C3.3B and C3.8 Engines for Caterpillar Built Machines Caterpillar


Engine Overspeeds

Usage:

299D3XHP AN9
使用本步骤排除发动机超速故障,或在以下事件代码为现行状态时使用本步骤。 关于事件代码的信息,请参阅故障诊断与排除, "事件代码"。 关于发动机监控系统的信息,请参阅故障诊断与排除, "发动机监控系统"。

注: 以下某些代码可能不适用于特定的应用。

表 1
诊断代码表 
J1939 代码  代码说明  状况存在  注释 
190-0  发动机超速  钥匙开关接通
发动机转速为 3500 RPM 或以上 
发动机停止
警告级别 3 

可能原因

  • 涡轮增压器工作不正常

  • 进气

  • 燃油错误

  • 进气口中的可燃气体

建议的措施

注: 下面以概率的先后顺序列出了这些步骤。 依次完成这些步骤。

表 2
故障诊断与排除测试步骤  数值  结果 

1. 现行代码和记录的代码

A. 在 Caterpillar 电子技师(ET)和电子控制模块(ECM)之间建立通信。 如有必要,请参阅故障诊断与排除, 电子维修工具。

B. 在执行任何故障诊断与排除或清除故障诊断代码前,从发动机 ECM 下载"产品状态报告"。

注:在继续执行本步骤之前,诊断并排除所有现行代码。
 

代码
 

结果:存在现行代码。

在继续执行本步骤之前,诊断并排除所有现行代码。

结果:无现行代码。

转至测试步骤 2。
 

2. 涡轮增压器的正常工作

A. 检查涡轮增压器是否正常工作。

B. 检查是否有任何机油漏入进气口中。
 

涡轮增压器
 

结果:涡轮增压器中的机油漏入进气口中。

修理或更换涡轮增压器。

结果:涡轮增压器中的机油没有漏入进气口中。

转至测试步骤 3。
 

3. 检查发动机机油油位并获取机油油样

A. 检查机油油位并获取机油油样。 如果机油油位高,则采集油样以检查燃油是否稀释。 如果存在燃油,请参阅故障诊断与排除, 机油含有燃油。
 


 

结果:发动机机油油样显示需要采取行动。

进行必要的修理。

结果:发动机机油油样和机油油位正常。

继续测试步骤 4。

结果:发动机机油油位不正确。

确定机油油位偏高或偏低的根源。
 

4. 进气

A. 检查周围有无可燃气体。
 

空气质量
 

结果:大气中含有可燃气体。

不要在有可燃气体的环境中运转发动机。
 

5. 检查燃油质量

有关更多信息,请参阅系统操作, 燃油系统。

A. 检查燃油质量。 请参阅测试和调整, 燃油质量 - 测试,了解正确的步骤。 检查燃油箱中有无可能会堵塞燃油供应的碎屑或异物。
 

燃油系统
 

结果:燃油系统不正常。

进行必要的修理。

将发动机重新投入使用。
 

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