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Hitachi EX330LC-5 hydraulic problems

Discussion in 'Excavators' started by Sloaner250, Sep 15, 2020.

  1. Sloaner250

    Sloaner250 Member

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    i am working on a hitachi 330 ex330lc-5 currently the machine has all but lost right side joystick and track functions, hooked up gauges to pumps and left pump reads 4,000 psi when moving functions, right side pump reads 1,500 psi when moving functions then tested the pilot signal lines to top of both pumps and left line reads 275 psi and right side reads 450 psi. i then swapped the pilot lines around on the pumps because i thought maybe the diffrence in pressure was causing one pump not to stroke up but switching them didnt change anything. anybody have any ideas?
     
  2. uffex

    uffex Senior Member

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    Good day
    I suggest you check out if the right side joy stick has pilot pressure, check if those lost functions come back when you dead end the arm.
    Kind regards
    Uffex
     
  3. Sloaner250

    Sloaner250 Member

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    I have tried dead heading the stick cylinder and it didn’t change anything, I have pilot pressure on the right side joystick because the functions still work they just hardly move with no power to do anything
     
  4. uffex

    uffex Senior Member

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    Good day
    The result suggests there may be an issue with P1 pump regulator - has anything been disturbed recently or any history that may give some cause?
    Kind regards
    Uffex
     
  5. Sloaner250

    Sloaner250 Member

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    Unfortunately no nothing has been disturbed or messed with recently. I’m gonna pull the regulator off and tear it down anything Specific I should look for?
     
  6. uffex

    uffex Senior Member

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    Good day
    I would e looking for a sticking spool may be switch it with the other pump.
    KR
    Uffex
     
  7. Sloaner250

    Sloaner250 Member

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    Okay I will pull apart then switch with other pump tomorrow. Thank you
     
  8. Sloaner250

    Sloaner250 Member

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    okay today i pulled regulators off of top of each pump and switched them and it changed nothing. anybody have any ideas? im kinda thinking its the pump.
     
  9. mg2361

    mg2361 Senior Member

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    Try swapping your pump control valves.

    330 Pump Control Valve.png PCV 1.png PCV 2.png