1978 Ski-Doo Shop Manual, Page 66Get this manual
SECTION 02 SUB-SECTION 07 (CHAINCASE) (Bearing cup Oil retainer ring
REMOVAL
Remove pulley guard, drive belt and inspection coverRelease chain tensionRelease track tensionPry oil seal from chaincase (lower part) and drain oilDisconnect brake cablePry out lower access plugRemove cotter pin and spacerRemove nut on hinge rod at chaincase bracketFrom the inner side of frame, remove the nut securing chaincase lower bracketRemove bracketRemove nuts, washers and "U" clamp holding the chaincase to the frameRemove chaincase shimts) if applicableMove chaincase towards drive pulley to disengage hinge rodRemove drive axleUsing two (2) large screwdrivers inserted between chaincase and frame, pry complete assembly from vehicle
Convexe side toward oil sea!
Using an appropriate pusher, press oil seal into chaincase hubOil seal must sit flush with case hub edge
Place lower sprocket with longer flange toward
track side of chaincase(For proper sprocket and chain use, see Technical Data.l
INSTALLATION