CONTROL GP-JOYSTICK 3350510 - Caterpillar

At operating temperature, the hydraulic oil tank is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in the hydraulic system before any hydraulic lines or components are disconnected or removed.
Release the pressure in the hydraulic system as follows:a. Shut off the engine.b. Move the control levers through their full travel strokes. This will relieve any pressure that may be present in the pilot system.c. Slowly loosen the air breather cap on the hydraulic oil tank to release the pressure.d. Tighten the air breather cap on the hydraulic oil tank.e. The pressure in the hydraulic system has now been released. Lines and components can now be removed. Drain the hydraulic tank. 1. Remove four bolts and washers (2) and elbow (1).2. Remove four bolts and washers (5) and elbow (6).3. Remove four bolts and washers (3) and elbow (4). 4. Attach a lifting strap as shown.5. Remove two mounting nuts and washers (7) and hydraulic pump (8). Install in the reverse order. Refer to the topic "Lubricant Viscosities and Refill Capacities" in the Operation and Maintenance Manual and fill the hydraulic system with hydraulic fluid.Disassemble Implement Hydraulic Pump
Start By:a. remove implement hydraulic pump Make a mark across the cover assembly for correct installation of parts. 1. Remove four bolts (1) from the cover assembly. 2. Make a separation of the cover assembly. 3. Make a note of the direction of the rotation arrow on the front cartridge (2) cam ring. Make a mark to show the direction of rotation on the front cover (4). Remove cartridge (2) from the front cover (4) and shaft (3). 4. Remove one O-ring seal (5) and two ring seals (6) from the front cover. Remove the outer bearing retainer from the front cover and remove the bearing, shaft and washer. 5. Remove retainer (7) from the shaft with tool (A). Remove bearing (8) and washer (9). 6. Remove O-ring seal (10). Remove lip type seal (11) from each side of the front cover. Check the condition of the seals. If the parts have damage, use new parts for replacement. 7. Remove O-ring seal (13) and seal ring (12) from the cartridge. 8. Remove two socket head bolts (16) and make a separation of the cartridge assembly. Make a note of the direction of the rotation arrows on cam ring (15) and rotor (14). 9. Remove two seal and retainer assemblies (17) from each end plate (18). 10. Remove and inspect O-ring seal (19) from each retainer (20). The sharp edge of the vane (22) goes toward the direction of rotation of rotor (14).11. Remove ten vanes (22) and ten vane inserts (21). 12. Make a note of the direction of rotation arrow on the rear cartridge (23) cam ring. Make a mark on the rear cover (26). Remove O-ring seal (24) and seal ring (25) from the rear cartridge. Remove O-ring seal (27) and two ring seals (28) from the rear cover.13. Disassemble the