sheaves, worn or distorted sheave pins, broken bolts,
and worn check weights (fig. 3-8).
The hook is inspected for damage, excessive
wear to the hook safety latch, hook swivel trunnions,
thrust collar, and securing nut. Also, the hook is
inspected for damage or missing lubrication fittings,
proper lubrication, cracks and gouges, and if visibly
bent or twisted.
Before weight testing the crane, check the
hook block certification. Every fifth certification, the
hook block should be magna-fluxed and noted on the
certification document. The magna-fluxed procedure
is normally performed by the Public Works Center.
Part of the weight-testing procedure is to
document the before and after hook throat opening
tram point measurement (fig. 3-9). The before
measurement is performed before the weight test of
Sheaves are located in the hook block, boom
point, boom bridle, gantry, and boom mast. Sheaves
are installed basically anywhere wire rope must turn
or bend. Sheaves rotate on either bearings or
bushings that are inspected for discoloration (due to
excessive heat), metallic particles, chips or displaced
Figure 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 the
inspection for wear and damage, wear in the wire
rope sheave groove, loose or damaged sheave guards,
and worn bearings and pins.
Figure 3-8.Hook and block inspection points.