301.6C and 301.8C Mini Hydraulic Excavators Machine Systems Caterpillar

Removal Procedure

Note: Cleanliness is an important factor. Before you begin the removal procedure, the exterior of the components should be thoroughly cleaned. This will help to prevent dirt from entering the internal mechanism.

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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.

1. Fully extend the undercarriage.

2. Raise the boom until the boom cylinder is fully extended. Fully extend the stick cylinder and the bucket cylinder.

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3. Attach Tooling (A), Tooling (B), and a suitable lifting device to the machine. The weight of the machine is approximately 1695 kg (3737 lb).

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4. Position the machine on Tooling (C) and suitable blocking so that the bottom of the track is approximately 254 mm (10.0 inch) from the ground.

5. Lower the bucket onto suitable blocking.

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6. Remove cover (1) .

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7. Loosen nut (5) and disconnect rod assembly (4) .

8. Remove bolt (3) .

9. Retract cylinder (2) .

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10. Disconnect hose assemblies (6). Loosen nut (8) and disconnect rod assembly (9) .

11. Remove bolt (7) and cylinder (2) .

Disassembly and Assembly Information

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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.

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(1) Apply Tooling (E) to the threads and tighten the nut to a torque of 235 ± 24 N·m (173 ± 18 lb ft).

(2) Apply Tooling (E) to the threads. Torque for head to 450 ± 50 N·m (332 ± 37 lb ft)

(3) Lubricate sealing lips with a thin covering of the lubricant that is being sealed.

Installation Procedure

Note: Cleanliness is an important factor. Before assembly, thoroughly clean all parts in cleaning fluid. Allow the parts to air dry. Do not use wiping cloths or rags to dry parts. Lint may be deposited on the parts which may cause trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement. Dirt and other contaminants can damage the precision component. Perform assembly procedures on a clean work surface. Keep components covered and protected at all times.

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Illustration 7	g01179357

1. Position cylinder (2) and install bolt (7) .

2. Connect hose assemblies (6). Connect rod assembly (9) and tighten nut (8) .

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3. Extend cylinder (2).

4. Release the hydraulic system pressure. Refer to Disassembly and Assembly, "Hydraulic System Pressure - Release".

5. Install bolt (3) .

6. Connect rod assembly (4) and tighten nut (5) .

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7. Install cover (1) .

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8. Attach Tooling (A), Tooling (B), and a suitable lifting device to the machine. The weight of the machine is approximately 1695 kg (3737 lb). Position the machine on the ground.