2004-2005 660 Yamaha Rhino Factory Service Manual, Page 179Get this manual
BALANCER GEARS AND OIL PUMP GEARS
REMOVING THE BALANCER DRIVE GEAR AND BALANCER DRIVEN GEAR 1Straighten the lock washer tabs2Loosen: balancer driven gear nut NOTE: Place an aluminum plate between the teeth of the balancer drive gear and balancer driven gear 43 Remove: circlip plate balancer drive gear springs pins 4