Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 21 Post(s)
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SA hubs are mostly identical in the basic concept, but the exact parts configuration varies. Odds are you're not missing any internal parts, though you'd have to search on-line for an exploded view of the AG to be sure.
I think that what SB refers to as the gear selector key is the cross shaped part which slides in the driver unit and carries the torque out to the rest of the hub. Often these get chipped, and don't engage properly either against the pins sticking up from the planet cage or the right side ring gear unit. However the single most common problem is pawl engagement, and you should start by making sure all the pawls are undamaged, well sprung, and move freely.
Look for a tutorial on your hub or SA hubs in general, or build it back up on the axle and see how things fit and work before putting it back into the shell.
An ounce of diagnosis is worth a pound of cure.
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