You must read the warnings and instructions which are contained in the safety section of this manual. Before you perform any operation or maintenance procedures ensure you understand the warnings and instructions.

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Check Condition

1. Park the machine on level ground. Fully retract the boom and lower the boom.

2. Remove the cover from the rear of the chassis.

3. A limited inspection of the chains can be made through the rear of the boom. The boom extension chain can be inspected by fully extending the boom and looking on top of the intermediate section. If the chains are corroded, the chains must be removed from the boom for cleaning and a full inspection. If the chains require lubricant, the chains must be removed from the boom for cleaning and a full inspection. Refer to the Hydraulic System Systems Operation, Testing and Adjusting, “Boom Chain – Clean/Inspect/Lubricate”or consult your Caterpillar dealer

4. Set the minimum distance to 224 mm (8.8 inch) between boom section 2 and boom section 3. The maximum allowable distance is 234 mm (9.2 inch). Tighten extension chain (1) in order to move section 3 outward. Tighten retraction chain (2) in order to move section 3 inward. If the distance is significantly more than 224 mm (8.8 inch), slacken both chains and refer to Step 1.

5. After setting the distance to the required tolerance, tighten the extension chain to 20 N-m (15 lb ft).

6. Tighten the retraction chain to 18 N-m (13 lb ft).

7. Tighten the extension chain to 105 ± 5 Nm (77 ± 4 lb ft).

8. Tighten the retraction chain to 70 ± 5 Nm (52 ± 4 lb ft).

9. Extend the boom and retract the boom several times. Check the torque for the extension chain. Check the torque for the retraction chain.

10. Install the locknut for the extension chain. Torque the locknut for the extension chain to 105 ± 5 Nm (77 ± 4 lb ft).

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11. Install the locknut for the retraction chain. Torque the locknut for the retraction chain to 70 ± 5 Nm (52 ±
4 lb ft).

12. Check the shackles on both chains. If necessary, adjust the shackles in order to set the shackles horizontally.

13. Remove the stand and lower the boom.

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