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Effer offers a slewing ring rotation double slewing system on its 955 crane. This kind of rotation uses two gear motors in alternative to the single standard. The advantage of the new rotation system is a further reduction of the clearance, and yet more reliable precision. Thanks to a new pressures balancing system, during the phase of rotation stop, all mechanical clearances are recovered. The result is a precision of movements particularly useful when load is fragile and its positioning requires a supplementary degree of precision — a solution in case of the positioning of glass & windows or in slopes working situations.