Section 4 – RADIO REMOTE CONTROL SYSTEM OPERATION Mini-Crawler Crane M A E D A
4-112 9/2020 MC285CB-3
Crane Operation
WARNING! The following safety messages
address a potential Tip Hazard while operating
the crane:
• Verify that all outriggers are positioned correctly
before operating the crane. All outriggers must
be properly positioned before starting any crane
operation.
• Do not overload the hoist when performing a
crane operation. Always keep the load limit
within the specified limit as stated in “RATED
TOTAL LOAD CHARTS” on page 3-14.
• Do not perform multiple operations at the same
time. Only perform one operation at a time while
hoisting or lowering a load. Performing multiple
operations while hoisting or lowering a load may
cause an abrupt change of the load conditions.
WARNING! Sudden Movement Hazard. Always
activate the operation lever with caution. It
must be properly controlled to keep the
appropriate crane operation speed and avoid
any abrupt motion. Abrupt acceleration or
deceleration, especially while loaded, may
cause impact to the crane.
WARNING! Especially avoid sudden lever
operations when the load is hoisted, which
may cause the load to waggle and a give large
impact to the crane, and thus may damage the
crane or trip the machine.
CAUTION: Do not force any of the transmitter
operation levers against its stop. Forcing a
transmitter lever against its stop could result
in damage to the transmitter.
Check for smooth and free movement of each
operation lever on the transmitter. Levers must
return to the NEUTRAL position when released.
WARNING! Sudden Movement Hazard. Do not
operate the machine using the transmitter if
the levers do not return to the NEUTRAL
position freely. Levers must return to the
NEUTRAL position freely for proper operation
of the transmitter.
CAUTION: Before operating the crane, switch
the operation mode selector switch to “Crane.”
Leaving the switch in Outrigger mode is
extremely dangerous, as the outriggers may
operate unexpectedly.
1. Position the outriggers. See “Outrigger
Operation” on page 4-109.
2. Switch the operation mode selector switch to
“Crane.”
Fig. 4-279
Hook Raising/Lowering Operation
WARNING! Overload Hazard. Do not continue
to raise the hook if the over winding detector
alarm is activated. Continued operation could
cause the wire-rope cable to break.
WARNING! Sudden Movement Hazard. Always
raise or lower the hook steadily and slowly
when using the winch or telescoping the
boom. Do not allow the hook to raise or lower
too quickly for the conditions.
With the boom deflection, the hoisted load slightly
shifts forward. Notify workers in the area such as
slinging operators.
If the hook block is hoisted excessively, two block
is detected, and an alarm buzzer sounds. In such
a case, immediately shift the right operation lever
into the “Neutral” position to stop winding the wire
rope.
If the hook block is unwound excessively, such as
during underground work, over-lowering is
detected, and an alarm buzzer sounds. In such a
case, immediately shift the right operation lever
into the “Neutral” position to stop unwinding the
wire rope.
CAUTION: Do not let the hook block touch the
ground. The wire rope may become tangled on
the winch drum, damaging the wire rope.
Move the operation lever (11) as follows:
• Lowering: Push the lever forward.
• Neutral: Release your hand from the lever.
The lever will return to the “Neutral” position and
the hoisting/lowering of the hook block stops.
• Hoisting: Pull the lever toward you.
NOTICE: Adjust the raising and lowering speed of
the winch by moving the lever forward or
backward.
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