故障现象液压挖掘机动作缓慢且发卡,油温高时一侧链轨及工作装置失灵,油泵有异常响声,管路爆裂等。故障原因液压油泵建立不起高压油,说明液压部件有卸漏。经检查各路控制阀等部件无异常现象。检液压油泵主泵伺服活塞时,发现伺服活塞磨损,产生液压油泄漏,因而液压油泵形成不了高压油流,致使液压 Fault phenomenon Hydraulic excavator slow and hairpin, high temperature oil side chain and working equipment failure, pump abnormal sound, pipe burst and so on. Fault causes can not afford to build high-pressure hydraulic oil pump, hydraulic components have leakage. After checking the various control valves and other components without exception. Check hydraulic pump When the main pump servo piston, servo piston wear and tear, resulting in hydraulic oil leakage, so the hydraulic pump can not form a high-pressure oil flow, resulting in hydraulic