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(1)不注意磨合保养。未磨合前，新车配合件工作表面有许多凹凸不平处，此时若投入全负荷作业，摩擦件表面不易形成油膜，还会产生拉伤、烧结等现象，使零件磨损加剧。因此，机手须按说明书要求，对发动机及底盘进行磨合 (达到规定的磨合时间 )，然后更换机油，检查、调整和紧固
(1) do not pay attention to running-in maintenance. Before the break-in, there are many irregularities on the working surface of the new car cooperating parts. If the full load operation is put on at this time, the surface of the friction part will not easily form an oil film, and the phenomenon of strain and sintering will also occur, which will aggravate the wear of the parts. Therefore, the driver must follow the instructions, the engine and the chassis run-in (to meet the provisions of the run-in time), and then replace the oil, inspection, adjustment and fastening