Zoomlion ZCC1100H, Operator'S Manual

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Operator’s Manual for Crawler Crane
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4-54
4.5.7.4 Operation of swing free running
If a load hook is not positioned vertically over the load’s center of gravity before lifting operation,
the operator can operate left control lever and press the “Swing free running” button on the
control lever at the same time. At this moment, the boom will enforce the slewing table, under
the influence of side force of wire rope, to rotate toward the direction of load’s center of gravity
till the hoisting wire rope is vertical. In this way, the boom can be protected against damage due
to side force. When the wire rope is vertical, please release the button. The “Swing free
running” button is shown in the following figure.
Figure 4-47 Operation of swing free running
CAUTION
(1) When carrying out the movement “Swing free running”, operate control lever to lift
the hook at the same time. In this way, a side force will be produced on the wire rope
to make load hook vertical to boom.
(2) Ensure that there are no obstacles in the crane slewing area and no person is in the
danger zone before slewing operation. Give out a short warning signal (horn) before
starting a crane movement.
(3) Avoid stopping slewing movement or changing slewing direction jerkily. Do not
swing the lifted load.
(4) Longer boom - slower slewing speed.
(5) Heavier load - slower slewing speed.
(6) It is not permitted to slew the superstructure on the trailer.
“
Swing free running
”
button
Left control lever