3064 and 3066 Engines for Caterpillar Built Machines Caterpillar


Electric Starting System - Test

Usage:

320B L 1ES


使用万用表的直流电压 (DCV) 范围来查找起动系统失效的部件。

转动起动控制开关以使起动电磁阀通电工作。 起动电磁阀的操作可以从起动马达的小齿轮与发动机飞轮齿圈啮合时发出的声音中听出来。

如果起动马达电磁阀不工作,蓄电池的电流可能没有流到电磁阀。 此时,将万用表的一根导线接到电磁阀的蓄电池电缆接头(接线端)。 将另外一根导线良好接地。 如果读数为零,则表示来自蓄电池的电路断路。 若万用表上显示电压读数,则需进一步测试。

电磁阀的操作同时也接通了通向马达的电路。 将万用表的一根导线接到与马达相连的电磁阀接头(接线端)。 将另外一根导线良好接地。 让起动电磁阀通电工作,观察万用表。 如果显示蓄电池电压读数,则说明问题出在马达上。 此时必须拆下马达作进一步测试。 如果万用表读数为零,则说明电磁阀触点没有闭合。 这表示电磁阀需要进行修理,或起动马达小齿轮间隙需要修理。

进行以下测试。 将万用表的一根导线接到电磁阀的细线接头(接线端)上,另一根导线接地。 让起动电磁阀通电工作的同时观察万用表。 如果显示电压读数,则说明问题出在电磁阀上。 如果读数为零,则说明问题出在起动开关或起动开关的导线上。

将万用表的一根导线接到蓄电池接线接头(接线端)的起动开关上。 将另外一根导线良好接地。 若读数为零则说明来自蓄电池的电路开路。 检查断路器和接线。 如果显示电压读数,则问题出在起动开关或起动开关的导线上。

起动马达转得太慢可能是因为被起动的发动机的摩擦过大而导致过载。 起动马达转得慢还有可能是因为短路、松动的接头和/或马达内有灰尘等原因造成的。

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