I took the box out of my 1641 apart last week when I discovered that the seal retainer had come out of place. I've cleaned up all the parts and ordered a new pin and seal retainer. The plastic cage for the upper bearing had broken up and I found several pieces of it in the grease. I plan to put it back together without the cage. The pin does wear in two places if it's never been adjusted. I don't have mine back together yet so I won't give any advise on that.
Cannon
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