I have a 2188 and had the same problem, living in Denmark often means damp conditions and the darn rockbeater would slug and rumble and sometimes straw would get around the axel up against the bearing and smoke the bearing in no time. Rock beater was OEM stock. Rebuild the darn thing, still same problem! Then I called my Case combine mechanic and he suggested to remove the rockbeater and as have few rocks I did so (used combine, came with rockbeater)
It was quite an easy job and all it tok was the new shorter belt and a difrent chain shielding house (shorter). And I never looked back, combine runs great now. So all I will say in this post is, YES it is possible to remove rockbeater.
Thanks and have a great harvest season to You and everyone ``overthere``