排除工程机械故障一般采用以结构为基础的正推法，可操作性差。本人根据多年使用和维修工程机械的经验采用倒推法，即从故障现象入手，提高了排除故障的可操作性，可以快速排除故障。1．发动机不能起动工程机械上发动机的结构基本上都是相近的，目前常用的有以高压油泵为代表的 Excluding construction machinery failure is generally based on the structure of the positive push method, poor operability. According to years of experience in the use and maintenance of construction machinery, I use the push-back method, that is, starting from the phenomenon of failure to improve the troubleshooting of maneuverability, you can quickly troubleshoot. 1. The engine can not start Engine construction on the mechanical structure are basically similar, there are commonly used high-pressure oil pump as the representative