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2.18 HOOK RAISING/LOWERING OPERATION
• 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 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;
• 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.
NOTES
Adjust the winch raising/lowering speed with the winch lever and
stroke of the acceleration pedal.
2.19 BOOM DERRICKING OPERATION
• Operate the boom derricking lever as slowly as possible.
Sudden lever operation especially while hoisting a load will cause the load to swing, giving a
great impact to the machine, and thus may break the crane or overturn the machine.
• Lowering the boom increases the working radius and the rated total load that can be hoisted
decreases. Be extremely careful so that the load weight will not be overloaded with the boom
most lowered when working by derricking the boom.
Operate the boom derricking lever (4) as follows.
• Lower: Push the lever forward to the “LOWER” side.
• Neutral: Release your hand from the lever.
The lever goes back to the “NEUTRAL” position and the
boom derricking stops.
• Raise: Pull the lever toward you to the “RAISE” side.
NOTES
Adjust the boom derricking speed with the boom derricking lever
and the stroke of the acceleration pedal.
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