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(11) | EP 0 033 239 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Crane hydraulic control system |
(57) A crane hoise drive assembly having a hydraulic motor (20) driven by a variable displacement
hydraulic pump (21) and a control circuit (10) for the pump adapted to govern the
pump displacement so that the lift generated by said motor is independent of line
travel and is adjustably predetermined. |