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I have an Hitachi ex40 excavator. it has started to nearly stall

When i dig a full load the engine nearly stalls, it only just started doing this, can anyone help..

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I have a EX200-3 it starts but has no power. when I use any function it wants to stall. Except for the bucket function, when i use this function the engine frees up. I brought it to a mechinic but they couldnt find the problem and even made the problem worse. So when I start it up the engine sounds like there is a heavy load on it and ready to stall, this problem began and has become worse to the point I can not use the machine. Help please....

Posted on Jul 21, 2009

  • alfons curin
    alfons curin Dec 03, 2013

    I had the same problem and it was the small ( 12 V ) fuel pump


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If fuel system and air system can funtion normally,you can check the electric system at machine control (solenoid,wirng untill engine controller.

Posted on Mar 04, 2010

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I have a Hitachi EX 40 digger and its leaking hydraulic oil from the Final Drive what can I do

Posted on Sep 10, 2010

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Hi mate, it sounds like a fuel system problem, do these checks:

1. Make sure fuel is fuel
2. Check that fuel runs freely from fuel line to injector pump.
3. Replace fuel filter.
4. Clean any inline sediment screens and sediment/water traps.
5 .Bleed fuel system at injector pump.

Other possible causes:

Dirty Air filter

Cylinder Head Valve Tappets need adjusting

Fuel injector pump not timed correctly ( this would not be a progressive problem but would occur if pump had been reinstalled and timed incorrectly.)

Hope this helps.


Posted on Jun 18, 2009

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have you done the 60k miles service yet? if not , why not do that now.
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