The paper introduces the operational status of main wire rope reeving system for bridge grab shipunloader,and gives a solution to reasonable maintenance and partial improvement of the system,improving the wire rope operational security and economy.

This paper gives the calculating formulas for the pre-tension of the wrapping wireswhich considers the effects of the voids in the main cable, and discusses the selection of the timeand the technical requirements for wrapping the main cable with steel wires.

Analyzed the reasons of fault which happened no wire feeding and wire can not be cut in theproduction of XJL-LG tire bead winding extruding line, and have the structure of two devices modified toreach the good condition finally.