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我单位一台ＰＣ２２Ｏ—５型小松挖掘机工作８５００ｈ后，出现铲斗油缸和左边行走马达工作无力的故障；但回转动作和右边行走工作正常，其余动作略显迟缓。 １故障分析 １．１故障因素 根据液压系统图１分析可知：（１）铲斗油缸无力的可能故障①控制铲斗的先导油路故障；②控
My unit PC22O-5 Komatsu excavator work 8500h, there bucket hydraulic cylinder and the left-hand travel motor weakness failure; but slewing and right to walk normal work, the rest of the action a little slow. 1 Fault Analysis 1.1 Fault Factors According to the hydraulic system analysis of Figure 1 shows: (1) bucket cylinder weakness may be the fault ① control bucket dipole pilot line fault; ② control