苏联内燃机车的保养和修理有下述几种形式:技术保养、日常修理、中修和大修。技术保养和日常修理是保证内燃机车正常运行的主要预防措施。技术保养分为三个等级,即:一级技术保养(TO—1)、二级技术保养(TO—2)和三级技术保养(TO—3)。技术保养是指:为了使内燃机车保持自己的工作能力和清洁,使摩擦件得到润滑,走行部、制动设备、信号、控制系统得到检查以保 The maintenance and repair of the Soviet Union diesel locomotive in the following forms: technical maintenance, routine repair, repair and overhaul. Technical maintenance and routine repair is to ensure the normal operation of diesel locomotive the main preventive measures. Technical maintenance is divided into three levels, namely: TO-1, TO-2 and TO-3. Technical maintenance means: In order to make the diesel locomotive maintain its own ability to work and clean, the friction parts are lubricated, walking department, brake equipment, signal, control system to be checked