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Thread: Unusual term...

  1. 6th November 2007, 08:06 PM #1
    B92 8NW
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    Unusual term...

    Trying to work out how to use the part time 4wd system and axle differential locks on the Kubota.

    Basically the rear diff lock is a pedal that you hold down with the right foot. This can be used in 2wd mode or 4wd mode. The manual says:
    "Apply the rear axle differential lock pedal when the tractor cannot move because of excessive individual wheel spin, or when one rear wheel is caught in loose soil and cannot move due to wheel spin."

    OK that all makes sense. It goes on...

    "Only engage the 4wd lever when greater traction power is required or to prevent the tractor from lunging"

    What is meant by "traction power" and "lunging"?

    On our rovers would we not use the CDL (or 4wd on a part time system) BEFORE using a rear diff lock?

    So what it's saying is:
    1. If you get stuck, first use the rear locker to try and get moving.
    2. If that doesn't work, engage 4wd.
    3. If that doesn't work, engage both.

    When towing timber however in 2wd, it easily looses forward traction cornering... and you shouldn't use the rear locker whilst cornering... so does this fall under "greater traction power" and necessitate 4wd?

    Any Kubota owners that can clear this up?
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  2. 6th November 2007, 08:33 PM #2
    waynep
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    Quote Originally Posted by joel_nicholson View Post
    On our rovers would we not use the CDL (or 4wd on a part time system) BEFORE using a rear diff lock?
    On a Landy you would, because if you only engage a rear diff lock without engaging CDL, because of the centre diff action you could still end up with only one driven front wheel ( I am pretty sure anyway, someones bound to correct me )

    However on your "part time 4WD" like an old hilux you could engage rear diff lock first, which would give you rear wheels locked, but not "4WD". So that's still better than "one wheel drive".

    It depends if your tractor is part time or full time 4WD ( ie does it have a centre diff TC or just switch in drive to the front axles ?)
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  3. 6th November 2007, 08:37 PM #3
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    Blknight.aus
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    lunging (as I understand it) is exactly that the front of the tractor will lift a bit the excess weight pulls harder at the back wheels and they drop down as you get some forward motion, when they hit that little extra bit is lost and you stop so the front wheels climb again and then fall. If you have it in 4wd when they hit they also pull and thats enough to help stop lunging...

    Lunging in that fashion is a hairs bredth away from getting into a backwards roll over.

    Traction power in this instance appears to be a fancy term for all wheels driving.

    From memory the lower end of the kubota range are 4 wheel drive like a series rover is a 4 wheel drive. (tree lopping firm I was spannering for in townsville had a bota and a some freaky aircooled jobbie). Number of times I saw the bota with the front wheels 4 feet + in the air...
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  4. 6th November 2007, 08:39 PM #4
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    rovercare
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    Quote Originally Posted by waynep View Post
    On a Landy you would, because if you only engage a rear diff lock without engaging CDL, because of the centre diff action you could still end up with only one driven front wheel ( I am pretty sure anyway, someones bound to correct me )

    However on your "part time 4WD" like an old hilux you could engage rear diff lock first, which would give you rear wheels locked, but not "4WD". So that's still better than "one wheel drive".

    It depends if your tractor is part time or full time 4WD ( ie does it have a centre diff TC or just switch in drive to the front axles ?)
    ^^^correct, the tractor is part time to

    Depends on the situation, we try to be light on, as the old boys has a 4 in 1 bucket thats to big for the tractor (B7200) and have been through 2 front diff's

    But generrally if no loader use whatever for each situation, i'll generally use 4wd first, then diff lock
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  5. 6th November 2007, 10:35 PM #5
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    this sounds like a question for hiline........




    mr kubota.......
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  6. 6th November 2007, 10:57 PM #6
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    hiline
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    Quote Originally Posted by DEFENDERZOOK View Post
    this sounds like a question for hiline........




    mr kubota.......

    shut your eyes
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    full noise.....and go man go

    other than that sorry i cant help
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  7. 7th November 2007, 07:10 AM #7
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    In the context that you are using the tractor to tow an implement, say a plough, you would not usually have front wheel drive engaged due to increased difficulty turning and unnecessary strain on the drivetrain. When you begin to lose traction you can easily engage the diff lock to gain traction and keep moving. Most smaller four wheel drive tractors are classed as front wheel assist rather than four wheel drive and the front drive train is designed for better stability and traction in muddy conditions when you are doing lighter work that does not have a heavy drawbar load, eg towing a trailer of hay through a boggy paddock.
    So the two traction aids are generally used for different purposes.
    Regards,
    Tote
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