Mini-Crawler Crane M A E D A Section 4 – WORKING WITH CRANE
1/2019 MC405C-3 4-57
• If the overwinding detector alarm buzzer is
heard, immediately leave your hand from the
winch lever. The hook block winding stops.
Then, operate the winch lever to Down (push
forward) to wind down the hook block. In
addition, the hook block is wound up when the
boom is extended, so be sure to ensure extra
clearance between the boom and the hook
block during work.
• When the boom extends, the hook block is
wound up.
Operate the winch lever to Down (push
forward) to wind down the hook block while you
extend the boom.
• Whenever an overload occurs during work,
lower the load by winding down the winch by
setting the winch lever to Down (push forward).
Do not raise or lower the boom acutely. Such
attempt may cause serious accidents by
tripping.
• The volume of the hydraulic oil in each of the
cylinders changes depending on the
temperature.
By leaving idle with a load being hoisted, as the
time passes by the oil temperature drops and
the hydraulic oil volume decreases, and
changes such as the boom derrick angle
decrease and boom length decrease may
occur.
In that case, execute boom derricking
operations and boom extension operations
appropriately to correct.
• Do not leave the operation position when a load
is hoisted.
Lower the load before leaving the machine.
• Keep the hook block wound up when not in
use.
Otherwise, person near the load may collide
the hook block without load.
• The operator must always ensure that no one is
ever underneath a hoisted load.
To ensure safety, any lifting carried out over the
operator's seat must be operated by remote
control.
Cautions When Operating Winch
Fig. 4-141
Fig. 4-142
• Do not let persons enter below the hoisted
load.
• When hoisting a load, always stop once at the
"takeoff" position where the hoisted load leaves
the ground. Check subjects such as load
stability and load force, then hoist up the load.
• Do not pull laterally, pull toward you or hoist
diagonally. Such attempt may cause the crane
to trip or suffer damage.
• Overwinding of the hook block may result in
collision with the boom, snipping the wire ropes
and causes the hook block and load to fall and
cause serious accidents. Be fully careful to
prevent overwinding the hook block.
• Be careful to prevent the wire rope and/or
hoisted load from contacting an obstacle such
as a tree or steel when hoisting a load.
• If caught by an obstacle, do not forcibly wind up
the hoist load, but untangle the caught part
before winding up.
• Do not use the winch drum wire rope in random
condition. If random, not only the wire rope
suffers damage and shortens the lifetime, but
the wire rope may snip and causes serious
accidents.
Observe following precautions to avoid wire
rope from becoming random.
• Do not let the hook block hit the ground.
• Before leaving the hook block lowered for a
long time for instance when working with
underground, leave at least three loops of
wire rope in the winch drum.
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