1972 Ski-Doo Shop Manual, Page 54Get this manual
DRIVEN PULLEY
Bushing pusher
2Place assembly on wooden blocks and using pin punch and hammer, remove inner pin instal led in larger roll pin securing fixed pulley half to shaftRemove larger roll pin (fig1-9-15)
3Open sliding pulley half and insert both halves of special puller adapter between pulley halvesInstall C-elipsInstall puller and remove fixed pulley half (fig1-9-16)
DISASSEMBLY
(Alpine and Val mont models)