834H Wheel Dozer and 836H Landfill Compactor Electrohydraulic System Caterpillar


Relief Valve (Main) - Test and Adjust

Usage:

834H BTX

表 1
所需工具    
工具     零件号     零件说明     数量    
A     测试仪表软管    
6V-4143 连接器 (1)     1    
177-7860 软管组件 (1)     1    
8T-4188 活接头套管 (1)     1    
6V-3966 接头 (1)     1    
B     测试仪表    
8T-0861 压力表 (1) (2)     1    
6V-4144 连接器 (1)     1    
( 1 ) 4C-4892 液压测试接头总成 的零件
( 2 ) 也可以使用 198-4240 数字压力指示器 。

------ 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。


  1. 通过完成所维修机器维修手册单元测试和调整, "机器故障诊断与排除准备工作"中规定的程序,执行机器测试准备工作。



    图 1g01098879

    机具泵测压口视图

    (1) 测压口

  1. 将测试仪表软管 (A) 安装到测压口 (1) ,并将测试仪表 (B) 连接到测试仪表软管 (A) 。

  1. 连接转向机架锁。

  1. 起动机器。

  1. 预热液压油至正常工作温度。

  1. 完全降下铲刀。

  1. 使提升控制杆返回保持位置。

  1. 升高发动机转速到高怠速。

  1. 将提升控制杆移到完全降下位置。 不要进入浮动状态。 将控制杆保持在此位置。

    注: 卸压压力每次保压的时间不要超过 30 秒。

  1. 记录测试仪表 (B) 的压力读数。

  1. 应当将主机具安全阀调整到以下压力:

    834H ... 29000 ± 340 kPa (4200 ± 50 psi)

    836H ... 24100 ± 340 kPa (3500 ± 50 psi)

    如果压力正确,继续执行步骤 16。

    如果压力读数不正确,通过执行以下程序调整主安全阀。




    图 2g00726270

    主安全阀的位置( 836H)

    (2) 锁紧螺母。 (3) 调整螺丝。

  1. 松开锁紧螺母 (2) 。

  1. 通过转动调整螺钉 (3) 调整压力设定。 顺时针转动调整螺钉提高压力设定值。 逆时针转动调整螺钉,以降低压力设定值。

  1. 拧紧锁紧螺母 (2) 。

  1. 根据需要,重复步骤 2 至 14。

  1. 确保铲刀位于地面上。

  1. 关闭发动机。

  1. 将测试仪表软管 (A) 和测试仪表 (B) 从机器上拆下。

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