Maeda CC423S-1, Руководство по эксплуатации

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3.15 BOOM TELESCOPING OPERATION
• Perform the left work equipment operation lever operation as slowly as possible.
Especially avoid sudden lever operations when the load is hoisted, which may cause the load
to waggle and give large impact to the Machine, and thus may damage the crane or trip the
Machine.
• Pulling of the load laterally by extending/retracting the boom is prohibited. Be sure to
perform the hook hoisting operation to lift a load.
• 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 most lowered does not
cause overloading.
• When the boom is extended, the hook block is raised.
If the warning buzzer of the over-hoisting prevention device sounds during the boom
extending operation, return the boom telescoping lever immediately to the neutral position
and stop the boom extending operation.
CAUTION
• When the boom is extended/retracted, the hook block is in a raised or lowered state. Always
perform the winch operation simultaneously 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 work equipment operation lever (2) as
follows.
• Extend: Push the lever forward.
• Neutral: Release your hand from the lever.
The lever returns to the neutral position and the
boom extension/retraction stops.
• Retract: Pull the lever toward you.
NOTES
• Adjust the boom extending/retracting speed by the
stroke of the left work equipment operation lever (2) and
depression amount of the accelerator pedal (4).
• When the boom extends, the second stage extends
first, then the third and fourth stages extend
simultaneously.
When the boom retracts, it retracts in the reverse order
of extension.
CAUTION
When the boom extends and the hook block (3)
pushes up the weight (5) of the over-hoist detector
(6), the boom extension stops. In this state, the boom
does not extend when the boom extending operation
is performed.
In such a case, lower the hook block by performing
the retracting operation or the lowering operation of
the boom.