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The dip indeed is meant to flush out any particles. I only grease the rollers on the outside of the gear system though, with standard lithium grease.
Have not had to do anything about the standard wheel hub bearings. And should it come to that, as older wheels might do, you'd need to take the gear bit apart.
Sheldon Brown has the service manual online: https://www.sheldonbrown.com/nexus8/index.htm
Thanks! Do you use the specific shimano grease, or just normal (lithium?) bike bearing grease?
So you grease the bearings and gears first and then ATF dip it? I though part of the point of the oil/ATF bath was to flush away any metal particles created by gear wear. Doesn't having the grease on the moving parts trap them in place?