HOSE AS 4809504 - Caterpillar

a. Move the machine to a smooth horizontal location. Move away from working machines and personnel. Lower all implements to the ground. Install the wheel lean pin in front axle.b. Permit only one operator on the machine. Keep all other personnel either away from the machine or in view of the operator.c. Activate the parking brake. Place all implements on the ground and put the blade in the "FLOAT" position.d. Stop the engine.e. Turn the steering wheel back and forth several times to relieve pressure in the steering accumulator.f. Carefully loosen the filler cap on the hydraulic tank to release pressure in the tank.g. Be sure all hydraulic pressure is released before any fitting, hose, or component is loosened, tightened, removed or adjusted.h. Tighten the cap on the hydraulic tank.i. The pressure in the hydraulic system must be released before lines or components can be removed.
Hydraulic pressure can exist in the hydraulic lines between the control valves and the cylinders with the engine stopped. Manually relieve pressure before working on any hydraulic circuit.
2. Drain the oil from hydraulic tank in a suitable container for storage or disposal. The capacity of the hydraulic system is 38 L (40 quarts). 3. Remove bolt (1) and the clamp holding the wiring harness to hydraulic tank support (4).4. Position block (6) to support the hydraulic tank.5. Remove bolt (2), the nut and the washer from hydraulic tank support (4). Remove bolt (3), the nut and two washers from hydraulic tank support (4) and the bracket on the hydraulic oil tank. Remove bolts (5) and washers from hydraulic tank support (4).6. Remove hydraulic tank support (4) from the cab.
Tandem is removed for photo clarity7. Disconnect oil line (8) and oil line (9) from articulation cylinder (10). Plug the fittings on these lines in order to prevent the loss of hydraulic oil, and in order to keep dirt out of the hydraulic system.8. Fasten a lifting sling and a hoist to articulation cylinder (10).9. Remove bolts (7) and (11) and washers from the bottom of the articulation cylinder retention pins.10. Install Tooling (A) and remove the articulation cylinder retention pins.11. Remove washers (12) while removing articulation cylinder (10). The weight of articulation cylinder (10) for the 120H and 135H is 31.5 Kg (69 lb). 12. Use Tooling (B) in order to remove the two seals and the bearing from each end of articulation cylinder (10).13. Repeat Steps 3 through 11 to remove the remaining articulation cylinder on the other side of the machine. The following steps are for the installation of the articulation cylinders.14. During the installation of the articulation cylinders, check the condition of all the O-ring and lip seals used in the assemblies. If any of these seals are damaged, use new parts for replacement. Do not use impact type tools in order to install the bearings in the articulation cylinders. 15. Use Tooling (C) in order install the bearing and the two seals to each end of articulation cylinder (10). The