Pump Control (All Wheel Drive)
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(1) Solenoid Valve
(2) Solenoid Valve (3) Control Spool (4) Control Spool (5) Servo Piston (6) Servo Piston (7) Swashplate (8) Swashplate | |
The AWD piston pump control system contains solenoid valves which move a control piston to direct pilot oil flow to the swashplate servo pistons.
The AWD ECM sends a signal to solenoid valves (1) and (2).
The solenoid valves shift and open internal passages to servo pistons (5) and (6).
The servo pistons tilt pump swashplates (7) and (8) to increase pump stroke.
In forward travel, solenoids "C2" are energized. Oil flows out of the pump at ports "A" and "C".
In reverse travel, solenoids "C1" are energized. Oil flows out of the pump at ports "B" and "D".
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