793F Series AC Off-Highway Truck Chassis Electronic Control System Caterpillar


General Information

Usage:

793F AC EMD
可通过仪表组或 Cat® 电子技师(Cat ET)维修工具访问系统 ECM 的诊断。

参考对系统进行故障诊断与排除需要来自机器手册的附加信息:

  • 测试和调整

  • 故障排除

  • 电气示意图

  • 液压示意图

  • 零件手册

  • 操作和保养手册

作为参考,本手册结尾包括一个简化的电气示意图。 有关详细的示意图,请参考电气示意图。

当故障诊断与排除步骤指示要"修理或更换线束"时,使用机器的电气示意图来追查电路。 在线束接头上执行持续性检查,以便找到线束故障。 务必检查部件接头上的接地电路。 系统接地和机架接地之间的电阻必须小于 5 欧姆。 大于 5 欧姆的接地电阻会导致故障诊断产生错误。

故障诊断和排除过程中,在更换部件之前应先检查所有连接。 不清洁、不紧固的连接会导致永久性或间歇性电气故障。 检查并确认已将导线完全推入接头中。 对所有导线连接执行 10 lb 的拉力测试。

如果在故障诊断和排除过程中导线绝缘被刺破,使用 8T-0065 RTV 硅胶密封剂 密封损坏的导线。 在密封胶上缠上两层 1P-0810 胶带 。

一个电气部件的故障可引起或由其他部件的故障引起。 在更换部件之前,务必先更正产生电气故障的原因。

当从 ECM 上拆卸线束时,使用线束接头中央的单螺钉。

Caterpillar Information System:

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