Hitachi EC12 Portable Electric 2hp Air Compressor, Oil Lubricated Logo
chuck hart Posted on Dec 13, 2011
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Air compressor will not restart after it builds pressure and pressure drops to 80 psi

When there is no air pressure it will start the compressor and build pressure up to 130 psi. after the compressor is used and the pressure drips to 80 psi the compressor tries to restart and is unable to do so

1 Answer

Anonymous

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  • Master 1,212 Answers
  • Posted on Jan 19, 2012
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Joined: Dec 10, 2011
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Make sure the power cord is plugged into an adequate extension cord if one must be used. Never less than 12 gauge wire.

The start/run capacitor may need to be replaced.. If there are any ball check type valves, make sure they are not worn or sticking. they would be on the output of the compressor head itself.

4 Related Answers

Anonymous

  • 1 Answer
  • Posted on Feb 28, 2009

SOURCE: compressor will not build pressure

compressor will not build pressure

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mrhappyface

Joe Garcia

  • 210 Answers
  • Posted on Nov 27, 2009

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

A

Anonymous

  • Posted on Nov 09, 2010

SOURCE: compressor will not restart after

Only got the pressure switch
Pull the cover and check it out,not much different than a well pump sw

Repair Ahjoshe

  • 885 Answers
  • Posted on Mar 07, 2011

SOURCE: My four-year old PC pancake compressor starts fine

First take off the head on the air pump and check the reed valves on the valve plate. If they got hot and warped or cracked they'll work to a point then no more pressure can be built up. Next check the pistion ring and cylinder wall. If either is damaged you'll only get so much pressure build-up then it will leak past the piston.

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Makita MAC5200.Brand new.Just broke-in. Pressure goes to 140 PSI and stops.Tries restart at 110 PSI.Motor"Humms"only.Will not restart until pressure below 20PSI.

http://www.toolpartsdirect.com/makita-mac5200-3-0-hp-air-compressor.html
There is a part called an unloader. It reduces the pressure on the compressor when the unit stops at the desired pressure. The actual unloader may be part of number 50 in this diagram.
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Troubleshoot overflow condition

Sounds like worn pressure control valve. I'd replace it.
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Air compressor slow to build pressure, and noisy.

All large air compressors are very noisy.

How long it takes to come up to pressure depends on the size of the compressor piston(s), how fast they are running and the size of the air tank attached to it. (and if the tank or hoses have leaks)
A 20 gallon tank could easily take 10 minutes to get all the way up to 120 psi. 120 is very high, and probably the limit for the compressor. Depending on what you're using it for, try dropping the setting to say 80-90psi.
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Compressor runs until overload release valve opens (pressure at 130 psi) and then air escapes until pressure lowers to 100 psi..Then motor begins to restart, but will not , due to 100 psi and kicks breaker...

There is a check valve between the compressor and tank, and there is also an 'unloader valve' which blows the pressure off the compressor so that it starts under little load. I think your check valve is stuck open and the unloader valve is blowing tank pressure off.. and when the compressor tries to start it's starting against the pressure in the tank.

So check/replace/thaw the check valve and you'll be good to go. It's generally at the tank where the line from the compressor head goes into the tank, it'll be between the two somewhere.

lp
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I have an Ingersoll Rand T30 10 HP compressor that runs OK and will bulid up 150 psi without any problems. But when the pressure drops enough to kick the pressure switch, the motor won't start. just tries...

When the compressor comes up to pressure and kicks off, you should normally hear a gasp of air escaping. That gasp is the release of pressure from the compressor itself - not the tank, and it is supposed to get released so that the compressor can restart without being preloaded with compressed air. My guess is that the gasp is not happening. It is probably some debris or a gummy mechanism. The mechanism is supposed to be triggered by the same mechanism that shuts off the motor.
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Hitachi EC 12 Air Compressor does not keep pressure

to repair this problem (a) the pressure switch is not working,(b) check valve or non return valve sticking(stripe down repair and refit)
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Air compressor switch

That means that when the switch is turned on , and the complessor is pluged into a power outlet, the electric motor will start when the air pressure in the tank drops below 80 psi.and the motor will stop when the pressure reaches 100 psi.

please rate this,
Rob...
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