Service Manual

Workman HDX/HDX−D Page 10 − 3 Front Wheel Drive (4WD)
General Information
The “Automatic on Demand” four wheel drive feature on
4WD Workman vehicles does not require operator ac-
tivation. The front differential on 4WD Workman ve-
hicles is an electro−mechanically activated
bi−directional overrunning clutch system. The front dif-
ferential is engaged whenever the ignition switch is in
the ON position and the clutch is engaged.
No power is delivered to the front wheels until the rear
wheels begin to lose traction. When the rear wheels
loose traction, the dual bi−directional clutches in the
front differential sense the rear wheels slipping and en-
gage the front wheel drive instantaneously to deliver
power to the front wheels. The four wheel drive system
continues to deliver power to the front wheels until the
rear wheels have enough traction to move the vehicle
without slipping. Once this occurs, the system stops de-
livering power to the front wheels and the handling char-
acteristics become similar to that of a two wheel drive
vehicle. The four wheel drive system functions in both
forward and reverse. When the front wheels are turned,
the rear wheels will slip slightly more before power is de-
livered to the front wheels.
When the clutch is disengaged (clutch pedal pushed in),
the vehicle differential relay is energized which removes
electrical current to the front differential to disengage the
differential (no power delivered to front wheels).
Operator’s Manual
The vehicle Operator’s Manual provides information re-
garding the operation, general maintenance and main-
tenance intervals for your Workman vehicle. Refer to the
Operator’s Manual for additional information when ser-
vicing the vehicle.
Front Wheel
Drive (4WD)