1980 Ski-Doo Shop Manual, Page 248Get this manual
SECTION 05 SUB-SECTION 04 (DRIVEN PULLEY)
REMOVAL
Remove the following items: -
belt guard and drive belt
injection oil reservoir air silencer battery (electric start models only) chaincase cover upper chaincase sprocket
Open the bearing cage, lift up and pullout the countershaft assemblyRemove the driven pulley assembly from the countershaftWARNING: It may necessary to loosen the brake adjustment in o-der to easily lift the countershaftAlways check that the brake disc is correctly installed between the brake pads and that the brake is well adjusted, Check brake light operation