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  1. #11
    Veteran Member xring100's Avatar
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    Livingston County, Michigan
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    Kubota M8540, ZD1211 60"

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    Quote Originally Posted by azbinder View Post
    These are cast weights and have holes around the center to bolt it to the wheel disc and then notched holes around the outer edge to stack several weights together. You might be able to bolt two weights, one inside the disc and the second inside the disc/ Use 3 bolts to go all the way through the disc and both weights. Then you can stack two or three weights on the inside and outside. Upwards of 500# per side. I just don't know how much stress it would put on the rear end of the tractor. When you add liquuid to the tires, the weight bacically goes directly to the ground.
    The load path between weights and tire ballast is the same. Same effect on axle

    Dave

    Dave

  2. #12
    Silver Member
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    Jul 2012
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    117
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    Dewey, AZ
    Tractor
    Kubota B7800

    Default Re: Need help with wheel weights for Kubota L3830

    Just reread my post. I need to do a better job of proof reading them.
    Ment to say: Install one weight on the OUTSIDE and one on the INSIDE and bolt them together sandwitching the disc between the weights.
    Mike
    B7800 "Drowned Rat"
    It spent 6 weeks under water

  3. #13
    Elite Member vtsnowedin's Avatar
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    Jul 2011
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    central Vermont
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    John Deere 5045E

    Default Re: Need help with wheel weights for Kubota L3830

    Quote Originally Posted by xring100 View Post
    The load path between weights and tire ballast is the same. Same effect on axle

    Dave
    Sorry to say but you are wrong on this. The reaction point for the fluid fill is at the bottom of the tire on the inside of the tread. It places no load on the bearings unless the tire is up in the air which seldom happens. A cast iron weight has a reaction point at the axle hub and pulls down on the wheel bearings all the time.

  4. #14
    Veteran Member
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    Success Missouri
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    Kubota L3800DT, L3750DT Shuttle

    Default Re: Need help with wheel weights for Kubota L3830

    Quote Originally Posted by vtsnowedin View Post
    Sorry to say but you are wrong on this. The reaction point for the fluid fill is at the bottom of the tire on the inside of the tread. It places no load on the bearings unless the tire is up in the air which seldom happens. A cast iron weight has a reaction point at the axle hub and pulls down on the wheel bearings all the time.
    You might want to rethink that a bit. Weight bolted to a rim puts weight on the tire that's sitting on the ground. The weight of the tractor is the only weight on the wheel bearings...
    Don
    Kubota L3750 Hydro Shuttle, 4wd, FEL; L3800 Gear drive, 4wd, FEL
    Husqvarna XP chainsaws 346xp X3, 357xp, 562xp, 359

  5. #15
    Elite Member
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    Sep 2007
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    2,813
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    Doniphan, Mo.
    Tractor
    Kubota L4240, B7800 & BX2660

    Default Re: Need help with wheel weights for Kubota L3830

    I'm missing something? If a wheel is 10lbs or a 1000lbs it isn't pulling anything down. When you bolt it to the tractor what is it pulling on? Now when the rear comes up it's pulling on the tractor. The deal is not put so much that you bend the axle when you try to get the wheel up.

  6. #16
    Elite Member vtsnowedin's Avatar
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    central Vermont
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    John Deere 5045E

    Default Re: Need help with wheel weights for Kubota L3830

    The difference comes from the nature of fluids which exert there weight in all directions at any given depth equally. Gravity is what is pulling down and the reaction force (from the ground upwards against the tire) has to balance force for force or motion will occur. That is why the math is called statics. The fixed iron weight does exert its weight all the way to the ground through the rim and tire but it's path goes through the hub bearings. the fluid is free to flow around the hub and only exerts its mass on the inside of the tire contact patch. I'm not a teacher so perhaps that is not the most instructive explanation but if you look it up I'm sure you will find I'm right.

  7. #17
    Super Member
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    central New York
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    all makes and models

    Default Re: Need help with wheel weights for Kubota L3830

    Quote Originally Posted by vtsnowedin View Post
    The difference comes from the nature of fluids which exert there weight in all directions at any given depth equally. Gravity is what is pulling down and the reaction force (from the ground upwards against the tire) has to balance force for force or motion will occur. That is why the math is called statics. The fixed iron weight does exert its weight all the way to the ground through the rim and tire but it's path goes through the hub bearings. the fluid is free to flow around the hub and only exerts its mass on the inside of the tire contact patch. I'm not a teacher so perhaps that is not the most instructive explanation but if you look it up I'm sure you will find I'm right.
    For what you are saying the top half of the weight is above the bearing so the load would be reduced by 1/2! That is with your thoughts.. Now when the tire is rolling and the liquid filled tire possibly has the liquid so that it is in the upper part of the tire, then where is the weight, uselessly in the air?

  8. #18
    Veteran Member xring100's Avatar
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    Kubota M8540, ZD1211 60"

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    So your trying tell me that if i unbolt the wheel from the axle and roll the wheel out of the way with the weights still kept in the upright position on the wheel. That the weights on the wheel are putting load on bearings. There is the possibility in the case where you lift a rear wheel off the ground that you could create a slightly larger moment due to the placement of the weight. But this would be small in terms of what the axle is used to. But normally when the tires in contact with the ground as intended the tire then wheel support both the wheel weights and the tractor. Main difference between tire and wheel weight is the load path through the assembly. Tire ballast is only held up by the tire

    Dave

    Dave

  9. #19
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    Weight in or on the tires or rims have little effect on the bearings. The affect is only from the change in inertia. More weight makes it harder to start and stop rotation, requiring slightly more force. Very small difference,but a difference.

    I would add the fill to the tires. The up sidr far out weighs the down.

  10. #20
    Veteran Member
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    Kubota L3800DT, L3750DT Shuttle

    Default Re: Need help with wheel weights for Kubota L3830

    Any and all weight added to the rim is transferred to the tire, then to the ground.

    It can have an effect on the axles and bearings as the tractor is used. But it's NOT pulling down on the wheel bearings, unless one or both rears are off the ground, or are trying to be lifted off the ground.

    The ONLY weight on the wheel bearings, is the weight of the tractor and any weight added to the 3 pt hitch.
    Don
    Kubota L3750 Hydro Shuttle, 4wd, FEL; L3800 Gear drive, 4wd, FEL
    Husqvarna XP chainsaws 346xp X3, 357xp, 562xp, 359

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