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

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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 pressure (130?)

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  • cabinetman54 May 11, 2010

    Has it done this from day one? If it has, sounds like the pressure in one tank is being used to fill up the air hose. As long as the compressor keeps up with you, I wouldn't worry about it. Cabinetman54

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How do you know one tank drops to zero unless you have a pressure gauge on both tanks sounds unlikely unless you are looking at the gauge on the pressure regulator

Posted on Nov 27, 2009

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Posted on Jan 02, 2017

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2 Answers

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

Jun 11, 2015 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Ec12. Runs fine. Tanks fill fine. Just run out of air when using large volume items. i. e. framing nailer, filling tires. Like its taking too long for air to get from tank to end of hose. Almost like there...


You are correct in suspecting the regulator. Easy fix however. Remove the safety pop valve and install a tee fitting. Reinstall the safety on one port and install a quick-connect fitting on the other port. Now you will have access to full tank pressure when you need full power. In the process of regulating pressure, the 1/4 inch port size adjustable regulator will restrict the air volume. A 3/8 port size (larger air regulator ) is less volume restricting however more expensive. You can install a 3/8 port size regulator on your compressor in place of the small one installed now. Other possible trouble areas are too small inside diameter air hose , too long of a hose and air hose that has inner liner torn and is restricting airflow. Good luck

Apr 15, 2011 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

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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Air leaking from oil fill tibe


Your check valve is stuck open allowing the air in the tank to flow back into the head. It's usually located on the tank side and can be disassembled and cleaned
Just follow the largest hose from your compressor to the tank and you will see it.

Mar 24, 2010 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Draws too much current


It sounds to me like the check valve is leaking. This valve is located at the tank where the line goes in from the pump - it is supposed to keep the air from flowing from the tank back to the pump. If it leaks, it will hiss out of the unloader but make create enough back pressure to keep the pump under enough load to overload the motor upon start-up. Sometimes you can remove this valve and simply clean it. Just make sure you bleed the tank down completely before servicing. I hope this helps.

Jan 18, 2010 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

I have a Hitachi EC12 Portable Electric 2hp Air Compressor. It builds air pressure fine and shuts off normial. But if I attach a blow nozzle or another attachment to the hose and try and use it, the...


This is a stab in the dark.....but have you emptied the condensation out of the tank? It may reach max pressure....but have little air compressed inside the tanks. Just a guess.

Dec 13, 2009 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Do not have manual for hitachi ec12 air compressor, cannot increase pressure


You have to manually adjust the pressure regulator. Make sure drain is completely closed. The one thats on the bottom of the tanks

Aug 29, 2009 | Hitachi EC12 Portable Electric 2hp Air...

3 Answers

The air tanks fill with air, but the pressure


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).
Hope this helps....now go make something!
Best regards, --W/D--

Jul 18, 2009 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

No air pressure at the hose


It sounds like you have trouble with your pressure regulator. Make sure that the knob for the regulator is turned clockwise to increase pressure. If this doesn't work, you may need to replace the regulator.

May 24, 2009 | Hitachi EC12 Portable Electric 2hp Air...

2 Answers

Hitachi ec12 motor hums after drop in pressue


There should be a pressure switch adjustment under the cover of the switch remove the cover and reset.

Feb 03, 2009 | Hitachi EC12 Portable Electric 2hp Air...

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