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I have a JD 6310 with power quad transmission., After starting the tractor and idling, the cross or flange on the UJ Driveshaft broke taking out the transmission filter housing. After disassembly, the front of the driveshaft was unbolted and what I believe is part of the flywheel was sheared off. It was a clean break, no signs of former damage. It's the the part the bearing housing slides on over. I'm writing this while looking at the parts diagrams. I don't believe it's the crank shaft that broke, I think this is part of the flywheel, I can't tell from the diagram. I believe my tractor was built with the updated UJ driveshaft, not sure about the flywheel. The parts diagram shows a sub for both. Without the driveshaft attached, I started the tractor tonight and it ran fine, sounds like the engine is ok. What would make this happen? Are there any common problems relating to this with this model?
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