My guess it is caused by slop in the 'C' channel where the main axle pivot pins the axle to it.
Back and forth movement, if not tight when hitting bumps or obstacles would, I think, could cause that damage if not more, over time.
And it would be magnified of course with a loader involved.
Luckily, I did not encounter this issue when I restored my 149/DanCo unit last winter.
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