2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 277Get this manual

2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 277

FINAL DRIVE ADC Operation Engaging Front Gearcase: Active Descent Control (ADC) is controlled by the ECU and will not enable
coilThe coil's magnetic field attracts splined armature plate (2) on the pinion (input) shaft (4)The energized splined armature
plate attracts the unsplined eccentric cam (3), which begins to turn with the input shaftThe eccentric cam pushes on the
hydraulic pistonpump assembly (5)The pressure created by the pump assembly forces hydraulic fluid through passages to the
piston assemblies (6) located in each case halfHydraulic pressure forces the piston assemblies inward to compress the splined
clutch packs (7) forming dynamic coupling to each front drive axle, resulting in true all-wheel EBS operation upon decelerationDisengagement:
Current to the ADC coil is turned off by the ECU anytime the following conditions are met: Throttle Position Sensor (TPS)
moves off idle position The AWD switch is switched to 4x4' or 2x4' Vehicle speed is above 15 Mph (24Kph) Hydraulic pressure