Torque settings on wheel lugs/bolts
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Thread: Torque settings on wheel lugs/bolts

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    Torque settings on wheel lugs/bolts

    Hello,
    I joined this forum before buying my tractor and in the end went with one that I could purchase used, which limited my choices. So please forgive me for asking a "non-green" question here (but I think it actually applies to the one series as well).

    For a BX 2380, the owners manual says front wheels torque between 110 and 132 pounds. The rears are torqued between 80 - 96 pounds.

    1. Why such a large range between min/max specs?
    2. Why are the fronts torqued more than the rears?
    3. I saw a video where the guy said the nuts on the rear are torqued differently than the bolts, but I don't see anything in the manual that differentiates.

    thanks for any and all input and feedback

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    PaDave's Avatar
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    Quote Originally Posted by fransser View Post
    For a BX 2380, the owners manual says front wheels torque between 110 and 132 pounds. The rears are torqued between 80 - 96 pounds.

    1. Why such a large range between min/max specs?
    2. Why are the fronts torqued more than the rears?
    3. I saw a video where the guy said the nuts on the rear are torqued differently than the bolts, but I don't see anything in the manual that differentiates.

    thanks for any and all input and feedback
    1. I can't tell you why there is given a range on the torque, maybe dry verses lubricated. IDK You'll have to quiz a Kabota tech on that one.
    2. Are the front wheel lugs/bolts a larger diameter than the rears? A lot of things affect suggested torque, steel qualities, temper, pitch of the thread and the diameter of the stud....or the number of fasteners.
    That's the best I can come up with with my 4 active brain cells.
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    Quote Originally Posted by fransser View Post
    Hello,
    I joined this forum before buying my tractor and in the end went with one that I could purchase used, which limited my choices. So please forgive me for asking a "non-green" question here (but I think it actually applies to the one series as well).

    For a BX 2380, the owners manual says front wheels torque between 110 and 132 pounds. The rears are torqued between 80 - 96 pounds.

    1. Why such a large range between min/max specs?
    No way to explain the range. I checked the manual myself and see what you mean. If you are concerned, torque them to the lesser end of the torque range.

    2. Why are the fronts torqued more than the rears?
    According to the parts book, the front uses larger bolts. According to the parts listings the front bolts are 9/16-inch. The rear nuts AND bolts are 1/2-inch.

    3. I saw a video where the guy said the nuts on the rear are torqued differently than the bolts, but I don't see anything in the manual that differentiates.
    Given that the rear nut AND bolt are the same size (1/2-inch) it would seem logical that they would both have the same torque spec.
    Last edited by jgayman; 09-10-2019 at 03:22 PM.
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    Captain Hook Kennyd's Avatar
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    You could always ask here too:

    https://www.orangetractortalks.com/forums/
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    Quote Originally Posted by fransser View Post
    Hello,
    I joined this forum before buying my tractor and in the end went with one that I could purchase used, which limited my choices. So please forgive me for asking a "non-green" question here (but I think it actually applies to the one series as well).

    For a BX 2380, the owners manual says front wheels torque between 110 and 132 pounds. The rears are torqued between 80 - 96 pounds.

    1. Why such a large range between min/max specs?
    2. Why are the fronts torqued more than the rears?
    3. I saw a video where the guy said the nuts on the rear are torqued differently than the bolts, but I don't see anything in the manual that differentiates.

    thanks for any and all input and feedback
    Regardless of the reason, I would follow the torque guidelines as the damage can be severe when there is a loose wheel or one comes off.........they must have a reason and perhaps someone on the Kubota forum can explain it.

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    Quote Originally Posted by Kennyd View Post
    You could always ask here too:

    https://www.orangetractortalks.com/forums/


    I did! Received fewer responses there!
    jgayman likes this.

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    Quote Originally Posted by fransser View Post
    Hello,
    I joined this forum before buying my tractor and in the end went with one that I could purchase used, which limited my choices. So please forgive me for asking a "non-green" question here (but I think it actually applies to the one series as well).

    For a BX 2380, the owners manual says front wheels torque between 110 and 132 pounds. The rears are torqued between 80 - 96 pounds.

    1. Why such a large range between min/max specs?
    2. Why are the fronts torqued more than the rears?
    3. I saw a video where the guy said the nuts on the rear are torqued differently than the bolts, but I don't see anything in the manual that differentiates.

    thanks for any and all input and feedback
    1. No clue why they gave you a range.
    2. Looking at pics, it appears the front wheels have 4 bolts where the rears have 5. The way a wheel holds the weight of the vehicle is from the friction between the wheel and mating surface on the vehicle. The friction is created by the clamping force created by the bolts/nuts. More bolts, holds more weight. Higher torque, holds more weight. More bolts with less torque can hold the same weight as fewer bolts with more torque.
    3. Dunno

    PS: #2 is why you should be very careful with any paint or lubricant on the mating surfaces between the wheel and vehicle. Anything that might allow slippage will reduce the load carrying ability.
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    Quote Originally Posted by PaDave View Post
    1. I can't tell you why there is given a range on the torque, maybe dry verses lubricated. IDK
    NEVER lubricate the threads of a bolt/nut that will be torqued to a certain spec. The friction of the threads is part of the torque value.
    Last edited by DanW; 09-11-2019 at 03:43 PM.
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    Quote Originally Posted by DanW View Post
    NEVER lubricate the threads of a bolt/nut that will be torqued to a certain spec. The friction of the threads is part of the torque value.
    It all depends on the equipment and the spec. Some bolts/nuts specify that a lubricant be applied prior to torquing.
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    Quote Originally Posted by DanW View Post
    1. No clue why they gave you a range.
    2. Looking at pics, it appears the front wheels have 4 bolts where the rears have 5. The way a wheel holds the weight of the vehicle is from the friction between the wheel and mating surface on the vehicle. The friction is created by the clamping force created by the bolts/nuts. More bolts, holds more weight. Higher torque, holds more weight. More bolts with less torque can hold the same weight as fewer bolts with more torque.
    3. Dunno

    PS: #2 is why you should be very careful with any paint or lubricant on the mating surfaces between the wheel and vehicle. Anything that might allow slippage will reduce the load carrying ability.
    I think we already established the reason back in response #3. The front bolts are larger in diameter than the rear bolts - therefore they get torqued to a higher value.

    Likewise with #3... the nut and bolt are the same size so they get torqued to the same value.
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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