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Lattice  Boom  Breakdown
Lattice Boom Breakdown, Continued

Equipment Operator Basic - Beginning construction equipment operators manual
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have gloves, hardhats, safety glasses or goggles, and safety  shoes  for  all  hands,  sledge  hammers,  pliers, crowbars, marlin spikes, extra cotter pins, and dunnage. WARNING Always wear gloves when handling wire rope. NOTE: When breaking down a lattice boom, take the  opportunity  this  provides  to  inspect  items thoroughly, such as the connecting pins, cotter keys, and  inside  the  connecting  lugs  for  wear,  rust,  and surface cracks. A  common  method  used  to  break  down  a  pin- connected basic boom and add a section is as follows: 1. Set outriggers and swing the upper revolving unit over the rear or side, depending on the make and model of the crane. 2.  Lower  the  hook  block(s)  to  the  ground  and provide slack in the hoist line(s). Next, lower the boom and set the boom tip sheaves on a piece of dunnage. 3. Engage the boom hoist control lever to lower the bridle assembly or boom mast to slacken the pendant lines. 4. To prevent the pendant lines from falling on the ground, use tie wire or rope to secure the pendant lines to the boom. Then remove the cotter pins and drive out the main pins from the bridle assembly connections in the pendant lines. 5. Position the bridle assembly on top of the boom butt (fig. 12-26, view A). This is done by having the operator engage the boom hoist control lever to tighten the boom hoist lines until the bridle is positioned on top of  the  boom  butt.  To  align  the  pinholes,  manually position the bridle assembly using the crowbar. The pins that are used for the pendant line connections are Figure 12-26.-Boom hoist assembly connected to boom butt. 12-13







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