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

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Compressor won't fill with air

Installed new pressure switch and compressor runs, makes air, but will not fill tanks or build pressure

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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22yooper
  • 828 Answers

SOURCE: 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.

Posted on Sep 09, 2008

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  • 59 Answers

SOURCE: ec12 hard restart after drop in air pressure

It sounds like the air pressure assembly unit is not reading the pressure drop. some of these units have adjustments under the covers and be reset.

Posted on Sep 18, 2008

  • 1 Answer

SOURCE: My EC12 builds up pressure, but then releases all but about 10 psi.

The non-return valve is sticking and it's an easy fix. First, for safety, unplug the electric power to the unit and release any pressure in the tanks. Then unscrew the cap of the non-return valve (between the compressor and the tanks). Inside you should find a tapered rubber plug which is probably sticking in the valve housing. Sand down the diameter of the large end of the plug, being careful not to damage the flat face at the narrow end (which is the sealing surface). For sanding try 400 or 600 grade wet-or-dry paper and sand until the plug just moves freely in the housing. Reassemble and the compressor should work. Incidentally it's an oil-type unit, and quite durable. Make sure it has enough oil.

Posted on Nov 14, 2008

  • 1388 Answers

SOURCE: pressure switch out of adjustment

Before you adjust the perssure switch, make sure that the intank check valve is not leaking pressure back to the pressure switch after it cuts off at 140psi. The check valve should hold pressure at 140psi. Follow the discharge airline to the tank to find the checkvalve (either chrome or brass with large cap). To check for leaking valve, run compressor till shut-off at 140, then unplug the compressor from wall and remove the 1/4 air fitting at the checkvalve and check for leak. If leaking, replace valve and leave the pressure switch at present setting. You should be good to go. Good Luck with your repair and email if you have questions.

Posted on Apr 04, 2009

  • 89 Answers

SOURCE: compressor runs fine builds up pressure then will

PRESSURE SWITCH IS BAD. NOT ADJUSTED CORRECTLY, POINTS ARE STUCK/WELDED TOGETHER OR THE NIPPLE UNDER IT IS CLOGGED. DRAIN PRESSURE AND REMOVE PRESSURE SWITCH. KNOW YOUR UNITS PSI AND TAKE THE SWITCH WITH YOU TO MATCH. IF YOU WANT TO INVESTIGATE FURTHER BEFORE YOU BUY, LOOK IN THE SIDE OF THE SWITCH AND YOU WILL SEE THE POINTS. THEY SHOULD BE TOUCHING WHEN ITS SUPPOSED TO RUN AND SEPERATED WHEN ITS SUPPOSED TO CUT OFF. HOPE THIS HELPS, JODY

Posted on Apr 20, 2009

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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

My dewalt D55146 makes loud leaf blower noise, has a burning smell and doesnt build pressure


This compressor is belt driven. When the belt fails the motor will run faster than normal and takes longer to stop turning. When belt is in place and the motor is shut off, the motor will stop almost instantly. If the belt is slipping, you will smell rubber burning (you will need to change the belt anyway). It is my opinion that the belt fails because the cut-off pressure is much to high (200psi). The belt will last longer is the pressure switch cut-out at a normal 125psi. If the discharge tube (tube from pump head to tank or in-tank check valve) or other parts are leaking, it will take much longer to fill and cause over-heating. You can keep track of the condition of the compressor internal parts by knowing how long it takes to fill the tank when new compared to how long it takes now. As parts wear, the unit will take longer to fill. Go to the dealer and time a new unit then test yours against this time period. Do not use an extension cord on this size compressor. Use more hose instead. If you are having trouble filling the tires because of low pressure in the hose, try experiment. Remove the safety valve from the compressor and install a tee fitting. One one port of the tee, reinstall the safety valve. On the second port install a quickconnect fitting. This will give you access to full tank pressure bypassing the regulator to quick fill your tractor tire. This trick is how the tire shop quickly fills a tire. Use caution and do not overfill your tire. Good luck

Apr 11, 2013 | Dewalt D55146 Heavy Duty 412Gallon 200PSI...

2 Answers

I have a porter cable compressor, but the pump won't shut off, and the pressure won't build it


Hi

Here are a few things to check, you may have already checked some of these.

*Electricity...Compressors will run best with full 115Vot 15AMP/Or 220V electrical supply from a circuit, over the shortest electrical cord as possible.

*Air Leaks..Place your ear close to the compressor and listen for air leaking, if you hear air that is not normal and means you have to locate and repair whatever it is that is leaking.
*Check the air unloader valve... The air unloader valve will blown out air when you turned off the compressor, that is normal.
But it should not have air leaking out of it all of the time. If so then it is faulty and in need of repair/replacement.
*Valves...If either the intake or exaust valves fail, breaks, or fails to seat, then your compressor will run 24 hours a day and never build up to the correct pressure for shut-off.
*Gaskets...Check to see if your gaskets have failed.
You could have a gasket failure between the pistons and you will never know it because it shows no external air leak.
If this situation happens then the air will only cycle between cylinders and never build up the correct air pressure.
One way to check the gasket is remove the air filter, then put your hand over the intake.
If correct then it will **** you hand against the intake.
If the valve or valves have failed then you will feel the air sucking in and blowing out.
*Piston Rings and Cylinder...The piston rings could be stuck,broken, or worn and not allowing the correct pressure to build up in your tank.
A worn cylinder will also contribute to the problem of pressure build-up.
*Pressure Switch...Check for air leaks at the pressure switch, it has a rubber diaphram that can fail and leak air out of the system.
Please take time to rate me
Bud

Nov 01, 2012 | Porter Cable Air Tools & Compressors

1 Answer

Won't build top pressure an shut off


It sounds like your pressure switch is not set correctly. It is possible it is set too high for the compressor you have.

Sep 23, 2017 | Ingersoll Rand Ingersoll-Rand 80 gal. Air...

1 Answer

My Porter Cable Job Boss compressor won't shut off. It builds up pressure but just continually runs.


Pressure switch - replace as soon as possible
Overpressure would be possible in that tank - it is dangerous !

Oct 20, 2012 | Porter Cable 4 5 Gallons 150PSI Job Boss...

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,...

1 Answer

Cf2600 won't build pure pressure. Could air intake be stopped up. Had dirt dobber stop up on older compressor. Where is air intake. Can't locate.


No there is not a filter. Since the pump is enclosed in the plastic covers there would not be a way to service it. Now if it is not building any pressure then it could be a few things. First would be the drive belt. (item 125) If it breaks then it won't pump at all. Also if the air hose that exits the pump (item 122) gets a hole in it then it won't fill the tank. A worn head valve plate (item 106), blown gasket (item 105), or a worn piston and sleeve (items 109 and 112-2) can also cause this. If the check valve into the tank (item 16) gets stuck open it too will limit how much the compressor will pump BUT usually it will build up some pressure then just keep running without building any higher pressure into the tank.

Here is a parts diagram so you can see where the belt and other parts are located plus it contains all of the part numbers.

PC CF2600 diagram

Aug 23, 2012 | Porter Cable 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

3 Answers

Compressor runs to 175psi but trips pressure relief when pressure drops tries to restart motor but motor wont turn blows breaker. changed whole pressure switch have same problem.


The problem is lilkely the check valve between the compressor and the tank -- it is alowing pressure to build from tank to compressor preventing the compressor from turning over. Clean, maybe replace, check valve...

Charlie

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

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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