Front wheel drive question on 1025R
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    Front wheel drive question on 1025R

    I have recently purchased a 1025R when I put it four wheel drive sometimes both front wheels will drive and other times only one of the wheels will drive.My dealer says this is normal, but it doesnt seem right to me. Are both front wheels suppost to drive when in four wheel drive mode ? If not then why do they both drive alot of the time in the same conditions ? Thanks for your help.

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    56FordGuy's Avatar
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    Short answer, this is normal. The differentials on the tractor are open to allow it to turn. You can temporarily lock the rear diff with the pedal but not the front.
    -Blake

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    If this is normal could you explain to me why if Im say pushing dirt and only one front wheel is driving and I back up a couple of feet and go forward then both front wheels will drive.Sometimes both wheels will drive when Im turning and other times they dont. It seems very strange that its so intermitten.Thanks again

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    Quote Originally Posted by RAMER 13 View Post
    Sometimes both wheels will drive when Im turning and other times they dont. It seems very strange that its so intermitten.
    You'll probably notice it more when turning than at other times. When turning, one wheel is spinning more than the other. (The outside tire has farther to travel then the inside tire.) The tractor's differential senses this but it doesn't know that you are trying to turn. It assumes that the difference in tire spin rates means that one wheel is slipping so it will apply power to the opposite wheel. But it doesn't transfer ALL power. It will apply in varying amounts until the "slipping" stops and the wheels are turning at the same rate again - usually when you straighten the machine out...

    You'll notice it sometimes and not other times because of the different surfaces you might be on, how hard you are turning, how fast you are moving, etc... When the magic ratio of left wheel:right wheel "out of sync" is hit, the differential will kick in. If it isn't reached, the differential just lets things go.

    (This is really a pretty crude explanation but... it would take pages to go through all of the possible scenarios.)
    Last edited by JimR; 09-11-2015 at 12:47 PM.
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    Take a look at this video:

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    If it's a new tractor and you think it's not right, call your dealer.
    Last edited by Creekdrifter; 09-11-2015 at 03:39 PM.
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    Quote Originally Posted by RAMER 13 View Post
    I have recently purchased a 1025R when I put it four wheel drive sometimes both front wheels will drive and other times only one of the wheels will drive.My dealer says this is normal, but it doesnt seem right to me. Are both front wheels suppost to drive when in four wheel drive mode ? If not then why do they both drive alot of the time in the same conditions ? Thanks for your help.
    What are you using to determine if one or both wheels are transmitting power?

    Depending on tractive conditions, one or both tires can spin/slip. If one tire gets good traction it will not spin, but still provide power or pulling force, but only as much force as the other tire/wheel that is slipping, because of the differential.
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    Quote Originally Posted by Kennyd View Post
    Take a look at this video:

    I love that video. I first saw it a few years ago and I can honestly say I didn't truly understand a differential before watching it.
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    If front wheels are "spinning" (slipping), ease off the FWD pedal and engege the rear traction lock. This will give you constant 3 wheel drive (straight ahead) when FWD is engaged. Of course, you can still run out of forward traction in some situations.

    Like the traction lock, it's always good practice to disengage FWD when turning tight w/loaded bucket or don't really need it... like on solid pavement. Sometimes it requires touching the REV pedal to disengage FWD. After a while it becomes second nature to flick it in and out of FWD as needed such as plowing snow, etc...
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    Quote Originally Posted by RAMER 13 View Post
    If this is normal could you explain to me why if Im say pushing dirt and only one front wheel is driving and I back up a couple of feet and go forward then both front wheels will drive.
    The wheel will only slip when the force applied exceeds the available traction. If a front wheel slips it only means that the slipping side has less traction than the non-slipping side - since it is an open differential the side with less traction will spin. Unless the conditions are perfect you will not be able to get both front wheels to slip at the same time.
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