TOOL 1F0479 - 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.1. Drain the oil from the hydraulic oil tank. The capacity of the tank is 55 liter (15 U.S. gal). 2. Remove two bolts (1) and reposition valve (2) out of the way. 3. Remove four nuts (3) and remove cover (4). 4. Disconnect two hydraulic hose assemblies (5). 5. Disconnect six hydraulic hose assemblies (6).6. Fasten a lifting strap to steering control valve (7) as shown. Remove three bolts (8) and remove steering control valve (7). The weight of the steering control valve 27 kg (60 lb) Install the steering control valve in the reverse order of removal.7. Fill the hydraulic oil tank with oil to the correct level. See the Operation & Maintenance Manual for the correct filling procedure.End By:a. install cabDisassemble & Assemble Steering Control Valve
Start By:a. remove steering control valve 1. Remove bolts (1) and pilot valve spool body (2). 2. Remove check balls (4) and springs (3).3. Remove fitting (6) to remove pilot valve spool (5). 4. Remove bolts (8) and remove cover (7). 5. Remove valve (13) from the steering control valve body. Remove bolt (9), spacer (14), spring retainer (10), spring (11), spacer (15), retainer (12), and shims (16) from valve spool (13). 6. Remove line relief valve (17) from the steering control valve.7. Remove plug (20), spring (19), and check ball (18). The following steps are for the installation of the steering control valve. 8. Install check ball (18), spring (19), and plug (20) in the steering control valve.9. Install line relief valve (17) in the steering control valve. 10. Install shims (16), retainer (12), spacer (15), spring (11), spring retainer (10), spacer (14), and bolt (9) in valve spool (13). Install valve spool (13) in the steering control valve. 11. Install cover (7) and bolts (8). 12. Install pilot valve spool (5) and install fitting (6).13. Install springs (3) and check balls (4). 14. Install pilot valve spool body (2) and bolts (1).End By:a. install steering control valve