Polaris Sportsman 400 H.O. Owner's Manual page 41

Automatic Transmission Gear Selector
The transmission gear
selector is located on the
right side of the vehicle.
H: High Gear
N: Neutral
R: Reverse
Whenever the ATV is left
unattended, always place
the transmission in gear
and lock the parking
brake.
Shifting gears with the engine speed above idle or while the vehicle is moving
could cause transmission damage.
To change gears, stop the vehicle, and with the engine idling, move the lever
to the desired gear.
FEATURES AND CONTROLS
CAUTION
Gear
Selector
41