Section 4 – OUTRIGGER SETTING Mini-Crawler Crane M A E D A
4-38 3/2019 MC305C-3
Extending and Grounding the
Outriggers
• Keep people away from the machine when
setting the outriggers.
Staying around the machine may cause serious
accidents such as getting caught between an
outrigger and the machine main unit.
• Always monitor the level to level the machine
when setting the outriggers.
When the machine tilts for "3 degrees" or more,
the overturning alarm buzzer sounds.
• Set the outriggers so that the rubber tracks are
about 50 mm above the ground.
After setting the outriggers, verify that all the four
outriggers are securely set.
• The outriggers of this machine can be set
flexibly according to the terrain. However, if the
outriggers cannot be set in the "outrigger
maximum extension" state, perform the crane
operation with the values given in the "Rated
total load chart with outrigger medium
extension" and "Rated total load chart with
outrigger minimum extension" in the rated total
load chart.
• When extending and grounding the outriggers,
always maintain the outrigger rotary at the
extension position, and insert the position pin to
the end. Do not set the outriggers with the
outrigger rotary stowed.
• There are four outriggers. Be careful not to
mistake 8 outrigger switches for the others.
Check the numbers shown on the "operation
plate" at the switch section and the location of
the "number plate" affixed to the outriggers.
Wrong operation can lead to serious accidents.
• When operating two outrigger grounding
switches at the same time, choose two front
switches (outrigger (1) and (4)) or two rear
switches (outrigger (2) and (3)). Operating two
left or right switches at the same time will
suddenly raise two outriggers on one side,
causing overturning of the machine.
• When raising the machine, operate the four
outrigger switches to raise them gradually and
uniformly. Suddenly raising two outriggers on
one side will overturn the machine.
• Reduce the engine speed to low speed when
operating the outrigger switches.
• At the high engine speed, the outriggers operate
suddenly, leading to serious accidents such as
overturning of the machine.
• Do not extend the outriggers with the outriggers
set. Doing so applies unreasonable force on the
outriggers, resulting in the outrigger breakage.
• Always set the travelling lock lever to the
"LOCK" position when operating the outriggers.
CAUTION:
• Always keep the boom at the "fully retracted,
lowest position and slew and store position"
when operating the outriggers. The
outriggers cannot be operated if the boom is
not stowed completely. (Verify that the boom
stowing lamp (green) on the outrigger
display is ON.)
• After extending the outriggers, verify that
the outriggers are securely set.
• If all the outriggers are not securely set, the
crane operations will not be enabled. (Verify
that all of the extension lamps and setting
lamps (green) of the outrigger display are
lit.)
WARNING!
• Make sure all the outriggers are placed
properly before performing crane operation.
• This machine features a safety-interlock
system that prevents crane operation unless
all the lamps, other than the boom stowing
lamp on the outrigger monitor, are on.
• Always place the machine in a horizontal
position with the use of the level when
extending the outriggers. A warning buzzer
sounds when the machine is inclined 3° or
more and stops when the machine is placed
in a horizontal position.
• When the crane is used with the outriggers
extended other than at the maximum, crane
operation should proceed with respect to
the values specified in the rated total load
chart corresponding to "MIN./MID.
OUTRIGGER POSITION".
• Failure to perform crane operation with
proper values may cause the machine to
topple over. Exercise caution when
performing operation.
• Despite the maximum extension of all the
outriggers, the width of extended outriggers
decreases due to an ungraded ground even
when clearance "a" in the figure is 50 mm.
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