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  1. #11
    Platinum Member
    Join Date
    Jan 2008
    Posts
    558
    Location
    New Martinsville WV
    Tractor
    2013 JD 3005 1974 MF135

    Default Re: 4x4 ?

    I think the suspention has a lot to do with it, or lack there of, in the case of a tractor. With the 3005 front axle engaged on pavement I can tell the front tire (s) are slipping a small amount but it doesn't buck due to there not being springs to compress and rebound. Same is true with pulling trucks in the pitts at the county fair... tire with the least traction just slips, normally the rears in that case, due to motor weight and front lockers/spools and little to no suspention.
    Greg AKA DieselCrawler
    2013 JD 3005 4x4 w/loader
    1974 MF135 diesel (dad's)
    Trucks:
    1999 F250 4x4 7.3L diesel 6sp daily driver
    2000 F350 4x4, 7.3L diesel, auto, work truck
    2000 Excursion 4x4 7.3L diesel, wife's ride
    84 Chevy K-30 turbo diesel farm truck, play truck, one ton running gear, locked up, on 39.5" boggers,
    Redheaded wife, 6 kids, 11 rabbits, 4 horses/ponies, 4 cats, 3 dogs

  2. #12
    Platinum Member Raspy's Avatar
    Join Date
    Dec 2006
    Posts
    956
    Location
    Northern Nevada
    Tractor
    NH TC29DA Bolens G14 Skytrac 5028 Dodge Cummins Jeep Rubicon Grizzly 700

    Default Re: 4x4 ?

    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
    There is no such thing as 3 wheel drive.

    Open diff means equal torque always to both wheels on an axle, but uneven speed.

    Locked diff means unequal torque to both wheels on an axle, but always equal speed.


    Look at this video, it's great:

    How Differential Gear works must see 100% - YouTube
    John

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

  3. #13
    Elite Member JasG's Avatar
    Join Date
    Jan 2004
    Posts
    3,204
    Location
    CNY
    Tractor
    Kubota L3240

    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?
    A couple reasons I can think of. As already brought up the front wheels are spinning faster (faster ground speed) than the rear. The older 4 wheel drive tractors would "buck" as you put it, like the oldest IH 66 series. Older tractors were much like truck, same ground speed, no planetary, single U-joints at the wheels. The newer tractors I have driven have a doubled up U-joint at the wheel where truck would have a single at each wheel. This doubled joint gives it 2 pivots and eliminates the binding. I believe this is called a double cardan joint or shaft.

    Item 10 in the 5th picture is the front axle shaft assembly and you can see the 2 U-joints out at the end of the shaft. This gives a much tighter turn without the binding hop.
    Tractor parts and attachments: Dana front axle

    If you drive in 4wd on a concrete floor, the front tires should leave a mark on the floor. Or if you can shift on the fly you can feel the fronts come on, on a 4wd. This would be from the 2%-5% faster ground speed the tires should have.

    Smaller utility and compacts use a different front axle altogether that allows a very tight turn with no binding.
    Last edited by JasG; 11-10-2013 at 09:13 AM.
    “Government is like a baby. An alimentary canal with a big appetite at one end and no sense of responsibility at the other."


    Ronald Reagan

  4. #14
    Platinum Member Mark Page's Avatar
    Join Date
    Sep 2009
    Posts
    559
    Location
    Maryland
    Tractor
    Massey Ferguson 2615 48hp, 4wd, loader

    Default Re: 4x4 ?

    Dosen't seem to matter what surface it's on. Macadam drive or grass or stone.
    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.


  5. #15
    Elite Member JasG's Avatar
    Join Date
    Jan 2004
    Posts
    3,204
    Location
    CNY
    Tractor
    Kubota L3240

    Default Re: 4x4 ?

    Quote Originally Posted by Mark Page View Post
    Dosen't seem to matter what surface it's on. Macadam drive or grass or stone.
    With the bucking you refer to it won't matter what surface you drive on. If you drive on concrete though in a straight line in 4wd your front tires should leave black marks from the fact they are spinning at a faster ground speed than the rear.
    “Government is like a baby. An alimentary canal with a big appetite at one end and no sense of responsibility at the other."


    Ronald Reagan

  6. #16
    Super Member Gary Fowler's Avatar
    Join Date
    Jun 2008
    Posts
    7,853
    Location
    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: 4x4 ?

    The tires dig much more in a turn in 4WD than in 2 WD. I think this is the reason you don't feel the bucking as they just dig into the dirt. I can tell by the sound it makes in 4 WD if on a hard surface that it is somewhat binding up due to different rotational speed from front to back. I know the fronts are constantly spinning from the wear on the fronts with non on the back of my LS. It isn't as obvious on the kubota I think due to the R4s and much lighter tractor. I think the bucking is as others have stated, more U joints and springs to wind up on an automobile while nothing on the tractors.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  7. #17
    Super Star Member dave1949's Avatar
    Join Date
    Apr 2009
    Posts
    10,574
    Location
    Industry, Maine
    Tractor
    New Holland TC40

    Default Re: 4x4 ?

    I can feel a little bucking on my NH TC40 on hard dirt with a load in the bucket and a making tight turn. I try to avoid that with more gentle turns or shift to 2WD.

    I assume the load and surface make it harder for the front wheels to do the normal slipping.
    "Those were the days my friend, we thought they'd never end ..."
    When there is a huge solar energy spill, it is called a "nice day"!

  8. #18
    Veteran Member
    Join Date
    Feb 2007
    Posts
    1,128
    Location
    easten Colorado
    Tractor
    JD 4020

    Default Re: 4x4 ?

    I do not know how tractors are set up, but some of the old military trucks, had a over running clutch in the transfer case, that only engaged the front axel when it was slipping, and when put in reverse there was a shift lever in the case that switched to the reverse clutch, and they do nt crab either but the all wheel drive is operatable when any time the rears are turning faster than the fronts, by a few percent, other wise they were basically just free wheeling

    the other possible is s transfer case differential

    It is possible this type of design could be incorporated in to your tractor,

  9. #19
    Silver Member ksbrdmkr's Avatar
    Join Date
    Aug 2013
    Posts
    131
    Location
    Paola, KS
    Tractor
    NH TN55S, DK45SE Cab,

    Default Re: 4x4 ?

    Most CUT front drive is of the drop spindle type? where my larger 4x4 tractor has a straight front axle with u-joints that do buck when turned to tight.
    NH TN55S, Kioti DK45SE, Kubota G4200HST, Grasshopper 618, Ford E350 power stroke, Jeep Comanche

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