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

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Runs and stop

Runs for 2-4 seconds and cut out

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  • juan1hector Dec 12, 2008

    my air compressor run and stops, it is poping out the safety swith every time that stops.

    I also read the prior tread to this isue but my compressro is electric as estated in the header, so the information to solve this isue is unaplicable.



  • morenoarmand Feb 05, 2009

    my compressor keeps popping out the reset switch and it takes about 30 tries for it to finnaly re start only to do the same thing over and over im at it for 15-20 miniutes before i can actually get a full load of air


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  • 120 Answers

Check fuel filter.
Remove fuel cap and try again.
Fuel starvation.
Are you at a high elevation (readjust carb. needle)?

Posted on Oct 07, 2008

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1 Answer

Air compressor starts and then shuts off

Do you mean it runs for 1 or 2 seconds and stops or it runs for minutes and stops? If it never really starts (runs for a second or less) then it is probably a capacitor start motor and the capacity has gone bad.

If it runs for minutes or more and then stops and subsequently restarts when it has cooled then the thermal overload switch is turning it off when the motor overheats. If the unit is not all that old, hasn't been run particularly hard and you have this problem every time you turn it on when it is just pumping up, (which is to say, there is no good reason for the motor to be overheated) then the thermal overheat switch is probably defective.

If the compressor is being run hard when this happens, then the unit is being overheated from heavier use than for which it was designed. If the interior of the compressor motor has a coating of saw dust or dust, it acts like an insulator and results in the motor heating more quickly than it should under normal circumstances. Also, if it is being used in a hot environment it will likewise have trouble cooling.

So, if it really doesn't run at all, it is probably the motor starting capacitor. If it happens when the compressor isn't really hot, then the thermal over-temperature switch is probably defective. If it gets genuinely hot, but without being run hard, then the motor might need to be cleaned because it is not cooling properly. If it happens when it is hot and it is hot because it has been run hard, then either don't run it as hard, cool it better or get a bigger compressor. If it is clean inside, not being run hard but still overheats, then I would look at a malfunction in the compressor portion of the unit having more friction than it should (bearings lubricated?) thus requiring more horsepower to run the compressor than the motor is designed to generate and results in overheating. Low voltage can also do the same.

Aug 03, 2012 | Coleman Air Tools & Compressors

1 Answer

Mac 5200 pumps pressure to 140lbs. then blows off pressure until 120lbs is reached. Cut in is about 115lbs. I have replaced main switch and it still does same. Tried small adjustments on mainswicth st

Check your Safety Valve. It is on the back of the tank sometimes on one of the pressure switch ports or on the air manifold. It has a ring on it to pull to relieve pressure from the tank. The spring in these can get overheated so they don't hold air unless the tank gets over 165 psi. When the motor is running hold the center pin in to see if you have the same results. If the valve holds air until you let it go, replace it.

Jan 30, 2012 | Makita MAC5200 Electric Powered Air...

1 Answer



Yes I think you may be right, it could quite well the thermal switch,"pressure controlled on/off"switch and is not properly set up, minimum and maximum stop/start.
If what I see in the photo, the pressure switch is beside the top tank with a pressure gauge on it, and the electrical supply should feed into/from it.

Hope this gives you a little food for thought, and hope that it is a little helpful


Jul 19, 2011 | Clarke Power Products AC2002A 2 Hp Air...

1 Answer

New compressor, when i turn it on it spins fast for 5- 10 seconds then slows down til it stops completely,oil is full,reset button on motor does not trip nor does my 50 amp breaker, i put voltmeter on...

Try tightening the drive belt first. As pressure builds a loose belt will start slipping and slows down . It will eventually stop if not cut off!! If this is not the problem remove the drive belt and run the motor 5 minutes or so and see if it runs OK. While the belt is off and motor not running turn the compressor by hand. If it hard to rotate it may be bad. .I have seen both bad motors and pumps from the factory on new units. It's very seldom it happens but can and has.Also look on the fly wheel. Their should be an arrow showing correct rotation. Make sure rotation is correct. since it is 1 ph it should be. If motor or compressor is bad there should be an 800 # on the tank. Give it a call or call your nearest IR distributor.You can also call the 800 # and talk with someone in tech support.

Jul 07, 2011 | Ingersoll Air Tools & Compressors

1 Answer

My air compressor makes a noise like a lawn mower traying to start after it kicks on, after about 15 or 20 seconds for about 2 seconds and then the noise stops. Dont do it all the time. It runs good pumps...

Isn't the air compressor just charging or is this a new noise that you didn't hear before. If it isn't broke don't fix it. It could be a valve that isn't opening and closing properly. Use a little pneumatic lubricant on any parts you feel confortable getting into. Don't disassemble anything unless you know how to put it back together. Pay attention to direction of valve spools.

Sep 30, 2010 | Ingersoll Rand - Rand Type - 30...

1 Answer

Need to adjust Sq D 9013 GHG2

Here are the ranges your your pressure switch.
Fluids / Pressure controlled Water or Air
Cut-0ut PSIG (bar) 60-200
Cut-In PSIG (bar) 40-170
Weight lbs (kg) 2 lbs (0.91) 2 lbs (0.91)

First set the cut out pressure turning the nut on the spring. To raise the pressure turn nut clockwise depressing the spring. Adjust this so you device stops at 110 psi. Remember when you raise the cutoutpressure the cut in pressure will also raise. When you get the cut out pressure at 110, then your cut in presure will be approx 90 psi (current 60psi +30psi you raised the cut out pressure). Now you can lower the cut in pressure but backing out the differential nut, the smaller size. Until the device cuts out aht the 80psi you want.

Jul 02, 2010 | Square D 9013FHG14J52M1X Air Compressor...

1 Answer

My compressor runs upto 145 psi before it shuts off, which is fine, but drains down to 80 psi before it kicks it, I want it to kick in around 100 or 105 psi, under the cover are two screws one is plastic...

Usually you have a screw set in the middle and one set off to the right or left. One (normally center), will adjust the cut-in and cut-out pressure, the other will only effect the cut-out. Clock-wise to raise for both screws.
I am not positive on your make of switch but it is probably a Furnas or similar brand switch.

To get the desired setting you will need to adjust both screws.First you will need to lower the "Cut-out" screw this should be the plastic screw. Turn this counter clock-wise. You will need to drop it the same amount that you want to raise the "Cut-in" pressure.
Second turn the "Cut-in" "Cut-out" screw clock wise to raise both the settings.
If you raise the "Cut-in" psi without lowering the other first you will end up with a "Cut-out"pressure of 165 psi.
Since I am not positive on the brand check your setting after your first adjustment to verify you are changing the "Cut-out" only psi. Make small adjustments, 1/2 to 1 turn of the screw.

If you have any problems please don't hesitate to ask for a clarification. Hope this helps.

Jun 09, 2010 | Air Tools & Compressors

2 Answers

EC-12 runs but only builds to 35 psi and continues to run

It looks like there might be a knob which sets the max air pressure coming from the compressor. If there is one, this may have been turned down.

There are usually 3 pressure settings on an electric compressor. Compressor max, pressure switch cut on, and pressure switch cut off.

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

2 Answers

Craftsman compressor runs for 10 sec. and shuts off.

I have a Craftsman 2hp/12 gallon Air compressor that does basicly the same thing, will start, run for about 3 seconds and stop. I replaced the pressure switch but still have the problem. Any suggestions?

Apr 08, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

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