RING 6U9993 - Caterpillar

At operating temperature, the hydraulic oil is hot and under pressure. Hot oil can cause burns. To prevent possible personal injury, release the pressure in the implement hydraulic circuits (boom, stick and bucket) before any hydraulic lines or components are disconnected or removed.
1. Release the pressure in the hydraulic system as follows: a. Fully retract the rod in the stick cylinder.b. Adjust the position of the bucket so it will be flat on the ground when the boom is lowered.c. Lower the boom until the bucket is flat on the ground.d. Shut off the engine, and put the hydraulic activation control lever in the "Lock" position.e. Move the control levers for the boom, bucket, stick and swing through their full travel strokes. This will relieve any pressure that may be present in the pilot system.f. Slowly loosen the Fill/Vent plug on the hydraulic oil tank to release the pressure.g. Tighten the Fill/Vent plug on the hydraulic oil tank.h. The pressure in the hydraulic system has now been released. Lines and components can now be removed.2. Clean the outside of the swivel joint and the area around the swivel joint prior to removal.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the machine. Be prepared to collect the fluid with suitable containers before opening any compartment containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide", for tools and supplies suitable to collect and contain fluids in Caterpillar machines. Dispose of all fluids according to local regulations and mandates.
3. Put identification marks on six hose assemblies (1) as to their location on the swivel joint. Disconnect six hose assemblies (1) from the swivel joint. Put plugs in the ends of the hose assemblies to keep dirt and debris out of the hydraulic system.4. Remove two bolts (2) and the washers that hold setting plate (3) in position. Remove setting plate (3).5. Remove eight bolts (4).6. Remove one cover bolt from the swivel joint. Fasten Tool (A) to the swivel joint using the cover bolt. Fasten a hoist to Tool (A).
View From Under Machine7. Remove bolts (5) and two cover assemblies (6) from the underside of the undercarriage frame assembly.
View From Under Machine8. Put identification marks on four tube assemblies (7) and four hose assemblies (10) as to their location on the bottom of the swivel joint. Disconnect the four hose assemblies and four tube assemblies from the bottom of the swivel joint. Put plugs in the hose assemblies and tube assemblies to keep dirt and debris out of the hydraulic system.9. Cover the ports in the bottom of the swivel joint with tape to keep dirt and debris out of the unit.10. Remove six bolts (8).11. Remove tee (9) to provide clearance for removal of the swivel joint.12. Remove the swivel joint from the machine. The weight of the swivel joint is 43 kg (95 lb). The following steps are for the installation of the