770G and 772G Off-Highway Truck Systems Caterpillar


Secondary Brake System Pressure Test

Usage:

770G ECM

表 1
所需工具    
零件号     零件描述     数量    
3J-1907     O 形密封圈     2    
177-7862     软管组件     2    
6V-3965     螺纹接头     2    
6V-4143     连接器组件     4    
198-4240     数字压力指示器     1    

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

机器移动会造成人员伤亡。

将挡块放在车轮前后,以确保停车制动器未接合时,机器不会移动。


------ 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。





    图 1g02422476

    (1) 机器后部测压口

  1. 在发动机关闭且停车制动器接合的时候将 198-4240 数字压力指示灯 安装到机器后部的测压口 (1) 。

  1. 起动发动机。 运转发动机,预热制动器机油,直到制动器机油温度达到 82° ± 10°C (180° ± 20°F)。

  1. 当发动机处于低忌速时,完全接合行车制动器,并将齿轮选择器移至空档位置。

    • 测压口 (1) 处的辅助制动器压力应升高至 5033 ± 690 kPa (730 ± 100 psi)。

  1. 在档位选择器处于空档位置的情况下,完全踏下辅助制动踏板。

    • 测压口 (1) 处的辅助制动器压力应降至低于 140 kPa (20.0 psi)。

  1. 完全松开辅助制动踏板。

  1. 当行车制动器踏板完全集合,并且档位选择器处于空档位置时,关停发动机。

    注: 利用地面紧急停机开关来关停发动机。

    • 测压口 (1) 处的辅助制动器压力应保持高于 3800 kPa (550.0 psi) 持续一分钟。

  1. 完全踏下辅助制动踏板。

    • 测压口 (1) 处的辅助制动器压力应低于 140 kPa (20.0 psi)。

  1. 将齿轮选择器移至停车位置,释放辅助制动器踏板和行车制动器踏板。

  1. 关闭发动机。

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

机器突然移动,会造成人员伤亡。

突然移动车辆或释放油压会伤害车上或附近的人员。 为了防止受伤,测试和调整液压系统前,执行测试和调整, "概述"部分内的程序。


注: 确保从液压制动系统中排出全部空气。 有关步骤,请参考测试和调整, "制动器系统空气 - 排气"。

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