2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 400Get this manual
2WD4WD SELECTING SYSTEM
8.Gear motor
C0NTINUITY
Disconnect the gear motor couplerRemove the gear motor from the differential gear caseRefer to "FRONT CONSTANT VELOCITY JOINTS AND DIFFERENTIAL GEAR" in CHAPTER 7Connect 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 correctly