3524B Engines for Off-Highway Trucks Caterpillar


Engine Stalls at Low RPM

Usage:

3524B 1AW

可能的原因

  • 单体喷油器

  • 燃油供给

  • 空气切断阀(若适用)或供气不畅

  • 发动机低怠速

  • 附属设备

建议措施

单体喷油器

  1. 检查电子控制模块(ECM)连接器 J1/P1 和 J2/P2 是否正确安装。 检查单体喷油器的连接器是否正确安装。 请参考故障诊断和排除 , "检查电气连接器 "部分。

  2. 使用卡特彼勒电子技师(ET)进行 "喷油器电磁阀测试",以确定 ECM 是否向所有喷油器电磁阀都励磁。

  3. 使用卡特彼勒 ET 进行"断缸测试",以找出不能点火的气缸。 有关正确的程序,请参考 故障诊断和排除 , "喷油器电磁阀 "部分。

燃油供给

  1. 检查燃油压力。 有关正确的程序,请参考 系统操作/测试和调整 手册。

  2. 检查燃油管路有无以下问题: 堵塞, 管路弯折 和 管路挤压 . 如果发现燃油管路有问题,请修理和/或更换管路。

  3. 检查油箱中有无会阻塞供油的异物。


    注意

    持续盘车不要超过30秒。 再次盘车前,让起动马达先冷却2分钟。


  4. 如果执行了以下任一步骤,则向燃油系统充油:

    • 更换燃油滤清器

    • 维护低压供油油路

    • 更换单体喷油器

    注: 供油管路上的观察窗有助于诊断燃油中有无空气。

  5. 低温天气会对燃油特性造成不良影响。 有关改善低温操作条件下燃油特性的信息,请参考相应的 操作和保养手册 。

  6. 盘动发动机时,检查流经燃油滤清器之后的燃油压力。 有关正确的压力值,请参考 系统操作/测试和调整 手册。 如果燃油压力低,请更换燃油滤清器。 如果更换后燃油压力仍然偏低,请检查以下各项: 输油泵, 输油泵的连接 和 燃油压力调节阀 .

空气切断阀(若适用)

  1. 确认空气切断阀已打开。

  2. 检查进气系统中有无堵塞。 有关进气系统的信息,请参考 系统操作/测试和调整 手册。

低怠速

检查低怠速设置。

附属设备

检查所有附属设备有无可能引起发动机超负荷的问题。 修理或更换所有损坏的部件。

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