390F Excavator Machine Systems Caterpillar


Pilot Valve (Travel) - Remove and Install

Usage:

390F B37

拆卸步骤

表 1
所需工具    
工具     零件号     零件描述     数量    
A     -     Loctite 271     -    

开始:

  1. 释放液压系统压力。

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

滚热的油或液压油的压力会对人员造成伤害。

发动机停机之后,液压油的压力仍会保留在液压系统里。 对液压系统进行维修之前,如果不事先释放压力,可能会造成严重伤害。

卸下液压系统的部件或管路时,确保所有的作业机具都已降到地面上,而且液压油温度已冷。 只能在发动机停机,并且加注口盖冷却到可以用徒手触摸时才能卸下加注口盖。





    图 1g03654324

  1. 拆下螺栓 (1) 和板组件 (2) 。



    图 2g02155366

  1. 将软管组件 (5) 和线束组件 (3) 从先导阀 (4) 上断开。

  1. 拆下压力开关 (6) 。

    注: 为便于安装,标记接头 (7) 的位置。 两个接头 (7) 的下部有一个滤清器。

  1. 拆下两个接头 (7) 。



    图 3g02155367

  1. 从行驶踏板开始,重新定位地板垫 (11) 。

  1. 拆下盖 (9) 。

  1. 拆下螺栓 (10) 和杆组件 (8) 。



    图 4g02155368

  1. 拆下螺栓 (20) 和先导阀 (4) 。

安装步骤

  1. 按与拆卸相反的顺序安装先导阀 (4) 。

    1. 拧紧螺栓 (12) 至扭矩为 24 ± 3 N·m (212 ± 27 lb in)。

    1. 拧紧螺栓 (10) 至扭矩为 33 ± 3 N·m (24 ± 2 lb ft)。

    1. 拧紧接头 (7) 至扭矩为 24 ± 3 N·m (212 ± 27 lb in)。

    1. 将压力开关 (6) 拧紧至扭矩为 64 ± 3 N·m (47 ± 2 lb ft)。

    1. 将工具 (A) 涂抹到螺栓 (1) 的螺纹上。

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