Hydraulic circuit system for hydraulic working machine

摘要

A hydraulic circuit system includes a shuttle block, and shuttle valves are arranged and connected within the shuttle block. The maximum pressure in a predetermined operation signal pressure group selected from operation signal pressures generated by pilot operating units is selected to produce a control signal pressure within the shuttle block. The control signal pressure is output to control devices such as a track communicating valve, a swing brake cylinder, and regulators for hydraulic pumps.