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Kato HD 900 SEV slow operaion

Discussion in 'Excavators' started by Mark250, Mar 19, 2017.

  1. Mark250

    Mark250 Senior Member

    Joined:
    Aug 30, 2015
    Messages:
    517
    Occupation:
    heavy equipment technician
    Location:
    victoria,Australia
    Hi all I need some help with a Kato HD 900SEV digger S/n 900514sw
    the machine has pilot operated controls for the main attachments and uses cables to operate the travel spools
    the problem is when machine warms up the functions on the left hand joystick go slow. operating the right hand joystick improves the slow functions. i suspect the pump signal system but do not know how it operates as the pilot lines go directly to the main control valve .there also appears to be no pilot pump as such.
    As I am unfamiliar with Kato hydraulic systems I am hoping some one on the forum can help with either experience or manuals and schematics
    Any help most appreciated
     
  2. Tones

    Tones Senior Member

    Joined:
    Mar 15, 2009
    Messages:
    506
    Occupation:
    land clearing contractor
    Location:
    Ubique
    There are 2 pumps piggy backed, each pump supplying 1 control bank.Follow the hoses from the pumps to find out what goes where.As a starting point flow and pressure test the pumps. If they are ok then move onto the control bank and test.The problem could be as simple as a broken 0 ring at worst a worn pump.
    Has this machine run a rockbreaker? If so check the quality of the hydraulic oil.I have experienced grease contaminated oil which came from using rockbreakers resulting in stuffed pumps
     
    Last edited: Mar 20, 2017
  3. rocknrabbit

    rocknrabbit Member

    Joined:
    Feb 12, 2015
    Messages:
    8
    Location:
    vic australia
    I may have a manual to suit you, I will have a look for it when I hear from you. Where in this fair state of ours are you?
     
  4. Mark250

    Mark250 Senior Member

    Joined:
    Aug 30, 2015
    Messages:
    517
    Occupation:
    heavy equipment technician
    Location:
    victoria,Australia
    thanks rocknrabbit I am in ballarat