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Hitachi ex120-2 travel speed issue

Discussion in 'Excavators' started by maineplower, Feb 21, 2021.

  1. maineplower

    maineplower Member

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    When I change the track speed the green rabbit/turtle light changes but the track speed doesn’t seem to change. Any ideas what to look at? Thanks
     
  2. mg2361

    mg2361 Senior Member

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    Check your fuses first. If all is good there then you might have an issue either with the two speed solenoid or a bad pressure switch/wiring on the main pump. If you have or know someone with Dr ZX or MPDr, that would make troubleshooting a whole lot easier.
     
    anuradha and LACHAU like this.
  3. maineplower

    maineplower Member

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    I don’t have the diagnostic tools. I will check the fuse. Where is the solenoid located? Thanks
     
  4. mg2361

    mg2361 Senior Member

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    Do all the other functions work OK?

    If the pressure switch on the pump sends a signal higher than is actually there might keep your travel functions in turtle mode.

    There are 8 solenoids mounted in a valve on cab side next to the main control valve. The travel speed solenoid should be the front solenoid on the bottom row. It should be approximately 23 ohms if you measure the resistance.
     
    anuradha likes this.
  5. maineplower

    maineplower Member

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    Yes all the other functions are fine. It seems to be stuck in fast speed
     
  6. mg2361

    mg2361 Senior Member

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    If you are stuck in high speed then I would concentrate on the solenoid and it's wiring. A defective solenoid, no voltage to the solenoid or a stuck solenoid valve could keep you in high speed. Do you have hydraulic gauges?
     
  7. maineplower

    maineplower Member

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    No I don’t have gauges. When I get a chance I will look at the solenoid. Thanks