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Hittachi ec12 buzzing noise - Air Tools & Compressors

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Possible bad capacitor or motor but need more info

Posted on Dec 30, 2013

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The e t c is buzzing what is causing this


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1 Answer

Hitachi EC 12 2hp Air Compressor. Just get a buzz sound when plugged directly into 120v wall outlet. Piston and shaft turn freely. Have installed a new pressure switch. Just turned the compressor on...


Hitachi EC12 Air Compressor Parts : MASTERTOOLREPAIR.COM

Here is a site that says:
1. Are the capacitors good? (They get the motor going).
2. If they are, replace the stator, ($245)

If you don't find a good solution there, I would try taking it to a local motor rebuilder.
Gary

Dec 14, 2010 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

I started my air compressor for the first time without any oil. Now it makes a buzzing noise. Is there a "simple" solution other than replacing the motor?


Running compressor without out oil generally will damage rod and deposit metal on crank lobe. Metal can be removed using 400 grit sandpaper cut into one inch strips pulling back and fourth untill lobe is clean as new. You will only need to buy the rod(about $20) and one sheet paper. Remove pump/motor from frame, remove two bolts holding cylinder to body and airline and pull up on cylinder to expose piston/rod. Usually the rod will slightly coat the crank with metal and seize. Remove or work rod off lobe. Clean crank area and add fresh oil. Parts available at www.toolpartsdirect.com Good luck

Sep 25, 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

Hitachi EC12 plug it in and nothing happens. No noises....nothing. There is oil in the compressor and pump is moving freely.


Sure the outlet you plugged into is working, do not use an extension cord.

If there is power, then there is a black box, where the cord enters the unit., in here is the pressure switch, it tells the unit to work,
unplug the unit open it and see if the plate with the spring moves freely
and then try it again, if not you probably need a new one, I would contact
the company and see if there are problems with the unit and see what they will do for repair, or they might have a better option for troubleshooting this unit.

Feb 12, 2010 | Hitachi EC12 Portable Electric 2hp Air...

2 Answers

Lost my ec12 manual in a flood out need to replace it


can get manual from where you purchased the unit if purchased new http://www.toolpartsdirect.com/cgi-bin/schematic.cgi/hitachi/EC12

here you will find a parts manual

Jul 10, 2009 | Hitachi EC12 Portable Electric 2hp Air...

1 Answer

Hatachi EC12 Portable Compressor When I start the


well make sure air pressure is not too high. if not just replace it any air supply house carries them

Jul 02, 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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