TM 5-3805-261-10
THEORY OF OPERATION - CONTINUED
0003 00
HYDRAULIC SYSTEM
0003 00
1.
General. The hydraulic variable-displacement pump assembly is mounted under the cab and is shaft driven by the
engine. The variable-displacement rear section draws oil from the hydraulic tank and provides oil flow for steering,
articulation, wheel lean, and earth moving components. The constant-displacement front section circulates oil to the res-
ervoir (tank) through the cooler, the filter, and the strainer.
2.
Steering System.
a.
Steering Cylinders: There are two steering cylinders mounted at the front axle that turn the front wheels. The cyl-
inders are powered by the hydraulic system and controlled by the steering wheel pump and steering wheel.
b.
Wheel Lean Cylinder: The wheel lean cylinder is mounted on the right side of the front axle. It is powered by
hydraulic system and controlled by a lever in the operator compartment. The function of the wheel lean cylinder is
to set the front wheels at an angle. This counteracts blade pressure exerted sideways against the front wheels when
grading or moving heavy material. The wheel lean cylinder also sets front wheel angle to prevent the front of the
machine from slipping sideways and downward when the machine is moving across a slope.
3.
Earth Moving Equipment. The scarifier height, blade height, rotation, tilt, side-shift, center-shift, and angle are all
hydraulic powered and controlled by levers in the operator compartment.
END OF WORK PACKAGE
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