Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual page 94

GEN
FEATURES
INFO
4WD (Diff-Lock)
When the 4WD (Diff-Lock) mode is selected, the gear motor moves the drive clutch 2 further to the
right, which causes the ring gear 5 and the drive clutch 2 to engage. As a result, power is transmit-
ted directly from the ring gear 5 to the drive clutch 2, then to the left front constant velocity joint via
the adapter 1.
Meanwhile, because the ring gear 5 and the drive clutch 2 are engaged, the ring gear 5, the drive
clutch 2, and the right differential side gear 6 become locked coaxially. Thus, power is transmitted
as follows: differential pinion gear 4 → right differential pinion gear 6 → right front constant veloc-
ity joint.
When the ATV is in the 4WD (Diff-Lock) mode, the right and left wheels rotate constantly at the
same speed, which affects the maneuverability of the ATV (e.g., making it difficult to steer). There-
fore, the maximum traveling speed is limited to 35 km/h (22 mph).
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