Broderson IC-400-3B, Operation And Maintenance Manual

Page: 41 / 102

2-203
CAPACITY EXAMPLES FOR BOOM EXTENSION
The boom extension may lift loads in any swing position when the outriggers are OUT &
DOWN. The boom extension may lift loads over the front on IN & DOWN outriggers. The
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. Radii below the double lines on the capacity chart require an installed boom
extension to reach them. Refer to the capacity chart on page 2-20 for the following
examples:
EXAMPLE #1
: The boom is elevated over the side of the crane. The boom extension is
offset to 15°, and the load radius is 44 feet (13 m). The outrigger beams and jacks are fully
extended on concrete pavement and the crane is level. The column for OUT & DOWN, 360°
ROTATION, or OVER FRONT shows the capacity is at the 44-foot (13-m) load radius to be
8050 pounds (3650 kg). The column for BOOM EXTENSION, MAIN BOOM ANGLE 50°
shows the capacity for the 15° boom extension offset to be 2900 pounds (1300 kg). Since
2900 pounds (1300 kg) is less than 8050 pounds (3650 kg), the load (including the
downhaul weight and slings) must be limited to 2900 pounds (1300 kg).
EXAMPLE #2
: The boom is elevated to 15° over the side of the crane. The boom
extension is offset to 0°, and the load radius is 88 feet (26.8 m). The boom is fully
extended.The outrigger beams and jacks are fully extended on concrete pavement and the
crane is level. The column for OUT & DOWN, 360° ROTATION, or OVER FRONT shows
the capacity at the 88-foot (26.8 m) load radius to be 2000 pounds (910 kg). The column for
BOOM EXTENSION, MAIN BOOM ANGLE 15° shows the capacity at the 0° boom
extension offset to be 2750 pounds (1200 kg). Since 2000 pounds (910 kg) is less than
2750 pounds (1200 kg), the load must be limited to 2000 pounds (910 kg).