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	g06311628

1. Install backup ring (25) and seal (24) onto the head.

2. Install sleeve bearing (26) and ring (27) into the head.
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   Illustration 2	g06311627

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   Illustration 3	g06311095
   Orientation of the seals.

3. Install seal (19), seal (20), back up ring (21), seal (22), and ring (23) into the head.
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   Illustration 4	g06311626

4. Install head (18).
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   Illustration 5	g06311624

5. Install rings (15) and seal (17) into the piston.

6. Install rings (16), seal assembly (13), and ring (14) onto the piston.
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   Illustration 6	g06311623

7. Install stopper (11) and piston (12). Tighten piston (12) to a torque of 980 to 1176 N.m (723 to 867 lb ft).
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   Illustration 7	g06311621

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   Illustration 8	g06311918

8. Install lock nut (10). Tighten lock nut (10) to a torque of 1862 to 1960 N.m (1373 to 1446 lb ft).

9. Before installing ball (9), form a dimple on the piston rod groove using Tooling (A). Install ball (9).

10. Apply Tooling (B) to the threads of set screw (8). Install set screw (8). Tighten set screw (8) to a torque of 49.0 ± 9.8 N.m (36.1 ± 7.2 lb ft).

11. Stake set screw (8) in two places as shown in Illustration 8.
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    Illustration 9	g06311617

12. Install rod assembly (7) and bolts (6). Tighten bolts (6) to a torque of 333.2 to 352.8 N.m (245.8 to 260.2 lb ft).
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    Illustration 10	g06311614

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    Illustration 11	g06319155
    Orientation of seals (4)

13. Install sleeve bearing (5) and seals (4).

14. 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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    Illustration 12	g06311602

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    Illustration 13	g06319155
    Orientation of seals (1)

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

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1. Install the boom cylinder.