Broken Drive Shaft - Design Flaw Warning!!

[RickB]

The old shaft would wobble as it was loose on the trans shaft and the pump shaft. The new design clamps tight on both ends and does not slide or wobble.

In theory. I don't expect those worn splines to grip any kind of clamped yoke squarely, or last much longer than it takes for the check to clear.

 

[Klorinth]

In theory. I don't expect those worn splines to grip any kind of clamped yoke squarely, or last much longer than it takes for the check to clear.

Rick, you may be right. It may not last as long as the original. That is fine with me. Spending $250 and an hour of my time is much better then having the tractor hauled to a repair shop, split in half, and the input shaft replaced in addition to the front shaft.

I just wish I had heard about this issue sooner. I would taken the shaft off and checked it. There is discussion about this in the TYM forum but I rarely ever looked there. Hopefully Montana owners will see this and check theirs before the damage is done.

 

[Coyote machine]

Frame twist, that seems like a real problem in itself, not to mention the poorly designed shaft and it's method of connecting the engine to HST. It there some sort of center bearing, with housing to give additional support and alignment aside from the 2 u-joints?
Are there any current ideas on how to reduce frame twist?

 

[Bud Soda]

Frame twist, that seems like a real problem in itself, not to mention the poorly designed shaft and it's method of connecting the engine to HST. It there some sort of center bearing, with housing to give additional support and alignment aside from the 2 u-joints?
Are there any current ideas on how to reduce frame twist?

I repaired my frame twist problem. There is a post about it in the TYM forum( http://www.tractorbynet.com/forums/tym-owning-operating/299636-273-broken-frame.html). I got 700 hours out of the old shaft. The new shaft will last much longer. It is made like one on a chevy truck front x-fer case to front axle. It will outlast the rest of the tractor. Now the front driveshaft will give problems I am sure because it is built like the HST one.

 

[SPYDERLK]

Rick, you may be right. It may not last as long as the original. That is fine with me. Spending $250 and an hour of my time is much better then having the tractor hauled to a repair shop, split in half, and the input shaft replaced in addition to the front shaft.

I just wish I had heard about this issue sooner. I would taken the shaft off and checked it. There is discussion about this in the TYM forum but I rarely ever looked there. Hopefully Montana owners will see this and check theirs before the damage is done.

IF it will clamp tight on the worn part of the spline Id stay on that part so that the splines mate evenly. ... But I would use # 638 Loctite in that socket to worn spline fit to fill voids as you clamp, and stabilize. Clamp it tight. With no movement it should last "forever".
,,,larry