770G and 772G Off-Highway Truck Systems Caterpillar


Service Brakes and Retarder 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。


  1. 将变速箱控制器置于停车(PARK)位置。 变速箱置于停车位置将接合停车制动器。



    图 1g02422436

    (1) 左手侧后松紧调整器测压口。

    (2) 右手侧后松紧调整器测压口。

  1. 198-4240 数字压力指示灯 安装到左手侧后松紧调整器的测压口 (1) 上。

  1. 198-4240 数字压力指示灯 安装到右手侧后松紧调整器的测压口 (2) 上。



    图 2g02422437

    (3) 前制动器测压口。

  1. 198-4240 数字压力指示灯 安装到测压口 (3) 上。

  1. 起动发动机。 以低怠速运转发动机。

  1. 将缓速器操纵杆移至断开位置。 放加行车制动器。 此时应该显示以下压力:

    • 后松紧调整器处的机油压力应当为 6065 ± 345 kPa (880 ± 50 psi)。

    • 前测压口处的油压应为 7000 ± 690 kPa1015 (± 100 psi)。

  1. 释放行车制动器。

  1. 将缓速器操纵杆移至完全接通位置。 此时应该显示以下压力:

    • 后松紧调整器处的机油压力应当为 5000 ± 690 kPa (720 ± 100 psi)。

    • 前测压口处的机油压力应为 0 kPa (0 psi)。

  1. 将缓速器操纵杆移至断开位置。

  1. 关闭发动机。

注: 执行液压系统的系统操作/测试和调整, "松紧调整器 - 测试和调整",以确定每个车轮处的压力。

------ 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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