DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM Pressure Flow Compensating (PFC) Pump Hydraulic System PFC Pump Schematic 12 9. Return Filter Base 13. PFC Pump Assembly 14. Hydraulic Reservoir 15. Signal Line to Compensator 16. Signal Line Screen 17. Flow Control Spool 18. Pump Discharge Port 19. High Pressure Spool 20. Servo Piston (swashplate) 21. Rotating Assembly 22. Case Drain 23. Temperature Sensor 24. Supply Manifold A.10.A / 18