Yamaha BIG BEAR 400 Owner's Manual page 119

Replacing the final gear oil
1. Remove the final gear case cover by re-
moving the bolts.
1. Final gear case cover 2. Bolt (× 2)
2. Place the ATV on a level surface.
3. Place a container under the final gear
case to collect the used oil.
4. Remove the oil filler bolt and the drain
bolt to drain the oil.
1. Final gear oil drain bolt
5. Install the drain bolt, and then tighten it to
the specified torque.
Tightening torque:
Final gear oil drain bolt:
23 Nm (2.3 m·kgf, 17 ft·lbf)
8-12