Section 4 – WORKING WITH CRANE Mini-Crawler Crane M A E D A
4-58 1/2019 MC405C-3
• If the wire rope is twisted and causes the hook
block to turn, fully eliminate the twist before
work.
For more information, see "Winch Wire Rope -
Correcting Twisted Rope" on page 5-67.
Cautions When Operating Boom
Fig. 4-143
• Be slow as much as possible when operating
the boom operation lever.
Especially avoid sudden lever operations when
the load is hoisted, which may cause the load
to waggle and give large impact to the
machine, and thus may damage the crane or
trip the machine.
• When the boom is lowered, the working radius
increases, and the rated total load that can be
hoisted decreases. When working while
raising/lowering the boom, pay extra attention
so that the mass (weight) of the load at the time
the boom is most lowered does not cause
overloading.
• Attempts to pull the load laterally or pull to bring
forth the load by raising/lowering and/or
extracting/retracting operation of the boom are
prohibited. Do not attempt under any
circumstance.
• Be aware of the hook block windup condition
and exercise caution when extending or
retracting the boom.
• When the boom is extended, the working radius
increases, and the rated total load that can be
hoisted decreases. When working with
extending/retracting the boom, pay extra
attention so that the mass (weight) of the load
at the time the boom is most lowered does not
cause overloading.
Cautions During Slewing Operation
Fig. 4-144
Fig. 4-145
• Check the safety in the vicinity and blow the
horn before slewing.
• If the boom operator angle is small, be careful
to prevent the boom from hitting the operator or
the machine.
• Be slow as much as possible when operating
the slewing lever. Make sure to start smoothly,
slew slow, and stop quietly.
Especially avoid sudden lever operations when
the load is hoisted, which may cause the load
to waggle and cause the machine to lose
balance, and thus may damage the crane or
trip the machine.
• Attempts to pull to bring forth the load or let the
load stand up by slewing operation are
prohibited. Do not attempt under any
circumstance.
• Be careful to prevent the wire rope and/or
hoisted load from contacting an obstacle such
as a tree or steel when hoisting a load or when
slewing.
If caught by an obstacle, do not forcibly wind up
the hoist load, but untangle the caught part
before winding up.
• Certain outrigger extension condition may
cause the boom to hit an outrigger and cause
the crane to be damaged or the machine to trip.
Be careful to prevent the boom from hitting
outriggers during slewing operation.
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