HOSE 2607469 - Caterpillar

HYDRAULIC SYSTEM COMPONENTS
1. Left steering cylinder. 2. Line (control valve to rod end of left cylinder and head end of right cylinder). 3. Right steering cylinder. 4. Line (control valve to head end of left cylinder and rod end of right cylinder). 5. Small section of implement and steering pump. 6. Line (pump to control valve). 7. Return line to tank. 8. Steering control valve. 10. Spool connection to steering gear assembly. 12. Hydraulic tank. 13. Drain line (control valve to tank).When making a right turn, oil is directed through line (4) to the head end of the left steering cylinder and the rod end of the right steering cylinder. The left cylinder rod extends and the right cylinder rod retracts, moving the front frame to the right. Oil from the rod end of the left cylinder and the head end of the right cylinder returns to the supply tank (12) through line (2), control valve (8) and line (7). When making a left turn, the oil flow is reversed. The right cylinder rod extends and the left cylinder rod retracts.Flow Of Oil In Neutral Position
When control valve spool (20) is in NEUTRAL (centered position), the vehicle is not steering. Oil pressure in steering cylinders (1 and 2) is equal because of the small amount of pump oil from passage (14) flowing through slots (A) into passages (12 and 16) which lead to the steering cylinders through lines (4 and 7).The equal pressure in both cylinder eliminates erratic steering cylinder operation by preventing a rapid pressure buildup. A small amount of oil is allowed to circulate through control valve spool unloading slots (18) to the cylinders to compensate for steering shock.Oil from the pump enters the valve body through passage (14). With control valve spool (20) in NEUTRAL position, the valve spool blocks most of the oil flow to cylinder ports (12 and 16). Oil pressure overcomes the force of springs (17), moving valve (13) to the left. As valve (13) moves, passage (11) is opened to tank and pump oil is returned to the supply tank.
HYDRAULIC SYSTEM COMPONENTS
1. Left steering cylinder. 2. Right steering cylinder. 3. Pressure oil supply line to passage (13). 4. Line from outlet port (11) to head end of left cylinder and rod end of right cylinder. 5. Steering control valve. 6. Spool valve connection to steering gear assembly. 7. Line from outlet port (15) to head end of right cylinder and rod end of left cylinder. 8. Return oil line from passage (11).
FLOW OF OIL IN NEUTRAL POSITION
9. Spring. 10. Chamber. 11. Return passage to oil tank. 12. Outlet port to cylinder. 13. Valve. 14. Inlet passage from oil pump. 15. Spacer. 16. Outlet port to cylinder. 17. Springs. 18. Unloading slots. 19. Centering spring. 20. Spool. 21. Passage. 22. Passage. 23. Passage. 24. Shuttle valve.Oil in chamber (10) is displaced by valve (13) through passages (21, 22 and 23), through shuttle valve (24), to outlet ports (12) or (16) and out