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One rope or two?

Can the advantage of being able to operate on a single-rope crane overcome the higher cost, higher tare weight and complexity of motor-driven grabs?
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Most manufacturers include “motor” grabs in their portfolio, with the majority of these relying on a cable power feed from the crane to supply an electrical motor, which in turn powers a hydraulic power pack to feed the hydraulic cylinders that open and close the clam shells or cactus grab segments.
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