The implement system is composed of the following components:
- Implement and steering pump
- Control manifold (steering pilot oil backup)
- Steering control valve
- Implement control valve
- Cylinders and the circle drive
- Shuttle valve
The piston pump transfers oil from the tank to the control manifold. The control manifold will send some of the pump supply oil to the pilot system. The oil that is not used by the control manifold will flow to the steering control valve. The steering system has priority over the implement system. When the demands of the steering circuit are met, the steering control valve will direct oil to the implement circuit. Oil flows from the steering control valve to the implement control valves. The implement control valves will direct oil to the cylinders or circle drive.
(B) Blade lift
(C) Blade lift
(D) Wheel lean
(E) Circle drive
(G) Side shift
(H) Blade tip
There are nine standard implement circuits on the machine. Eight control valves are for cylinder circuits and one control valve is for the motor that rotates the blade around the drawbar. The implement system can accommodate as many as fourteen implement control valves. The individual control valves regulate the operation of each implement. When the operator moves the joystick control, an electrical signal is sent to a directional solenoid. When the solenoid is energized, pilot oil will be directed to one side of the valve spool. The valve spool will shift. Oil will be directed to the corresponding implement.
Some of the Motor Graders may have different implements. The number of the control valves in each valve group may vary. When an implement control valve is replaced, use the same part number. This will keep the control valve and the cylinder matched.
Reference: For additional information on the hydraulic system, refer to the hydraulic schematic for your machine.