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  1. #1
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    Default 4WD variations.?

    .. I don't mean to hog the forum.. Hopefully someone else has the same questions that need answering..

    .. Seems like I've heard or read somewhere that there's different kinds of 4WD available on tractors.. I know I've heard of a "forward assist" or some such.. Then there's that funky little thing on the kubota's that knocks out the 4WD in tight turns..
    .. What all kindof 4WD variations are there and are any of them to be avoided.? Thanks.!! d:^) Schneeky..

  2. #2
    Veteran Member
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    Jul 2002
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    1,171
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    North of the Fingerlakes - NY
    Tractor
    Ford 4000; Ford 2000(both 3cyl.);JD40; 2004 Kubota L4300; 2006 Kubota B7610; new 2007 Kubota MX5000

    Default Re: 4WD variations.?

    This thread should bring some interesting information out of the woodwork.

    In terms of design, I know there's the fully enclosed bevel gear drive system used by kubota and the half-shaft from a central differential design used by everyone (?) else. The bevel gear system works really well...on small tractors at least. I have seen a few posts saying it's not the best choice for really large tractors and not as strong as the half-shaft designs. What they may really be saying is that the bevel gear front axles are more expensive for a given level of strength and, beyond a certain point, become cost prohibitive.

    Don't know of anything on a Kubota that knocks out 4WD on a tight turn. Never seen it work that way on my own tractors; though I try to avoid turning tight while in 4WD.
    Bob
    New Kidz: '04 L4300 w/BH-90X, '06 B7610, '07 MX5000 Old Pros: '75 Ford 4000, '54 JD40

    Romans 8:28

  3. #3
    Gold Member
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    Dec 2006
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    435
    Location
    Oakdale, TN
    Tractor
    Kubota M8540HD ROPS

    Default Re: 4WD variations.?

    kubota likes to point out that their enclosed bevel gear front axle drive systems deliver full power at all steering angles.

  4. #4
    Platinum Member roxynoodle's Avatar
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    May 2006
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    989
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    NW Ohio
    Tractor
    Yanmar 1510d, 1950 Farmall H

    Default Re: 4WD variations.?

    My understanding is that all compact tractors use "front wheel assist" rather than true 4wd. At least I haven't seen a compact with true 4wd. A true 4wd will have the same size front tires as rear tires, like the Steigers do. We use the term "4wd" loosely to mean we can engage the front as well as the back.
    Yanmar 1510D, finish mower, rotary cutter, box blade, rear blade, post hole digger, 1950 Farmall H

  5. #5
    Veteran Member ericher69's Avatar
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    Aug 2008
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    Ontario Canada
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    2008 Kubota b2920

    Default Re: 4WD variations.?

    Quote Originally Posted by roxynoodle View Post
    My understanding is that all compact tractors use "front wheel assist" rather than true 4wd. At least I haven't seen a compact with true 4wd. A true 4wd will have the same size front tires as rear tires, like the Steigers do. We use the term "4wd" loosely to mean we can engage the front as well as the back.
    Not so! Tires can be different sizes and still be a "true" 4wd as long as it is geared properly.

  6. #6
    Silver Member slewisma's Avatar
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    Jun 2008
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    155
    Location
    Littleton, MA
    Tractor
    Kubota BX24

    Default Re: 4WD variations.?

    Quote Originally Posted by ericher69 View Post
    Not so! Tires can be different sizes and still be a "true" 4wd as long as it is geared properly.
    The contact patch on those little front tires is a lot smaller than on the rears. So, if geared right, you can have full 4WD on anything but how much additional traction you'll experience is a separate question.

    I can't speak for CUTs since I have a BX-24. I can say that on SCUTs, those front tires can sink the front to the frame in less time than it takes to realize you are getting stuck.

    4WD is a very valuable feature for having four wheel braking through HST and it will probably be of some help in the winter on the driveway. In deep mud, not so helpful.
    -Scott

    BX24 FEL, BH, 54" Finecut MMM, Woods Landscape Rake, BXpanded sprayer, forks and BH dolly .... so far.

  7. #7
    Super Star Member IslandTractor's Avatar
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    Sep 2005
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    16,958
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    Prudence Island, RI
    Tractor
    2007 Kioti DK40se HST, Woods BH

    Default Re: 4WD variations.?

    Quote Originally Posted by piller View Post
    kubota likes to point out that their enclosed bevel gear front axle drive systems deliver full power at all steering angles.
    What is the big deal about full power at all steering angles with a tractor? Full power and traction is typically needed when pulling a plow which is generally in a straight line or when loading the FEL bucket which is also a straightahead direction. When do you need full power/traction while turning hard with a tractor?

    Seems to me this is just a marketing gimick.

  8. #8
    Silver Member
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    Aug 2008
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    110

    Default Re: 4WD variations.?

    ..Hey IT, what do ya call that contraption on yer FEL there.? Looks like somethin I'd be interested in..
    Will it go in place of a regular bucket or are there some additional hydraulics needed.? Thanks..

    ..Look Gizmo.. It's starting already.. Dang.!! d:^) Schneeky..

  9. #9
    Super Star Member IslandTractor's Avatar
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    Sep 2005
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    16,958
    Location
    Prudence Island, RI
    Tractor
    2007 Kioti DK40se HST, Woods BH

    Default Re: 4WD variations.?

    Quote Originally Posted by Schneeky View Post
    ..Hey IT, what do ya call that contraption on yer FEL there.? Looks like somethin I'd be interested in..
    Will it go in place of a regular bucket or are there some additional hydraulics needed.? Thanks..

    ..Look Gizmo.. It's starting already.. Dang.!! d:^) Schneeky..
    It is a grapple. do a search and you will find hours of reading on the subject here on TBN.

    Yes, you would need to run hydraulics to the grapple. Several options. Again, do a search on diverter valve or rear remote and grapple. There is lots of info here on TBN on these subjects.

  10. #10
    Silver Member
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    Jul 2006
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    235
    Location
    Pittsburgh, Pa
    Tractor
    Chinese quality - Jinma 2420 - Ford 1900 - Steiner 420

    Default Re: 4WD variations.?

    I have a Steiner 4wd Hydro tractor and it's a true system of 4wd. You can have wheel(s) in the air and they still only turn as fast as the ones on the ground. It's one h*ll of a machine for snow removal with the mini bucket (4ft) on it. I've never seen a tractor that can push a 3 foot pile of snow in front of the bucket UP a hill around a bend and pushing it in the direction you want to go. It's unbelieveable awesome. Also, this past winter I was plowing with it and went to take the trash can up the hill. It turned out there was ice under the snow and I could barely stand on the driveway on the slope. But it was weird that the Steiner could clear that snow without issues where I couldn't even walk. Just goes to show when engineering is applied to a solution what can be done.

    Steve
    Ford 1900 4wd & Steiner 420

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