hoist control lever to provide slack in the boom hoist
lines to align the pendant lines. Once the pendants are
aligned, insert the pendant connection pins and cotter
5. Next, engage the boom hoist control lever to
raise the bridle assembly and pendants. Before doing
this, go back through and visually inspect all boom and
pendant line pin connections and cotter pins. Have
someone visually watch the boom hoist drum to ensure
the wire rope does not cross wind, causing the wire rope
to be crushed or kinked. Additionally, ensure all of the
boom hoist wire rope is properly running on all of the
sheaves. Once everything checks out, engage the boom
hoist control lever and raise the bridle assembly and
pendants until they are tight.
6. Visually check the boom suspension system before
raising the boom off the ground As the boom is being raised,
visually check the reeving of the boom hoist wire rope.
7. Once the boom is erected, check the hoist
wire rope reeving. You want to ensure the wire rope
is correctly flowing through the boom tip and hook
block sheaves and winding properly on the hoist drum.
Before the crane can be operated, as outlined in the
NMCB, Equipment Management, COMSECOND/
COMTHIRDNCBINST 11200.1, and before putting the
crane back in service, the crane test director must inspect
the crane for correct installation of all components and
verify the prior testing and mechanical condition of
added components. The crane certifying officer may
direct the crane to be load-tested at its safe load capacity
at minimum and maximum radius.
TELESCOPIC BOOM CRANES
Telescopic boom cranes are typically called
hydraulic cranes. The booms are composed of a series
of rectangular, trapezoidal, or other shape of
symmetrically cross-sectional segments, fitting into
each other. The largest segment, at the bottom of the
boom, is called the base section or boom butt. The
smallest section, at the top of the boom, is called the tip
section or boom tip. In between there can be one or
more sections called the first, second, and so forth,
sections. With the boom fully retracted, the telescopic
boom crane is highly maneuverable and easy to
transport to jobsites.
Telescopic boom crane
nomenclature is shown in figure 12-27.
Figure 12-27.Telescopic boom crane nomenclature.