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Clam Shell
Figure  12-33.Dragline  fairlead.

Equipment Operator Basic - Beginning construction equipment operators manual
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bolted around the hinge. The two hoist drum wire ropes on the crane are rigged as the holding and closing lines for controlling of the bucket. An example of a clamshell rigging configuration is shown in figure 12-30. The tag line winder (fig. 12-31) controls the tension on the tag line that helps prevent the clamshell from twisting during operations. Like the clamshell bucket, the tag line winder will exchange with most makes or models of cranes in the same-size range. DRAGLINE The dragline component (fig. 12-32) consists of a dragline  bucket  and  fairlead  assembly.  The  wire  rope components of the dragline are the drag cable, the bucket hoist, and the dump. Once a crane is rigged with a dragline, the crane is referred to by the name of the attachment, When you are loading the bucket, the fairlead (fig. 12-33) guides the drag cable onto the hoist drum. The hoist wire rope, which is reeved through the boom point sheaves, raises and lowers the bucket. WARNING On some model of cranes, you must make sure the fairlead is in a vertical position when lowering  the  boom  to  avoid  bending  the  cords of the boom base. Figure 12-31.—Tag line winder. When changing attachments from hook block or clamshell to dragline, check the operator’s manual for the lengths and diameter size of wire rope required for dragline  operations.  The  pulling  force  of  the  dragline Figure 12-30.-Clamshell rigging configuration. 12-18







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