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

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Air tanks won't fill

Replaced pressure switch and compressor runs makes air and won't fill tanks

Posted by Anonymous on

5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 65 Answers

SOURCE: hitachi compressor motor runs but it will not fill the tanks

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

mrhappyface
  • 205 Answers

SOURCE: My hitachi EC12 compressor starts up and fills the

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

  • 1383 Answers

SOURCE: I just put a new

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

Posted on Mar 14, 2011

  • 8 Answers

SOURCE: the air tanks fill with air, but the pressure

Take the knob off there is a spring in it with a black plastic part. Most likly this is broken, look for it on eBay.this piece pushes in and opens the regulator.

Posted on Apr 13, 2013

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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

Air compressor tank will not fill?


STOP. What pressure does the gauge show? If it's higher than it should be, drain the tank and replace the pressure switch. If it's not unusually high, then replace the pressure relief valve.

DO NOT let that compressor run at too high air pressure! A burst air compressor is a TERRIFIC bomb, and can kill you before you know what happened!

Aug 04, 2014 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Stanley Bostitch compressor cpack model runs and runs but won't fill tank.


check for any air leaks and fix as needed. then look for oil coming from cylinder heads , if oil is coming from heads you have blown head gaskets ,it wont build pressure like this. you might also check the pop off valve to be blown open. push the pin in and see if air starts to build up then. If so get a new valve.also check the drain valve under the tank and make sure its closed.

Apr 17, 2013 | Air Tools & Compressors

1 Answer

Compressor runs fills tank but then it wont keep the pressure, won't restart to keep pressure above requested pressure. I have to let it seat for 1/2 hour to restart again


Most likely problem is the tank fill check valve. The most common way a a tank will loose pressure is by leak-back at the check valve. This also makes it hard to start because it leaves the tank pressure on the pump head instead of letting it bleed off. The motor will only restart after the tank pressure is bleed off to a low level, reducing the back pressure the motor will have to overcome. Leaking can be heard at the pressure switch, where the air is normally bleeds off over 10 seconds or so after the motor turns off. A defective check valve will continuously leak down at the pressure switch unloader valve instead of bleeding out in just 10 seconds. The check valve is an assembly that is largely hidden inside the tank. It just looks like a large hex nut where the filler tube from the pump enters the tank. Removal usually means first removing a smaller hex/barb/connector where the smaller relief line ties into the big nut. Inspection of the check valve will easily reveal whether this is the problem.

Oct 20, 2012 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

2 Answers

My pancake compressor runs fills air tank then ar discharges under switch


I guess you mean it leaks air from underneath the On/Off switch?

If that's correct, it sounds like the check valve is leaking. On the tank there should be a pipe that goes under that switch. At the tank end of that pipe, there is a check valve. Before you unscrew it MAKE SURE THERE IS NO PRESSURE IN THE TANK!!! You should be able to unscrew it, the check valve consists of a light spring and a plastic or rubber stopper looking thing, have a look at it, if possible clean it or replace it. Put it back together again, and try it now

Sep 08, 2012 | Campbell Hausfeld Air Tools & Compressors

1 Answer

Craftsman air compressor model 191.135131 wont build pressure


I can not find a Craftsman compressor with that model number anywhere so here are a couple things to look into. If the compressor fills to 70psi and keeps on running check the valve plate and piston/cylinder assemblies. Check that the valve reeds on the valve plate are not bent, broken or warped from heat. Then check that the wiper (oil less) or pistion rings (oil splash) are not damaged and that the cylinder wall is not scarred up. Any of these will let the compressor fill up to the point where the air pressure leaks past the valves or piston and won't fill any further. If the compressor fills to 70psi then shuts off the problem is in the pressure switch. Some have an adjustment screw or bolt to control when it turns on and shuts off. If you had a drop from 100 to 70 the springs may be weak or broke and you'll have to replace the switch.

May 22, 2012 | Craftsman Air Tools & Compressors

1 Answer

The tank fills with air, but the motor doesn't shut off. It continues to run.


Pressure switch is stuck on, dont use this until its fixed!!!!!, you could overfill the tank with excess air, it could be adjustable or the switch may need cleaning/replacing.

Mar 09, 2011 | Craftsman 25 gal Air Compressor 3 12 hp...

1 Answer

Compressor initially starts up and fills tank to 120 psi with no problem. Compressor shuts off. When a tool is used the compressor tries to kick back on but hums and won't turn pump. If the "off"...


There is a small valve on the pressure switch that should relieve the pressure between the compressor and tank check valve. Make sure when pressure switch trips, it engages the relief valve and it bleeds the air out. Sometimes the valve itself comes loose and is not engaged by the lever in the pressure switch.

Oct 30, 2010 | Campbell Hausfeld 20 - Gallon Air...

1 Answer

COMPRESSOR RUNS, FILLS TANK, AND THEN LEAKS OFF ALL THE PRESSURE. WHAT IS GOING ON?


Is the air "leaking" from the pressure relief valve? If so it is either faulty or it is doing what is supposed to do. The pressure relief valve is there in case the pressure switch fails.The tank could blow up if the pressure switch fails, so the pressure relief valve is there as a secondary measure to insure the tank does not receive too much air pressure. Assuming your gauge is operating properly, watch the gauge to see if it reaches the maximum pressure (check your manual to find the maximum PSI) or if it goes over the maximum pressure. If it goes over the maximum pressure then replace the pressure switch. If it the motor stops at the maximum pressure, replace the pressure relief valve.

Jun 07, 2009 | Dewalt D55250 Factory Recondition Heavy -...

1 Answer

Air compressor fills, but slows down as the pressure builds


sounds like you need a new check valve which should be somewhere between the compressor outlet piping,tubing,etc and the tank which prevents the air in tank to back feed to the compressor which would cause hard starting and could damage the motor easy way to check is when you shut off the compressor with some air in the tank if the check valve is bad it would continue to bleed air out out the unloader valve .the unloader valve on your unit is most likely part of the pressure switch when the unit shuts of it should only bleed down the pressure in the pump so it would make it easy to start when needed hope i didn't confuse you

Mar 22, 2009 | Campbell Hausfeld Air Tools & Compressors

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