I would GUESS it"s working loose, even with Loctite, because the gear and/or splines are worn and there"s movement between the shaft and gear, even when the retaining bolt is tight.
That being said, did you use a Grade 8 bolt, and high-strength Loctite, with primer?
NOT quite sure how it all fits together, but could the locking wedge/gear/shaft combination be worn in such a way that parts bottom out against each other before the wedge is pulled into place and collapses tightly?
A quick look at the parts breakdowns shows some serial number breaks on the parts, as well.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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