sheaves, worn or distorted sheave pins, broken bolts,and worn check weights (fig. 3-8).The hook is inspected for damage, excessivewear to the hook safety latch, hook swivel trunnions,thrust collar, and securing nut. Also, the hook isinspected for damage or missing lubrication fittings,proper lubrication, cracks and gouges, and if visiblybent or twisted.Before weight testing the crane, check thehook block certification. Every fifth certification, thehook block should be magna-fluxed and noted on thecertification document. The magna-fluxed procedureis normally performed by the Public Works Center.Part of the weight-testing procedure is todocument the before and after hook throat openingtram point measurement (fig. 3-9). The beforemeasurement is performed before the weight test ofthe crane.Sheave InspectionSheaves are located in the hook block, boompoint, boom bridle, gantry, and boom mast. Sheavesare installed basically anywhere wire rope must turnor bend. Sheaves rotate on either bearings orbushings that are inspected for discoloration (due toexcessive heat), metallic particles, chips or displacedFigure 3-9.-Hook throat measurement.metal, broken or distorted bearing retainer or seals,adequate lubrication, and tight bearing caps.The sheave inspection (fig. 3-10) is theinspection for wear and damage, wear in the wirerope sheave groove, loose or damaged sheave guards,and worn bearings and pins.Figure 3-8.—Hook and block inspection points.3-10
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