Maeda MC-174CRM, Operation Manual

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2-12
2.3 WORKING WITH THE CRANE
INSPECTION BEFORE STARTING WORK
Check that the safety devices and crane operate properly.
•
Operate each of the operation levers and switches under no load, and check operations are performed
normally.
Repair immediately if any abnormality exists.
• Check that the safety devices such as the moment limiter, and over hoist detector device activate
properly.
CAUTIONS WHEN HANDLING MOMENT LIMITER
• Use/store the moment limiter under the following ranges of ambient temperature.
Temperature of use: 10 to 50 °C Storage temperature: -20 to 60 °C
• Avoid direct sunlight so that the temperature of the moment limiter body does not exceed the range.
• Avoid locations with strong acid or alkaline atmosphere as much as possible. Otherwise, unexpected
failures may occur.
• Do not apply impact to the moment limiter body for instance by colliding with an object.
Such attempt may damage the case and may result in failures and improper operations.
• Do not push the panel sheet of the moment limiter body by a force more than necessary or push with
sharp object such as a tip of a screwdriver. Such action may damage the panel sheet and may result in
failures and improper operations.
• Do not remove the case cover or panel sheet from, or disassemble the moment limiter body. Such
action may damage the case and/or panel sheet and may result in failures and improper operations.
CAUTIONS WHEN SETTING UP MOMENT LIMITER
• The moment limiter calculates the moments assuming the Machine is level.
If you work with the crane when the Machine is not level, warnings and alarms are not issued even
when the rated total load is near.
Always set the outrigger horizontally to the ground while looking at the level gauge.
• Before using the crane, check that the boom angle display, boom length display and real load display
of the moment limiter are displayed correctly following the crane movements. Attempting to use without
the correct display results in failure to obtain correct measurement result and may result in serious
bodily accidents caused by improper operation and/or breakage of nearby equipment.
• Always make sure the wire strand setting of the moment limiter matches with the wire strand of the
crane. If the wire strands do not match, always let the wire strands match by changing the wire strand
setting of the moment limiter or by changing the wire strand of the crane. Attempting to use with
unmatched wire strands results in failure to obtain correct measurement result and may result in
serious bodily accidents caused by improper operation and/or breakage of nearby equipment.
• Do not carelessly change the setting when measuring with the moment limiter. Such action results in
failure to obtain correct measurement result and may result in serious bodily accidents caused by
improper operation and/or breakage of nearby equipment.
PLACE CRANE ON LEVEL AND HARD GROUND
• Always place the outriggers on a level, stable and solid ground.
Attempt to work with crane without outriggers firmly contacting the
ground may cause the Machine to trip.
• Always place all outriggers before working with crane.
• Do not set any outrigger near the location that may collapse, for
instance, soft ground, roadside or drilled hole.
In case the outriggers need to be placed on soft ground for an
unavoidable reason, always reinforce the ground by laying a
sufficiently large and strong base plate below each of the outrigger
supports.