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Boom & AttachmentsXR620/621/842/1045/1245/1254/1267/1534/2050/3034NOTE: Because of boom construction, access to the retract chain is very limited. Thechain edge wear 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.MEASURE CHAIN EDGE WEAR1. See Figure 10-5. The height of all link plates in a new chain is 1.185" from the top edge to the bottomedge. The maximum allowable wear limit is 5% (0.059") for chains in operation.2. Select chain link for measurement that runs over chain sheave during normal operation. Chain linksthat run over chain sheaves are most likely to experience wear.3. Measure height of link plate with caliper. If link plate height is 1.126" or less, the entire chain must bereplaced.Figure 10-5. Chain Edge Wear MeasurementService Manual Rev 01 – 05/10 10-12P/N 24933-000