parts for those hubs aren't too tough to find, troubleshooting & rebuild are in vol 1:
thecabe.com

Schwinn Service Manual Volume 1 & 2 | Bicycle Restoration Tips
http://thecabe.com/forum/threads/schwinn-service-manual-volume-1.81415/ http://thecabe.com/forum/threads/schwinn-service-manual-volume-2.81579/
