2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 234Get this manual
FINAL DRIVE
AWD OPERATION OVERVIEW
With the Polaris All Wheel Drive System activated (AWD selected), the machine operates as wheel drive vehicle until the rear wheels lose tractionIf the rear wheels lose traction the front wheel rotational speed will decrease, causing the front drive axle speed to exceed front wheel speedRestricting the rotation of the drive clutch roller cage (2) (see Electric Hub Operation) will cause the rollers (3) to climb the ramps of the cam (5), and become squeezed between the ramps and the ring in the hubSee Ill1When the hub clutch assembly, wheel hub, and drive axle are engaged, the front wheels will drive and stay engaged until rear wheel traction is regainedWhen traction is regained, the front wheels will overdrive the hub clutch, pushing the clutch rollers (3) toward the lower part of the cam (5), disengaging the clutchThe rollers are held in place by the spring (4)See Ill2The tension of this spring is critical to AWD hub operationAlways use the correct spring (refer to appropriate parts manual) and use installation tool PN 2870888