On July 16, the lack of a lift chain parts are overweight. (Chain lift 16 tons but can lift heavy weight 17 tons), which works much weight should the crane 2.
On July 16 the past chain is missing from the work piece weight exceeding (chain can lift it 16 tons, but there are 17 weight lifting tons), which eliminates the weight work should use 2 panchan selection.
On 1 July, the lack of a lift chain pieces with a weight over (supply chain can lift tons. 1. A Weight lifting but 1 tons) which work very much weight should be used a boom 2.