- Release the hydraulic system pressure.
Note: Put identification marks on all hoses, on all hose assemblies, on all wires, and on all tube assemblies for installation purposes. Plug all hose assemblies and all tube assemblies. This helps to prevent fluid loss, and this helps to keep contaminants from entering the system.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.
Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.
Dispose of all fluids according to local regulations and mandates.
Keep all parts clean from contaminants.
Contamination of the hydraulic system with foreign material will reduce the service life of the hydraulic system components.
To prevent contaminants from entering the hydraulic system, always plug or cap the lines, fittings, or hoses as they are disconnected. Cover any disassembled components and clean them properly before assembly.
Clean the hydraulic system properly after any major component exchange or especially after a component failure, to remove any contamination.
At operating temperature, the hydraulic oil is hot and under pressure. Hot oils can cause burns.
To prevent possible personal injury, release the pressure in the work tool hydraulic circuit (boom, stick, bucket, and swing), travel circuits, and the hydraulic oil tank at the filler cap before any hydraulic lines or components are disconnected or removed.
Remove the filler cap only when the engine is stopped and the filler cap is cool enough to touch.
Cylinders equipped with lock valves can remain pressurized for very long periods of time, even with the hoses removed.
Failure to relieve pressure before removing a lock valve or disassembling a cylinder can result in personal injury or death.
Ensure all pressure is relieved before removing a lock valve or disassembling a cylinder.
- Loosen nut (2). Turn seat (1) counterclockwise in order to release the hydraulic pressure in the boom cylinder.
Illustration 2 g01219715
- Disconnect hose assemblies (3). Disconnect tube assemblies (4) and (5). Remove bolts (6).
Illustration 3 g01219742
- Remove bolts (8). Use two people to remove the load control valve (7). The weight of load control valve (7) is approximately
32 kg (70 lb).
- Use two people to position the load control valve (7). The weight of load control valve (7) is approximately
32 kg (70 lb). Install bolts (8).Show/hide table Illustration 5 g01219715
- Install bolts (6). Connect tube assemblies (4) and (5). Connect hose assemblies (3).
Illustration 6 g01219716
- Tighten seat (1). Tighten nut (2) to a torque of
2.25 ± .25 N·m (20 ± 2 lb in).