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  1. P

    Komatsu PC78 Excavator swing brake delay

    Pressure drops fast, Oil going not from pipes, Oil going out from swing motor from two holes.
  2. P

    Komatsu PC78 Excavator swing brake delay

    Excavator swinging correct, brake is after 7seconds when I dont touch joysticks. When I unscrew two pressure pipes( from main valve to left and right motor swing) Oil Goes out from motor swing all time. Maybe the swing motor has internal leaks and therefore does not brake properly?
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    Komatsu PC78 Excavator swing brake delay

    Yes I checked. Pressure is correct. 290bar and when I turn the screw of valve the pressure is changing.
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    Komatsu PC78 Excavator swing brake delay

  5. P

    Komatsu PC78 Excavator swing brake delay

    Hi John, I have a problem with swing in komatsu PC210-8k. On swing motor I havent got two relief valves just only one. I have the same problem as friends above. Where can I find a solution? In main valve?
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