Yamaha BIG BEAR 400 Owner's Manual page 122

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.
1. Differential gear oil drain bolt
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, 7 ft·lbf)
5. Fill the differential gear case with the rec-
ommended oil.
Recommended oil:
SAE 80 API GL-4 Hypoid gear oil
Oil quantity:
0.35 L (0.31 Imp qt, 0.37 US qt)
CAUTION:
_
Be sure no foreign material enters the dif-
ferential gear case.
_
8-15