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  1. #1
    Bronze Member
    Join Date
    Dec 2007
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    95
    Location
    Cuttingsville, VT
    Tractor
    Ford 850, Ford 1210, Ford 1700, Bobcat 742

    Default Half tracks into home-made dozer

    I have the trans and final drive assembly of a Ford 1700. It is in good shape, so hate to scrap it. I have located a set of half tracks which appear to be the size used on 8N, 600,800, 801 series Ford tractors. My fertile imagination envisions adding frame rails from the rear fender mounts forward to accommodate a front axle and engine mounts. Picture a Toyota 22R engine (smaller if possible) and 20" truck tires to carry the half tracks. Steering would be by using the original tractor brakes. This home-made dozer would carry a PTO powered winch or pull a forestry trailer for firewood cutting. Any thoughts about feasibility, fatal design flaws, etc??

  2. #2
    Super Member Iplayfarmer's Avatar
    Join Date
    Jul 2005
    Posts
    5,224
    Location
    Idaho
    Tractor
    Massey Ferguson 1215, Toro 266-H, Pennsylvania Panzer, Case 444, Craftsman 14/6

    Default Re: Half tracks into home-made dozer

    Quote Originally Posted by tree grower View Post
    I have the trans and final drive assembly of a Ford 1700. It is in good shape, so hate to scrap it. I have located a set of half tracks which appear to be the size used on 8N, 600,800, 801 series Ford tractors. My fertile imagination envisions adding frame rails from the rear fender mounts forward to accommodate a front axle and engine mounts. Picture a Toyota 22R engine (smaller if possible) and 20" truck tires to carry the half tracks. Steering would be by using the original tractor brakes. This home-made dozer would carry a PTO powered winch or pull a forestry trailer for firewood cutting. Any thoughts about feasibility, fatal design flaws, etc??
    Sounds like something I have planned, except my plan is on a much smaller scale.

    There are challenges with this design, not the least of which is the longevity of the brakes if used for steering. But, that shouldn't stop you. I assume you don't plan on using the homemade dozer all day every day.

    Tracked vehicles fascinate me. I hope to see you make some mistakes on this build so that I can learn from them.
    From now on I will only buy cars that are a silver/grey color. Then I can make all body repairs with Duct Tape.

  3. #3
    Veteran Member
    Join Date
    Jul 2005
    Posts
    1,924
    Location
    NH seacoast & Coos County
    Tractor
    Kioti DK45S

    Default Re: Half tracks into home-made dozer

    Treegrower, If you use truck tires as idlers at the front you might consider something with disk brakes. Use them for steering, cheaper & easier to maintain than drum brakes. Something from a one ton truck should be oversized enough for long service life in your application. You would have to keep the tracks quite tight for this to work unless you also used the tractor brakes to stop the drivetrain. MikeD74T

  4. #4
    Veteran Member
    Join Date
    Jan 2010
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    2,380
    Location
    Northern, IL
    Tractor
    Branson 2400H

    Default Re: Half tracks into home-made dozer

    Would the rear end ring and bull gears stand up the constant locking of the brakes to steer? Stop one wheel the other goes twice as fast.

    Is there any way to make this more like the half track military vehicles where they still retain the front wheels and some steering can be done that way?

    Just some thoughts from some one who has had to replace ring and bull gears on a tractor with no diff lock and lots of mud..

    Roy

  5. #5
    Bronze Member
    Join Date
    Dec 2007
    Posts
    95
    Location
    Cuttingsville, VT
    Tractor
    Ford 850, Ford 1210, Ford 1700, Bobcat 742

    Default Re: Half tracks into home-made dozer

    These are the things I need to be warned about. The military half track configuration is essentially the same as the old tractor set-up with front wheel steering. Would the rear gears survive better if the steering was by front discs as suggested by Mike? You realize, of course , that what I really want is a 1/3 scale Rottne forwarder at 1/20 the price. Let me know if you see one for sale.

  6. #6
    Elite Member
    Join Date
    Oct 2003
    Posts
    3,167
    Location
    the Steernbos (Holland)
    Tractor
    Zetor 3011, Zetor 5718

    Default Re: Half tracks into home-made dozer

    Quote Originally Posted by oldnslo View Post
    Just some thoughts from some one who has had to replace ring and bull gears on a tractor with no diff lock and lots of mud..
    If there is no difflock and one wheel keeps spinning, its the spider gears that get a lot of abuse, the ring and pinion are loaded more when there was a difflock.
    What kind of tractor are we talking about ?
    Free scrap is a good investment !!!
    “The worst enemy of life, freedom and the common decencies is total anarchy; their second worst enemy is total efficiency” · Aldous Huxley
    __________________
    1967 Zetor 3011, restoration in progress: Technically new, just needs the cosmetics..
    1973 Zetor 5718, home made loader
    1998 Volvo S70 TDI
    2007 Volvo 440 1.9 TD based dirt buggy, needs time !

  7. #7
    Bronze Member
    Join Date
    Dec 2007
    Posts
    95
    Location
    Cuttingsville, VT
    Tractor
    Ford 850, Ford 1210, Ford 1700, Bobcat 742

    Default Re: Half tracks into home-made dozer

    This is a Ford 1700, 1978 vintage (+/-), 23 HP. Was originally a 4WD, but I needed the front end for my daily driver, and it came with no engine. It does have a diff lock. With the risks of damaging the rearend, I might be as well off to put a regular non-power I-beam front axle under it, and use the half tracks as originally intended

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