2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 153Get this manual
FINAL DRIVE FRONT GEARCASE CENTRALIZED HILLIARD
All Wheel Drive Operation
Front Gearcase Engagement: The AWD switch may be turned on or off while the vehicle is movingInitially, the vehicle's electronic system will not enable the AWD until the engine RPM is below 3100Once enabled, AWD will remain engaged until the rear wheels regain traction and the propshaft speed matches the front axle speedEngage the AWD switch before getting into conditions where the front wheel drive may be neededIf the rear wheels are spinningrelease the throttle before switching to AWD4x4 Engagement: When the AWD switch is turned on, 12 VDC current charges the hub coil and creates magnetic fieldThis magnetic field attracts an armature plate keyed to roller cage that contains rollersThe difference in RPM between the input shaft (propshaft) and front axles, forces the rollers into the external cam of the Hilliard clutch assemblyThe rollers are forced inward to engage themselves to the output hubs that link directly to both front axles, resulting in True All Wheel DriveRoller Cage Rollers