797F and 797F XQ Off-Highway Truck/Tractor Braking System Caterpillar


Pressure Reducing Valve (Pilot Oil) - Test and Adjust

Usage:

797F LAJ

------ 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。



注意

在进行检验、保养、测试、调整及维修产品期间,必须小心以确保装好排放出的油液。 在打开任何舱室或解体任何储有液体的部件之前,要准备好合适的容器收集液体。

有关收集和盛接 Cat 产品上油液的适用工具和用品,请参阅专门出版物, NENG2500, "代理商维修工具目录"。

按照当地法规和要求处置所有液体。


表 1
所需工具     数量    
177-7861 软管组件     1    
6V-4143 连接器组件     2    
8T-0857 压力表 (
10000 kPa (1450 psi))    
1    

该测试涉及下述阀的设置:

  • 控制阀(制动器冷却、举倾)先导油减压阀




图 1g02001133

(1) 控制阀(制动器)

(2) 减压阀(先导油)

减压阀(先导油) (2) 位于控制阀(制动器) (1) 上。 控制阀(制动器) (1) 位于机器左侧卡车车斗下方。




图 2g02006316

(3) 控制阀(制动器冷却、举倾)

(4) 控制阀(制动器冷却、举倾)先导油测压口

  1. 8T-0857 压力表 (0 至 10000 kPa (0 至 1450 psi)) 将软管组件连接到测压口 (4) 。

  1. 起动发动机。 使制动蓄能器完全充注。

  1. 以低怠速运转发动机。



    图 3g02004757

  1. 将举倾机构操纵杆 (A) 移到保持位置。

  1. 记录压力表上的压力读数。

    注: 减压阀(先导油) (2) 的正确压力设置为 3790 ± 345 kPa (550 ± 50 psi)。

  1. 如果压力设置需要调整,停运发动机。



    图 4g02001196

    (2) 减压阀(先导油)

    (5) 锁紧螺母

    (6) 调整螺钉

  1. 松开减压阀(先导油) (2) 的锁紧螺母 (5) 。

  1. 顺时针旋转调整螺钉 (6) 1/4 圈,以升高压力。 逆时针旋转调整螺钉 (6) 1/4 圈,以降低压力。

  1. 重复步骤 2 到步骤 8,直到获得正确的压力设置。

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