JD 790 MWFD front axle, wheel falls off.
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Thread: JD 790 MWFD front axle, wheel falls off.

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    JD 790 MWFD front axle, wheel falls off.

    hello everyone

    I am new here and hope I'm posting in the right category. with that being said here is the problem.

    My front left tire keeps falling off. The snap ring on the spindle shaft keeps popping off. When it first happened about a year or so ago I tore the hub down and saw from years of use the gears inside the hub had broken teeth on them. We decided to replace all bearings and bushings as well as the gears. Thought all was well but it fell off again. I figured out I forgot to put a bearing back in. I thought I did everything right the last time, but was proven wrong when about two weeks ago it fell off while my dad was using it.

    Is this a problem that other people have came across or am I just unlucky and have an issue that goes past the hub and into the Front DIff


    Thanks in advance

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    theduke's Avatar
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    Mines a 955...probly the same front axel though.

    I've replaced the gears ( look like spider gears from a rear differential).

    This was on 1 side only ...I forget which.
    Probly drivers side as its the one that spins when things get out of whack.
    Typicly the passenger side is doing the work from what I see from the seat.

    Had the dealer do this along with the seals...price was cheap by todays standards.
    This was at least 10 yrs ago and around 500 bucks iirc.

    Someone will likely post a parts diagram for you shortly.

    How did you forget a bearing
    Last edited by theduke; 04-10-2019 at 11:26 PM.
    BigJim55 likes this.
    Dan


    JD 955 ,70A loader, 60" mmm , Original I-match ,4' woods B hog , 5' Box blade , 12' orchard plane/driveway grader ,various other doo-dads & homebuilt implements. Goossen BFBlower, JakeRake..this thing is different.
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    I forgot the bearing between the tear down to the replacement was a couple of months and a few military drills in between. Just one of those things that happen. Been turning wrench’s since I was knee high to a grass hopper and been doing it full time for the past 17 years.

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    How often do you use the tractor with 4WD engaged?

    Put it all together again,, then use it with only 2WD,, except for the instant the tractor is stuck,
    then only engage the 4WD for the 10 seconds needed to free the tractor.

    I have seen neighbors that had similar damage from using 4WD on dry soil,,,
    Some of the tractors include JD 4105, JD 855, JD 650,,,, and,,, the IH 584 4WD
    My favorite attachment is the homemade landplane,,, EVERYONE needs one of those!!

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    We used it mainly when using the front end loader going into a pile, when we would get in a bind in a wet spot in a field, or when we had our disk hooked to it in the garden because it would bog the tractor down in loose soil. Other than that it stays in two wheel.
    RTHanes likes this.

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    The disc won’t go back on that tractor any more since we picked up a 1988 Ford 3910 50 horse tractor that is in great working shape

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    2018JD's Avatar
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    Howdy Brother-In-Arms....
    Check the spindle. See if the Groove that holds the Snap Ring in is in good shape. If it's worn/round out, then the Ring won't seat far enough down to lock into place. It will keep popping out.
    There should also be some sort of Spacer that fits between the Snap Ring and Bearing to separate the two.... Also... check to see if the Ring is the correct one. If you bought the tractor used, chances could be some "Farm Mech Monkey" slapped one in that "Looks Close".....

    I don't have a Parts Breakdown Diagram handy to see for sure, I'll try to find one You may just have to get a new spindle.
    rtgt likes this.
    MSG/E8 U.S. ARMY RETIRED (26 yrs)

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    2018JD's Avatar
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    So.... Found parts diagram for JD 790 at Deere....

    Not sure what Breakdown you need... Front axle diagram ST562535... might be ???

    Check here to get into the diagrams....

    John Deere Parts Catalog

    John Deere Parts Catalog

    P.M. me if you got any more Questions.... or at least give me Reference to what "ST" you are using and part #.... we'll go from there....
    Gizmo2 and rtgt like this.
    MSG/E8 U.S. ARMY RETIRED (26 yrs)

    1972 John Deere 112 (refurbed myself) Electric Lift, Electric PTO, 49" Deck
    2018 JD 2032R 220R Quick Mount Loader, 270B Backhoe, Quick Hitch, 2060 Box Blade, 2060 Rotary Mower, Quick Mount Fork Attachment, Leinbach Post Hole Digger w/ 6"/9"/12" augers, Titan 60" Landscape Rake, Power Beyond Kit, Canopy, Factory Engine Heater , R4 Industrial w/Ballast, ..AND.. 10 Year Drive Train/Maintenance Warranty

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    Just tore down my 790 hub

    Quote Originally Posted by 2018JD View Post
    So.... Found parts diagram for JD 790 at Deere....

    Not sure what Breakdown you need... Front axle diagram ST562535... might be ???

    Check here to get into the diagrams....

    John Deere Parts Catalog

    John Deere Parts Catalog

    P.M. me if you got any more Questions.... or at least give me Reference to what "ST" you are using and part #.... we'll go from there....
    I replaced a seal in my 790 last weekend. It's just a snap ring holding things together and if you don't get everything back exactly right, that snap ring won't fully engage. Then it's friction on the gear and bearing keeping it together which probably will work for a while.

    Here is the procedure:
    Click image for larger version. 

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    Treefarmer
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    2018JD (04-27-2019)

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    Hooray Treefarmer....
    Good thing you happened along. Just what was needed.
    Treefarmer likes this.
    MSG/E8 U.S. ARMY RETIRED (26 yrs)

    1972 John Deere 112 (refurbed myself) Electric Lift, Electric PTO, 49" Deck
    2018 JD 2032R 220R Quick Mount Loader, 270B Backhoe, Quick Hitch, 2060 Box Blade, 2060 Rotary Mower, Quick Mount Fork Attachment, Leinbach Post Hole Digger w/ 6"/9"/12" augers, Titan 60" Landscape Rake, Power Beyond Kit, Canopy, Factory Engine Heater , R4 Industrial w/Ballast, ..AND.. 10 Year Drive Train/Maintenance Warranty

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