7.14
FINAL DRIVE
FRONT GEARCASE
CENTRALIZED HILLIARD
AWD Operation
Engaging Front Gearcase: The AWD switch may be turned on
or off while the vehicle is moving. Initially, the vehicle’s
electronic system will not enable the AWD until the engine RPM
is below 3100. Once enabled, the AWD remains while the front
gearcase is moving, it 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.
Normal 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 Drive.
4X4 Engagement: When the AWD switch is activated, a 12
VDC current charges the central coil which creates a magnetic
field. This magnetic field attracts an armature plate keyed to a
roller cage that contains 14 rollers and roller cam. The difference
in rpm by input shaft and front axles the forces the rollers up the
external cam. The rollers engage themselves to the output hubs
that link both front axles, resulting in True All Wheel Drive.
Roller Cage and Roller’s Rotate Inward and Grip the Output hub
for AWD Engagement
Disengagement: As the front and rear wheels gain traction,
rotating very close to the same speed, the front wheels
“overdrive” the output hubs and the rollers are forced outward,
disengaging the AWD. The vehicle is now back to rear wheel
drive until the next loss of traction.
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.
Coil
Armature
Plate
Roller Cage
Cover
Output Hub
Armature plate design may
differ from what is shown
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.
Output Hub
Rollers
Roller Cage
& Bearings
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