Hydrostatic Drive
This grader is powered by a diesel engine with dual-
range, hydrostatic transmission system that propels
the machine forward or reverse at varying speeds with
dynamic braking action. Components of the hydrostatic
drive system include a hydrostatic traction pump,
variable-speed hydraulic motor, two-speed tandem axle,
rear axle carrier assembly and gear drive. A two-speed
transfer case mounted between the drive motor and
rear axle carrier provides high and low gear selection.
The rear axle carrier assembly converts input rotation to
axle shaft output rotation to drive the wheels.
The function and steering pump is mounted on the rear
of the traction pump and driven by the traction pump
output shaft. This provides hydraulic pressure and ow
to operate all the hydraulic cylinders that controls the
steering cylinder and other grader functions.
Electrical System
The electrical system is powered by two 12-volt
batteries, wired in parallel and mounted in a battery
compartment on the frame. Each battery produces
800 cold cranking amperes (CCA) for a total of 1600
CCA. An engine-mounted alternator with 135 amperes
of charging capacity keeps the batteries charged during
normal operation.
Moldboard
The moldboard is a major component of the 685D Motor
Grader. This adjustable, hydraulically-controlled blade
is mounted between the front and rear wheels that can
cut, move and spread materials to grade requirements.
The moldboard blade is mounted under the turntable
circle that can be hydraulically rotated right and left.
The moldboard height is controlled by two hydraulic
cylinders mounted to ball joints at a turntable.
The blade can be aggressively angled perpendicular
to the line of travel or parallel to the direction of travel.
The blade’s curved shape allows material to roll more
freely along the blade. The moldboard can be moved
forward and also shifts three (3) feet (.9 meters) left or
right. It can tilt side-to-side and front-to-rear, rotate
64 degrees, and features oat controls that can cut 1.2
feet (.355 meter) below grade. This versatility allows
extreme moldboard positioning to meet a variety of road
construction and maintenance needs, including easier
bank sloping and ditch cutting.
Components
LeeBoy 685D Motor Grader3-4
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