NOTE: Use slower ground speed when operating
with any attachment on the front or rear of
the grader.
After selecting high or low gear, use the red-tipped
throttle lever beside the operator seat to speed up and
slow down (increase or decrease RPMs). (Figure 4-27)
Throttle
Lever
Figure 4-27. Throttle Lever
Inexperienced grader operators
should always operate at slower speeds until gaining
the skills needed for faster operation. Extra care
must be taken by all operators in rough terrain,
bad weather and other hazardous situations to
prevent injury or even death. Before starting any
work, make sure you understand the machine, its
maneuverability, and its limitations.
Directional Control
The 685D Motor Grader is equipped with a forward/
reverse variable-speed, hydrostatic transmission and
variable hydraulic motor that are controlled separately.
The FNR pedal controls the hydraulic ow and direction
of ow through the hydrostatic transmission. (Figure
4-28)
The FNR pedal is very sensitive.
Ensure nobody is near the grader before engaging
the FNR pedal and use only a little pressure on the
pedal when moving either direction to prevent the
grader from lunging.
Press for
Reverse
GENTLY
Press for
Forward
Foot Brake
FNR
Figure 4-28. FNR Pedal
To move the grader forward or in reverse:
1. Ensure the FNR pedal is in the neutral position, the
park brake is engaged, and follow the instructions
for Starting the Engine on Page 4-4.
2. Select High or Low gear.
NOTE: You MUST STOP the machine on level
ground and engage the park brake in
order to shift between High and Low speed
modes. (Figure 4-28)
3. Release the park brake by moving the switch
DOWN. (Figure 4-28)
• To drive forward, GENTLY push the front rail of
the FNR pedal forward with your foot.
• To drive in reverse, GENTLY push the back rail of
the FNR pedal backward with your foot.
• To stop, remove foot from pedal and allow it to
return to the center (neutral) position.
Braking
Typically, operators use the FNR foot pedal for slowing
down by simply releasing it into neutral. This method is
recommended.
To quickly bring the grader to a complete stop, gently
step on the foot brake pedal. (Figure 4-28) Be sure
your seat belt is securely fastened as using the foot
brake will stop the grader very quickly and can abruptly
throw the operator in the direction of travel.
In an emergency, use the E-Stop (Emergency Stop)
button on top of the control panel. (Figure 4-26)
NOTE: If you use the E-Stop method, always check
brake function afterward as described
on Page 4-4. It is recommended that you
check brake function daily, but especially
important after E-Stop use.
4
Operation
LeeBoy 685D Motor Grader 4-19
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