Section 4 – WORKING WITH CRANE Mini-Crawler Crane M A E D A
4-56 1/2019 MC405C-3
Cautions When Slinging
• Check the following before hoisting a load.
Attempt to hoist the load without checking may
result in serious bodily accidents by a drop of
the load or tripping.
• Observe the values in the rated total load
chart.
• Hoist from the centre of gravity of the load.
• Check that the wire ropes of the hook block
are perpendicular to the ground.
• When the load leaves the ground, stop
winding up the load once and check whether
the load is stable.
• Before hoisting a slung load, always check
whether the sling wire rope "retainer device" of
the hook block is hung for sure. If the "retainer
device" is not hung, the wire rope may leave
the hook block and cause the load to fall and
results in a serious accident.
• Larger wire rope angle when hoisting the load
increases force that applies to the wire rope
even when the load weight is unchanged, thus
may cause the wire rope to snip. Pay enough
consideration well when slinging to prevent
excessive for from applying to the wire rope.
• Do not hoist more than loads at once.
Such attempt may cause the hoist bracket to hit
and damager the other hoisted load, the loads
to move and loose balance and cause trip, or
other cause of serious accidents.
Do not hoist more than one load even if the
total is within the rated total load.
• Hoisting of lengthy load causes the load to lose
balance and is dangerous.
• In case such load, hoist vertically by using a
cramp, or achieve balance of the hoisted load
by applying a rope to both ends of the load.
Cautions When Working with Crane
• Be sure to verify that the moment limiter
override switch is at OFF position before
operating the crane.
Do not attempt the crane operation when the
moment limiter override switch is at ON
position. The moment limiter override switch is
permitted to be at ON position only during the
inspection or maintenance works.
• Crane works are not possible when the
outriggers are placed in extension condition.
Also, the crane work becomes halted when an
outrigger support leaves the ground during the
crane work. Securely place the crane in the
extension condition, and avoid operations and
works that may cause the machine to vibrate
when working with the crane.
• Attempt to work beyond the capacity of the
machine may cause serious accidents and
failures caused by for instance tripping or
fluctuation. Observe the rated total load chart
when working with the crane.
• Do not travel with a load being hoisted under
any circumstance.
Such attempt may cause the crane to trip and
may result in serious bodily accidents.
• Be slow when operating the crane.
Sudden lever or accelerator operations may
cause risks such as waggling or fall of the load
and collision with the surrounding. Be
especially careful to be slow during the slewing
operations.
• Do not let people approach the work radius or
below the load, since risks such as fall of the
load and contact with the load exist. Such
attempt may result in serious bodily accidents.
Also, during the work, consider the fact that the
working radius increases when the load is
hoisted and the boom is deflected thus.
• Attempt to work with the crane even when the
view is bad due to location or weather is
dangerous.
Ensure brightness by posting a work lamp or
other illumination facility in dark places.
When the view is bad because of bad weather
(rain, fog, and snow), abort working and wait
until the weather recovers.
• Do not use for purpose, for instance raising a
person using a crane, other than the true
purpose.
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