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  1. #21
    Platinum Member dieselsmoke1's Avatar
    Join Date
    Aug 2003
    Posts
    842
    Location
    Eastern North Carolina
    Tractor
    Mahindra 2810HST

    Default Re: Tractor ballasting, weight distribution & free body diagrams

    Quote Originally Posted by Egon
    Lets add the case where the bucket is placed under a very heavy load and the curl feature lifts the rear wheels off the grond??
    Did that last weekend and it actually worked pretty good. The rears settled right back down when the load on the 3pt was lifted. Don't think the FEL could have gotten it up any other way.
    _________________________________________________

  2. #22
    Elite Member hazmat's Avatar
    Join Date
    Feb 2002
    Posts
    4,028
    Location
    West Newbury, MA & Harrison, ME
    Tractor
    Kubota L5460HSTC

    Default Re: Tractor ballasting, weight distribution & free body diagrams

    I'm glad y'all are enjoying my chicken scratches - schmism did point out an an important ommision the height of the CG above ground - loaded tires add weight low, the FEL adds weight high. Also - dateacha brings up great points about the three axis of rotation.

    Hopefully this gives the non (or lapsed) science types an idea of the theory of how to "keep the greasy side down"
    Hazmat

  3. #23
    Bronze Member
    Join Date
    Jan 2005
    Posts
    97
    Location
    Indiana
    Tractor
    JD2305, 1948 B.F. Avery Model V

    Default Re: Tractor ballasting, weight distribution & free body diagrams

    Fun post, although you also need add an assumption for ~ 200# of "mostly water" ballast in the operator's seat -- not sure about you but my bucket is rarely off the ground if my butt is not in the seat.

    For completeness and extra credit now we need to add a little sensitivity analysis.

    1) Perhaps a loaded tractor with rear ballast (but no filled tires since many don't have) on a 15% slope.

    2) Same as #1, but approximate the 1st order effect of a sudden braking event (deacceleration travel of perhaps 1') with tractor going 3mph down same incline.


    Please solve and post response quickly or my curiousity will now force me to solve these myself...
    JD2305 w/ 62MM, 200CX, Markham toothbar, RB1060, sprayer, Ballast,
    1948 B.F Avery (Model V)

  4. #24
    Super Star Member Egon's Avatar
    Join Date
    Aug 2001
    Posts
    17,996
    Location
    Nova Scotia, Canada

    Default Re: Tractor ballasting, weight distribution & free body diagrams

    Dieselsmoke1:

    Thats called "Tractors in Moition" or Dynamic stability!

    My little tractor spends much of it's time on the two front wheels when doing loader work.
    Egon
    50 years behind the times
    Livin in a
    Worn out skin bag filled with rattlin bones

  5. #25
    Bronze Member wwmw's Avatar
    Join Date
    May 2012
    Posts
    59
    Location
    Limestone, TN
    Tractor
    Ford LGT 145 14HP KOHLER

    Default Re: Tractor ballasting, weight distribution & free body diagrams

    Hazmat, really great post thanks!

    William
    What I have:

    1) Cub Cadet RZT 50 ZeroTurn KOHLER COURAGE 22HP

    2) Cub Cadet 1515 KOHLER COMMAND 15HP OHV

    3) Ford LGT 145 14HP With FEL/Back Blade

  6. #26
    Elite Member
    Join Date
    Jan 2010
    Posts
    2,727
    Location
    Northern, IL
    Tractor
    Branson 2400H

    Default Re: Tractor ballasting, weight distribution & free body diagrams

    Quote Originally Posted by Egon View Post
    Dieselsmoke1:

    Thats called "Tractors in Moition" or Dynamic stability!

    My little tractor spends much of it's time on the two front wheels when doing loader work.
    While Egon,
    from your signature you more meat on them bones to help keep the rear wheels on the ground
    Artificial Intelligence will never overcome natural stupidity.

    Branson 2400H MMM & FEL

    JD 112

    BX1850 gone but not forgotten

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