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

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Pressure switch does not shut off unit and the

Just before the unit reaches MAX pressure and the motor shuts off, the regulator blows off the pressure and the motor has a hard time to restart tripping off the breaker. EC 12 unit

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  • fd1075 Jul 15, 2009

    Found the problem last night. There is a rubber plunger that prevents the from backing up, valve needed to be sanded for a looser fit and now the unit is working better then ever...

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Make sure your plugged directly to an outlet. no extension chords

tighten pop off valve colar
check oil / might be over filled

Posted on Jul 14, 2009

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Posted on Jan 02, 2017

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1 Answer

What possible causes have an air compressor shut down before reaching max pressure?


The pressure switch needs adjusting or replaced. The power cord is attached to this switch. There is an adjustment screw under the cover.

Nov 20, 2015 | Air Tools & Compressors

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REPLACED THE CONTROL SWITCH W/REGULATOR ON/OFF SWITCH. NOW IT RUNS BUT THE PRESSURE RELEASE VALVE IS POPPING. DID NOT HAVE THAT PROBLEM PRIOR


The pressure switch shuts the motor off when a designated pressure is reached. If you took that unit off then it wont shut off and builds pressure until the safety valve opens.

Jan 09, 2015 | Air Tools & Compressors

1 Answer

When my compressor reaches 120psi it shuts off but air comes out of the regulator. I replaced the regulator and it is still leaking air when it stops. When it reaches 90psi the pump starts again. It does...


The air is coming out of the pressure switch but the problem is the tank check valve. The tank check valve is on the tank where the large line from the pump feeds into the tank. There is also a smaller line, either plastic or copper, from the check valve to the pressure switch. When the pump shuts off the check valve is supposed to close and the pressure switch opens a valve that lets the head pressure bleed off through the small line. This lets the motor start the next time without any pressure in the head. If the check valve isn't closing properly the air will leak out as you describe.

Aug 19, 2012 | Air Tools & Compressors

1 Answer

Compressors


The pressure regulator on an air compressor is designed to let the pump motor run until the pressure in the tanks reaches their safe level. While you are using the air the pressure drops in the tanks until it reaches the level where the pressure switch turns the motor on again and refills the tanks to their rated level. The pressure where these two things happen is usually with in ten psi above or below the rated levels because few regulators are so precise and are affected by temperature that they turn and off exactly at the rated pressures. If a pressure regulator is damaged or broken it is possible for the tank to either reach unsafe high levels or not turn on when the pressure drops to where it should restart the motor. If you are in doubt, have the regulator checked or replaced as overpressured tanks are very dangerous.

Jun 24, 2012 | Craftsman 150 PSI Air Compressor

1 Answer

Never shuts off, I have to unplug it


You will need to replace the switch, as it contains a pressure switch as well. This is what actually shuts the unit off when it has built to the regulated pressure desired. You will be able to find a new pressure switch from any Ace Hardware.

Mar 01, 2012 | Air Tools & Compressors

2 Answers

Compressor runs and compress air,but when air setting is depleted compressor will not start to compress more air.If you waite it will start some times do think this might the compressor switch


If it doesn't try to start, then it could be the pressure switch. Another suspect could be the thermal overload on the motor. The motor (or just the overload) might be overheating and shutting the unit off, then allowing it to restart when it cools.

Is there any humming, or does it blow the breaker? When ot shuts off, do you hear a brief hiss of air?

If there is humming or breaker blowing on restart, or no hiss of air at shutoff, the pressure switch unloader valve is probably bad. If the air blows off, and there is no humming, and the compressor doesn't reliably start, it is probably the pressure switch. If pressure drops too low, give the pressure switch a tap with a screwdriver. If it starts then, the pressure switch is your problem.

Jun 02, 2011 | Air Tools & Compressors

1 Answer

My regulator broke and I just replaced it. Now the compressor doesn't act like it will automatically shut off when it reaches pressure (130 psi max). Last night it pressured up to right at 130 psi and...


Hi, my name is John. Welcome to FixYa. Look on the pressure switch and see what the max. is. I have some notes here I will have to locate them and I will post them here if you still having problems, but it sounds like you need to replace the pressure switch. Thanks for choosing FixYa...John

Nov 20, 2010 | Craftsman 33 gal Air Compressor 6 hp...

2 Answers

Compressor 25 psi thats it


I assume it keeps pumping, but doesn't build any more pressure. That is probably bad valves or rings. If your unit has a crankcase breather, and it is puffing alot of air, look for rings. Otherwise valves.

Dec 15, 2009 | Campbell Hausfeld 26 - Gallon Air...

1 Answer

Air compressor does not regulate pressure to set point.


Emglo airmate compressors are set from the factory to shut off at around 125psi. There is an adjustment (remove cover to pressure switch) that will controll the cut-off pressure but it is not recommended changing the factory setting. There is also a safety valve installed that will open at about 160psi. It is a small brass device with a pull ring. When things go wrong with the pressure switch (rectangular box with power cord coming out of one side) the safety will pop open. There is a pressure regulator with round knob on panel that will lower the pressure to the tool, however this regulator does not control the pressure switch. Let you compressor run untill it shuts off and verify pressure to be about 125, if it is then all as well. Good Luck

Jan 03, 2009 | Dewalt d55151 factory reconditioned emglo...

1 Answer

Compressor will not turn off


Most single stage compressors come with a pressure switch set to shut off at 125 - 145 psi. These switches become less efficient over time and will Begin to fail but remain useful. A safety valve (brass plut with pull ring) is installed somewhere on your compressor set to open at aprox. 160psi. If the pressure switch shuts off before the safety valve activates you could probably continue to use the unit. If however you would like to have the unit shut off at 125psi replace the switch any switch that can be installed in the space allowed. The black tubing that you see is the unloader. When the unit reaches set pressure and shuts off, the small valve under the pressure switch will open and release the pressure in the tubing. This allowes the compressor to start with no back-pressure. For max. life of compressor make sure that there are no leaks in system and upplug when not in use.
Pressure switches are sold in pressure ranges from 45psi to 160psi. Some brands are better constructed than others. A squareD switch will give long life being used w/o extension cord. Good Luck

Jan 01, 2009 | Campbell Hausfeld 26 - Gallon Air...

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