It was pretty common to work on our old discs, so you get used to it - we never replaced bearings unless they were really out or very rough...
At the most, you could move the new(est) bearing to the hardest to get to location and reuse the used bearing on the outside where its easy to get to in case it later goes out.
The biggest tip I learned - was be SURE not to crush the bearing hangers inward by tightening up the hangers on the main beam and THEN tightening the gang bolt!!
In other words, leave the bearing hangers loose on the main beam - then tighten the main gang bolt holding the discs as tight as you can get it (I made a special 8 feet long box end wrench for really torquing down my big 45 foot Krause disc plow gangs).
After the discs are "singing" tight - then tap the hangers back and forth a little on the beam to "center them" in their natural position hanging and then tighten them on the frame. That takes any sideways stress off the bearings as much as possible.
I've seen a disc thrash the bearings in one round before where the guys didn't do that...
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