OI just did a bunch of google research on the drive, then went and looked at an example I have in my garage. (it is not from a Farmall, but uses the same design. The spiral sleeve is definitely attached to the armature shaft. The pinion is attached to the spring, but the spring only retracts the drive, the end of the grooves limit the travel of the pinion into the ring gear. If the spiral splines on the tube were free to rotate with the pinion, there would be no reason to assume the pinion would move out to engage at all. I think yours is broken where the sleeve attaches to the drive collar closest to the armature, where the bolt that is long enough to drive the collar is located. It could have broken off at that point due to the forces that were strong enough to snap the shaft at the bolt hole. It is a great discussion. Jim
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Today's Featured Article - Memories of a Farmall C - by Monty Bradley. When I was a child, my grandparents lived on a farm owned by a Mr. Walters. The crops raised were cotton and soybeans, with about forty head of mixed breed cattle. Mr. Walters owned two tractors then. A Farmall 300 on gasoline and a Farmall C, that had once belonged to his father-in-law, and had been converted from gasoline to LP Gas. Many times, as a small boy, I would cross the fence behind the house my grandparents lived in and walk down the turn row to where granddaddy would be cultivati
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