Question about Craftsman 15 gal Air Compressor 3 hp UMC Horizontal k Oil Free Pump

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I recently changed the check valve and regulator on my air compressor...I notice now that I can't get the pressure past 60 and the air compressor just runs and runs...never shuts off unless I shut it off manually...what do you think the problem is???

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  • chuck bogorae Apr 05, 2011

    could not understand the rambling thoughts of this "expert"...he jumped from one topic to another...

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I do not think that the changes you made are responsible for this problem. I feel it is more likely the pressure relief valve that has taken to leaking and dumping the pressure limiting you to that 60 psi or it could be the pressure switch that has a leak on the sense or pressure relief line. Whatever the reason, I think a thorough going over the machine's fittings and components with a soapy solution and a paint brush is in order to locate the leak so that it can be repaired. Good luck.

Posted on Apr 06, 2011

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If you recently replaced the regulator and you have now air leaking any where if the check valve is free and the regluator is good and it would be leaking if it were defective . Then it would have to be the pistion its a dry pump correct .What dose the tank pressure gauge read you should still be able to regulate between the tank and the output gauge even if the pistion were leaking Try disconnecting the regulator and adapting a peice of pipe then a pressure gauge to that and see what the compressor out put is. And look for air leaks these things are loud and sometimes its hard to notice them so feel all around the mechine when its running because unless you have a massive amount of hours or it it shouldn't be a pistion problem

Posted on Apr 04, 2011

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1 Answer

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2 Answers

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