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2.18 WINDING AND UNWINDING
• With the boom deflection, the hoisted load slightly shifts forward. Notify the workers
around such as slinging operators.
• If the hook block is wound excessively, over-winding is detected, and an alarm buzzer
sounds. In such a case, immediately shift the right control lever (1) into the
“NEUTRAL” position to stop winding the wire rope.
• When it is necessary to unwind a significant length of the wire rope to lower the hook
in works such as underground works, at least 3 turns of the wire rope must be left 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 right operation lever (1) as follows:
• Unwinding: Push the lever forward.
• Neutral: Release your hand from the lever.
The lever will return to the “NEUTRAL”
position and the winding/unwinding of the
hook block stops.
• Winding: Pull the lever backwards.
NOTES
Control the winding/unwinding speed of the winch drum
with the right control lever and the stroke of the
accelerator pedal.
2.19 BOOM DERRICKING OPERATION
• Operate the right control lever as slowly as possible.
Especially avoid sudden lever operations when the load is hoisted, which may cause
the load to waggle and give a large impact to the Machine, and thus may damage the
crane or trip the Machine.
• When the boom is lowered, the working radius increases, and the rated total load that
can be hoisted decreases. When operating the machine by derricking the boom,
exercise caution so that the mass (weight) of the suspended load is not overloaded
when the boom reaches the lowest position.
Operate the right operation lever (1) as follows:
• Lowering: Push the lever forward.
• Neutral: Release your hand from the lever.
The lever returns to the “NEUTRAL” position and
the boom derricking stops.
• Raising: Pull the lever backwards.
NOTES
Control the derricking speed with the right control lever
and the stroke of the accelerator pedal.
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