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Air Compressor will not build up over 25 PSI

-My air compressor runs and sounds great, but it only-builds air to 25 psi but no more. I checked the cylinder, piston, and rings and everything looks perfect. The only thing I noticed was that when the compressor is running air blows out a small hole located at the top of the oil fill plug, which I believe is done by design. The compressor will maintain 25 psi on the gauge overnight with no bleed down and it does not shut down since it doesn't ever build up enough pressure. Therefore, it runs continuously until I shut it down manually.

Please Help!

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  • muslehsammy Jun 14, 2009

    Thanks for your reply, but the pressure switch is fine, and the compressor does NOT ever shut off because there is never enough presure to engage the presure switch.

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  • Master
  • 867 Answers

Your max pressure switch is faulty, and shutting off the power early. replace switch, check owners manual for location(should be near power wires)

Posted on Jun 14, 2009

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mrhappyface
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SOURCE: Mastercraft 2.0 hp air compressor will not build up over 25 psi

sounds like a bad or broken valves in the head. crankcase needs a vent which is sometimes a small hole drilled into the oil fill plug and will normally blow some air out the vent while it runs

Posted on Mar 23, 2009

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Mastercraft 2.0 hp air compressor will not build up over 25 psi


sounds like a bad or broken valves in the head. crankcase needs a vent which is sometimes a small hole drilled into the oil fill plug and will normally blow some air out the vent while it runs

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