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一台EX220-5型液压挖掘机开始工作时,各部动作均正常。但工作一段时间后,出现双向皆不能回转故障,随后发动机自动怠速功能也消失。1.原因分析该机为双泵液压系统,其中左泵向铲斗缸和右行走马达供油,右泵向回转和左行走马达供油,动臂缸和斗杆缸则采用双泵合流供油。从故障现象看,左、右行走和工作装置动作均正常,故障原因应在回转油路系统,可能是:回转马达或主控制阀有故障;回转制动不能解除;回转装
When an EX220-5 hydraulic excavator started to work, all the movements were normal. However, after a period of work, there are two-way rotation failure can not occur, followed by automatic engine idle function disappears. 1. Analysis of the reasons for the machine is a double pump hydraulic system, which left to the bucket cylinder and the right travel motor oil supply, the right pump to the left and the left travel motor oil, boom and arm cylinder cylinder is the use of dual-pump confluence oil. From the phenomenon of failure, left and right walking and working equipment movements are normal, the cause of the malfunction should be in the rotary oil system, may be: rotary motor or main control valve failure; swing brake can not be released; slewing