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2.4 CAUTIONS DURING CRANE OPERATION
INSPECTION BEFORE STARTING WORK
Check that the safety devices and crane operate properly.
• Operate each of the operation levers, pedals and switches under no load, and check that
operations take place without any abnormality.
Repair immediately if any abnormality exists.
• Check such safety devices as moment limiter (overload prevention device), over winding
prevention device and over-unwinding prevention device to ensure that they function
normally.
CAUTIONS WHEN SETTING MOMENT LIMITER
• In the moment limiter, the moment is calculated on the assumption that the machine is
placed horizontally.
If crane work is performed without the machine being placed horizontally, no forecast or
warning is issued even when the rated total load is approached.
Never fail to check the inclination of the Machine by using the level on monitor.
• When using the moment limiter, check to ensure that the indicators of boom angle, boom
length and actual load are interlocked with the crane motion to give correct values. If the
crane is used with no correct indication given, correct measurement results cannot be
obtained, causing serious physical injury due to tumbling or damage of the machine.
• When using the moment limiter, be sure to check that the setting of wire falls of the moment
limiter matches the wire falls of the crane. If the number of falls does not match each other,
either alter the setting of wire fall count moment limiter or alter that of crane so that the count
matches each other. Using the moment limiter without matching its number of falls may
cause the breakage of wire rope, resulting in a serious bodily accident.
• Do not change the setting carelessly during measurement with the moment limiter.
Otherwise, correct measurement results cannot be obtained, causing serious physical injury
due to tumbling or damage of the machine.
CAUTIONS FOR SELECTING A PLACE TO INSTALL
Always place the Machine on a level, stable and solid ground.
It is dangerous to install on any of the following places:
• Simple asphalt pavement
• Thin concrete pavement
• Flagstone pavement
• Areas where under the pavement surface is hollow due to water erosion and the top soil
appears to be hard but soft in the ground
• Soft ground near a road shoulder or dug hole
• Slope
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