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1.故障现象1台山重建机GC78型履带式液压挖掘机在整机无操纵动作5s后,其发动机不能自动恢复怠速状态。根据该挖掘机故障现象.初步判断足其负载敏感液压系统中先导液压回路出现问题。为此我们在分析该机液压系统结构和先导液压回路工作原理基础上,进行故障排查。2.负载敏感液压系统结构山重建机GC78型挖掘机采用具有抗饱和功能、分流比负载敏感压力补偿液压系统。该液压
1. Symptoms 1 Taishan reconstruction machine GC78 crawler hydraulic excavator in the machine after no action 5s, the engine can not automatically resume idle state. According to the excavator fault phenomenon, it is initially judged that there is a problem in the pilot hydraulic circuit of the load-sensitive hydraulic system. To this end we analyze the machine hydraulic system structure and pilot hydraulic circuit based on the working principle of troubleshooting. 2. Load-sensing hydraulic system structure Mountain rebuild GC78 excavator with anti-saturation function, shunt than the load-sensitive pressure compensation hydraulic system. This hydraulic pressure