320D3 Hydraulic Excavator Machine Systems Caterpillar

Assembly Procedure

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The spring of the recoil spring assembly is compressed under several tons of force. Do not attempt to compress or release the tension of the spring with the nut on the end of the retaining rod. Damaged threads on the retaining rod or nut can cause the assembly to come apart with force, resulting in injury or death.

Note: Prior to assembling the recoil spring assembly, make sure that Tooling (A) is on a level surface.

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Illustration 1	g06320067

1. Check the condition of the threads on track adjuster (12) and nut (6). If the threads are worn or damaged, use new parts for replacement.

2. Assemble the recoil spring assembly loosely. Position spring (10) onto support (11). Install support (9) onto track adjuster (12).

   Note: Ensure that the chamfer on spacer (13) is facing towards track adjuster (12).

3. Install spacer (13) onto track adjuster (12). Install track adjuster (12) into support (11).
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   Illustration 2	g00483426

4. Install Tooling (C) on Tooling (B).
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   Illustration 3	g00494710

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   Illustration 4	g00483437

   Note: Two adjustable supports (1), reaction plate (2), and movable plate (3) are part of Tooling (A).

5. Adjust the spacing between reaction plate (2) and movable plate (3) so that the spacing is approximately the same length as the recoil spring assembly. Also, make sure that two adjustable supports (1) are positioned between the reaction plate and the movable plate, as shown. Level the two supports.

   Note: The recoil spring assembly may be installed in Tooling (A) from the end. In this case, reaction plate (2) must be removed. Then reinstall the reaction plate after the recoil spring assembly is in place on two adjustable supports (1).

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   NOTICE
   Do not remove the hoist from the recoil spring assembly until the unit is leveled, centered and locked in the specified tooling.

6. The combined weight of the recoil spring assembly is approximately 137 kg (302 lb).

7. Fasten a suitable lifting device to the recoil spring assembly. Position the recoil spring assembly on two adjustable supports (1) in Tooling (A).

8. Adjust the two adjustable supports to align the centerline of the recoil spring assembly with the centerline of Tooling (A).
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   Illustration 5	g00949740
   The hoist has been removed from the recoil spring assembly to provide a better illustration of level gauge (4).

9. Operate Tooling (B) and guide the end of the recoil spring assembly through the hole in reaction plate (2). Put a level gauge (4) on the recoil spring assembly. Make sure that the recoil spring assembly is level and centered in Tooling (A). Remove the suitable lifting device from the recoil spring assembly.
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   Illustration 6	g00498784

10. Close covers (7) on Tooling (A). Compress the recoil spring assembly with Tooling (B).
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    Illustration 7	g02723162

11. Open the covers on Tooling (A). Measure the assembled length of the recoil spring. The Compressed Length must be 550 ± 1.5 mm (22 ± 0.06 inch).

12. If the assembled length is not correct, close covers (7) on Tooling (A) and adjust the spring length with Tooling (B). If the assembled length is correct, the assembly of the recoil spring assembly can be completed.
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    Illustration 8	g00711947

13. Apply Tooling (D) to the threads on nut (6). Install nut (6).

14. Apply Tooling (E) on the threads of the socket head bolts that hold strip (8) in place. Install the strip and the socket head bolts that hold the strip.

15. Fasten a suitable lifting device to the recoil spring assembly and remove the recoil spring assembly from Tooling (A). The combined weight of the recoil spring assembly is approximately 137 kg (302 lb).

End By:

1. Install the front idler and the recoil spring.