一台ZL40B型装载机,曾两次出现发动机启动后启动机的单向离合器不回位,磁力开关触点常通,启动机被烧毁的事故。究其原因:一是点火锁短路,二是启动机磁力开关触点粘连。改进的方法是增加启动机保护电路(见图1),有效地预防了启动机单向离合器不回位被烧毁的故障。在原电路基础上增加1个大电流继电器(蓄电池继电器)、1个带常闭触点的 A ZL40B-type loader, there have been two engine start after the start-up one-way clutch does not return, the magnetic switch contacts often, the starter was burned accident. The reason: First, the ignition lock short circuit, the second is the starter magnetic contact adhesion. The improved method is to increase the starter protection circuit (see Figure 1), effectively preventing the starter one-way clutch is not returned to be burned fault. On the basis of the original circuit to increase a large current relay (battery relay), a normally closed contact with the