Secondary maintenance is generally carried out when the car is driving 6000~8000km. The main purpose is to carry out in-depth technical inspection and adjustment of vehicles to maintain good running performance. In addition to the first-level maintenance, it is also necessary to eliminate the faults and hidden dangers found. The driver should provide the maintenance workers with the bad technical conditions in vehicle operation and understand the main contents of secondary maintenance.
The three-level maintenance cycle is generally 36000~40000km, which is a maintenance measure to consolidate and maintain the normal service performance of each assembly after several secondary maintenance. It mainly includes assembly and disassembly, cleaning, inspection, adjustment and elimination of hidden dangers.