"Robert Box" <
[email protected]> wrote in message
news:[email protected]...
> Can someone please direct me to some instructions for servicing a front Sturmey Archer dyno hub? I
> want to clean and grease the hub but do not want to damage the magnet by improperly disassembling
> it. Also , a picture of the "keeper" and its dimensions would be helpful also.
Right you are to hesitate before opening that hub.
A keeper is just a hunk of steel about the size of your armature that can be slid in right behind
the armature so there's always a hunk of metal inside the magnet. The official S.A. keeper and Jim
Adney's model are nice lathe-turned solid steel plugs. My stack of nine flat 16t cogs wired together
works fine ( I just happen to have a lot of cogs here).
Once opened, a toothbrush and your favorite cleaning solvent are fine for getting all the crud out.
I locktite the armature retaining nuts because overtightening them can dimple the hub shell. I don't
know the proper wrench size for those, but a Simplex 5mm socket is a good fit. When you reinstall
the hub dust caps, use a flat piece of steel to press or tap them flush with the hubshell. Those can
dent when smacked with a hammer.
--
Andrew Muzi
http://www.yellowjersey.org Open every day since 1 April 1971