The little "dogs" were worn down and the rotating upper agitator would not turn hardly at all ever.
Dale's Manifold S. • Plymouth, CA • March 12, 2014
Appliance: Model KENMORE 90 SERIES WASHER
My Repair & Advice
My agitator is designed to ratchet in one direction. So it sits still when the lower agitator is turning backwards for a moment then advances forward when the lower agitator is turning forwards (clockwise). The dogs are responsible for this ratcheting or one directional function of the upper agitator. Replacing the dogs was super simple. Mine had a nut which accepted a 1/2" driver square shank. So with a breaker bar and an extension I rotated the hold down nut while holding the lower agitator still with my other hand. I pulled the upper agitator off, took off a keeper ring made of plastic and replaced the dogs. I put a bit of anti-seize on the nut threads and re-assembled.