7.9
FINAL DRIVE
FRONT GEARCASE -
CENTRALIZED HILLIARD
Operation Overview
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.
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 rollers and roller cam. The difference
in rotational rpm between the input shaft and front axles 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.
Disengagement: As the front and rear wheels gain traction,
their rotational rpms are 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. Al-
ways switch to AWD while the rear wheels have traction
or are at rest.
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.
Ring Gear
Armature Plate
Roller Cage & Bearings
To Next Page
Loading...
Need help?
General
