Join Date: Apr 2005
Bikes: Kinesisbikes UK Racelight Tk
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Originally Posted by hybridbkrdr
Would you try to re-grease a dynamo hub yourself or is that something a shop should do? Or, would you try avoiding re-greasing them at all?
I read a message here somewhere saying someone had worked on a dynamo hub and ruined it. But I don't know whether he was just re-greasing or doing something else.
Assuming a Shimano generator hub, then it can be done, but shouldn't be attempted unless there is a very good reason.
The problem is the "current wire" running from the inside rotor, out through the slotted axle ending in the connector. Because of this it is vital that the connector doesn't move when unscrewing the locknuts/cones. When taking the hub apart, the connector should remain stationary to the axle the whole time (hold it down with a finger while using the cone spanners). Besides that it is just a standard cup-and-cone hub. Another problem is that the "current wire" is a thick copper wire. It only takes that many bends before snapping apart. It can also get snagged when screwing the cones on again.
One side of the hub can be serviced without problems, but get a feel for how the hub feels because the magnets makes cone adjustment more difficult.