VALVE GP-PILOT 1232146 - Caterpillar

LOCATION OF HYDRAULIC LINES FOR DOOR AND EJECTOR CYLINDERS
5. Line from scraper control valve to junction block. 7. Line from junction block to check valve. 10. Check valve. 11. Pilot line to check valve. 12. Line from junction block to rod end of ejector cylinder. 13. Line from scraper control valve to junction block. 17. Line from junction block to head end of ejector cylinder. 21. Line from check valve to head end of door cylinder. 23. Line from junction block to rod end of door cylinder.
DOOR CHECK VALVE
16. Port for pilot line (11). 19. Port for line (7). 20. Port for line (21).
POPPET VALVE FOR EJECTOR KICKOUT
26. Orifice. 27. Poppet valve. 28. Piston. 29. Centering spring. 30. Plunger. 31. Detent balls (three). 32. Detent. C. Ejector spool in RETRACT position. B. Ejector spool in HOLD position.Elevator Circuit
SCHEMATIC OF ELEVATOR IN HIGH SPEED FORWARD POSITION 1. Elevator control valve.2. Spool.3. Elevator speed selector valve.4. Port (connects to elevator motor reverse port).5. Passage (connects to outlet port to tank).6. Elevator motor.7. Make-up valve.8. Port (connects to elevator motor forward port).9. Return passages.10. Outlet port to tank.11. Return passage to tank.12. Detent ball.13. Inlet port from elevator pump.14. Spool.15. Outlet passage to large pump flow.16. Relief valve.17. Steering and scraper pump.18. Elevator pump.A. FORWARD.B. HOLD.C. REVERSE.D. LOW.E. HIGH.When spool (2) is in HOLD position, oil from the pump enters port (13), flows around spool (2) and returns to the tank through outlet port (10). With spool (2) in the HOLD position, ports (4) and (8) are connected to the elevator motor. The elevator motor can "free wheel" in FORWARD or REVERSE depending upon the direction of the external forces on the elevator. If the external forces turn the elevator and motor too fast, make-up valve (7) will open and pump flow will go to the motor to prevent cavitation.Elevator Forward (High Speed)
Push the elevator control lever to move spool (2) to elevator FORWARD position (A). The movement of spool (2) blocks oil flow from inlet port (13) to return passages (9) and (10) and blocks oil flow from elevator REVERSE port (4) to or from elevator FORWARD port (8). With return passage (9) blocked, pump oil pressure increases at port (13) and opens make-up valve (7). Elevator circuit oil flows through the open valve (7), around spool (2) and to the elevator FORWARD port (8). Port (8) is connected to a port of the elevator motor. Oil flow turns the motor in the FORWARD direction. The oil returns from motor through port (4) of the control valve and flows through passage (5) and out port (10) to the tank.Elevator Reverse (High Speed)
Push the elevator control lever to move spool (2) (not illustrated), to elevator REVERSE position (C). The movement of spool (2) blocks oil flow from inlet port (13) to return passage (9) and blocks oil flow between ports (4) and (8). Oil pressure increases and opens valve (7). Oil flows through port (4) to a port in the elevator