BRACKET 3K8402 - Caterpillar

SELECTOR VALVE (Top View and End View)
1. Selector valve lever. 2. Selector valve body. 3. Clutch exhaust to sump. 4. Lubricating oil outlet. 5. Pipe assembly. 6. Pressure regulating piston. 7. Piston relief to sump. 8. Pressure regulating double valve. 9. Pressure rise control piston. 10. Selector valve stem. 11. Inlet from oil filter. 12. Lubrication chamber. 13. Oil passage. 14. Ball check exhaust from pressure rise control piston. 15. Orifice inlet to pressure rise control piston. 16. Oil chamber. 17. Passage to rear clutch. 18. Valve stem passage. 19. Valve stem passage. 20. Passage to front clutch.Oil Flow In Neutral Position
With the engine running and the selector valve lever (1) in a neutral position, the oil flow through selector valve body (2) is as follows:
OIL FLOW THROUGH THE SELECTOR VALVE IN NEUTRAL
1. Selector valve lever. 2. Selector valve body. 4. Lubricating oil outlet. 5. Pipe assembly. 6. Pressure regulating piston. 8. Pressure regulating double spring. 9. Pressure rise control piston. 11. Inlet from oil cooler. 12. Lubrication chamber.Oil enters the selector valve at inlet (11) and continues into chamber (12). There is only one path for the oil to follow, since the selector valve stem passages are not aligned with the chamber openings to the clutch cylinders. The open path is to outlet (4) which supplies the pressure relief arrangement in pipe assembly (5) and also opens into the manifold leading to the cooling oil outlets in the clutch hubs.Since there is no oil pressure against the pressure rise control piston (9), the pressure against the pressure regulating piston (6) and double spring (8) is able to push the piston to a position where it offers enough resistance to the oil flow to develop only 25 to 65 psi (170 to 450 kPa). In this position, the piston also uncovers the opening to outlet (4).Neutral to Rear Clutch Drive Position
When the selector lever (1) is moved to the rear clutch drive position, oil flow through the selector valve is as follows:
OIL FLOW THROUGH THE SELECTOR VALVE IN THE NEUTRAL TO REAR CLUTCH DRIVE POSITION
1. Selector valve lever. 3. Clutch exhaust to sump. 4. Lubricating oil outlet. 6. Pressure regulating piston. 8. Pressure regulating double spring. 9. Pressure rise control piston. 10. Selector valve stem. 11. Inlet from oil cooler. 12. Lubrication chamber. 13. Passage. 15. Orifice inlet to pressure rise control piston. 16. Oil chamber. 17. To rear clutch. 18. Valve stem passage. 19. Valve stem passage.In the rear clutch drive position, valve stem passage (18) aligns with passage (17) and valve stem passage (19) aligns with passage (13). Oil flows through inlet passage (11), valve stem passage (18) and out through the rear clutch passage (17). Passage (17) connects with the manifold passage which directs oil to engage the rear clutch.At the same time oil is flowing through valve stem passage (19) and passage (13) which leads to the orifice (15).Oil then enters and fills chamber (16), moving the pressure rise control piston (9) forward and