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cat 416b backhoe boom issues

Discussion in 'Heavy Equipment & Pavement' started by mike33087, Mar 6, 2011.

  1. mike33087

    mike33087 LawnSite Member
    Posts: 108

    I have a 95 cat 416b backhoe, recently i replaced all of they hydro lines on the boom because they were worn and close to blowing. after changing them i topped off the fluid and started the machine. some functions work some don't some i have to use both levers for one action. im pretty certain i put the lines in the right spots, do i have to bleed the cylinders or could one be air locked? any help / diagrams would be appreciated. thanks
     
  2. bobcat_ron

    bobcat_ron LawnSite Fanatic
    Posts: 10,082

    Crack the fittings loose and try again, you got major air trapped in the lines.
     
  3. mike33087

    mike33087 LawnSite Member
    Posts: 108

    so do i just crack the fittings let some fluid run out then tighten them up and run it again? and suggestions if this does not work?
     
  4. bobcat_ron

    bobcat_ron LawnSite Fanatic
    Posts: 10,082

    Crack a fitting and just let the machine idle and move a control for the hose a bit.
     
  5. A.EXCAVATING

    A.EXCAVATING LawnSite Member
    Posts: 23

    check all your hoses again and then crack the lines if its straight fluid coming out you should be find but least bit of air and it will mess you all up
     
  6. wanabe

    wanabe LawnSite Senior Member
    from So. IL
    Posts: 943

    Deere dealer told me once that after replacing a line or cylinder to just pull the controll lever and hold it in place for a few sec, then cycle the controll the other way and hold for a few seconds again to get the air out, and that seemed to work.
     
  7. bearmtnmartin

    bearmtnmartin LawnSite Senior Member
    Posts: 342

    Posted via Mobile Device
     
  8. bearmtnmartin

    bearmtnmartin LawnSite Senior Member
    Posts: 342

    Having had a pos 416 b and replaced way too many lines, I would suggest that you have a couple crossed.....I don't remember ever having to bleed anything. They just shudder for a bit and then go.
    Posted via Mobile Device
     
  9. mike33087

    mike33087 LawnSite Member
    Posts: 108

    does anyone know where i can get a diagram for the lines?
     
  10. A.EXCAVATING

    A.EXCAVATING LawnSite Member
    Posts: 23

    Just go to your local cat dealer and ask them for a diagram and they should print something out for you
     

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