Question about Hitachi EC119SA Twin-Stack Air Compressor with Control Panel and Couplers

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The safety switch on my Hitachi EC119SA compressor keeps tripping...what do I need to do to fix it?

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5 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

digritz
  • 530 Answers

SOURCE: Hitachi twin stack problem.

You stated that the compressor started up fine. I'll assume it reached it's max psi then cut out. Then upon reaching it's cut-in psi the motor ran slowly for a few seconds, then kicked off. I also assume you mean check valve when you refer to the non return valve.
If this sounds about right then. The first thing I would do is bleed out all the air from both the tank and the pump supply line leading from the pump head to the tank's check valve. You can do this by simply loosening the fitting that attaches the line at the head or the check valve. Once done try running the compressor again.
The purpose of this is to check the unloader valve. This valve bleeds off the pressure that remains in the compression cylinder and the supply line up to the check valve. When functioning normaly it will bleed off this pressure once the motor shuts off. If it is not working correctly then when your compressor starts back up (once it is already been filled) the piston will be working against a psi close to the max psi.

If the problem reoccurs only after the compressor has reached it's max psi, then the unloader valve is most likely the problem. If however it will not start up at all even after a complete bleed then it has to be something internal to the pump and\or motor.

Please try this and let me know (or repost) your findings.
If it's the unloader valve I should be able to explain how to repair this valve.
Good luck.

Posted on Aug 12, 2009

Testimonial: "Good info"

ollie reece
  • 1167 Answers

SOURCE: when my compressor reaches 120 psi the safety

what is the working pressure bud

Posted on Sep 27, 2009

  • 41 Answers

SOURCE: 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)

Posted on Sep 29, 2009

ollie reece
  • 1167 Answers

SOURCE: the safety switch on my compressor keeps tripping

try by passing the overload switch as these switches can become weak and get back to me with results

Posted on Nov 02, 2009

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1 Answer

Compressor stops before building pressure


I would bypass the thermal safety and test the unit. Does it go to proper pressure? run it through two cycles. If it looks good, reconnect the temp sensor and use it until a new one can be obtained.

Sep 02, 2014 | Hitachi EC119SA Twin-Stack Air Compressor...

1 Answer

Hitachi Ec 119 compressor will not build pressure beyond 25 pounds; no air is heard leaking after I power down the machine. Is it likely the check valve or pressure switch?


If your compressor keeps running and only builds to 25psi, I would suspect the reed valves, head gaskets or a leak. With the compressor running spray soapy water on all fittings, around the head area and tank components. If no leak is found, remove the air filter and feel for suction at the intake(make sure head is not too hot). If you feel good suction at first then suction is lost after reaching 25 psi, most likely reeds or gaskets (with bad reed valves, sometimes you will actually feel air blowing out of the intake). Good luck

Oct 15, 2011 | Hitachi EC119SA Twin-Stack Air Compressor...

1 Answer

EC119SA less than one yr old just has started showing signs of low air volume. Was using it to clean off work bench, first blast of air was strong then quickly has very little pressure. The pressure gauge...


hi there, if there is enough air pressure present in the compressor the motor will stop,the pressure switch is working.if there is a good pressure at start then suddenly lost the pressure,there is no maintaining pressure to use but on the pressure gauge appear to be have a good or enough air pressure. check if the pressure gauge have enough air pressure the motor is stop,meaning the cut out limit switch stop the motor,if you loosen the air pressure from the valve until the cut in pressure attain or meet the motor will run again there will be a cycle process of differential pressure of cut in and cut out set up on pressure switch. checking the compressor,be sure there is a high pressure on compressor and the compressor motor is stop,shut off service valve and disconnect unit device / tools from the service valve. if the compressor have enough air pressure crakc down the service valve and observe the pressure until it run again the compressor motor,if the pressure maintain the pressure you need to clean the bench, the problem is the unit device/tool you use is defective, but if the maintaining air pressure in the compressor is lost due to malfuction of motor and the compressor engine. check the pressure switch, check the motor function by loosening the belt and run the motor w/o the compressor engine if it is tripping brought it to service center, check also the lubricant oil,if neccessary change oil.have a nice day and fix my rate thanks a lot.

Apr 20, 2010 | Hitachi EC119SA Twin-Stack Air Compressor...

1 Answer

Need a new pressure regulator for my ec119sa. Where can we get one. Thanks


Here is a link for an online supplier who sells parts for those

http://www.mastertoolrepair.com/ec119sa-p-7715.html

The regulator is marked as a "pressure reducer" (0030) and is $44.80 on that site. Good luck.

Dec 08, 2009 | Hitachi EC119SA Twin-Stack Air Compressor...

1 Answer

Hitachi hdc-57ies coming up card protected sandisk sdhc 4gb inserted???? help


SD and SDHC cards have a slide switch along one edge. The position farthest from the contacts locks the card, protecting it from writes. The position nearest the contacts unlocks the card. If the switch is already in the proper position, slide it fully the other way and then back again.

Aug 14, 2009 | Hitachi EC119SA Twin-Stack Air Compressor...

1 Answer

Hitachi twin stack problem.


You stated that the compressor started up fine. I'll assume it reached it's max psi then cut out. Then upon reaching it's cut-in psi the motor ran slowly for a few seconds, then kicked off. I also assume you mean check valve when you refer to the non return valve.
If this sounds about right then. The first thing I would do is bleed out all the air from both the tank and the pump supply line leading from the pump head to the tank's check valve. You can do this by simply loosening the fitting that attaches the line at the head or the check valve. Once done try running the compressor again.
The purpose of this is to check the unloader valve. This valve bleeds off the pressure that remains in the compression cylinder and the supply line up to the check valve. When functioning normaly it will bleed off this pressure once the motor shuts off. If it is not working correctly then when your compressor starts back up (once it is already been filled) the piston will be working against a psi close to the max psi.

If the problem reoccurs only after the compressor has reached it's max psi, then the unloader valve is most likely the problem. If however it will not start up at all even after a complete bleed then it has to be something internal to the pump and\or motor.

Please try this and let me know (or repost) your findings.
If it's the unloader valve I should be able to explain how to repair this valve.
Good luck.

Aug 11, 2009 | Hitachi EC119SA Twin-Stack Air Compressor...

1 Answer

Keeps turnning off breaker


You may want to look at the circuit you are plugging this into. This may be pulling a load that is to much with everything else on the circuit and causing it to trip. Try to plug it into a bathroom circuit which should be rated at 20 amps and be of 12-2 wire and see if it trips that breaker or GFI. Let me know and I can help you from there.

Jul 31, 2009 | Hitachi EC119SA Twin-Stack Air Compressor...

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