Thanks for your replys. The motor was replaced today. 95 degrees F here today. Good time to fix the furance.
The Hydro flame II seens to now be called Hydro flame 8500 IV.
A schematic can be found at atwoodmobile.com Go to Heating systems, Manuals.
The furnace does not need to be removed. The repair can be made through the furnace door. This is not an easy DIY job.