The axle pin was replaced with a new one. I also did a system improvement by putting a zerk fitting in the axle. In taking the tractor apart it was discovered that the original pin was frozen in the bore. The tractor appeared to pivot correctly but it did so due to the roll pin being broken. It took an acetylene torch getting the entire axle assembly glowing red to get the original axle pin out. I replaced it with one designed for the 70/100's off from ebay. Hopefully now the tractor will now pivot the way it was designed to and won't seize up from rust again.
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