Section 4 – CRANE OPERATION Mini-Crawler Crane M A E D A
4-64 9/2020 MC285CB-3
WARNING! The following safety messages
address a potential Unsafe Operation Hazard
while hoisting or lowering a load:
• Do not continue to hoist a load if the
overwind alarm detector sounds. Stop the
operation immediately and return all
operation levers to the NEUTRAL position.
• Do not hoist a load if the wire rope cable is
twisted. Eliminate the twist in the wire rope
cable before hoisting a load.
• Do not allow the hook block to contact the
boom while hoisting a load. Damage to the
boom, hook block and/or wire rope cables
may result. Always maintain clearance
between the hook block and boom when
hoisting a load.
• Do not allow the hook block to contact the
boom when extending the boom. When
extending the boom, the hook block will
start to move toward the boom. Do not allow
the hook block to contact the boom. Damage
to the boom, hook block and/or wire rope
cables may result. Always maintain
clearance between the hook block and boom
when extending the boom.
• Never use damaged wire rope cable to hoist
or lower a load. The wire rope cable must be
in operation-ready condition to hoist or
lower a load.
• Do not allow the wire rope cable to become
twisted or wind irregularly onto the winch
drum. The wire rope cable must wind
uniformly onto the winch drum to prevent
damage to the wire rope cable.
WARNING! Entanglement Hazard. Always
keep the hook block away from people when it
is not in use. Keep the hook block wound up
and away from people if it is not in use.
WARNING! Tip Hazard. Never allow a hoisted
load to contact an outrigger. Always use
caution to prevent the hoisted load from
contacting an outrigger.
Hook Raising / Lowering Procedure
The volume of the hydraulic oil in each of the
cylinders changes depending on the temperature.
When left in idle with a hoisted load, the oil
temperature and hydraulic oil volume will
incrementally drop, and may cause the loaded
boom angle and boom length to decrease. If this
happens, perform boom lift and boom extension
operations as appropriate to correct.
Move the winch lever (3) as follows:
Fig. 4-161
• Lower: Push the lever forward to DOWN.
• Neutral: Release the lever. The lever will return
to the NEUTRAL position and stop the raising
and lowering of the hook block.
• Raise: Pull the lever toward you to UP.
Adjust the winch raising and lowering speed with
the winch lever and travel of the accelerator
levers.
While lowering the hook block, do not allow the
hook block to hit the ground.
The machine is equipped with a stop
alarm/automatic stop safety device. When only a
few windings of the wire rope cable remain on the
winch drum the alarm sounds and the
Over-Unwinding Stop Display flashes in red.
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