320D2 GC Excavator Machine Systems Load Control Valve (Boom Cylinder) - Remove and Install Caterpillar


Load Control Valve (Boom Cylinder) - Remove and Install
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1.1. Removal Procedure
2.1. Installation Procedure

Removal Procedure

Start By:

  1. 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.


NOTICE

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.



NOTICE

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.


------ WARNING! ------

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.


------ WARNING! ------

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.




    Illustration 1g01219716

  1. Loosen nut (2). Turn seat (1) counterclockwise in order to release the hydraulic pressure in the boom cylinder.


    Illustration 2g01219715

  2. Disconnect hose assemblies (3). Disconnect tube assemblies (4) and (5). Remove bolts (6).


    Illustration 3g01219742

  3. 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).

Installation Procedure



    Illustration 4g01219742

  1. 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).


    Illustration 5g01219715

  2. Install bolts (6). Connect tube assemblies (4) and (5). Connect hose assemblies (3).


    Illustration 6g01219716

  3. Tighten seat (1). Tighten nut (2) to a torque of 2.25 ± .25 N·m (20 ± 2 lb in).

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