420E, 430E, 432E, 434E, 442E and 444E Backhoe Loaders Hydraulic and Steering System Caterpillar


Pilot System Pressure - Test

Usage:

432E BXE

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

压力下飞溅的油液,会造成人员伤亡。

带有压力的渗漏液体可能会穿透人体组织。 液体穿透进入身体会造成严重的人身伤害,甚至可能导致死亡。 即使是一个针孔大小的漏洞,也可能会引起严重的人身伤害。 如果液体喷射穿透您的皮肤,必须立即找熟悉这类型创伤的医生处置。

请使用木板或硬纸板作为挡板来检查渗漏。



注意

在检验、保养、测试、调整及维修发动机时,请小心确保盛接流出的液体。 在打开或拆解任何储有液体的部件之前,要准备好合适的容器收集液体。

有关适合收集和盛接卡特彼勒产品上的液体的工具和供应品,请参阅专门出版物, NENG2500, "卡特彼勒代理商工具目录"。

按照本地法规和条例处置所有液体。


执行任何测试前,释放液压系统中的压力并准备好机器进行故障诊断。 请参阅测试和调整, "液压系统压力 - 释放"。 执行任何测试前,目视检查机器是否漏油以及有无损坏的零部件。




    图 1g01226633

    (1) 先导系统歧管

    (2) 先导油压测试端口

  1. 将一个 8T-0856 压力表 安装到 177-7860 软管组件 上。 将软管的另一端安装到先导油压测试端口 (2) 上。

    注: 测试先导系统压力前,确保活塞泵处于最优压力。

  1. 起动发动机并在高怠速下运转。 失速运转装载机回路或反铲回路中的油缸。 压力读数必须为 3400 ± 500 kPa (500.0 ± 73.0 psi)。

  1. 关闭发动机,接合停车制动器。

  1. 如果先导系统压力不符合技术规格,必须更换反铲阀组上的减压阀。

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