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Boom & AttachmentsXR620/621/842/1045/1245/1254/1267/1534/2050/303410-5-4 MEASURE CHAIN ELONGATIONEVERY 1,000 HOURS OFOPERATIONPerform the following procedure to measure chain elongation:PersonnelSpecial tools and equipment– TASK REQUIREMENTS –One mechanicSafety glassesTape measureParts and consumable materials Danger tags (2)NOTE: A chain that is elongated beyond the 7/16-inch limit requires that the entire chainbe replaced.NOTE: Because of boom construction, access to the retract chain is very limited. Thechain elongation measurement can only be performed when the boom has beencompletely disassembled. Note however, that the retract chain is very well protected fromthe environment and that it performs much less work than the extend chain.INITIAL SET-UP1. Park forklift on level surface.2. Set Travel Select lever to NEUTRAL (N).3. Set Parking Brake switch to ON.4. Raise boom to horizontal (level) position.5. Fully extend boom until extend chain is taut.6. Set Ignition switch to OFF.7. Attach danger tags to steering wheel and ignition key. Refer to para. 2-5, for lockout-tagoutprocedure.CHAIN ELONGATION MEASUREMENT1. See Figure 10-6. The length of a chain sample that contains 13 pins, from a new chain, is 15" fromthe center of the far left pin to the center of the far right pin. The maximum allowable elongation limitis 7/16-inch for a chain in operation.2. Select chain section for measurement that runs over chain sheave during normal operation. Chainlinks that run over chain sheaves are most likely to experience elongation.3. Measure length of chain sample with tape measure. If the sample length is 15-7/16" or more, theentire chain must be replaced.Service Manual Rev 01 – 05/10 10-13P/N 24933-000