2-21
CAPACITY EXAMPLES FOR BOOM EXTENSION
The BOOM EXTENSION LOAD RADIUS and BOOM EXTENSION ANGLE capacity charts
must both be considered when using the boom extension. The smaller capacity specified by
the two charts must be used. Refer to the Capacity Chart on page 2-14 for the following
examples:
In this first example the boom is elevated to 30° over the side of the crane. The boom
extension is offset to 15°, and the load radius is 34 feet (10.0m) . The outriggers are fully
extended on concrete pavement and the crane is level. The column for 360° ROTATION,
OUTRIGGERS OUT & DOWN shows the capacity at the 34-foot (10.0m) load radius to be
7000 pounds (3300kg). The column for BOOM EXTENSION, MAIN BOOM ANGLE 30°
shows the capacity for the 15° boom extension angle to be 2600 pounds (1180kg). Since
2600 pounds (1180kg) is less than 7000 pounds (3300kg), the load (including the downhaul
weight and slings) must be limited to 2600 pounds (1180kg).
In the second example the boom is elevated to 40° over the side of the crane. The boom
extension is offset to 0°, and the load radius is 38 feet (12.0m). The outrigger beams are
retracted and the jacks are fully extended on concrete pavement and the crane is level. The
column for 360° ROTATION, OUTRIGGERS IN & DOWN shows the capacity at the 38-foot
(12.0m) load radius to be 1750 pounds (710kg). The column for BOOM EXTENSION -
STRAIGHT OR OFFSET, MAIN BOOM ANGLE 40° shows the capacity at the 0° boom
extension angle to be 3400 pounds (1540kg). Since 1750 pounds (710kg) is less than 3400
pounds (1540kg), the load must be limited to 1750 pounds (710kg).
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