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| Illustration 1 | g00509561 |
(1) Diverter valve (2) Solenoid (3) Hydraulic displacement control valve (A) Input port (B) Input port (C) Output port (D) Output port (E) Input port (F) Input port | |
Diverter valve (1) is a two-position, four-way directional electrohydraulic valve. Diverter valve (1) directs the signal pressure oil from the steering control to hydraulic displacement control valve (3) .
Signal pressure oil for a right turn enters through input port (A) .
Signal pressure oil for a left turn enters through input port (B) .
Output line (C) is connected to input port (E) of hydraulic displacement control valve (3) .
Output line (D) is connected to input port (F) of hydraulic displacement control valve (3) .
During forward or neutral operation, no electrical signal is sent to solenoid (2). The solenoid stem directs the signal oil diagonally through the manifold.
Input port (B) is connected to output port (C). Input port (A) is connected to output port (D) .
When the machine is operated in reverse, an electrical signal from the electronic control module is sent to solenoid (2) .
The current energizes the solenoid coil. This pulls the solenoid stem toward the coil. The passage for the signal oil is now reversed.
While solenoid (2) is energized, input port (B) is connected to output port (D) and input port (A) is connected to output port (C) .
An energized solenoid (2) reverses the port connections. Now, the signal pressure is sent to the control port that is used for forward operation and neutral operation of hydraulic displacement control valve (3) .
The reversed hydraulic connections reverse the direction of the oil flow from the steering pump. This gives the machine a conventional sense of steering when the machine is operated in reverse.