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Excavator hitachi ex120-5 bucket and boom not function

ray4one ยท 2014-03-20 19:08

Hi, I have hitachi ex120-5 excavator, since a week ago we try to solve the problem with no success, after the engine is start the bucket and the boom will work only around a minutes then it will began to slow before completely didnt function. Swing and track work fine. We already service the control valve (bucket flow control valve and boom anti-drif valve), but the problem still. Thank you for the future help from this forum. Sorry, for my broken English.

Replies4
  1. #1mikebramel2014-03-20 19:27

    check the displacement solenoid on the pump or swap them

  2. #2ray4one2014-03-20 22:18

    Hi, we already check it.

  3. #3mikebramel2014-03-21 19:26

    The pilot pressure out of the right joystick is good?

  4. #4ray4one2014-03-27 00:32

    Hi mike, thank you for your help. when we open the pilot filter, we found a sand... Someone sabotage the hidroulic tank I think, and sure it have some many time and work to do