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3.15 CAUTIONS BEFORE CRANE OPERATION
Not observing these cautions before operation may result in serious accidents.
• Always go for a level ground to station the machine for crane
operations. Once the machine is stationed, check the level to
secure the machine status. The moment limiter computes
moment subject to the machine being correctly leveled.
Otherwise, it would not provide a pre-warning or warning when
the operation comes into pre-warning zone. All operation must be
carried out in a level condition.
• Set the moment limiter correctly to the crane operation. The moment limiter computes moment based on
the setting. Unless the setting represents the actual condition, breakage of the wire ropes or boom
damage may be caused, which may result in serious injury.
Example:
• Actual number of the wire rope falls: 2
• The fall mode switch setting in the moment limiter: 4
In such a condition as above, the moment limiter computes the
load using the value of "4 wire falls", thus even though the actual
load reaches pre-warning zone, no pre-warning or warning is
provided.
Consequently, when the rated total load exceeds the allowance
of the "2 wire falls", the wire rope may break.
• When you over hoist the hook, the over hoist detector actuates to
sound the buzzer and stop hook raising. When the warning
buzzer sounds, immediately release the right work equipment
control lever and return it to the neutral position to stop hook
raising.
Next, operate the right work equipment control lever to HOOK
LOWERING position (push forward) so that the hook block is
lowered.
• When you extend the boom too much, the hook block is also
hoisted, thus the over hoist detector actuates to sound the buzzer
and stop extending. When the warning buzzer sounds,
immediately release the left work equipment control lever and
return it to the neutral position to stop extending the boom.
Next, operate the left work equipment control lever to BOOM
RETRACTING position (pull back) so that the boom is shortened.
• Use the horn switch and toot the horn to warn danger to persons
nearby, when necessary, during crane operations.
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