This book is compiled by the teaching team of Guangxi Mechanical and Electrical Engineering School for students majoring in agricultural machinery maintenance. It aims to cultivate high-quality agricultural machinery operators to improve labor productivity, reduce labor intensity, promote farmers' income growth, and achieve large-scale, intensive, and standardized agricultural production. The textbook focuses on vocational ability, with content that is illustrated, easy to understand, and highlights key points. The book is written in a graded modular style, divided into nine modules, covering basic knowledge of tractors, use, maintenance and upkeep, running-in, fuel selection, diesel engine maintenance, chassis use and maintenance, electrical equipment use and maintenance, working device use and maintenance, electronic control systems, and common faults and troubleshooting.