Maeda MC815C, Operation Manual, Page: 59 / 426

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COOPERATION HOISTING IS PROHIBITED AS A GENERAL RULE
Cooperation hoisting, where 2 or more cranes are used to hoist a single load, is strictly
prohibited.
Cooperation hoisting is very hazardous and may cause the machine to fall due to an uneven
centre of gravity, unscheduled fall of the hoist load or boom damage.
If cooperation hoisting is required for unavoidable reasons, discuss and establish a work
scheme under the responsibility of the user, let the worker fully acknowledge the work method
and procedures, and only proceed under the direct leadership of the work supervisor.
Also, observe the following cautions:
• Use the cranes of same model.
• Choose the Machine model that can handle sufficiently larger load than the load to be
hoisted.
• Make sure only 1 person gives signals.
• Limit the crane operations to single operations as a rule, and do not attempt any slewing
operation.
• Appoint 1 responsible sling operator who is most experienced.
Work at workplace where lift below ground level is performed
• When lowering a wire rope in work underground, leave at least 3 loops of wire rope on the
winch drum. This machine is equipped with an excessive unwind detector as a safety device.
Take care not to invite situation that requires safety device to function.
• Make sure to give signals.
• Perform crane operation with extra care.
OPERATION CHECK OF CRANE MODE BY TRANSMITTER AND CAUTIONS DURING
OPERATION (REMOTE CONTROL SYSTEM)
• Never move your hand off the Transmitter whose power is turned ON. Be sure to turn OFF the
power of the Transmitter when moving a place, performing work other than remote control,
taking a break and terminating work.
• Immediately press the emergency stop switch to stop the Transmitter in an emergency or
when a malfunction, however small it is, occurs in the working range of the machine.