Im helping a friend do some maint on his mid 80ies 610 with the 4 cyl gas Wisc engine. We've done the clutches and fluids and noticed the alternator belt is shot. Pulled the tin,loosened the alt and then realized the belt isnt coming off without pulling part of the right side drive as the alt drive pulley is on the output shaft for the right side sprockets.. I do see a collar with a set screw on the inboard of the lower drive pulley, but still dont see whats whats as far as tear down. We have the OE parts manual which is pretty vauge pics wise. Any direction would be greatly appreciated on getting the belt done. Thank You!