三轮农用运输车启动困难的故障较为常见,为便于机手全面掌握产生这一故障的原因和准确判断排除而归纳如下,供机手排除这一故障时参考。一、启动操作不当引起的不易启动1.操作不当的表现(1)启动时油门过大或给油过早。由于供油过早和供油量过大,虽然混合气浓,但会造成燃烧室内积油多,降低燃烧室温度,反而不易燃。(2)气温低、机体凉、机油粘度大、阻力大,不利于爆燃着火。(3)多次启动没爆发,燃烧室内积油过多,混合气温度降低也不易着火。这些操作都造成了难于启动。2.正确启动的操作方法 (1)无论冬夏,启动前都要摇曲轴20圈左右,待机油达到轴瓦等处后再行启动,既降低阻力又减小磨损;对久置不用的、保养维修润滑系的、新购入或大修后的车,启动前应摇曲轴100～120圈后 Three farm vehicles difficult to start the more common fault, in order to facilitate the hands of a comprehensive grasp of the causes of this failure and accurate judgment and summarized as follows, for the hands to exclude this fault reference. First, start the operation caused by not easy to start 1. The performance of improper operation (1) start when the throttle is too large or too early to feed. Due to the fuel supply too early and the fuel supply is too large, although the mixture is thick, but will result in more oil in the combustion chamber, lower the combustion chamber temperature, but not flammable. (2) low temperature, the body cool, oil viscosity, resistance, is not conducive to deflagration fire. (3) many times did not start the outbreak, excessive combustion chamber oil, the mixture is not easy to reduce the temperature on fire. These operations have caused difficult to start. 2. The correct method of operation (1) regardless of winter and summer, crankshaft must be cranked about 20 laps before waiting until the oil reaches the bearing and then at the start, not only reduce the resistance and reduce wear and tear; long set aside, and maintenance Lubricating system, the newly purchased or overhaul of the car, before starting the crank shaft should be 100 to 120 laps