Section 4 – FLY-JIB MOMENT LIMITER CONTROL Mini-Crawler Crane M A E D A
4-170 1/2019 MC405C-3
Restriction for Boom Stowing Operation
In fly-jib mode, though crane operation is not
available when main-boom angle is less than
55°, boom can be lowered for the purpose of
stowing boom when the boom length is 12.5m or
less (; two stages of main boom are fully
extended in maximum).
Fig. 4-506
Moment limiter display (Rated load display (12))
is "E-J" as it indicates in case of boom angle
lower limit range.
In addition, red light of working status lamp will
light and rotate.
In such condition, when the main-boom is
retracted to 12.5m or less, boom can be lowered
without the beeping of the warning buzzer.
However, moment limiter only indicates "E-J" and
Actual load display (11) is not available.
Except that Boom length display (3) indicates
"JIb", moment limiter only displays "E-J" in Boom
angle display (1) and Rated load display (12), as
it indicates in case of boom angle lower limit
range.
Fig. 4-507
DANGER! For stowing fly-jib, main-boom
could be lowered to the angle less than 55°
and extended under the condition that boom
length is less than 12.5m. However, such a
condition is very dangerous because Rated
load display (12) or Actual load display (11)
do not work. Never lift load under such
condition, otherwise critical accident of
damage to fly-jib shall result.
Instruction for Fly-Jib Operation
DANGER!
• For safety, always turn the operation mode
of moment limiter to fly-jib operation, prior
to starting its operation. Operation in
improper mode may cause a serious
accidents such as tipping.
• Pick and carry by fly-jib is strictly prohibited
since it will result in a serious hazard such
as tipping or machine damage.
Moment Limiter Mode Change
1. Turn work selector switch to crane mode.
Fig. 4-508
2. Push Fall mode selector switch (1) for 2
seconds or more. Operation mode will
change as shown below. Keep in mind that
the switch should be released and re-pushed
to proceed to next mode.
Fig. 4-509
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