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

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It runs but doesn't build pressure.The tanks are closed.

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Mine does this too its new right out of the box i added the oil it came with and plugged it in. but will not cycle and actually pump air. i has once i allowed it to sit and run for almost 30min and then it just clicked over and started to pump filled up both tanks in maybe a minute but the engine was red hot at that point. i know something isnt right.

Posted on Feb 28, 2010

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Piston rings gone maybe or a blown gasket strip the cylinder off and inspect and get back to me buddy

Posted on Sep 26, 2009

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Posted on Jan 02, 2017

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1 Answer

My WL611103AJ builds to 60lb. Motor n pump still runs, builds no more pressure. Fells like air might be leaking under piston.


can be a gasketproblem, As the last option if the kevlarring on the piston is worn pos 7 replace that kit, but if it should so and it must replace use allways some extra copper fat or molykote equivalent , only do this repair as the last option in high priority in almost al cases by compressors if the is no pressure build up its almost allways first to control the checkvalve to the tank it is somewhere between the tank and cilinder is having a problem when thats not closing then the tank has no valve to build pressure up i think pos 12 is having first priority if something is broken from the valve plate or because of oxidation somewhere sometimes it can be insite the check valve
Repair Parts for the Campbell Hausfeld models WL611103AJ WL611003 WL611200...

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91 oldsmobile custom cruiser will not start, did test and we get spark. The fuel pump continuously run when key is turned. Have replaced fuel pump relay. Next suggestion was to replace ecm fuse - but...


The bigger question here is whether or not the fuel pump is delivering fuel when it runs. Fuel pumps work on pressure. Once the pressure builds up in the fuel lines it will shut off until the pressure drops, then it turns on again. The fact that your pump doesn't turn off suggests that either it's not pumping any fuel out of the tank or it's not building any pressure. First thing to do is make sure there is fuel in the tank. It's possible your fuel guage has stopped working and is giving a false reading.Start looking for gas leaking under the car. A leak that let's the pump run continuously should leave a very visible wet spot. Look at the top of the tank as best you can too. Loosen the fuel line at the throttle body and see if you have pressure there. Maybe it's pouring fuel into the engine and creating a flooding condition. The fact that it runs continuously would suggest the problem isn't the filter. If the filter was plugged it would build pressure. If you can't find anything here I think you are going to have to drop the tank and start looking in there to see why it isn't picking up fuel, possibly replacing the pump. Hope this helps.

Jun 11, 2011 | 1991 Oldsmobile Custom Cruiser

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I have a 1/2 hp sta-rite well pump that only produces about 40 psi through my pipes. The problem is that there is a 40/60 switch on it so it constantly runs because it doesn't build enough pressure to...


You probably have a bad pressure tank. The pressure tank bladder can develope a leak internally nad become saturated with water which won't allow it to provide cushion for the pump to gain and maintain pressure. It could also be that there is little or no pressure in the tank. Check your pressure and add to at least 40 psi. If this helps , but doesn't totally cure your problem, you have a bad tank.It could also possibly be a bad check valve but, you would probably lose all of your prime.

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1 Answer

My compressor runs and builds pressure but, with nothing touched all of a sudden does not produce the same amount of pressure as before, it will not run my printing machine. What should I check?


Does the compressor have enough CFM to run the printing machine. Will the compressor build up pressure and shut off if you close the discharge valve at the tank. Your printing machine may simply be using to much air. If the above items are not the case you may have a faulty check valve in the receiver tank or valves going bad in the LP or HP heads. The valves may also simply have carbon build up or dirt of some type not allowing the valves to seat properly. I would start at the check valve. One way to check the check valve is to see if you have air blowing from the bleed off line at the pressure switch all the time. Another way to check is loosen the fitting at the High Pressure head an see if you have air blowing continously. Caution do not remove the fitting at the head completely. If the check valve is bad you will have high pressure air blowing until the receiver tank is drained.

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1 Answer

Runs but no pressure


It will sound silly, but do you have pressure relief valve closed, and do you have your tank valve closed also. Check yhem first.

Feb 21, 2010 | Air Tools & Compressors

1 Answer

Dewalt d55141 Builds only 45psi


Check the unloading valve. Accumulation of dirt might be preventing the valve to fully close, by-passing a portion of the compressed air.

Jun 07, 2009 | Dewalt & 2HP Hand Carry Heavy Duty...

1 Answer

Coleman powermate compressor doesnt hold air


CHECK YOUR TANK PRESSURE ADJUSTMENT KNOB ON TOP A LOT OF TIMES THERE NOT SET AT THE FACTORY.HOPE THIS HELP'S

May 22, 2009 | Coleman Powermate 11 Gallon Air Compressor

1 Answer

Pressure will not build up in the tank and the silver tubing gets extremely hot.


There is a moisture release valve under the tank that may have been left open. If so, close it and the pressure will build. The reason the tubing heats up is because it is running so long.

Sirwriter

May 17, 2009 | Stanley Factory Reconditioned Bostitch...

1 Answer

Tank will not build pressure beyond 25 lbs. Just runs


IS YOUR AIR FILTER CLOGGED. SOUNDS LIKE THE VALVES IN YOUR HEAD ARE NOT CLOSING ALL THE WAY. THEY ARE MOST LIKELY REED VALVES, THIN STRIPS OF METAL THAT OPEN AND CLOSE WHEN THE PISTON MOVES. MAKE SURE THEY ARE CLOSING ALL THE WAY (NOT CARBONED UP). DID YOU REMOVE THE HEAD AND DID YOU PUT BACK LIKE YOU FOUND IT - NOT TURNED OR FLIPPED OVER. SEE IF YOUR FINGER WILL GET SUCKED UP TO THE INTAKE HOLE.

Apr 12, 2009 | Craftsman 3 gal. Air Compressor, 1.5 hp,...

1 Answer

Compressor runs hot and won't build pressure


THE COPPER LINE IS SUPPOSED TO GET HOT, SCALDING HOT ACTUALLY. THE MOST COMMON REASON FOR COMPRESSORS NOT BUILDING PRESSURE IS CLOGGED AIR FILTER OR THE VALVES IN THE HEAD ARE BROKEN OR NOT OPENING AND CLOSING CORRECTLY. YOU MAY POSSIBLY HAVE A BAD AIR LEAK DOWNSTREAM BUT YOU CAN CLOSE THE DISCHARGE VALVE ON THE TANK TO ELIMINATE THAT PROBLEM. HOPE THIS HELPS OR GET YOU STARTED.

Mar 27, 2009 | Campbell Hausfeld Air Tools & Compressors

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