1980 Ski-Doo Shop Manual, Page 272Get this manual
SECTION 05 SUB-SECTION 07 (CHAINCASE)
REMOVAL
- suspensioninjection oil reservoir (if applicable)battery and battery holder (if applicable)
chaincase cover and drain the oil
Pry out drive axle oil seal from chaincaseRemove cotter
pins, nuts, washers, sprockets and chainRemove bolts and nuts securing chaincase to frame
INSPECTION