Maeda MC-305C-2 - Page 43

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CAUTIONS WHEN OPERATING WINCH
• 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.
• If the wire rope is twisted and causes the hook block to turn, fully
eliminate the twist before work.
See “ Operation 4.2 What to do with Twisted Winch Wire Rope”
for details.
CAUTIONS WHEN OPERATING BOOM
• Be slow as much as possible when operating the boom operation
lever.
Especially avoid sudden lever operations when the load is hoisted,
which may cause the load to waggle and give large impact to the
Machine, and thus may damage the crane or trip the Machine.
• When the boom is lowered, the working radius increases, and the
rated total load that can be hoisted decreases. When working while
raising/lowering the boom, pay extra attention so that the mass
(weight) of the load at the time the boom is most lowered does not
cause overloading.
• Attempts to pull the load laterally or pull to bring forth the load by
raising/lowering and/or extracting/retracting operation of the boom
are prohibited. Do not attempt under any circumstance.
• Be aware of the hook block windup condition and exercise caution
when extending or retracting the boom.
• When the boom is extended, the working radius increases, and the
rated total load that can be hoisted decreases. When working with
extending/retracting the boom, pay extra attention so that the mass
(weight) of the load at the time the boom is most lowered does not
cause overloading.