770G and 772G Off-Highway Truck Power Train Caterpillar


Transmission Lubrication Oil Pressure - Test

Usage:

770G ECM



图 1g02420546

770G 上的变速箱左侧视图

(1) 润滑安全阀

(2) 变速箱润滑油测压孔




图 2g02420622

772G 上的变速箱左侧视图

(1) 润滑安全阀

(2) 变速箱润滑油测压孔

注: 在您进行任何压力测试之前,确保滤清器和滤网清洁。 在您进行本测试之前,确保油处于工作温度。

表 1
所需工具    
项目     零件号     说明     数量    
A     198-4240 (1)     数字压力指示器     1    
( 1 ) 同时提供 1U-5481 压力表总成 。

------ WARNING! ------

机器突然移动,会造成人员伤亡。

机器突然移动或释放气压或油压,可能对机器上或机器附近的人员造成伤害。

在测试和调整任何空气系统或液压系统之前,为防止可能的伤害,执行测试和调整, "概述"部分的程序。


该测试将检查变速箱润滑回路中的机油压力是否正常。

步骤

  1. 执行以下测试之前,请参考测试和调整, "一般信息"。

  1. 将工具 (A) 连接到测压口 (2) 上。

  1. 确保变速箱控制装置处于"停车"位置

  1. 起动发动机。

  1. 将变速箱操纵杆移入"空档"位置。 参考图表2 以取得正确的压力。

    表 2
    变速箱润滑压力    
    发动机转速(RPM)     机油压力    
    700    
    20.5 ± 14 kPa (3 ± 2 psi)    
    2200    
    172 ± 34 kPa (25 ± 5 psi)    

  1. 当本测试完成后,关闭发动机,卸下测试设备。

问题

变速箱充油泵段的压力正确,但变速箱润滑油压力过低。

可能的原因

  • 变速箱润滑安全阀开启。

  • 变速箱润滑回路泄漏量过大。

问题

正常运行期间机油过热。

可能的原因

  • 变速箱外壳中机油过多。 请参考动力传动系测试和调整, "变速箱故障排除"。

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