1. Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

Kobelco sk120-3 LC weak track and boom up

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

  1. majakarot

    majakarot Member

    Dec 1, 2012
    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?