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

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My new EC12 has never run, only hums.

Is it just a piece of junk?

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  • Vitaman Apr 06, 2009

    Unit starts, sounds as if it is building pressure, but no movement on pressure dials. We are using it to build a tree house up on the top of our property. We have connected several 100 FOOT extentions cords to get power to the site. I suspect that the power drain is affecting performance. However, my Mitre saw. 10.5 table saw, etc is not affected. What do you suggest?

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  • 70 Answers

Try an outlet closer to the electric panel I have had the outlet wire size to small and far from panel and unit only hums let me know if this helps

Posted on Feb 23, 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

My ec12 runs for about 5 to 10 seconds then pops the circuit breaker


The EC12 actually draws approximately 15.5 amps when starting, so you are best served to use without extention cord on a 20 amp circuit. One thing that will improve operation, is to use 5w-50 full sinthetic oil. Fill to notch in dipstick. If possible change your overload switch to a 20 amp. It is currently a 15 amp. (cause right there for continual overload). I unplugged my reset button and added a piece of #12 coated wire as a jumper (do this at your own risk), but I've been fine for three years now. #12 wire fits right into the clips that attach to the reset button. Good luck.

May 25, 2014 | Hitachi EC12 Portable Electric 2hp Air...

2 Answers

What type oil does the Hitachi EC 12 use? Ray


SAE 5W50 and if available use full synthetic.

This link will take you to the EC12 owners manual if you would like.

http://www.hitachipowertools.com/product/files/pneumatics/compressors/EC12__OM.pdf

Oct 28, 2010 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

My Hitachi EC12 builds pressure, shuts off, then air escapes


I have the same compressor with the same problem. I have temporarily eliminated the thermal reset with a piece of 12 gauge hard wire and it runs just fine. However, I do want to replace it before the warm weather come to the north. I tested the draw at 15.5 amps and the reset was a 17 amp. I am told by someone with superior electrical background that I need to install a 20 amp thermal reset in it's place. I have found that mine runs best when plugged directly into a 20 amp circuit and when using an extention cord I have a 10 guage cord that will carry the load needed to run the EC12. I have also changed to 100% synthetic oil.

May 15, 2010 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

EC12 that fills fine, pressure switch kicks off, but then seems t


I have the same compressor with the same problem. I have temporarily eliminated the thermal reset with a piece of 12 gauge hard wire and it runs just fine. However, I do want to replace it before the warm weather come to the north. I tested the draw at 15.5 amps and the reset was a 17 amp. I am told by someone with superior electrical background that I need to install a 20 amp thermal reset in it's place. I have found that mine runs best when plugged directly into a 20 amp circuit and when using an extention cord I have a 10 guage cord that will carry the load needed to run the EC12.

Mar 15, 2010 | Hitachi EC12 Portable Electric 2hp Air...

5 Answers

I have a Hitachi compressor EC12. Sometimes when


you may have some water build up pull the cover apart look at yor pistons for build up

Jan 07, 2010 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

My EC12 has an intermitting hard start up problem. It will blow a 15 amp circut so I always make sure it is on a 20 amp circut and no extension cord. It will hum and even sputter a revolution or two but...


Single phase motors use a start capacitor and a start switch (that is internal to the motor) for start up of the motor, if either one is not working it will cause this problem, I would advise you take it to a motor repair shop to have it checked out.

Dec 16, 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...

1 Answer

Hitachi EC12 Compressor- weird hum


The burst of air you hear as the compressor shuts off is the cylinder unloading so it will not have to restart against a high pressure load. If the unloader is electrical it would explain the hum that you hear. This could be a normal function.

Aug 24, 2008 | Hitachi EC12 Portable Electric 2hp Air...

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