THEORY OF OPERATION - CONTINUED
BRAKE AND HYDRAULIC FAN SYSTEM - CONTINUED
When pressure in cavity overcomes force of both load sensing signal and margin spring, oil will flow
around cutoff spool, then over orifice valve, and into signal passage to actuator piston.
Orifice valve will allow a metered amount of oil to flow to actuator piston. When oil pressure behind actu-
ator piston is sufficient, piston will start to move. Piston rod will push swashplate against bias spring.
Swashplate will overcome bias spring, angle of swashplate will start to decrease, and piston pump will
destroke. When piston pump has destroked to desired flow, pump will provide a constant flow.