301.4C Mini Hydraulic Excavator Caterpillar


Compression - Test

Usage:

301.4C LJ3

表 1
所需工具    
零件号     零件名称     数量    
9U-6274     压缩测试工具总成     1    

以下情况可影响油缸压缩测试的结果:

  • 蓄电池

  • 起动马达的情况

  • 环境情况

  • 压缩表的质量




图 1g02700596

检查发动机的压缩

  1. 拆下喷油器管路和喷嘴。

  1. 将喷油泵设置为零输油(断开燃油切断电磁阀)

  1. 转动发动机。

  1. 在要测量的气缸上安装压缩压力表。

  1. 使用起动马达转动发动机 读取压力表上的压力。

  1. 如果测量值处于极限或极限之下,请对发动机进行大修。

    表 2
        组装时的标准值     修理限值    
    压缩压力 (1)    
    34.3 ± 1 bar (497 ± 15 psi)    

    27.5 ± 1 bar (399 ± 15 psi)    
    ( 1 ) 压缩压力在 250 rpm 时测量。


注意

确定要测量到所有气缸的压缩。没有检查所有气缸可能会导致错误的诊断结果。压缩压力是随着发动机转速变化的。因此有必要在对所有气缸进行压缩的读数时保证发动机转速不变。


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