Question about Craftsman 20 gal Horizontal Compressor

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Pratically new craftsman dry pump air compressor will not reach shut off pressure, reaches 100 and will not get higher it just continues to run.

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  • Master
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The compressor valves may require replacement, the drive belt is loose, or there is a leak somewhere on the tank--usually the safety release valve. Hope some of this helps!

Posted on Oct 16, 2010

  • Producer Nov 12, 2010

    may have a broke leaf valve inside the head - take it apart and inspect the valve plate. If the intake valve is broken you'll see it. Replacement costs about $17 from Mel-Co parts on eBay - or $27-$40 elsewhere.

    I had the same problem with my older model (1993) Sears air compressor

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Posted on Jan 02, 2017

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1 Answer

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I just purchased a used pro source 10 gal. It don't shut off is that normal? I see it says 2.0 continuous. So that mean as long as its on it runs.


The rating of 2.0cfm continuous means that your a/c can produce that much air at certain pressure as long as it runs. It should shut off when it reaches cut-off set pressure. If it does not reach say 125-145 psi and shut off then mostl likely air is leaking from joints or piston/cylinder worn out. Spray soapy water on joints and look at top part of cylinder from under side of pump and look for scratches. If scratched, air is leaking past cyl/piston. Good luck.

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Compressor runs to 175psi but trips pressure relief when pressure drops tries to restart motor but motor wont turn blows breaker. changed whole pressure switch have same problem.


The problem is lilkely the check valve between the compressor and the tank -- it is alowing pressure to build from tank to compressor preventing the compressor from turning over. Clean, maybe replace, check valve...

Charlie

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My regulator broke and I just replaced it. Now the compressor doesn't act like it will automatically shut off when it reaches pressure (130 psi max). Last night it pressured up to right at 130 psi and...


Hi, my name is John. Welcome to FixYa. Look on the pressure switch and see what the max. is. I have some notes here I will have to locate them and I will post them here if you still having problems, but it sounds like you need to replace the pressure switch. Thanks for choosing FixYa...John

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1 Answer

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MY COMPRESSOR JUST KEEPS RUNNING AND WONT REACH MAXIMUM PRESSURE AND SHUT OFF. I CAN SHOOT NAILS BUT IT WONT SHUT OFF DOWN.


The compressor itself sound like it is bad. You might see what it cost to repair it. It might be cheaper to get another one...keep in mind if you do a lot of work with it that a 2 stage compressor will cool better and you won't have this type of problem again.

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The compressor will not auto shut off until it reaches the preset pressure which is usually around 100-130 psi - your problem is leakage of air from the oil filler cap suggesting that you have a failed internal valve.

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