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Our machine has SWL of 20 tons, it works of four ropes, two to hoist and lower, two to close and open the grab, which are driven by two 315 kw ***** weight of the trolley is 3 tons that leaves us with 17 tons which includes the weight of the grab and cargo.Required : 12 cubic meter grab with cutting edges The weight of the grab The clamping force four rope, 12 cubic meter, mechanical grab mechanical grab 12 cubic meter