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1.故障现象1台沃尔沃L220E型装载机铲斗装满矿石后,动臂不能单独操纵提升,且铲斗也无法单独向内翻转;铲斗空载时单独提升动臂,只能提升到额定提升高度的1/4,且铲斗单独向内翻转动作也很缓慢;而在同时操纵动臂和转向动作时,动臂提升正常。2.液压系统组成及原理(1)组成沃尔沃L220E型装载机液压系统主要由中间阀中心阀块1、风扇马达2、行车制动蓄能器组3、停车制动器4、转向阀5、控制阀(多路阀)6、先导操作阀(伺服阀)7、P1泵、P2泵、P3泵等
1. Symptom After a Volvo L220E loader bucket full of ore, the boom can not be individually manipulated to lift, and the bucket can not be turned inward alone; Bucket bucket lift alone when the lift alone, can only be upgraded to rated The lifting height is 1/4, and the bucket alone turns inward is also very slow; while in the simultaneous manipulation of the boom and steering movements, the booms to normal. 2. Composition and principle of hydraulic system (1) Composition The hydraulic system of Volvo L220E loader mainly consists of center valve block 1, fan motor 2, service brake accumulator group 3, parking brake 4, steering valve 5, control valve (Multi-way valve) 6, the pilot operated valve (servo valve) 7, P1 pump, P2 pump, P3 pump