TM 5-3810-307-10
5-7.8
Lowering the Boom.
WARNING
Before lowering the boom, make certain the area
beneath the boom is clear of all obstructions and
personnel.
Long cantilever booms can create a tipping condition
even when unloaded and in an extended and
lowered position.
When lowering the boom, lower the hoist rope at the
same time to prevent two-blocking the boom nose
and the hook block.
CAUTION
The closer the load is carried to the boom nose, the
more important it becomes to let out hoist rope as the
boom is lowered.
a.
To lower boom, push Boom LIFT/MAIN HOIST Control Lever (8, Figure 5-2)
to the right and hold until boom is lowered to desired position.
b.
To stop boom, return Boom LIFT/MAIN HOIST Control Lever (8) to its
neutral position.
Extending the Boom.
WARNING
When extending the boom, let out wire rope
simultaneously to prevent two-blocking the boom
nose and hook block.
WARNING
Check the load chart for maximum load at given
radius, boom angle, and length before extending
boom with a load.
a.
Place TELE/CLAMSHELL Selector Switch (10, Figure 5-2) to TELE.
b.
To extend boom, push top pad of Telescope/Clamshell Control Pedal (21)
forward (away from the operator) and hold until the boom extends to desired
length.
c.
To stop boom extension, depress bottom pad on telescope control pedal to
return Telescope/Clamshell Control Pedal (21) to its neutral position.
5-85
