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  1. #1
    Gold Member
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    Apr 2007
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    295
    Location
    Minnesota
    Tractor
    '07 Kubota BX2350

    Default BX2350: 4WD appears to lock the rear diff

    When I put the 2350 in to 4wd, the rear tires act like I have the diff lock engaged (inside tire scrubbing during tight turns).

    I compared 4wd and no diff lock to 2wd with diff lock and the rears act the same in both cases. At first I thought the diff lock was stuck but then I put it into 2wd with no diff lock and the rears act like I'd expect them to.

    Anybody else experienced this?
    '07 BX2350, FEL w/ toothbar, 60" MMM, 5' KK back blade, 60" Farm King 3PH snowblower, 42" home built disc, carry all

  2. #2
    Platinum Member
    Join Date
    Oct 2010
    Posts
    556
    Tractor
    New Holland TC 29D

    Default Re: BX2350: 4WD appears to lock the rear diff

    Very strange, the two systems are not related in any way. I think the diff lock is sticking somehow. try putting it in 4wd and backing it up while turning and see if the the rear tires are still scuffing. Or maybe try stepping on the diff lock pedal repetedly while driving the tractor, that might loosen it up.
    TC-29DA
    BX-1500

  3. #3
    Gold Member pedalstomper78's Avatar
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    Aug 2010
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    449
    Location
    Ohio
    Tractor
    Case/IH DX33

    Default Re: BX2350: 4WD appears to lock the rear diff

    I've found this on some tractors. The inside tire will always seem like it is spinning because the outside tire will "freewheel".

    What you're seeing is a classic example of why you do not use 4WD on hard surfaces. The front wheels and rear wheels are supposed to go the same distance per revolution of the input shaft of the transmission as they have a direct mechanical connection. The gear ratios are different from the front to the rear because of the tire size differences, so you should get the idea though that 1 engine revolution = x number of feet traveled. This should be the same for the front and the rear. But what happens when you turn the tractor? The rear wheels are now taking a shorter path than the front wheels. Much like how the trailer of a semi takes a shorter path around a turn, your rear wheels do the same thing...it's just not as drastic. So when you turn your tractor, your front wheels are going farther than the rear wheels......so the rear wheels are trying to "push" the front wheels. Since the front wheels are at an angle, it's easier for the inside rear wheel to spin a bit instead of pushing the fronts too fast.

    I know it's described in a bit of a "beat around the bush" way......but did it make sense?

  4. #4
    Super Member 94BULLITT's Avatar
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    Feb 2011
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    7,088
    Location
    Frederick County, VA
    Tractor
    Kubota BX2360 & L4240 HSTC

    Default Re: BX2350: 4WD appears to lock the rear diff



    When you turn the front and rear wheels are working against each other.

  5. #5
    Gold Member
    Join Date
    Apr 2007
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    295
    Location
    Minnesota
    Tractor
    '07 Kubota BX2350

    Default Re: BX2350: 4WD appears to lock the rear diff

    PEDALSTOPMER - That does make sense.

    BULLITT - I see you have a BX also. Have you ever noticed what I've described?
    '07 BX2350, FEL w/ toothbar, 60" MMM, 5' KK back blade, 60" Farm King 3PH snowblower, 42" home built disc, carry all

  6. #6
    Veteran Member
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    Jan 2010
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    1,593
    Location
    Piedmont, NC
    Tractor
    Kubota L4610 & BX2230, Farmall Super M, Super A

    Default Re: BX2350: 4WD appears to lock the rear diff

    Jack up the back end so you can spin the rear tires by hand. With the tractor in 2wd, neutral, see if the rear wheels spin in opposite directions when you turn them manually. That's classic behavior for a standard differential and tells you it's working normally. If the diff lock is engaged, it wouldn't do that. I expect yours is fine and just applying power to the inside wheel in a turn.

  7. #7
    Super Member radioman's Avatar
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    May 2008
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    5,493
    Location
    Ontario, NY
    Tractor
    Kubota BX24

    Default Re: BX2350: 4WD appears to lock the rear diff

    I am pretty sure its a case of driving on dryer/less forgiving surface that cause you to notice the scrubbing. Mine does it that way when I am on black top turning in 4wd. same goes for turning around in a circle on dry grass and the it doesnt turn as sharp as in 2wd.

  8. #8
    Super Member 94BULLITT's Avatar
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    Feb 2011
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    7,088
    Location
    Frederick County, VA
    Tractor
    Kubota BX2360 & L4240 HSTC

    Default

    Quote Originally Posted by fish6942 View Post
    PEDALSTOPMER - That does make sense.

    BULLITT - I see you have a BX also. Have you ever noticed what I've described?
    Yes, the inisde tire on the rear will spin when it is in 4wd.

  9. #9
    Gold Member
    Join Date
    Apr 2007
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    295
    Location
    Minnesota
    Tractor
    '07 Kubota BX2350

    Default Re: BX2350: 4WD appears to lock the rear diff

    Well, it sounds like I'm OK. Next time I have it in my shop I'll try what Grandad suggests and jack up the rear and spin the tires. In addition, I'll try engaging the diff lock when in 4WD to see if there is any difference. All of this testing has been performed on a gravel driveway.

    Thanks All!!
    '07 BX2350, FEL w/ toothbar, 60" MMM, 5' KK back blade, 60" Farm King 3PH snowblower, 42" home built disc, carry all

  10. #10
    New Member
    Join Date
    Sep 2010
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    16
    Tractor
    Kubota BX1500

    Default Re: BX2350: 4WD appears to lock the rear diff

    As others have said, your machine is fine. The linkages for 4wd and Diff Lock are nowhere near each other. The binding you are feeling is normal and occurs in all 4wd vehicles. It's more noticeable on your BX because you are basically sitting on top of the rear tires.

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