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  1. #1
    Silver Member
    Join Date
    Oct 2006
    Posts
    158
    Location
    Sedro-Woolley, WA
    Tractor
    Kabota

    Default 4WD locked up

    I have a B7100 and fairly steep acreage. I have been using the tractor in 4WD about 95% of the time to avoid slipping on the underbrush and ditches.
    This winter I drove to a friends about 2 miles away and found I couldn't disengage the front drive for road travel.
    The tractor is stored outside in the weather (bad me) and I assume the lever or mechanism is rusted but I don't want to damage it by just hammering it into position.
    Does anyone have a suggestion on how to dismantle or grease the lever to allow it to work? I can live with only the 4WD but would prefer the 2WD option occasionally.

  2. #2
    Bronze Member razor's Avatar
    Join Date
    Jul 2006
    Posts
    71
    Location
    canada
    Tractor
    Kubota L 6060(2), L 5740 (1)

    Default Re: 4WD locked up

    I'm not sure about your B7100 but with my L5030 and L5740 I sometimes have to turn the steering wheel from right to left while disengaging the 4wd lever. This works every time for me.

  3. #3
    Super Member RadarTech's Avatar
    Join Date
    Feb 2008
    Posts
    5,087
    Location
    North Carolina
    Tractor
    2007 Kubota L3400

    Default Re: 4WD locked up

    Knotbored,
    I read something like this in another thread.

    Can't seem to find it though..
    He took a heat gun, warmed up the metal.

    and then used some penetrating oil soaked it..
    firm toothbrush and scrubbed to remove crud..
    ( I don't remember a mention of rust).

    Pulled up and pushed down a few times.

    Warmed, soaked, repeat.

    this seems plausible..
    If it was cold out, ice around the parts-- Frozen, oil would displace it and the heat would be enough to make it maliable..

    But I don't know much about the 3030..
    I did just check my L3400 and this seems to be a good start..

    I could see my almost new (150 hours) 3400 have problems with something like this..
    It is almost never out of 4WD..

    On the 3400, there have been occasions where I have had to back up and go forward inorder to drop out of 4WD- But I did this when not on perfectly level ground...


    Let us know how you get along...

    Later,
    J

  4. #4
    Platinum Member
    Join Date
    Apr 2007
    Posts
    686
    Location
    Northern Lower Michigan
    Tractor
    Kubota B3030HSDC

    Default Re: 4WD locked up

    Drive backwards a little and see if you can get it out of four wheel drive.

  5. #5
    Silver Member Sherweld's Avatar
    Join Date
    May 2008
    Posts
    174
    Location
    Allyn, WA
    Tractor
    Kubota B7100

    Default Re: 4WD locked up

    If you have a FEL, lift the front wheels free of the ground to see if that helps.

    I have found with both of my B7100s (past and present) that sometimes it takes a little persuading to tickle the selector out of 4WD. The gearing on the B7100 is such that the front wheels are geared to travel somewhere around 5% further than the rears while in 4WD. This does tend to bind up the gearing a bit while traveling on a firm surface. So anything you can do to "unbind" the gearing is a plus for getting the selector lever out of 4WD.

    Hope that helps ... best regards
    Sherweld
    Kubota B7100
    Westendorf TA-55 FEL
    Woods 60" Back Blade
    Howard HN Rotovator
    Howse 48" Hinged Box Blade

  6. #6
    Silver Member Foothill Rancher's Avatar
    Join Date
    Jul 2008
    Posts
    108
    Location
    Foothills of Sierra Nevada
    Tractor
    Kubota L4400 2 Ford 8n's

    Default Re: 4WD locked up

    As stated above back up, it's in a bind and backing will get it back to normal, If it's run on a hard suface that won't allow the wheels to slip it will bind.

  7. #7
    Gold Member
    Join Date
    May 2008
    Posts
    317
    Location
    SW Washington
    Tractor
    L2550

    Default Re: 4WD locked up

    I have found that when my front tires (L2550DT) become worn, it is harder to shift in and out of 4WD because of the bind in the drivetrain. When the fronts are worn, I think the front driveline is wanting to spin faster than the rear wheels. Because of the weight on the rear tires of mine (Calcium filled), in 4WD the rears dictate the speed that the front wheels will spin.

    Make sure your front tires a fully inflated.This will make them as tall as possible.

    You say you keep it in 4WD most of the time. I think this can cause the front tires to wear at an accelerated rate. Use it when you need it.

  8. #8
    New Member
    Join Date
    Dec 2008
    Posts
    22
    Location
    New Brunswick, Canada

    Default Re: 4WD locked up

    I back up a bit, and it usually does the trick. I have to do this with most cars/trucks/tractors I operated with AWD commands.

  9. #9
    Silver Member
    Join Date
    Feb 2006
    Posts
    178
    Location
    Southern MD
    Tractor
    Kubota B3030

    Default Re: 4WD locked up

    I agree with Sherweld. The easiest way to get the tractor out of 4wd is to lift the front tires off of the ground with the loader.

  10. #10
    Super Member
    Join Date
    Apr 2000
    Posts
    6,432
    Location
    central New York
    Tractor
    all makes and models

    Default Re: 4WD locked up

    Air pressure is the easiest way to compensate for tire diameter wear or improper tire matches.

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