G3512 Generator Set Engines Caterpillar


Prelubrication Pump Problem

Usage:

G3512 E26
使用此步骤对低预润滑油压力进行故障诊断与排除。 此外,如果以下任一事件代码为激活或记录状态,应使用本步骤。

表 1
J1939 代码和描述  注释 
3551-17
发动机机油充注状态:低 - 最低严重程度 (1) 
发动机将无法起动。
记录该代码。 

可能原因

  • 代码

  • 机油油位

  • 空气系统

  • 做功

  • 预润滑泵

建议的措施

表 2
故障诊断与排除测试步骤  数值  结果 

1. 检查代码

A. 连接 Cat® 电子技师 (ET) 与维修工具接头。

B。 查找与事件代码系统相关的现行代码。
 

代码
 

结果:相关代码为现行状态。

修理:在继续进行此测试前,诊断并排除所有相关代码。

结果:代码激活或被记录。

转至测试步骤 2。
 

2. 检查发动机机油油位
 

机油油位
 

结果:机油油位不低。

转至测试步骤 3。

结果:机油油位低。

修理:执行下述步骤:

1. 添加发动机机油。 有关发动机机油的建议,参考操作和保养手册, "发动机机油"。

2. 起动发动机。 检查发动机外部是否漏油。 修理漏油处。

3. 检查发动机外部是否漏油。 修理漏油处。

如果故障未得到排除,则转至测试步骤 3。
 

3. 检查预润滑泵的空气系统

A. 检查空气操纵预润滑泵的以下各项:

- 供气压力
- 润滑器加注有正确的油液
- 排气阻力
 

空气系统
 

结果:预润滑泵空气系统正常。

继续测试步骤 4。

结果:预润滑泵空气系统不正常。

如果故障未得到排除,则转至测试步骤 4。
 

4. 检查预润滑泵电机的电源

A. 确保预润滑泵接线正确。 有关更多信息,请参阅故障诊断与排除, "电磁阀 - 测试"。
 

做功
 

结果:泵在需要时通电。

继续测试步骤 5。

结果:泵在需要时未通电。

修理:修理或更换损坏的电气部件。

如果故障未得到排除,则转至测试步骤 5。
 

5. 检查预润滑泵压力是否不足

A. 连接 Cat ET。

B。 预润滑循环期间,使用 Cat ET 监测以下参数:

- "发动机机油压力"

注:盘动发动机前,ECM 在编程的"发动机准备起动预润滑持续时间"内必须检测到 41 kPa (6 psi) 的机油压力。
 

压力
 

结果:压力不正常。

修理:修理或更换损坏的预润滑泵。

确认修理后故障得到排除。
 

如果以上步骤未解决问题,请联系当地 Cat 代理商的技术通信员(TC)。 如需进一步的帮助,您的 TC 可以通过代理商解决方案网络(DSN)与您交谈。

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