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 - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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