992K Wheel Loader Electrohydraulic System Caterpillar


Pressure Reducing Valve Pressure for Dead Engine Pilot Supply (Engine OFF) - Test and Adjust

Usage:

992K H4C

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

机器的突然移动或意外起动会对机器上或附近的人员造成人身伤亡。

为了防止人身伤亡,进行以下操作:

将机器放在光滑、水平的表面上。

将作业机具降至地面,并接合停车制动器。

停止发动机,拔下钥匙。

锁止车轮并安装转向机架锁。


表 1
所需工具    
零件号     说明     数量    
8T-0850     压力表     1    
1U-5482     压力适配器总成     1    

熄火发动机的先导油由提升液压回路中的油供应。 当发动机停机时,先导油用于将机具降至地面。 减压阀将提升油缸中的高压油降至减压后的先导油压力。 减压后的先导油压力必须低于先导泵油压力。




图 1g01469865

机具压力诊断板

(1) 先导油测压口(熄火发动机)。

  1. 连接转向机架锁连杆。

  1. 8T-0850 压力表 (4000 kPa (580 psi))连接至歧管上的测压口 (1) 。

  1. 接合停车制动器。

  1. 将变速箱挂入空档。

  1. 起动发动机。 将液压油加热到大约为 49 至 65°C (120 至 150°F) 的正常工作温度。

  1. 将动臂抬离地面。

  1. 关闭发动机。 记录压力表读数。

  1. 接通钥匙起动开关,然后将机具降至地面。

  1. 熄火发动机的先导油压力应为 1580 ± 150 kPa (230 ± 22 psi)。

  1. 如果熄火发动机的先导油压力不正确,必须调整压力控制阀。



    图 2g01469875

    左侧机具主控制阀

    (2) 减压阀

    (3) 锁紧螺母

    (4) 压力调整螺钉

  1. 松开锁紧螺母 (3) 。

  1. 顺时针转动调整螺钉 (4) ,升高熄火发动机的先导油压力。

  1. 拧紧锁定螺母。

再次执行测试和调整, "熄火发动机先导供油的减压阀压力(发动机停机)- 测试/调整",以便确认新的设定。

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