320D3 Hydraulic Excavator Machine Systems Caterpillar

Assembly Procedure

Note: Cleanliness is an important factor. Before assembly, all parts should be thoroughly cleaned 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 later trouble. Inspect all parts. If any parts are worn or damaged, use new parts for replacement. All disassembly and all assembly procedures must be performed on a clean work surface and in a clean hydraulic area. Keep cleaned parts covered and protected.

Note: Check seals for wear or for damage. Replace seals, if necessary.

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Illustration 1	g06311258

1. Install backup ring (34) and seal (33) onto the head.

2. Install sleeve bearing (35) and ring (36) into the head.
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   Illustration 2	g06311257

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   Illustration 3	g06311095
   Orientation of the seals

3. Install seal (28), seal (29), back up ring (30), seal (31), and ring (32) into the head.
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   Illustration 4	g06311256

4. Install head (27).
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   Illustration 5	g06311254

5. Install rings (23) and seal (26) into the piston.

6. Install ring (25), ring (22), seal assembly (24), ring (21), and ring (20) onto the piston.
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   Illustration 6	g06311252

7. Install stopper (19) and piston (18). Tighten piston (18) to a torque of 980 to 1176 N.m (723 to 867 lb ft).
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   Illustration 7	g06311249

8. Apply Tooling (B) to the threads of set screw (16). Install the balls, plunger (17), and set screw (16).
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   Illustration 8	g06311248

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   Illustration 9	g06311474

9. Install lock nut (15). Tighten lock nut (15) to a torque of 1862 to 1960 N.m (1373 to 1446 lb ft).

10. Before installing ball (14), form a dimple on the piston rod groove using Tooling (A). Install ball (14).

11. Apply Tooling (B) to the threads of set screw (13). Install set screws (13). Tighten set screw (13) to a torque of 49.0 ± 9.8 N.m (36.1 ± 7.2 lb ft).

12. Stake set screw (13) in two places as shown in Illustration 9.
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    Illustration 10	g06311245

13. Install rod assembly (12) and bolts (11). Tighten bolts (11) to a torque of 333.2 to 352.8 N.m (245.8 to 260.2 lb ft).
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    Illustration 11	g06311244

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    Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment.

14. Install orifice (6), spring (7), spacer (8), O-ring seal (10), and plug (9). Tighten plug (9) to a torque of 44.1to 53.9 N·m (32.5 to 39.8 lb ft).
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    Illustration 12	g06311243

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    Illustration 13	g06319183
    Orientation of seals (4)

15. Install sleeve bearing (5) and seals (4).
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    Illustration 14	g06310737

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    Illustration 15	g06319183
    Orientation of seals (1)

16. Install sleeve bearing (2) and seals (1).

17. Install fitting (3). Tighten fitting (3) to a torque of 9.8 ± 19.6 N.m (86.7 ± 173.5 lb in).

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1. Install the stick cylinder.