Yamaha BIG BEAR 400 Owner's Manual page 111

To change the differential gear oil
1. Place the ATV on a level surface.
2. Place an oil pan under the differential gear
case to collect the used oil.
3. Remove the differential gear oil filler bolt and
the differential gear oil drain bolt to drain the
oil from the differential gear case.
1. Differential gear oil drain bolt
4. Install the drain bolt, and then tighten it to the
specified torque.
Tightening torque:
Differential gear oil drain bolt:
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
5. Add the recommended differential gear oil to
the brim of the filler hole as shown.
1. Differential gear oil
2. Differential gear oil filler bolt
3. Correct oil level
Recommended differential gear oil:
See page 10-1.
ECB00410
CAUTION:
Be sure no foreign material enters the differen-
tial gear case.
6. Install the oil filler bolt, and then tighten it to the
specified torque.
8-19
8