Question about Chicago Pneumatic 1/4" Air Screwdriver

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I have a 21gal.125psi compressor,that will not pump up over 60-65

I put an automatic drain on it, and taped the threads w/ tefflon tape. I keeped the tape from hanging over the end of the fittings. Ifound 1 small leak, but not big enough to leak fast enougn to keep the compressor from pumping up to 125psi. Plus when I shut the compressor off it dose't leak the air pressure down.

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  • Ronny Bennett Sr.
    Ronny Bennett Sr. Jun 01, 2010

    What is the exact problem?The compressor will not pump up to 125 psi?Does it shut off?If this is the problem,there should be an adjustment in the regulator box.

  • parrill2 Jun 01, 2010

    It pump up to 60-65psi but no higher, and it does not shut off.



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Change the check valve

Posted on Jun 01, 2010

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On most compressors of decent size (yours fits this category), the shutoff and startup pressure points are adjustable. This is usually done using a pair of screws under a pretty accessible cover. The on/off switch usually goes through this cover and the smallest of the air lines will go here, too.

Run the compressor with this cover off and watch which set of contacts opens when it shuts itself off. The screw that adjusts how resistant these contacts are to opening is the one that determines at what pressure the unit will shut off.

Turn the screw 1/4 turn clockwise, bleed down the compressor enough for it to start back up, and note its pressure when it shuts off. This will help you determine that clockwise is the right direction, and roughly how much more to turn it to hit your target pressure.

One other thing to keep in mind. Many compressors have an adjustable outlet with a gauge. If you've got two gauges, it's likely one is for the outlet and the other for the tank. If you've got two gauges, make sure you're reading the right one. If you've got an outlet gauge you also have some kind of easy to use control for adjusting it without taking any covers off.

If this doesn't help, some clarification would help, specifically the make and model of compressor.

On the teflon tape, I see it applied the wrong direction frequently. Not saying this is the cause of your problem, but seems a handy place to mention it.

When looking at the business end of whatever male fitting is getting the tape (business end being the part that meets the fitting first), wind the tape CLOCKWISE. This way, when you install the fitting, the friction from the threads is trying to tighten rather than unravel your tape.

Posted on Jun 01, 2010


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