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Boom & AttachmentsXR620/621/842/1045/1245/1254/1267/1534/2050/3034Figure 10-2. Boom Extend Chain Lubrication10-5 INSPECT BOOM CHAINSEVERY 1,000 HOURS OFOPERATIONChain failure can be caused by worn pins, cracked links, corrosion, worn linkplates, or chain elongation (stretching). Chain failure can result in:• Erratic, uncontrolled boom movement and loss of load.• Vehicle instability and tip over.• Death, serious injury, and/or property damage.The comprehensive chain inspection consists of the following tasks:• A thorough visual inspection.Service Manual Rev 01 – 05/10 10-7P/N 24933-000