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1.故障现象1台沃尔沃EC210B型挖掘机作业中,出现左侧履带单独行走无动作故障,而两侧履带同时行走时正常,且无跑偏现象。检测电气系统数据正常,检查机械传动部件也正常,初步判定为液压系统故障。该挖掘机能够直线行走正常,说明液压泵、先导控制阀、中央回转接头及行走马达无故障,故障位置可能在主控制阀。
1. Symptom In a Volvo EC210B excavator, there is no action fault on the left crawler alone, while the crawlers on both sides are walking normally without deviation. Check the electrical system data is normal, check the mechanical transmission components are normal, the initial determination of the hydraulic system failure. The excavator can walk straight, indicating that the hydraulic pump, the pilot control valve, the central rotary joint and the traveling motor have no trouble, and the fault position may be in the main control valve.