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  1. #1
    Platinum Member Mark Page's Avatar
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    Sep 2009
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    559
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    Maryland
    Tractor
    Massey Ferguson 2615 48hp, 4wd, loader

    Default 4x4 ?

    I've probably owned 6 4wd vehicles over the past 20 years. Pick Ups, SUVs etc. Everyone would buck when you tried to turn in 4wd. With the 4wd engaged my new Massey 2615 w/mfwd will not buck no matter how sharp you turn or what speed. Why is this?
    Gear Up and Throttle Down.

    2011 Massey 2615, 7ft Woods Rear Discharge Finish Mower, 6 ft Lucknow Snow Blower, Danuser post hole digger with 12" and 24" augers, 350 lb 3 pt broadcast spreader, 7ft scraper blade, 7 ft. drag harrow, JD GT 275 rider with 38" snow blower attachment.


  2. #2
    Super Star Member murphy1244's Avatar
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    Nov 2011
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    16,504
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    Ohio
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    Kioti DK 40-Massey ferguson 135-Ventrac 4500 Diesel

    Default Re: 4x4 ?

    Quote Originally Posted by Mark Page View Post
    I've probably owned 6 4wd vehicles over the past 20 years. Pick Ups, SUVs etc. Everyone would buck when you tried to turn in 4wd. With the 4wd engaged my new Massey 2615 w/mfwd will not buck no matter how sharp you turn or what speed. Why is this?
    You sure your really in 4 wheel?
    Murph ------------

  3. #3
    Epic Contributor Soundguy's Avatar
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    Mar 2002
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    47,620
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    Central florida
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    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: 4x4 ?

    does it use cv type front axles ?
    souNdguy

    sent from my NOKIA LUMIA

  4. #4
    Super Member JerryG's Avatar
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    Apr 2000
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    7,191
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    Northwest Arkansas
    Tractor
    MF 1440-4 PowerShuttle

    Default Re: 4x4 ?

    On tractors the front gears are faster than the rear. Thus the front is pulling the tractor a small amount faster. On a auto the front and rear use the same ratio or extremely close.

  5. #5
    Platinum Member Raspy's Avatar
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    Dec 2006
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    Northern Nevada
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    NH TC29DA Bolens G14 Skytrac 5028 Dodge Cummins Jeep Rubicon Grizzly 700

    Default Re: 4x4 ?

    It probably because you are on dirt and because the rear has much more traction than the front. Also, there are no springs to allow windup or bouncing. So the front slips a bit and it's no big deal. Mine does the same thing, smooth on turns even in 4WD. I notice that there is some slipping going on, but it doesn't jump like my my pickup does.

    The axle ratios are not designed to make the front pull the tractor. The difference in speed cannot be corrected with a ratio difference because the speed difference is dependent on how sharp you turn. It's always a different ratio between the front and back. They are designed to run smoothly when going straight with the correct ratio for the different size tires.
    John

    I only exaggerate enough to compensate for being taken with a grain of salt.

  6. #6

    Default

    Also if you don't have your diff locked up in the back it's only a 3x4 so your 2 front wheels and one back wheel and it's usually the outside one turning in a corner witch pushes you thru the corner my l45 will not but on 4x4 but in 4x4 with the diff locked up its a rough corner

  7. #7
    Elite Member
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    Mar 2009
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    2,989
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    Lee, IL
    Tractor
    John Deere 1070

    Default

    Quote Originally Posted by andrehoude123 View Post
    Also if you don't have your diff locked up in the back it's only a 3x4 so your 2 front wheels and one back wheel and it's usually the outside one turning in a corner witch pushes you thru the corner my l45 will not but on 4x4 but in 4x4 with the diff locked up its a rough corner
    This is kind of a misconception. An open dif applies equal torque to both wheels at all times. If there is no wheel spin, both wheels have power... even in a turn.

  8. #8
    Platinum Member
    Join Date
    Dec 2010
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    905
    Tractor
    Massey

    Default Re: 4x4 ?

    That is true. Equal torque, but likely unequal power. Confuses almost everyone.

  9. #9
    Super Star Member LD1's Avatar
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    Apr 2008
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    10,145
    Location
    Central Ohio
    Tractor
    Kubota l3400

    Default Re: 4x4 ?

    4x4 is 4x4 no matter what combination of open diffs, lockers, posi's, or spools. You may only see 2 wheels spinning, but the other two wheels are trying to drive with the exact same amount of force as the ones spinning.

    True, in can be unequal "power" if we are talking horsepower. but just "power" is too broad of a term.

    Horsepower is 0 if there is no rotation. So while torque is being applied to try to turn the wheel, if traction is great enough that it dont spin or roll, then yes, technically, there is no horsepower.

    As to why the tractor dont buck like a truck, I think it is a combination of what most others posted. First, the fronts do rotate a tad faster, so that helps. But with everything being ridgid and no suspension, they just slip and you dont know.

    There were/is exceptions to the trucks though. Old full time 4wd trucks with a 203 t-case didnt buck, cause they had a differential gear in the t-case just like the axles. It allowed one axle/driveshaft to rotate at a different speed.
    ".........there is only one way to find out."
    "Ok, hold my beer and watch this.........."


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  10. #10
    Elite Member
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    Mar 2009
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    2,989
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    Lee, IL
    Tractor
    John Deere 1070

    Default

    Have you tried it on pavement?

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