Yamaha GRIZZLY 660 YFM66FAV Owner's Manual page 330

1. Differential gear oil drain bolt
1. Boulon de vidange de l'huile de différentiel
1. Perno de drenaje de aceite de engranajes del diferencial
Replacing the differential gear oil
1. Place the ATV on a level surface.
2. Place a container under the differential gear
case to collect the used oil.
3. Remove the differential gear oil filler bolt and
differential gear oil drain bolt to drain the oil.
4. Install the differential gear oil drain bolt and
tighten it to the specified torque.
Tightening torque:
Differential gear oil drain bolt:
10 Nm (1.0 m·kgf)
8-59