CYLINDER GP 4T7819 - Caterpillar

Important Information
When testing must be done in a closed area, activate the brakes and use blocks to prevent the machine from moving during the tests. Let only approved personnel on the machine. Keep other personnel off the machine and in view of the operator.
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.
HYDRAULIC CONTROLS (FIRST SPEED FORWARD)
1. Oil pump. 2. Oil filter. 3. Magnetic strainer. 4. Oil sump. 5. Oil line to the hydraulic booster for the steering clutch. 6. Lubrication relief valve. 7. Oil line for transmission lubrication. 8. Oil line for lubrication of the bevel gear, pinion and transfer gears. 9. Load piston. 10. Body of the pressure control and selector valve. 11. Modulating relief valve. 12. Oil cooler. 13. Check valve. 14. Differential valve. 15. Spool for speed selection. 16. Orifice. 17. Spool for direction selection. 18. Torque converter. 19. Safety valve. 20. Relief valve for converter inlet. A. and B. Pressure taps for the oil pump. C. Pressure tap for the speed clutch. D. Pressure tap for the direction clutch. E. Opening to the check valve (drain opening for oil behind load piston). F. Pressure tap for the inlet to the torque converter. G. Pressure tap for the steering clutch booster. H. Pressure tap for lubrication. J. Pressure tap for the outlet from the torque converter.Location Of The Pressure Taps And Transmission Testing
A. Oil pump.
B. Oil pump. C. Speed clutch. D. Direction clutch. E. Opening to the check valve. F. Inlet to the torque converter.
G. Steering clutch booster.
H. Lubrication.
J. Outlet from the torque converter.
EARLIER 3S2599 PRESSURE CONTROL AND SELECTOR VALVE
LATER 3S2599 PRESSURE CONTROL AND SELECTOR VALVE
9. Load piston. 10. Body of the pressure control and selector valve. 11. Modulating relief valve. 13. Check valve. 14. Differential valve. 15. Spool for speed selection. 17. Spool for direction selection. 19. Safety valve. 20. Relief valve for converter inlet. 21. Spacers. 22. Spacers. Control Valves And Linkage Adjustment (95J1-95J371); (96J1-96J4182)
Do not make any adjustments to the linkage with the engine running.
HYDRAULIC CONTROL LINKAGE
26. Selector lever. 27. Neutral slot in shift guide. 28. Cam for direction selection. 29. Rod. 30. Rod. 31. Cam for speed selection. X. Selector lever in center of shift guide (neutral slot) Y. Selector lever in NEUTRAL FORWARD position.1. Put cam (28) for direction selection in the FORWARD (F) position. Make an adjustment to rod (29) so selector lever (26) is in the NEUTRAL FORWARD (Y) position. Move selector lever (26) in the NEUTRAL REVERSE position. Check to be sure that cam (28) moves to the REVERSE position.2. Put cam (31) for speed selection in the NEUTRAL (N) position. Make an adjustment to rod (30) so selector lever (26) is in the center of neutral slot (27) in the shift guide, position (X).
HYDRAULIC CONTROL VALVE
10. Body of the pressure control and selector valve. 15. Spool for speed selection. 17. Spool for direction selection.