Mini-Crawler Crane M A E D A Section 4 – WORKING WITH CRANE
1/2019 MC405C-3 4-53
WORKING WITH 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 that
operations take place without abnormality.
Repair immediately if any abnormality exists.
• Check that the safety devices such as the
moment limiter, outrigger safety device, and
over winding detector / automatic stop 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
above 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 act 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 act may damage 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.
Attempt to use without correct display results in
failure to obtain correct measurement result
and may result in serious bodily accidents
caused by reasons such as an 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.
Attempt to use with unmatched wire strands
results in failure to obtain correct measurement
result and may result in serious bodily
accidents caused by reasons such as an
improper operation and/or breakage of nearby
equipment.
• Do not carelessly change the setting when
measuring with the moment limiter. Such
attempt results in failure to obtain correct
measurement result and may result in serious
bodily accidents caused by reasons such as an
improper operation and/or breakage of nearby
equipment.
Cautions High Temperature Oil When
Working With Crane
Fig. 4-138
When hydraulic oil temperature exceeds 80°C,
high pressure hoses and seals can be damaged
by heat, and it may cause burn by spouted oil.
If temperature of hydraulic oil becomes over
80°C, stop operation and wait until the oil cools
down.
Continuous hook raising / lowering operation at
high working lifting height and a long time
accelerated operation are easier to raise oil
temperature. Especially be careful for these
operations.
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