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2.20 BOOM TELESCOPING OPERATION
• Operate the left 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.
• Do not pull the load horizontally or pull in the load by telescoping the boom.
• When the boom is extended, the working radius increases, and the rated total load that
can be hoisted decreases. When working while extending/retracting the boom, pay
extra attention so that the mass (weight) of the load at the time the boom is lowered
does not cause overloading.
• When the boom is extended, the hook block is wound.
If the over winding detector generates an alarm buzzer while the boom is extended,
immediately shift the left control lever into the “NEUTRAL” position to stop the boom
operation.
CAUTION
• The hook block is wound or unwound while the boom is extended/retracted. Perform
the winch operation at the same time to adjust the hook block height.
• When the boom is extended for a long time, the boom slightly retracts due to the
temperature change in the hydraulic oil. In this case, extend the boom as needed.
Operate the left control lever (2) as follows:
• Extending: Push the lever forward.
• Neutral: Release your hand from the lever.
The lever returns to the “NEUTRAL” position
and the boom telescoping stops.
• Retracting: Pull the lever backwards.
NOTES
Control the boom extension/retraction speed with the left
control lever and the stroke of the accelerator pedal.
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