Importance

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Abstract

A mobile lift crane includes a carbody having moveable ground engaging members; a rotating bed rotatably connected to the carbody such that the rotating bed can swing with respect to the ground engaging members; a boom pivotally mounted on the rotating bed; a first hoist drum mounted in a first frame connected to the rotating bed; a second hoist drum mounted in a second frame connected to the rotating bed; and a third hoist drum mounted in a third frame indirectly connected to the rotating bed by being connected to at least one of the first and second hoist drum frames. Preferably load hoist drum frames are connected to the rotating bed by removable pins, the hoist drum and frame thus being detachable from the rotating bed as a combined unit. Further a major crane component, such as a mast, a mast stop, a backhitch or a boom stop, is connected indirectly to the rotating bed such that forces directed along a line of action of the major crane component are transferred to the rotating bed through at least one of the drum frames.

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First Claim