2008 Yamaha Rhino YXR70FX Factory Service Manual, Page 327Get this manual
FRONT CONSTANT VELOCITY JOINTS, DIFFERENTIAL GEAR AND DRIVE SHAFT DRIV
CHECKING THE DIFFERENTIAL GEAR MOTOR 1Check: differential gear motor
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aConnect two size batteries to the gear motor terminals (as shown in illustration)NOTICE Be sure to check the motor operation after removing it from the differential gear case assembly Do not use 12 battery to operate the pinion gear Check that the pinion gear turns counterclockwise Check that the pinion gear turns clockwise