BOOM HOIST CYLINDER CRANE

摘要

A crane having an upper works rotatably mounted on a lower works and a boom pivotally mounted on the upper works preferably includes a hydraulic boom hoist cylinder, a hydraulic circuit for controlling the hydraulic boom hoist cylinder, a multiple position wire rope guide, a counter weight positioning mechanism, and a boom parking device. The crane comprises a mast and a hydraulic cylinder pivotally connected to the upper works. The connection of the mast to the upper works is at a location separate from, and at an elevation below, the elevation of the connection of the hydraulic cylinder to the upper works. The hydraulic cylinder is pivotally connected to the mast and pendently connected to the boom. The crane also comprises an apparatus and method for lifting, positioning, and assembling a counter weight to the upper works. The apparatus and method includes pivotally connecting a counter weight pivot frame between the counter weight and the upper works and lifting the counter weight into position with the hydraulic boom hoist cylinder. The crane also comprises a multiple position wire rope guide and a method of repositioning the wire rope guide during assembly of the crane. The crane further comprises a boom parking device.