Maeda MC405C-3 - Crane Operation Posture; Hook Raising;Lowering Operation

Mini-Crawler Crane M A E D A Section 4 – CRANE OPERATION
1/2019 MC405C-3 4-63
Crane Operation Posture
Take the crane operation posture by following the
procedure below when switching to the operation
from the state described in "Before Crane
Operations" on page 4-62.
1. Operate the winch lever (3) to the "DOWN"
(push forward) side and lower the hook but
not to let the hook block touch the ground.
Fig. 4-160
2. Operate the boom derricking lever (4) to the
"RAISE" (pull toward you) side and raise the
boom to the angle where the hook block is not
over wound and not touching the ground.
Fig. 4-161
Fig. 4-162
Hook Raising/Lowering Operation
WARNING!
• With the boom deflection, the hoisted load
slightly shifts forward. Notify the workers
around such as slinging operators.
• If the hook block was hoisted too much, over
winding will be detected. The alarm buzzer
sounds and the audible message saying
"Hook over hoisted" will be heard. When the
alarm buzzer and audible voice were heard,
operate the winch lever immediately to the
"Neutral" position and stop raising the hook.
• When lowering the hook for long distance
for underground works, be sure to leave
more than three turns of the wire rope on the
winch drum.
CAUTION: Do not let the hook block touch the
ground.
The winch drum will wind irregularly,
damaging the wire rope.
Operate the winch lever (3) as follows;
Fig. 4-163
• Lower: Push the lever forward "DOWN".
• Neutral: Release your hand from the lever.
The lever will return to the "Neutral"
position and the raising/lowering of the
hook block stops.
• Raise: Pull the lever to the "UP" side toward
you.
NOTICE: Adjust the winch raising/lowering speed
with the winch lever and stroke of the acceleration
pedal.