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3.18.2 HIGH SPEED HOOK RAISING/LOWERING OPERATION
• Use the high-speed winching only in the no-load condition where a hoisted load is not present.
Raising/Lowering the hoisted load in the high-speed mode may cause machine damage or
serious accidents such as overturning of the machine or dropping of the load, resulting in
death or serious injury.
• In a condition where the actual weight of the load is "0.5 tons" or more, the high speed mode is
not available even when the winch speed selector switch is pushed to "Hi-speed " position (,
with it’s light ON). Where the actual weight of the load is "0.2 tons" or less, high-speed
winching operation is available, however, such a practice should be avoided as much as
possible and preclude machine damage or serious accidents such as overturning of the
machine or dropping of the load, resulting in death or serious injury.
• At the boom Derricking operation, the actual load indication in the moment limiter may make
insignificant changes due to pressure change in the derrick cylinder. In a condition where the actual
load indication in the moment limiter is "0.5 tons" or more, the high speed mode is not available even
when the winch speed selector switch is pushed to "Hi-speed " position (, with it‟s light ON).
• When the Fall mode of the moment limiter is set to 1-fall, the high speed mode is not available even
though the winch speed selector switch is pushed to "Hi-speed " position ( with it‟s light ON) it is fixed
to Low-speed.
Use the winch speed selector switch (3) in the switch box as
follows:
• High-speed: Push the switch button. The pilot lamp inside lights
and raising/lowering speed is accelerated.
• Low-speed: Push the switch button, again. The pilot lamp inside
goes off and raising/lowering speed returns to
normal mode.
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