DISTRIBUTION SYSTEMS - PRIMARY HYDRAULIC POWER SYSTEM Hydraulic Schematic 10 1. Reservoir Strainer 2. Spreader/Rotary Air Screen Drive Pump 3. Fan Drive Pump 4. Spreader Drive Valve 5. Rotary Air Screen Valve 6. Oil Cooler 7. Oil Cooler By-Pass Valve 8. Fan Drive Valve 9. Return Filter Base 10. Filter By-Pass Valve 11. Filter Restriction Indicator Switch 12. Back Flow Check Valve 13. PFC Piston Pump 14. Reservoir Tank 15. Return From All Hydraulic Functions A.10.A / 14