HOOK BLOCK STORAGE DEVICE FOR CONSTRUCTION MACHINE

摘要

PROBLEM TO BE SOLVED: To provide a hook block storage device capable of simplifying the structure of a hook block storage circuit, reducing the cost, and loosely storing a hook block.;SOLUTION: Pilot pressure pipelines 13a' and 13b' extended from a pilot pump 37 are connected to the winding circuit 13a and unwinding circuit 13b of a winch motor 13. At a normal winding operation, the pressure oil discharged from a direction control valve 21 for controlling the winch motor is fed to the winding circuit 13a. At a hook block storage operation, a pilot pressure is fed to the winding circuit 13a through the pilot pressure pipeline 13a'. A speed selector valve 30 switching the revolving speed of the winch motor 13 is provided.;COPYRIGHT: (C)2002,JPO