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  1. M

    Hitachi zx225uslc thumb opens but wont close

    I have a 06 hitachi zaxsi 225 uslc, i bought the machine without a thumb but it had the plumbing for a attachment on it. i installed a thumb last summer and literally just had to connect hoses and it worked, i played around with one of the set screws to adjust pressure so the bucket over powers...
  2. M

    Hitachi zx225uslc throttle not working

    Not so much to say a win.. i did some more diagnosing, everyone is saying to check the 5v reference circuit . i did find one pigtail of a sensor on the pilot valve that was broken, replaced it and i havent had the issue again (fingers crossed). So it hasnt acted up since but now i have a issue...
  3. M

    Hitachi zx225uslc throttle not working

    We replaced the throttle cable thought it solved the issue, was temporary. now back to square one doing the same thing again
  4. M

    Hitachi zx225uslc throttle not working

    None whatsoever, when i turn on the key generally you can her the servo motor do a adjustment of some sort, when i have this issue it makes no sound with key on
  5. M

    Hitachi zx225uslc throttle not working

    Well guys its doing the exact same thing again 1- wont shut off with key 2- dr.zx wont communicate 3- no servo sound or motion with key on 4- must use manual throttle kill to turn off machine 5- servo motor, throttle cable have been replaced.
  6. M

    Hitachi zx225uslc throttle not working

    Well after all of that, replace servo motor, pulling interior dash apart to test wiring, testing all the sensors, took your advice and replaced the throttle cable and wouldnt you know it a new throttle cable from servo to inj. pump fixed all my issues!!! I do thank all of you for the trouble...
  7. M

    Hitachi zx225uslc throttle not working

    OK adjusted the throttle cable while machine was running and took the idle right down to almost a sputter, then ithgtened it up and used key to turn off, barely made the rpm drop when i hit the key off.. engine relearn ? also when i had the servo motor disconnected initially there was about a...
  8. M

    Hitachi zx225uslc throttle not working

    I was finally able to get someone to shut of the machine while i watched the servo motor. When shutting down the engine you can hear rpm drop/ sputter a bit to a lower rpm. Watching the actual motor it barely actuates the throttle when shutting it down. Iam going to adjust the throttle cable...
  9. M

    Hitachi zx225uslc throttle not working

    Ive read that welding on the machine can cause alternator diodes to get fried. That being said we just welded catwalks on the machine and a thumb prior to that, we used the night switch as our battery disconnect. Maybe the 2 events are related..
  10. M

    Hitachi zx225uslc throttle not working

    Interesting.. so this diode in the alternator i assume is not replaceable/serviceable.. has to be replaced with the alternator? So check harness to the alternator then?
  11. M

    Hitachi zx225uslc throttle not working

    Did a relearn did not solve the issue with not being able to turn off with key.Throttle works however
  12. M

    Hitachi zx225uslc throttle not working

    I have swapped all the diodes back and forth with no results, trying each time to turn off with key...still cant turn off with key.
  13. M

    Hitachi zx225uslc throttle not working

    In regards to this valve controller what and where is this??
  14. M

    Hitachi zx225uslc throttle not working

    Did some unplugging today AT this time dr.zx connected and throttle working with dial, BUT cant shut off with key still i had the drzx monitoring all 4 sensors unplugged the 4 sensors that had codes one at a time and watched the values disappear however no time did i regain the ability to shut...
  15. M

    Hitachi zx225uslc throttle not working

    Alright SUCCESS IN CONNECTING THE DR.ZX Codes read 6,13,15,16,18 Faulty ec sensor faulty pump 2 pump control pressure sensor Faulty boom raise pilot p. sensor Faulty roll-in pilot pressure sensor Faulty travel pilot pressure sensor Now going forward are all of these codes related to one harness...
  16. M

    Hitachi zx225uslc throttle not working

    Iam assuming your thinking that the servo motor is just not pushing or pulling the cable all of the way to shut the motor off then?? Would not being able to see any of the settings on the screen/cluster by pressing display be related? As well as the no communication issue with the dr.zx...
  17. M

    Hitachi zx225uslc throttle not working

    Throttle was working today with the dial however still cant shut off with key, cannot read any values on the screen by pressing the set button, and drzw wont communicate. good idea about taking the ecm apart, thats probably all thats left. Think i may just bite the bullet and get a ecm and...
  18. M

    Hitachi zx225uslc throttle not working

    Fired up this morning throttle working fine. Hate this intermittent issue while throttle is actually working for the moment i Still did readings on the ec sensor circuit. read 2.19v between #2and#3 at idle and read 1.91v at full throttle which doesnt make sense to me as slow idle should be...
  19. M

    Hitachi zx225uslc throttle not working

    Yes i have a dr.zx manual i got from the internet.
  20. M

    Hitachi zx225uslc throttle not working

    Yes apologies it is a 6 pin plug for the dr.zx the icx and mcx are both 6 pins
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