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| Illustration 1 | g01193383 |
(1) Steering control section (2) Metering pump | |
The steering control unit consists of steering control section (1) and metering pump (2). The steering control section contains the steering control spool, anticavitation check valves, and line relief and makeup valves. When the steering wheel is turned, the metering pump directs oil to the front steering cylinders.
The steering control spool is a sleeve type rotary valve with an open center. The steering control spool is spring returned. The metering pump is a gerotor type pump. The control spool governs the direction of the turn, while the metering pump controls the volume of oil flow.
The line relief valves limit the maximum pressure in the steering cylinders. These relief valves are set at the factory and are not adjustable. The anticavitation check valve and makeup valves allow for limited manual steering when the engine is dead.