If you take the gear box off of the combine each "shaft assembly" is held in by set screws, I can't remember exactly how many 3 or 4 each. Each "shaft assembly" is one bevel gear shaft, 2 tapered roller bearings and 1 sleeve. The screws clamp down on the sleeve. Loosening these screws will allow you to slide the "shaft assembly" in reducing your back lash if that is in case the problem. The problem that we used to have is that on the end of each shaft is a spanner nut that is held in place with a little keeper, thing (lack of any other name to call it). The little keeper thing kept breaking allowing the spanner nut to back off allowing the bearings to become all lose and care free causing the shaft to get lazy, fall out of place and not drive the bubble up auger.
If it were my combine, I would pull the gear box, check the preload on the bearings to make sure they are tight, if you still have excessive slop in it try to move the shafts in. If that doesn't work hold on to your shoe laces. The bearings are not that expensive but the shafts are roughly $350 a piece around here.
Good luck and I will try to check back on this thread, I may have an old TR manual (maybe TR70 maybe 75 after that dealer moved and I jumped brands) around that I could scan and email to you.
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