320D2 GC Excavator Machine Systems Recoil Spring - Assemble 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	g01157185

1. Check the condition of the threads on rod (11) 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 (9). Install rod (11) into support (9). Position support (12).
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   Illustration 2	g00483426

3. 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).

4. 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.

5. The combined weight of the recoil spring assembly is approximately 116 kg (255 lb).

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

7. Adjust the two adjustable supports in order 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 in order to provide a better illustration of level gauge (4).

8. 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

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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.

9. Close covers (7) on Tooling (A). Compress the recoil spring assembly with Tooling (B).
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   Illustration 7	g01157190
   (X) Compressed length of the spring

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   Illustration 8	g00498784

10. Open the covers on Tooling (A). Measure the compressed length of the recoil spring. The compressed length is Dimension (X). Refer to Table 2 for the correct compressed spring length.
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    Table 2

    Recoil Spring Compressed Length
    Model	Dimension (X)
    315D	448.0 mm (17.64 inch)
    319D	550.0 mm (21.65 inch)
    320D	550.0 mm (21.65 inch)
    323D	550.0 mm (21.65 inch)
    	686.0 mm (27.01 inch)(1)
    324D	606.0 mm (23.86 inch)
    325C	551.0 mm (21.69 inch)
    325D	686.0 mm (27.01 inch)
    	845.0 mm (33.27 inch)(2)
    326D L	606.0 mm (23.86 inch)
    328D	644.0 mm (25.35 inch)
    329D	686.0 mm (27.01 inch)
    330D	644.0 mm (25.35 inch)
    	785.0 mm (30.91 inch)(3)
    336D	644.0 mm (25.35 inch)
    	785 mm (30.91inch)(4)

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    (1)	This Dimension is for (S/N: DKW1-Up; SED1-Up; NES1-Up)
    (2)	This Dimension is for (S/N: GBR1-Up; MCL1-Up)
    (3)	This Dimension is for (S/N: ERN1-Up)
    (4)	This Dimension is for (S/N: DTS1-Up; LMG1-Up; JWR1-Up)

11. 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, then assembly of the recoil spring assembly can be completed.
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    Illustration 9	g01157193

12. Apply a rust inhibitor to the threads on the end of the retaining rod for the recoil spring. Install nut (6). Tighten nut (6) with Tooling (D).

13. 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.

14. Attach a suitable lifting device to the recoil spring assembly, and remove the recoil spring assembly from Tooling (A). The weight of the recoil spring assembly is approximately 116 kg (255 lb).

End By:

1. Install the front idler and the recoil spring.