Maeda MC815C, Operation Manual, Page: 55 / 426

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CAUTIONS WHEN SLINGING
• Check the following before hoisting a load.
Attempt to hoist the load without checking may result in serious accidents by dropping the
load or tripping.
• Observe the values in the rated total load chart.
• Hoist from the centre of gravity of the load.
• Check that the wire rope of the hook block is vertical.
• When the load leaves the ground, stop winding up the load once and check whether the
load is stable.
• Before hoisting a slung load, always check whether the sling wire rope “retainer device” of the
hook block is hung correctly. If the “retainer device” is not hung, the wire rope may leave the
hook block and cause the load to fall resulting in a serious accident.
• Larger wire rope angle when hoisting the load increases force that applies to the wire rope
even when the load weight is unchanged, thus may cause the wire rope to snip. Give due
consideration to slinging operation so that excessive force is not applied to the wire rope.
• Hoist only 1 load at a time.
Attempts to hoist more than one load may cause the hoist bracket to hit and damage the other
hoisted load, or the loads move and lose balance, causing serious accidents such as tripping.
Do not hoist more than 2 load at a time even if the total combined weight is within the rated
total load.
• Hoisting of lengthy load causes the load to lose balance and is dangerous.
In the case of such load, hoist vertically by using a cramp, or achieve balance of the hoisted
load by applying a rope to both ends of the load.
CAUTIONS WHEN HANDLING WIRE ROPE
• Wire ropes can wear out from constant use or old age, so be
sure to inspect every time before work, and replace
immediately if at or beyond the replacement standard.
At the same time, inspect the sheave at the tip of the boom
and the sheave of the hook block. Damaged sheaves
accelerate the damage of the wire ropes.
• Use wire ropes specified by us.
• Always wear leather gloves when handling the wire rope.
• Do not use a wire rope of which any of the following applies:
• 10 % or more of strands (except a filler wire) in 1 twist of
a wire rope are snipped.
• The wire rope diameter abrasion is beyond 7% of the
nominal diameter.
• Kinked wire rope.
• Excessively deformed or corroded wire rope.
• Affected by heat or sparks.