Section 4 – CRANE OPERATION Mini-Crawler Crane M A E D A
4-54 3/2019 MC305C-3
65B64BCrane 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 4-52.
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. 4-147
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 hoisted and not touching the ground.
Fig. 4-148
Fig. 4-149
66B65BHook 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, the
over hoisting 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 cable on
the winch drum.
CAUTION: Do not let the hook block touch the
ground.
The winch drum will wind irregularly,
damaging the wire cable.
Operate the winch lever (3) as follows;
Fig. 4-150
• 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.
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