... oil tank device, oil pump device, control valves, accumulator device, piping, electrical control, and etc.1) Oil tank device: ... the main pipe ling pressure release.4) Electrical control: Hydraulic system is controlled by the main operation ... pressure, filter clogging etc) display alarmingAccident emergency parkingHydraulic control is achieved by PLC control system.3 STRUCTURE FEATURE1) The hydraulic ...