2005 Polaris Sportsman 400/500 Service Manual, Page 196Get this manual
FINAL DRIVE
FRONT GEARCASE OPERATIONCENTRALIZED HILLIARD)
Engaging Front Gearcase: 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, the AWD remains while the front gearcase is moving, it will not disengage until the rear wheels regain tractionEngage 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 AWDCAUTION: Switching to AWD while the rear wheels are spinning may cause severe drive shaft and gearcase damageAlways switch to AWD while the rear wheels have traction or are at restNormal Operation: With the AWD switch off the vehicle drives only the rear wheels (2 wheel drive)When the AWD switch is activated it engages the Hilliard, locking both front axles into All Wheel DriveRoller Cage
in True All Wheel DriveCAUTION: If the rear wheels are spinning, release the throttle before turning the AWD switch onIf AWD is engaged while the wheels are spinning, severe drive shaft and clutch damage could resultRoller Cage and Roller's Rotate Inward and Grip the Output Hub for AWD Engagement Output Hub