2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 233Get this manual
MIDDLE GEAR 5.Remove: Bearing retainer Bearing
Removal steps: Attach the folded rag 1Secure the bearing housing edge in the viseAttach the bearing retainer wrench 2Bearing retainer wrench: PNYM-04128, 90890-04128
CAUTION:
The middle driven shaft bearing retainer has left-handed threadsTo loosen the retainer turn it clockwise Remove