Question about Hitachi EC12 Portable Electric 2hp Air Compressor, Oil Lubricated

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Compressor runs fine builds up pressure then will not auto cut off, relief value bows off and compressor continues to run until I manuelly cut it off then back on

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PRESSURE SWITCH IS BAD. NOT ADJUSTED CORRECTLY, POINTS ARE STUCK/WELDED TOGETHER OR THE NIPPLE UNDER IT IS CLOGGED. DRAIN PRESSURE AND REMOVE PRESSURE SWITCH. KNOW YOUR UNITS PSI AND TAKE THE SWITCH WITH YOU TO MATCH. IF YOU WANT TO INVESTIGATE FURTHER BEFORE YOU BUY, LOOK IN THE SIDE OF THE SWITCH AND YOU WILL SEE THE POINTS. THEY SHOULD BE TOUCHING WHEN ITS SUPPOSED TO RUN AND SEPERATED WHEN ITS SUPPOSED TO CUT OFF. HOPE THIS HELPS, JODY

Posted on Apr 20, 2009

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I have a C2006 Type 4 Porter Cable pancake compressor which will build pressure all the way up to 150psi then cut off as it should but there will be a loud hissing and pressure drop until the cut on...


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1 Answer

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My dewalt emglo air compressor has been pumping up and cutting off but can here air escaping in the inside and when it reaches cut-in the motor just hums loud and cuts off until I bleed all air and then it...


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This is not a do-it-yourself type of repair. A machine shop, or even a welding shop could probably do this repair for you.

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What pressure is it popping off at? You might have to adjust the pressure switch to a lower setting.

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hi your problem seems to bee that your valves are either broken or not seating properly
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1 Answer

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