you don't have to pull the main armature.
remove control panel, leaving as many wires as possible connected to it (mark them)
remove exciter brushholders
remove nut, washer and wedge
remove exciter armature
pull the main brushes out of their holders
unbolt bracket from housing
with a 2 arm 18" puller remove the exciter bracket from the generator housing
remove the oil bath and starter
remove bottom bolts of generator housing to backing plate
put 2x4 under lip of oil pan to hold up engine
remove remaining bolts
knock housing with a hammer to help release hosing from lip on backing plate
use a chain wound around the feet of the housing and a chain hoist to slowly and carefully pull the generator housing off of the main armature
whalla!!!!!!!!