1972 cub lowboy 154

I recently purchased a cub not running. After getting it running I found that the clutch didn't work. This tractor uses a flywheel that doesn't have the clutch bolted to it. Instead there is a driveshaft that runs at engine speed that goes from the flywheel to the trans and the clutch is at the trans. There is a round plate that the clutch pressure plate bolts to that attaches to the input shaft of the trans. This short input shaft has a bolt hole through it, but no splines. The plate that attaches to this stub shaft has a matching hole through it. I found the bolt that attaches the plate to the input shaft sheared off. When I put the plate back on the input shaft it is not tight. There is no evidence of damage to either surface, so I am wondering if that plate is suposed to be loose with just a shear bolt holding it? Does anyone out there have any experience with this type of drive? Thanks Ted
 
The hub that the clutch bolts onto is split and the bolt(special) causes the hub to grip the shaft.

This is a common failure of the 154, wear will cause the shaft to fit too loose and shear the bolt. When the assembly is too worn and needs replaced, you can drill out he bolt hole to the next size and use an allen head bolt ..for one last fix
 

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