C7.1 Engines for Caterpillar Built Machines Caterpillar


Air in Fuel - Test

Usage:

525D 2L5

表 1
所需工具 
工具  零件号  零件描述  数量 
2P-8278  目测表 


注意

请确保对燃油系统进行的所有调整和修理均由经过适当培训的授权人员执行。

在燃油系统上开始任何工作之前,请参阅操作和保养手册, "一般危险信息和高压燃油管路"以了解安全信息。

有关在所有燃油系统工作期间必须遵循的清洁度标准的详细信息,请参阅系统操作、测试和调整, "燃油系统部件清洁度"。



注意

发动机停止操作后,低压燃油系统仍可加压一段时间。 低压燃油系统的操作压力可达 500 kPa (73 psi)。 Caterpillar 建议在对低压燃油系统进行任何保养前,应首先排空燃油细滤器。


注: 请确保将工具加以护盖存放在适当的位置。 请将工具存放在干净的塑料袋中。

  1. 请确保燃油箱中的燃油油位在燃油箱中吸入管的水平之上。

  2. 彻底检查燃油系统有无泄漏。 如有必要,请修理燃油系统。

  3. 检查所有从燃油箱伸出的低压燃油管有无阻塞。 更换任何损坏的部件。

  4. 充注燃油系统。 参考操作和保养手册, "燃油系统 - 充注"以了解正确步骤。

  5. 起动发动机。 有关正确步骤,请参阅操作和保养手册, "起动发动机"。 检查问题是否已解决。 使发动机在低怠速下运转 5 分钟。

  6. 停止发动机。 有关正确步骤,请参阅操作和保养手册, "关闭发动机"。


    图 1g03347228
    典型实例

  7. 如有必要,从固定夹上拆下低压燃油管。 从燃油细滤器底座和输油泵的进口接头上拆下低压燃油管 (1)。

    注: 确保低压燃油管未变形。

  8. 在输油泵与辅助燃油滤清器底座之间连接工具 (A)、适当的管组件和接头。 确保工具 (A) 牢固且远离旋转部件。

  9. 充注燃油系统。 参考操作和保养手册, "燃油系统 - 充注"以了解正确步骤。

  10. 起动发动机。 有关正确步骤,请参阅操作和保养手册, "起动发动机"。 有关测试燃油中空气的步骤,请参阅步骤 10.a 至 10.d。

    1. 在低怠速下运转发动机。


      图 2g00578151
      2P-8278 管组件 (目测表)的典型示例

    2. 运转发动机 2 分钟。 流经目测表的燃油中应没有空气。 间隔超过 2.5 cm (1.0 in) 的小气泡可以接受。 测试燃油中的空气期间,请勿对连接件进行操作。

    3. 存在大气泡或成串气泡表示有泄漏。

    4. 调查可能的泄漏并排除低压燃油系统中任何可能的泄漏。 检查燃油箱与输油泵进口之间的泄漏。 如有必要,更换低压燃油管。

  11. 拆下工具 (A)、适当的管组件和接头。 重新连接低压燃油管。

  12. 充注燃油系统。 参考操作和保养手册, "燃油系统 - 充注"以了解正确步骤。

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