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Boom & AttachmentsXR620/621/842/1045/1245/1254/1267/1534/2050/3034• Measuring the amount of wear on the edge of a chain link plate.• Measuring the amount of elongation (stretch) of a 12-inch sample of chain.NOTE: Because of boom construction, access to the retract chain is very limited. Thechain must be inspected by a mechanic through a small inspection opening in the bottomof the boom while another mechanic very slowly extends and retracts the boom. Becauseof these limitations, it will not be possible to inspect for all the defects listed below. Notehowever, that the retract chain is very well protected from the environment and that itperforms much less work than the extend chain.10-5-1 CHAIN NOMENCLATURESee Figure 10-3 for a description of chain terms.Figure 10-3. Chain Nomenclature10-5-2 VISUALLY INSPECT CHAINEVERY 1,000 HOURS OFOPERATIONPerform the following procedure to inspect the boom extend chain:– TASK REQUIREMENTS –PersonnelTwo mechanicsSpecial tools and equipmentSafety glassesParts and consumable materials Danger tags (2)Service Manual Rev 01 – 05/10 10-8P/N 24933-000