Front Gearcase - Centralized Hilliard Adc; Operation - Polaris A12MH46AX Service Manual

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FRONT GEARCASE - CENTRALIZED HILLIARD ADC

Operation

Engaging front gearcase: The AWD switch may be
turned on or off while the vehicle is moving. AWD will not
enable until the engine rpm is below 3100 RPM. Once
enabled, the AWD remains engaged while the front
gearcase is moving and will not disengage until the rear
wheels regain traction.
Engage the AWD switch before getting into conditions
where the front wheel drive may be needed. If the rear
wheels are spinning, release the throttle before switching
to AWD.
CAUTION
Switching to AWD while the rear wheels are
spinning may cause severe drive shaft and
gearcase damage. Always switch to AWD while the
rear wheels have traction or are at rest.
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 drive when there is a loss of rear wheel traction.
Roll Cage
Output Hubs
Ring Gear
4x4 Engagement: When the AWD switch is activated, a
12 Vdc current charges the central coil, creating a
magnetic field. This magnetic field attracts an armature
plate keyed to a roller cage inside an external cam / ring
gear. The rpm difference between the input shaft and front
axles forces the rollers up the external cam. The rollers
engage, or "wedge" themselves between the external cam
/ ring gear and output hubs that link both front axles,
resulting in true all wheel drive.
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
Magnetic Coil
Armature Plate
© Copyright 2011 Polaris Sales Inc.
Ring Gear
CAUTION
If the rear wheels are spinning, release the throttle
before turning the AWD switch on. If AWD is
engaged while the wheels are spinning, severe
drive shaft and clutch damage could result.
Disengagement: As the front and rear wheels gain equal
traction, rotating very close to the same speed, the
transmission shaft "overdrives" the front gearcase input.
The rollers release outward, disengaging the AWD. The
vehicle is now back to rear wheel drive until the next loss
of rear wheel traction.
FINAL DRIVE
Roller Cage
Rollers
7
7.17

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