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  1. #1
    Member Beechboy's Avatar
    Join Date
    Aug 2012
    Posts
    31
    Location
    Greenwood BC Canada
    Tractor
    2010 JD 3520,2008 JD LA 175, 1946 Ford 2N

    Default 2010 John Deere 485 Backhoe Dipperstick actuator issues

    Good evening folks.
    I have an issue with my dipperstick Actuator. The other day I was digging when the dipperstick failed to respond to inputs. I removed the actuator from the tractor and tore it down. What I found was the actuator piston rod nut laying in the bottom of the cylinder along with all the threads from the piston. Any idea what would cause this other than bad heat treating, and has anyone else had this issue or know of any recalls.

    Thanks for any Input
    Regards
    Curtis

  2. #2
    Elite Member dfkrug's Avatar
    Join Date
    Feb 2004
    Posts
    4,662
    Location
    NorCal
    Tractor
    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: 2010 John Deere 485 Backhoe Dipperstick actuator issues

    Wow, I have never seen that.

    My guess is the piston nut got over-torqued at the factory, and/or the nut was
    oversized. Or threads on the rod were undersized. Or a crappy batch of nuts
    or rods.

    It often takes me a good 300-400 ft-lbs of torque to remove piston nuts.

    I have seen 2 cyls with loose nuts, but good threads.

  3. #3
    New Member
    Join Date
    Feb 2013
    Posts
    24
    Location
    n/a
    Tractor
    MF50H, MF165, Fiat 355M, JCB 3C

    Default Re: 2010 John Deere 485 Backhoe Dipperstick actuator issues

    hello,
    another possibility is that nut went loose because of vibration. That's quite common on backhoes or poclain type machinery that yse hydraulic braker for a long time.

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