Yamaha GRIZZLY ULTRAMATIC YFM660FP Owner's Manual page 88

1. Differential gear lock switch "4WD"/"LOCK"
2. Lever
1. Contacteur de blocage du différentiel "4WD"/"LOCK"
2. Levier
1. Selector de bloqueo del diferencial "4WD"/"LOCK"
2. Palanca
Differential gear lock switch "4WD"/"LOCK"
To lock the differential gear in 4WD, make sure the
on-command four-wheel-drive switch is set to
"4WD", stop the ATV, move the lever to
position b, and then set the switch to "LOCK".
When the differential gear is locked, the differential
gear lock indicator light ("DIFF.LOCK") will come
on along with the indicator " " in the speedometer
unit display. To release the differential gear lock,
stop the ATV and set the switch to "4WD".
4-25
DIFF.
LOCK