Yamaha YFM45FAR Service Manual page 17

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
transmitted 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
velocity 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).
Therefore, the maximum traveling speed is limited to 35 km/h (22 mph).
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