Although i have not worked on a Nexus hub,
Shimano's tech sheet page has your info. The Nexus drivetrain is found on the fourth category on the left (Comfort), and the hubs are 2/3 of the way down the page under "SG Internally Geared Hubs". i was not sure which one was yours (there are quite a few!), so i figured it best to just pass on the site to you.
Hope this helps,
matt
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