Operating instructions
Shifting gears 91
All Wheel Drive models
AWD (All Wheel Drive) is an optional hydrostatic drive system
used to increase tractive effort and steering control at the front
wheels during slippery conditions. Two electronically controlled,
variable-displacement hydraulic pumps power the system in a
closed loop circuit. Each pump supplies one front wheel motor.
The wheel motors are a 2-speed, high torque, radial piston, cam
lobe type. Each wheel motor has a separate speed sensor. AWD
responds in forward gears 1 to 7 and all reverse gears.
All Wheel Drive applications
Side loading
You can counteract the side loads encountered when working
across a slope or when grading heavy material by using All Wheel
Drive. Driving the front wheels against the side loads maintains di-
rectional control.
Traction and steering control
When traction is poor and the rear wheels of the grader are slip-
ping, use All Wheel Drive to transfer power to the front wheels. By
counteracting rear wheel slip, All Wheel Drive allows the grader to
carry a greater load on the blade, reduces rear tire wear and re-
duces shock loads on the primary drivetrain. All Wheel Drive can
also give you better steering control on low traction surfaces by
supplying full power to both front wheels during turns.
System operation
The system is activated by depressing the rocker switch on the
AWD control panel (2). All Wheel Drive capability is available in
gears 1 to 7 forward, and all reverse gears. Refer to Instrument
panels, All Wheel Drive control panel page 52.
n If AWD is switched on when the grader is moving, the grader
must be slowed below 4th gear for the system to engage. The
indicator lamp will flash until the system engages.
n When upshifting, the system automatically switches to tan-
dem drive only in 8th gear, and back to AWD in 7th gear when
downshifted.
IMPORTANT! Do not allow the grader to coast (freewheel)
downhill in NEUTRAL with the AWD System engaged. Dam-
age to components may result.
System deactivation
The AWD system automatically deactivates under the following
conditions:
1 AWD rocker switch is placed in the OFF position.
2 Transmission shifter is placed in neutral.
3 Transmission shifter is placed in eighth gear forward.
4 Clutch or brake pedal are depressed.
5 Hydraulic oil temperature in the reservoir is above normal oper-
ating range.
6 Oil level in the hydraulic tank is too low.
7 Charge pressure is too low.
1 System activation lamp
2 All Wheel Drive on/off switch
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