I have a Nexus 7-speed that I picked up second hand; I have no idea of its history. However, when I ride it, it sounds like a grinder in a couple of gears, and has more play than my other Nexus hub. This leads me to suspect that it needs its grease reapplied.
On his site, Sheldon brown says:
The Nexus hubs are packed with a very special grease. They are quite well sealed, and should only require service at very rare intervals. The great majority of mechanical problems that I've encountered or heard of have been the result of "preventive maintenance" including re-lubrication with incorrect grease.
The hub must be disassembled into its major components, solvent cleaned, dried and re-greased with Nexus hub grease (not to be confused with the similar Nexus brake grease.
Dismantling the hub is not as difficult as you might think, because of its modular construction.
If you unscrew everything that is screwed onto the left end of the axle, the whole mechanism can be pulled out of the right side as a unit.
I have the Nexus grease, so my question is: is this task as straightforward as it sounds above? Am I contemplating fixing something that ain't broke?