2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 214Get this manual
FINAL DRIVE AWD Operation
The AWD switch may be turned on or off while the vehicle is moving, however, AWD will not enable until the engine RPM drops below 3100Once the AWD is enabled, it remains enabled until the switch is turned offEngage the AWD switch before getting into conditions where the front wheel drive may be neededIf the rear wheels are spinning, release the throttle before switching to AWDRing Gear Roll Cage
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 restWith the AWD switch off, the vehicle drives through the rear wheels only (2 wheel drive)When the AWD is enabled, the front drive acts as an on-demand AWD systemThis means, the front drive will engage once the rear wheels have lost traction, and will remain engaged until the torque requirement goes away (i.erear wheels regain traction)Magnetic Coil Output Hubs Roll Cage