? Adjust your pressure switch so that the cut-out pressure is 110 PSI, and the unit will work well then until the wear issue means that it can't even reach that threshold. Then, either lower the cut-out pressure again, or fix the unit. Cheers, Bill
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