THEORY OF OPERATION - CONTINUED
The steering system is based on a 60/40 articulation. 40% of the roller is located in front of the articulation pivot point.
60% is located in the rear. The front drum is attached to the yoke assembly, while the rear drum is attached to the frame
assembly. Two hydraulic steering cylinders provide the motive force to steer the roller by articulating (shifting the yoke
and frame of) the roller to change the path of travel. The steering wheel controls the direction of travel by actuating a
hydraulic steering control valve which directs pressurized hydraulic oil to the hydraulic steering cylinders.
The steering system's hydraulic steering pump has two functions. The primary purpose is providing pressurized hydrau-
lic oil used in steering the roller. Secondarily, the steering system hydraulic pump is used to charge the propel system.