winch operation of a hoisted load at high speed may cause serious physical injury due to
machine tipping and breakage or dropping of a load.
• If a load of hoisted load is "0.5t" or more, the speed does not become high even when the
winch 2 speed selector switch is turned to the "High speed". If a load of hoisted load is
"0.2t" or less, it is possible to perform the winch operation at high, but such operation
may cause serious physical injury due to machine tipping and breakage or dropping of a
load. Therefore, avoid such operation as much as possible.
• When the boom is raised or lowered, the numerical value of an actual load of the moment limiter
changes slightly due to a change of pressure of the derrick cylinder. If the numerical value of an
actual load of the moment limiter is "0.5t" or more, the speed does not become high even when
the winch 2 speed selector switch is turned to the "High speed".
• When "One fall" is selected for the number of wire falls of the moment limiter, the speed does
not become high even when the winch 2 speed selector switch is turned to the "High speed" (the
lamp of the switch part turns on).The speed is fixed to low speed.
Operate the winch 2 speed selector switch of the left work
equipment operation lever.
• High speed: Press the switch. (2) is displayed on the winch
speed display of the monitor. Raising and
lowering speed is increased.
• Low speed: Press the switch again. (1) is displayed on the
winch speed display of the monitor. The speed
returns to the normal raising and lowering
speed.
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