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针对某型液压挖掘机在使用过程中出现的无回转动作故障,按照故障分析排查流程图,依次对回转制动开关、回转马达及其阀组、回转减速器及回转支承、主控阀进行故障排查,最终确定液压系统中颗粒污染物在重力等作用下淤积于主控阀内,导致回转阀芯轴线相对阀体轴线偏心(不同轴),阀芯与阀体间摩擦力增大,进而卡死是导致故障的主要原因。清洗重装主控阀后,故障排除。
Aiming at the trouble of non-swivel action during the operation of a hydraulic excavator, according to the fault analysis and troubleshooting flow chart, turn the rotary brake switch, rotary motor and its valve block, rotary reducer, slewing bearing and main control valve in turn After investigation, it is finally determined that particulate matter in the hydraulic system is deposited in the main control valve under the action of gravity, etc., causing the axis of the rotary valve spool to be eccentric (different axis) relative to the valve body axis and the frictional force between the valve spool and the valve body increases, Stuck is the main reason leading to failure. After cleaning reloading main control valve, troubleshooting.