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Broken Axle - what happened!!!???

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  • Broken Axle - what happened!!!???

    Hi everyone,

    I am hoping that some of you can shed some light on an issue that I ran into. I have a 99 Max IV. I snapped the left rear axle (right under the engine) when starting from a dead stop. It didn’t go through any serious torture in the past, so needless to say it was a shock when it broke. I talked to RI and they are sending out a new axle and sprocket set (one piece). From what I learned, during the 1999 year when they changed axles there was a design that had 2 separate axles instead of a one piece unit. As you can see from the picture, my axle broke right between the two sprockets (which is what RI had guessed when I told them it broke.)

    My questions are as follows:

    - Has anyone else had a failure like this? It surprised me to say the least, but I really wasn’t beating the heck out of it which might have caused this to happen.
    - Should I expect any of the other axles to break? Unfortunately I do not have the ATV with me as it is in my buddies shop and I forget what the other side looks like. Is the right axle and sprocket assembly the same? If so, is it likely that will fail as well?
    - I will be doing some plowing this winter. Would that put some additional stress on the axles and cause it to break?
    - Once I get the axle replaced, I’m sure I’m going to baby the heck out of it because I’m worried of other axles failing. Should I be that concerned?
    - Looking at the picture, does this failure look “normal?” It seems that the metal was almost crystallized or that the forged component was faulty? Thoughts?

    Any comments that you have would be appreciated. The Max has about 300 hours on it.

    Thanks.
    Attached Files

  • #2
    The axle snapped due to metal fatigue. This axle didn't "just" snap from a normal state. It has been building up to that point over time.

    The new axle and sprocket hub should eliminate this because of the one piece design.......relax

    Comment


    • #3
      Also, chain tension plays a big role. If you're adjusting your chains with the wheels on the ground, you may have too much tension on the chains increasing the fatigue on the axle.

      Comment


      • #4
        Thanks for the info. If this helps, I thought I heard a weird almost grinding noise when turning hard to one side (I don't remember the side) You could hear the noise for a few weeks. I'm wondering if that was the start of it all. In your experience, would you replace the other axles where there could be a weakness, or wait until they fail? I'd just hate for one of them to fail in the middle of plowing or something. Thanks again.

        Comment


        • #5
          Originally posted by mark m. View Post
          The axle snapped due to metal fatigue. This axle didn't "just" snap from a normal state. It has been building up to that point over time.

          The new axle and sprocket hub should eliminate this because of the one piece design.......relax
          That is the strangest failure I have seen in a while. The axle failure point looks like a piece of rope. Very strange. Most fatigue failures I have seen you can usually pick out the failure start point.
          Acta non verba

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          • #6
            Yep, completely normal on that model year. I was riding at Deepwater when the problem was just coming around and the breaks looked just like that. The new axle and sprocket design you'll get will take anything you can throw at it.
            Everybody dies, but not everybody lives.

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            • #7
              I would go ahead and change the other side to the double sprocket. That way you can check the axle while it is out of the machine for any signs of fatigue.

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              • #8
                Originally posted by liflod View Post
                I would go ahead and change the other side to the double sprocket. That way you can check the axle while it is out of the machine for any signs of fatigue.
                Good advise,If that was hardened,it should have sheared near clean,not twisted like rope.I think there was something wrong with the metal myself.I'd be checking all the axles

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                • #9
                  i have a 1996 max iv should i check my axels for this problem or are mine different that the 99
                  1996 MAX IV ,KUBOTA DIESEL
                  MAX II 30HP Bandolero

                  Comment


                  • #10
                    HMMMMMM

                    That sure looks like a spiral fracture to me, probably a factory flaw, I'm an ARGO man and have been running them since 1976, have dealt with this issue more than once. I would pull the other ones just to have a look, if you had access to someone who does Magnafluxing you could have them checked for stress fractures. Remember we run our machines in all weather (at least I do in FtMcMurray Alberta Canada) Plus 25 celcius down to minus 40 celcius and it is only rolled steel, A good Jolt anywhere along the line can facilitate such a break down the road..GOOD LUCK.

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