M A E D A Mini-Crawler Crane Section 4 –
DESCRIPTION ON OUTRIGGER AND CRANE SAFETY DEVICES
3/2019 MC305C-3 4-29
Perform crane operations.
• Work selector switch "Crane"
• Crane operation with levers
• Boom stowing lamp on display panel
OFF
• Actual work and the rated total load
are compared, and the working status
lamp up according to the load factor.
• Load factor for illuminating working
status lamp
• Load factor less than 90 %: Working
status lamp (green) ON
• Load factor 90 to less than 100 %:
Working status lamp (yellow) ON,
alarm sounds intermittently.
• Load factor 100 % or more: Working
status lamp (red) ON, alarm sounds
continuously.
Moment limiter
• When the load factor reaches
100 % or more (overloaded),
hook raising, boom extending,
and boom lowering operation
stop.
When one of the outriggers go
up in the air during crane
operation
• Setting lamps (red) on display panel
flash
Crane interlock device
• If any of the extension lamps
and setting lamps (total of eight)
goes off, hook raising, boom
extending, and boom lowering
operation stop.
When the hook was raised
excessively
• Alarm buzzer sounds continuously
Over winding detector is
activated.
Hook raising operation stops.
When the hook was lowered
Excessively
• Alarm buzzer sounds continuously
Over winding detector is
activated.
Hook raising operation stops.
Cable warning is activated.
Hook lowering operation stops.
When the machine tilts for
3 degrees or more during crane
operation
• Alarm buzzer sounds continuously
Crane inclination alarm device is
activated
Crane Stowing Operation
Standard Operation
Sequence, Machine Status
Activation of Safety Devices
Operate the machine to take
the boom stowing posture.
• Fully retract the boom
• Boom horizontal stowing
position
• Boom slew and stow position
• Boom stowing lamp on display panel
ON
Outrigger interlock device
• If the boom stowing lamp
(green) does not light up, all the
outrigger operations stop.
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