CRANE LIFT CHECKLIST

The Crane Lift Checklist (fig. 12-43), outlined in the COMSECOND/COMTHIRDNCBINST 11200.1, must be filled out by the crane crew supervisor or the crane test director before the crane can proceed to any project or make any crane lift. After the Crane Lift Checklist is complete, the crane crew supervisor briefs the operator and rigger on specifics of the lift and travel conditions.

Crane Stability

Setting up for a crane lift is the most critical portion of the crane operation. The most common causes of crane mishaps are as follows:

Figure 12-43.-Crane Lift Checklist.

Figure 12-44.-Proper and improper cribbing.

Figure 12-45.-Crane capacity lost by crane out of level.

1. Failure to block/crib under the outrigger pads when poor ground conditions cannot support the total weight of the crane and load. Proper and improper cribbing is shown in figure 12-44.

2. Failure to extend the outriggers fully and use them following the manufacturer's instruction.

3. Failure to note overhead obstructions, such as overpasses and power lines.

4. Failure to level the crane. Leveling the crane cannot be overemphasized. Cranes must be set up as per manufacturer's instruction with the outriggers fully extended and the crane leveled. Crane capacity is lost when the crane is out of level by only a few degrees (fig. 12-45). Most cranes have levels mounted on them, but the levels are not always accurate. Use a 3-foot builders level to check the level of the crane over the rear and over the sides (fig. 12-46).