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  1. K

    980H lift cylinder drift

    Ok, machine has been fixed. It ended up being a very simple repair. I will start from the begining. In August of 2013 the lift cylinders began drifting. A few weeks later the left hoist cylinder began leaking from under the head (where it bolts to the barrel). We decided to run machine until we...
  2. K

    980H lift cylinder drift

    Thanks for your replay Per. We have ~20mm/min. We have two 980H's that were bought new. The other one @ about 12,000 hours developed the same issue. It was corrected by replacing the load lift check valve. I have an idea for testing the seat of that load check valve I'm going to try later this...
  3. K

    980H lift cylinder drift

    Bob, thanks for your reply. The cushion ride works in both manual and automatic. The cylinders drift all the time. Doesn't matter if the ride control is on or off. Also drifts with the engine running and with the engine off. At this point we are considering inspecting the seat for the lift check...
  4. K

    980H lift cylinder drift

    980H with ride control. Lift cylinders drift. Resealed both lift cylinders. Replaced load lift check valve. Replaced ride control shuttle valve. Replaced O-rings on ride control balance valve. Removed both ride control solenoid valves and energized on bench, OK. Inspected control valve spool...
  5. K

    test

    3rd and final test :D
  6. K

    test

    test 2
  7. K

    test

    test 1
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