2004 Ski-Doo REV Series Factory Service Manual, Page 264Get this manual
Section 06 TRANSMISSION Subsection 06 (CHAINCASE)
REMOVAL AND DISASSEMBLY
To remove chaincase proceed as followsRemove battery and battery rack (if so equipped) to gain access, refer to BATTERY sectionRemove hair pin no8Release drive chain tension by unscrewing tensioner adjustment screwDrain oil by removing drain plug no24
Pull chaincase from drive axle and countershaftUsing large prybars inserted between chaincase housing no7 and frame, pry complete assembly from vehicle
3,4,5,6,13,16,17, Cotter Pin, Nut, Sprocket, Shim and Drive Chain
Apply parking brakeRemove cotter pin no3 and nut no4 retaining upper sprocket no5 and screw no15 retaining lower sprocket no16Pull sprockets and drive chain simultaneouslyRemove shims no6 and no17NOTE: Should countershaft removal be required, refer to BRAKE then look for COUNTERSHAFT REMOVALRelease parking brakeRemove nuts no14Unfold locking tab no23 then remove caliper retaining screws no22Release track tension, use drive axle holder no20 (PN 529 007 200)