1. The large duty gantry crane must obey the relevant parts of the motor safety operation procedures, and the operation process should have a heavy-duty command.
2. Must not adjust the brakes of the hoisting mechanism during the large duty gantry crane working. When lifting heavy objects, the hoisting weight is not allowed to pass over the person.
3. Must not lift the load when it is overloaded or the weight of the object is unclear. And, must not work if It is found that the large duty gantry crane has a safety-affecting fault.
4. Must not lift when the some person or floating objects on the object.
5. If the venue is dim, and it is impossible to see the objects and the command signals, the large duty gantry cranes do not allowe to lift.
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