M A E D A Crawler Crane OPERATION
6/2020 CC1908S-1 Quick operation guide 17
[BOOM TELESCOPING]
WARNING
・Operate the left-hand control lever as
slowly as possible.
Especially avoid sudden lever operations
when a load is hoisted, which may cause
the load to sway and hit the machine,
damaging the crane or causing the machine
to topple.
・Pulling a load laterally or drawing it in by
extending or retracting the boom is
prohibited. Be sure to use hook hoisting to
lift loads.
・Extending the boom increases the working
radius and reduces the rated total load that
can be hoisted. When extending or
retracting the boom, pay extra attention so
that the weight of the load with the boom
fully extended does not cause overloading.
・The hook block will be raised while the
boom is being extended.
If the warning buzzer of the overwinding
detector sounds while extending the boom,
return the boom telescoping lever
immediately to the neutral position and
stop extending the boom.
IMPORTANT
・The hook block will be raised or lowered
while the boom is being extended or
retracted. Always use the winch operation
simultaneously to adjust the hook block
height.
・When the boom is extended for a long time,
the boom retracts slightly due to the
temperature change in the hydraulic oil. If
this occurs, extend the boom as necessary.
Operate the left-hand control lever (1) 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 toward you.
Adjust the boom extending/retracting speed
by varying the stroke of the left-hand control
lever (1) and the depression of the
accelerator pedal (2).
When the boom extends, the second stage
extends first, then the third stage and finally
the fourth and fifth stages extend
simultaneously.
When the boom retracts, it retracts in the
reverse order of extension.
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