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Didn’t Sheldon Brown drill a hole in the hub body to be able to oil a nexus/ Alfine easily, old sturmey style.
How is the servicing? It looks to be a bit of a specialist tool pain.
Dave_Ray-
The only specialist tool you need is a large ring spanner to remove the plastic lock ring. Remove this, and the NDS lock nut and cone, the the whole internal body can be removed from the shell. A good clean of the internals and the inside of the shell, followed by a thorough lubing of the internals by an oil bath, is all it needs.
jj72
The best way is to service it regularly. This mostly involves removing the internals and bathing them in the specific Shimano oil bath. In London I’d say do this at least yearly.
The real issue is with the main bearing on the drive side. The bearing race is built into the ring body and isn’t replaceable, and it this which seems to wear out and gets pitted. It’ll still work but it’ll sound like shite.