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W4－60C（74式Ⅱ型）挖掘机采用双泵双回路中高压定量系统，工作装置由6个手柄操纵控制：驾驶员在作业时手操纵力为50N，频繁操作手柄，容易产生疲劳；操纵杆排列不紧凑；操纵间组由9片阀组成，阀杆在12mm行程范围内动作时容易产生错位，使系统回油不朽，出现液压共振现象，挖
W4-60C (74 type II) excavator adopts dual-pump dual-circuit high-pressure quantitative system. The working device is controlled by 6 handles: the driver’s manual operating force is 50N during operation. Frequent operating handles are prone to fatigue; The rod arrangement is not compact; the control room group consists of 9 valves, and the valve stem is easily misaligned when it is operated within the range of 12mm stroke, so that the system returns oil to be immortal and a hydraulic resonance phenomenon occurs.