General Information
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:
793F and 797F Off-Highway Trucks Chassis Electronic Control System Electronic Control Module (ECM) - Configure
2008/12/08 A New Torque Sequence for the Valve Cover Is Now Used {1107}
854K Wheel Dozer and 992K, 993K Wheel Loaders VIMSTM 3G / Product Link Wiring Harness (Short Circuit) - Test
541 Track Feller Buncher, 551 Track Feller Buncher and 552 Track Feller Buncher Machine Systems Relief Valve (Line) - Test and Adjust
854K Wheel Dozer and 992K, 993K Wheel Loaders VIMSTM 3G / Product Link Wiring Harness (Open Circuit) - Test
793F and 797F Off-Highway Trucks Chassis Electronic Control System Electrical Connector - Inspect
Intermittent Erratic Shifting and Derated Engine rpm{1000, 3030, 3101} Intermittent Erratic Shifting and Derated Engine rpm{1000, 3030, 3101}
Procedure to Retrofit a Diesel Particulate Filter (DPF) for Emissions on a IT62G Integrated Toolcarrier, and on 950F Series II, 950G, and 962G Wheel Loaders{1061, 108F, 1091} Procedure to Retrofit a Diesel Particulate Filter (DPF) for Emissions on a IT62G Integrated Toolcarrier, and on 950F Series II, 950G, and 962G Wheel Loaders{1061, 108F, 1091}
2009/01/26 New Plate Assemblies Updated the Lighting Wiring Group and the Platform Wiring Group {1408, 1429}
793F and 797F Off-Highway Trucks Chassis Electronic Control System Electrical Output Components
2008/12/22 Test and Adjusting, RENR6480 Has Been Updated on SIS Web. {5070, 5070}
12K, 140K, 140K Series 2 and 160K Motor Graders Hydraulic and Steering System Valve and Linkage Group
793F and 797F Off-Highway Trucks Chassis Electronic Control System Electrical Component and Connector Locations
793F and 797F Off-Highway Trucks Chassis Electronic Control System Diagnostic Capabilities
793F and 797F Off-Highway Trucks Chassis Electronic Control System Event Code List
R2900G Load Haul Dump Cab Air Filter - Clean/Replace - If Equipped
735, 740 and 740 EJECTOR Articulated Trucks Machine Systems Brake Control Valve (Service)
795F AC and 795F AC XQ Off-Highway Truck Engine Supplement Guard (Engine Oil Pan) - Remove and Install
795F AC and 795F AC XQ Off-Highway Truck Engine Supplement Engine - Remove
795F AC and 795F AC XQ Off-Highway Truck Engine Supplement Engine - Install
Rework for the Implement Gear Pump {5055, 5070, 5073} Rework for the Implement Gear Pump {5055, 5070, 5073}
120K and 120K Series 2 Motor Graders Machine Systems Air Tank - Remove and Install
2008/12/08 Replacement Engines are Available for Legacy Machines {1000}
2009/01/19 A New Seal Kit Is Available for Backhoe Loaders {5051}