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Kobelco sk120-3 LC weak track and boom up

Discussion in 'Excavators' started by majakarot, Jun 13, 2018.

  1. majakarot

    majakarot Member

    Joined:
    Dec 1, 2012
    Messages:
    6
    Location:
    MI
    Hello, I have a Mark 3 kobelco 120lc that has recently had the pumps rebuilt and runs great but has no power tracking (high low speed works) and a very slow boom up.I recently replaced one of the final drives (broke) and it didn't change the track power. I replaced the hydraulic filters and fluid. Also the pump whine is louder than it should be I think, the boom also drifts down when left In the air even running.
    Thoughts on where to start?
    Thanks