2004-2005 660 Yamaha Rhino Factory Service Manual, Page 406Get this manual
2WD4WD SELECTING SYSTEM
8Gear motor Disconnect the gear motor coupler Remove the gear motor from the differential gear caseRefer to "FRONT CONSTANT VELOCITY JOINTS, DIFFERENTIAL GEAR AND DRIVE SHAFT" in chapter Connect two size batteries to the gear motor terminals (as shown illustrations) Check that the pinion gear turns counterclockwise Check that the pinion gear turns clockwise
Make sure that the drive gear (shift fork sliding gear) operates correctlyNOTE: When installing the differential gear case in the gear motor, refer to "FRONT CONSTANT VELOCITY JOINTS, DIFFERENTIAL GEAR AND DRIVE SHAFT" in chapter 7