VALVE GP-PRESSURE REDUCING 2W2751 - Caterpillar

All tests and adjustments must be made with the oil in the hydraulic control system at normal operating temperature. Be sure the linkage adjustments are correct before making any tests.
TRANSMISSION HYDRAULIC CONTROLS (FIRST SPEED FORWARD, ENGINE RUNNING) 1. Torque converter.2. Load piston.3. Body of sequence and pressure control valve.4. Oil filter.5. Body of relief valve for converter outlet.6. Relief valve for converter outlet.7. Torque converter solenoid.8. Pressure control valve.9. Sequence valve.10. Oil cooler.11. Oil pump.12. Speed selection spool.13. Load piston.14. Modulation relief valve.15. Screen.16. Pressure differential and safety valve.17. Direction selection spool.18. Transmission neutralizer valve.19. Inlet pressure valve for torque converter.20. Body of pressure control valve.21. Reservoir in transfer gear case.A. Pressure tap for pump (on filter).B. Pressure tap for speed clutch (P1).C. Pressure tap for converter outlet.D. Pressure tap for transmission lubrication.E. Pressure tap for converter inlet.F. Pressure tap for speed clutch (P1).G. Pressure tap for direction clutch (P2).C1. No. 1 clutch.C2. No. 2 clutch.C3. No. 3 clutch.C4. No. 4 clutch.C5. No. 5 clutch.C6. No. 6 clutch.Location Of The Pressure Taps
A. Oil pump (on filter).
D. Planetary lubrication.
F. Speed clutch (P1). G. Direction clutch (P2). H. Plug for load piston (LP).
(5P6586 Transmission Test Cover installed). E. Torque converter inlet. F. Speed clutch (P1). G. Direction clutch (P2).
TRANSMISSION PRESSURE CONTROL VALVE
12. Speed selection spool. 13. Load piston. 14. Modulation relief valve. 16. Pressure differential and safety valve. 17. Direction selection spool. 19. Inlet pressure valve for torque converter. 22. Spacers. Bench Test Of Transmission Control Lock
TRANSMISSION CONTROL LOCK
1. Inlet passage for brake pressure oil. 2. Sleeve. 3. Drain passage. 4. Rail (connected to direction selection spool). 5. Detent. 6. Nut (connected to direction cable from cab).1. Send a pressure of approximately 650 psi (45.7 kg/cm2) (4482 kPa) into passage (1).2. With a pressure of 650 psi (45.7 kg/cm2) (4482 kPa) into passage (1), shift rail (4) must move in either direction with a small amount of resistance. When the shift rail is released, it must stay in that position.3. Lower the pressure into passage (1) to approximately 400 psi (28.1 kg/cm2) (2758 kPa).4. With a pressure of 400 psi (28.1 kg/cm2) (2758 kPa) into passage (1), shift rail (4) must move in either direction against the force of the springs for detent (5) and sleeve (2). When the shift rail is released, it must be returned to its NEUTRAL position by the force of the springs.Transmission Control Linkage Adjustments
TRANSMISSION CONTROL LINKAGE 1. Steering wheel.2. Control handle.3. Stop.4. Bolts.5. Rack.6. Lever assembly.7. Bellcrank assembly.8. Adjustable steering column.9. Direction control cable.10. Speed control cable.11. Direction selection spool (part of transmission pressure control valve).12. Transmission control lock group.13. Speed selection spool (part of transmission pressure control valve).
Do not make any adjustments to the linkage with the engine running.
1. Before an adjustment is made to the speed and direction control linkages, check stop (3) for proper adjustment. Stop (3) must move lever assembly (6) to the NEUTRAL position when the steering column is moved all the way forward (stored