Hitachi EX75UR

Hi everyone, I believe I have successfully bypassed the spool solenoid system. I connected all the lines except one which I had to cap. All of the hydraulic systems function properly, but I believe there is now some sort of wiring fault. When I turn on the machine, it revs to maximum revs regardless of throttle position. It functions well for about 7 seconds (all hydraulics work as usual), then the machine dies. The machine has to crank for about 10-15 seconds before firing up again, so I assume the fuel solenoid is shutting the motor off? Does anyone have any idea what might be going on? Thanks!

Hi, how did anyone get on with this ? I am having the same issues, my arm won't come back in, after extending out it won't return and the alarm sounds beeping noise. I was able to use the main toggle switch behind the seat to deactivate once. The machine worked normally for around an hour or so and once I stopped digging it activated again, now the toggle switch won't do anything to stop it. I had tried the other switch underneath the right side 1st time and also this time and it doesn't seem to have any effect at all on deactivating anything. All other controls are working as normal on both joysticks , only issue is pulling the arm back in, no problem extending out so the ram is not the problem. I would appreciate any help you could give. Thanks in advance.

Did anyone find an easy way to sort this problem. Our machine has worked fine for years but played up a few weeks ago, it worked when I tried it a few weeks ago but went to use it today and it's stopped working again. Can anyone help please

Hi, Attempting to revive an old thread. Did you ever get the machine to operate properly with the bypassed spool solenoids bypassed?

brokenhitatchi said: Hi everyone, I believe I have successfully bypassed the spool solenoid system. I connected all the lines except one which I had to cap. All of the hydraulic systems function properly, but I believe there is now some sort of wiring fault. When I turn on the machine, it revs to maximum revs regardless of throttle position. It functions well for about 7 seconds (all hydraulics work as usual), then the machine dies. The machine has to crank for about 10-15 seconds before firing up again, so I assume the fuel solenoid is shutting the motor off? Does anyone have any idea what might be going on? Thanks! Click to expand... Hi, just wondering did you ever get this problem sorted, have the same problem with my offset boom and wanted to bypass the full 7 block solenoid if possible. Thanks!

Right, I saw that. But it sounds as though it’s running worse than before bypassing the solenoids, are we assuming the bypass isn’t the cause of the current issues?

Dackdack said: Hey guys, I’m finally working on the issue. I cannot find or I am not sure where the 7 spool solonoid valve is. I have taken some panels off of where I thought it would be but this is all I see. Can anyone tell me if these two things are what I am supposed to be bypassing. Thanks Click to expand... Hi Dackdack. I found this thread after having IDENTICAL issues with my EX75 UR. How did you get on and did you resolve? Please let me know if possible…. Regards

JasonMcC said: Hi, just wondering did you ever get this problem sorted, have the same problem with my offset boom and wanted to bypass the full 7 block solenoid if possible. Thanks! Click to expand... How did you get on and?. I’m having the same issue. Can’t see if anyone resolved it via the bypass?