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

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Hitachi compressor motor runs but it will not fill the tanks

It runs but it will not fill the tanks with air

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  • myomy40 Feb 19, 2009

    my compressor al of a sudden started making a funny noise, it then woluldn't build up pressure

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  • 65 Answers

Hi your problem could lie in one of two areas
1/your unloader valve is stuck in the unload position
2/ your valves in the compressor pump head have broken and need renewal
hope that this is helpfull any further do not hesitate to contact
cheers ian

Posted on Dec 29, 2008

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How can i fix my ec12 hitachi electric air compressor


This problem is caused by either the starter capacitor or the in-tank check valve. Ez to check. With no air in tank, start compressor; if motor hums or has difficulty suspect capacitor. If motor starts, partially fill tank and unplug the power. Check for air leaking at the pressure switch or air coming out of the air inlet (remove the air filter). If air leaking, replace check valve. If no air leaking, again let out all the from the tank and connect power. Allow the compressor to fill and shut-off. After the compressor fills, again listen for air leaking from the pressure switch unloader valve. If air continues to leak from unloader, replace the check valve. Good luck

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I just put a new pressure switch on but when i fill the tanks the compressor wants to empty the air and it tries to kick back on to fill back up with air and some times it kicks and drawls a load on the...


Air leaking from tank back into compessor is indication that in-tank check valve is leaking. This condition will stress motor when trying to start. Test : With air in tank, unplug compressor from outlet and remove hose from compressor at checkvalve and test for leak (soapy water). If leaking drain air and remove checkvalve. Examine checkvalve for debris under seat (resurface seat or replace valve). Parts are at www.toolpartsdirect.com Good luck

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My hitachi EC12 compressor starts up and fills the two tanks. When I connect my hose, the pressure in one tank drops to zero, then goes back up to about 60 psi, then very slowly builds back up to max...


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You stated that the compressor started up fine. I'll assume it reached it's max psi then cut out. Then upon reaching it's cut-in psi the motor ran slowly for a few seconds, then kicked off. I also assume you mean check valve when you refer to the non return valve.
If this sounds about right then. The first thing I would do is bleed out all the air from both the tank and the pump supply line leading from the pump head to the tank's check valve. You can do this by simply loosening the fitting that attaches the line at the head or the check valve. Once done try running the compressor again.
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If the problem reoccurs only after the compressor has reached it's max psi, then the unloader valve is most likely the problem. If however it will not start up at all even after a complete bleed then it has to be something internal to the pump and\or motor.

Please try this and let me know (or repost) your findings.
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The regulator sounds like it is cranked closed. Try slowly operating the adjusting knob in the opposite direction. As the valve moves, you should see the pressure rise on your gauge (it probably does work).
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Best regards, --W/D--

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