PRINCIPLES OF OPERATION.
Steering Cylinders (Figure 1-51). Mounted at the front axle. Refer to paragraph 1-21 for location. The two
steering cylinders turn the front wheels. Powered by the hydraulic system. Controlled by the steering wheel pump and
Wheel Lean Cylinder. Mounted at the front axle. Refer to paragraph 1-21 for location and further
description. Powered by hydraulic system. Controlled by a lever in the cab. Sets front wheels at angle to counteract blade
pressure exerted sideways against the front wheels when grading or moving heavy material. Also, sets front wheel angle
to prevent the front of the vehicle from slipping sideways and downward when the vehicle is moving across a slope. Refer
to TM 5-3805-261-10 for further description of operation.
Circle Drive Motor Assembly and Lines (Figure 1-52). Mounted on drawbar over forward section of blade
circle ring gear. Hydraulically driven. A gear on the motor drives an internal gear on the blade circle. Controlled by a lever
in the cab. Refer to paragraph 1-31 for further descriptions.