M A E D A Crawler Crane 5.4 CRANE OPERATION
5/2020 CC1908S-1 5-33
Adjust the boom derricking speed by varying
the stroke of the right-hand control lever (1)
and the depression of the accelerator pedal
(2).
When the boom length display on the
moment limiter display is "6.0 m" or longer,
lowering stops automatically to prevent the
boom angle falling below a horizontal
position.
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.
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