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JLG 8042 Steering lockup

Discussion in 'Forklifts/Telehandlers' started by AndrewTul, Oct 12, 2019.

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  1. AndrewTul

    AndrewTul Member

    Joined:
    Oct 12, 2019
    Messages:
    7
    Location:
    Oklahoma
    Hello. I’ve got a skytrak 8042 in the shop. It’s got two steering modes locking up. Front and Four wheel steering locks up clockwise/counter clockwise. All other functions working correctly. Main pump 3000psi secondary manifold replaced/steer select replaced by another company.

    Does this sound like an electrical issue at a solenoid? Crossed hydraulic lines? Possible check valve? Thanks guys.
     
  2. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    169
    Location:
    florida
    If you have had the selector valve replaced it sounds like you may have crossed lines. Take the lines loose on both ends and see if the problem goes away. Does it have double ended cylinders or 4 individual cylinders? In either case taking lines loose will help diagnose the issue. Make sure the lines are plumbed up properly on the selector valve first.make sure no lines have been crossed on the orbital steering valve also.
     
  3. AndrewTul

    AndrewTul Member

    Joined:
    Oct 12, 2019
    Messages:
    7
    Location:
    Oklahoma
    Thanks Tractormech. As soon as I have access to the machine. Plumbing circuit is where I’ll start. New "Parker” selector valve.
     
  4. AndrewTul

    AndrewTul Member

    Joined:
    Oct 12, 2019
    Messages:
    7
    Location:
    Oklahoma
    Problem resolved: new selector valve pulled off (truck with issue) installed into (good truck) problem followed. Thanks so much.
     
  5. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    169
    Location:
    florida
    glad you found the issue