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| Illustration 1 | g02442778 |
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(1) Steering pump
(2) Steering motor (3) Hydraulic tank (4) Charge filter for the implement and steering system (5) Charge pump for the implement and steering system | |
The steering hydraulic system transfers power to the steering differential in order to steer the machine to the left or to the right.
The steering closed loop is made up of steering pump (1) and steering motor (2). Steering pump (1) creates flow in one side of the steering loop. The flow causes steering motor (2) to turn. Oil then flows out of the steering motor and returns to the steering pump. As a result, this oil remains trapped in the closed loop circuit.
Steering pump (1) can produce flow in either direction. The amount of flow and the direction of flow determine the rotation of steering motor (2).
Steering motor (2) converts the oil flow from the steering pump into rotary motion that turns the steering differential. The speed and direction of the motor controls the rate of the turn and the direction of the turn by the machine.
Some of the oil is lost in the steering closed loop through leakage and through the flushing valve on steering motor (2). The flushing valve diverts oil for lubrication and cooling of the internal components of the steering motor. The lost oil is replaced by the charge circuit through makeup valves.
The charge pump for the implement and steering system (5) draws hydraulic oil from the hydraulic tank (3). The charge pump creates the flow of oil to steering pump (1). The charge oil passes through the pilot and charge filter for the implement and steering system (4). The charge oil replenishes the oil that is being lost from the closed loop through the case drains of the pump and motor. This charge oil is also used by the steering pump control valve to direct oil to the actuator piston for the pump. This piston controls the angle of the pump swashplate.