Battalion, Equipment Management, rated free loads or
pick and carry operations will only be performed
according to NAVFAC P-307 during a crane
certification, in case of an emergency, or as directed by
the crane certifying officer.
Depending on the make and model, most
truck-mounted cranes have a 270-degree working area.
Some truck-mounted cranes are equipped with an optional
front outrigger that provides a 360- degree working area
The quadrants of operation for truck-mounted crones are
over the side, over the rear, and over the front if equipped
with the front outrigger (fig. 12-8).
NOTE: The capacity of the crane may change
when rotating a load from one quadrant to another. This
information is provided on the crane load chart.
Wheel-Mounted Cranes
Wheel-mounted cranes range in various sizes
and have capacities from 5 to 35 tons or larger (fig.
12-9).
The wheel-mounted cranes shown in figure 12-9
are hydraulically operated, four-wheel drive,
four-wheel steer, pneumatic-tired, engine-powered
diesel. The superstructure consists of a telescoping
boom, single-acting hydraulic lift cylinders, a
hydraulically operated hoist drum, and a hook block
attachment.
The wheel-mounted crane has a ground bearing
pressure of about 35 psi and can travel at speeds ranging
from 2 to 30 mph. It can turn in a 30-foot radius with
two-wheel steering and in a 17-foot radius with
four-wheel steering and can travel up a firm, dry
40-percent grade.
The wheel-mounted crane is a mobile and
flexible crane that can be driven on or off roads
over rough terrain. It is best suited for lifts around
shops or for supporting fabrication projects that
call for many varied, mobile lifts within a small
working area.
Depending on the make and model, most
wheel-mounted cranes have a 360-degree work area
The quadrants of operation for wheel-mounted cranes
are over the side, over the rear, and over the front (fig.
12-10). Remember that the capacity of the crane may
Figure 12-9.Wheel-mounted cranes.
Figure 12-10.Wheel-mounted crane quadrants of operation.
12-5