4x4 broke on my bx: Kubota Review  -- Kubota Tractors Discussion Forum and Review 4x4 broke on my bx: Kubota Review -- Kubota Tractors Discussion Forum

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 01-02-2005, 15:36 Post: 103308
cthonestguy

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 4x4 broke on my bx

I was giving my BX2200 a good workout today and all of a sudden I was stuck. I realized I didn't have 4WD. I got under the machine to find the front drive shaft came apart at the center link u-joint. Looks like there was a shear pin in there and it came apart. Sort of odd they would have a shear pin on a splined shaft??? Long and short is I can't figure how the pin broke and it came apart. Did this happen to anyone else ever out there? Seems like it's ok. part of the shear pin was left and I tapped it back in. I have every size but the one I need- murphy's law.....Jim






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 01-02-2005, 21:21 Post: 103331
Art White



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 4x4 broke on my bx

I can only think of one in the past altough the customer is a mechanic he couldn't figure out why. He has since upgraded this past spring to a BX23 for the hoe from the 2200. This fellow definitely gets all he can from a tractor as far as use as he takes care of 8 acres with it. Property has woods of about 3 acres and a stream thru a gourge that has a lawn and top side for a house.






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 01-02-2005, 22:27 Post: 103334
cthonestguy

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 4x4 broke on my bx

I have to admit I was working it real hard and pulling up some big rocks. actually had to push them because it wouldn't lift them. No unusual noise or anything just stopped working and I looked under it and saw the shaft hangine there. It took all of 5 minutes to fix. But I need to get a new pin. Not sue why there would be a shear pin on a splined shaft? I'm tempted to replace it with a bolt of a soft grade.






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 01-03-2005, 07:37 Post: 103339
Art White



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 4x4 broke on my bx

Stick with the pin just to ensure that if it is a shear pin that it will shear instead of breaking the shaft. Talking with the parts people we have one fellow who has broken it several times. He has admitted that he often doesn't put the tractor into four wheel drive until he is in trouble or stuck and this is where it has happened. I don't know what the wisdom of kubota is with these parts but it does seem strange that a splined shaft would have an actual shear pin for protection.






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 01-03-2005, 08:35 Post: 103342
denwood



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 4x4 broke on my bx

I think that the shear pin speaks to the possibility there is a very weak link somewhere else in these tractors and instead of re engineering it properly, they cheaply added a weak shear pin to protect the real weak spot. Warranty shear pins are cheap, not much else is.






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 01-03-2005, 09:56 Post: 103349
cthonestguy

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 4x4 broke on my bx

This sounds like the story. The only force would be front to back force where the shaft is shoved har into the knuckle. You would think something simple like having a deeper female side on the knuckle and a longer splined shaft to slide freely would solve the problem. This is my only complaint with 300 hours on this machine pretty much other than minor electrical connections that got dirty. I'd much rather replace a pin than a shaft any day. I was working it too hard I must admit and it was in 4x4 the whole time.






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 01-03-2005, 15:10 Post: 103374
denwood



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 4x4 broke on my bx

It sound like you are talking about a sleeve that couples both shafts and the pin just keeps it in place. In that case, twisting force has no effect on the pin? If that were the case, I would re-engineer that shaft to never fail in that manner.






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 01-03-2005, 16:16 Post: 103376
cthonestguy

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 4x4 broke on my bx

That's exactly what it does. The only way it would break from twisting would be if the splines stripped. It has to be there for a reason but I just don't know what reason. it is a hole on one side of the knuckle joint that holds it fiexe and the other side floats on the splines.

I was pounding on some huge rocks. It may be there for when you put too much force on the front axle, rather than shove the shaft into your transaxle it breaks the pin?

282 hours and it's the 1st time it broke. Just good luck finding the right size pin. It must be metric.






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 01-03-2005, 16:23 Post: 103377
cthonestguy

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 4x4 broke on my bx

here is the link to the parts list where it broke. look towards the middle of the shaft by bolt #250. pin 180 or 185 broke. Not sure why there are 2 pin part numbers here but this is the pin that broke and here is the design. Seems to me if the front axle bump stops are in place for the axle pivot there is no possible way of over extention of this shaft or the posibility of it being pushed too far in? kind of in the clouds why it's a shear pin and not just a stronger mount? check it out...Jim






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 01-03-2005, 16:25 Post: 103379
cthonestguy

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 4x4 broke on my bx

sorry, the link posted to the whole parts sheet. look at page 62...Jim






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