Battalion, Equipment Management, rated free loads orpick and carry operations will only be performedaccording to NAVFAC P-307 during a cranecertification, in case of an emergency, or as directed bythe crane certifying officer.Depending on the make and model, mosttruck-mounted cranes have a 270-degree working area.Some truck-mounted cranes are equipped with an optionalfront outrigger that provides a 360- degree working areaThe quadrants of operation for truck-mounted crones areover the side, over the rear, and over the front if equippedwith the front outrigger (fig. 12-8).NOTE: The capacity of the crane may changewhen rotating a load from one quadrant to another. Thisinformation is provided on the crane load chart.Wheel-Mounted CranesWheel-mounted cranes range in various sizesand have capacities from 5 to 35 tons or larger (fig.12-9).The wheel-mounted cranes shown in figure 12-9are hydraulically operated, four-wheel drive,four-wheel steer, pneumatic-tired, engine-powereddiesel. The superstructure consists of a telescopingboom, single-acting hydraulic lift cylinders, ahydraulically operated hoist drum, and a hook blockattachment.The wheel-mounted crane has a ground bearingpressure of about 35 psi and can travel at speeds rangingfrom 2 to 30 mph. It can turn in a 30-foot radius withtwo-wheel steering and in a 17-foot radius withfour-wheel steering and can travel up a firm, dry40-percent grade.The wheel-mounted crane is a mobile andflexible crane that can be driven on or off roadsover rough terrain. It is best suited for lifts aroundshops or for supporting fabrication projects thatcall for many varied, mobile lifts within a smallworking area.Depending on the make and model, mostwheel-mounted cranes have a 360-degree work areaThe quadrants of operation for wheel-mounted cranesare over the side, over the rear, and over the front (fig.12-10). Remember that the capacity of the crane mayFigure 12-9.—Wheel-mounted cranes.Figure 12-10.—Wheel-mounted crane quadrants of operation.12-5
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