GASKET 3907012 - Caterpillar

1. Put identification marks on six hose assemblies (1) for installation purposes. Disconnect the six hose assemblies.2. Disconnect two electrical connectors (2). 3. Remove clamp (8). Remove tube assembly (5).4. Remove tube assemblies (3) and (4).5. Remove two bolts (6).6. Remove support (7) and the tube assemblies as a unit. 7. Put identification marks on four hose assemblies (10) for installation purposes. Disconnect the four hose assemblies from the swing control valve.8. Put identification marks on three hose assemblies (9) for installation purposes. Disconnect the three hose assemblies from the swing control valve. 9. Fasten two lifting straps and a hoist to swing control valve (12) as shown. Remove eight bolts (11). Remove the swing control valve. The weight of the swing control valve is 43 kg (95 lb). The following steps are for the installation of the swing control valve.10. Check the condition of all O-ring seals used in the hose and tube assemblies that are connected to the swing control valve. If any of the seals are worn or damaged, use new parts for replacement.11. Install the swing control valve in the reverse order of removal.End By:install drift reduction valve (stick)Disassemble & Assemble Swing Control Valve
Start By:a. remove swing control valve1. Make sure the outside of the swing control valve is thoroughly clean prior to disassembly. During disassembly of the swing control valve, mark all components so they can be reinstalled in their original locations.
There is spring force behind each housing (2). When bolts (1) are removed, the spring force will be released. To prevent possible personal injury, slowly and evenly remove bolts (1) while retaining housings (2).
2. While retaining housings (2), slowly and evenly loosen bolts (1) to release the spring force. Remove the bolts and housings. If necessary, remove the plunger assembly from each housing (2).3. Remove retainers (4), springs (5) and (6) and retainers (7) from the valve housing.4. Remove O-ring seal (3) from each housing (2). 5. Remove valve group (8) from the valve housing. Remove the plug, seat, ball, two rings and two seals from the valve housing.6. Remove spool (9) from the valve housing. 7. Remove plug (10), spring (12) and valve (13) from the valve housing. Remove O-ring seal (11) from plug (10). 8. Remove plugs (14), springs (16) and valves (17) from the valve housing. Remove O-ring seal (15) from each plug (14). The following steps are for the assembly of the swing control valve.9. Make sure all parts of the swing control valve are thoroughly clean prior to assembly. Put clean hydraulic oil all internal components during assembly.10. Check the condition of all O-ring seals used in the swing control valve. If any of the seals are worn or damaged, use new parts for replacement.11. Assemble the swing control valve in the reverse order of disassembly. Tighten the plug for valve group (8) to a torque of 25 5 N m (18 4 lb ft).12. If the plunger assemblies from housings (2) were removed, reinstall