793F and 793F XQ Off-Highway Truck Hydraulic Fan and Steering System Caterpillar


Relief Valve (Steering) - Test and Adjust

Usage:

793F D3T

表 1
所需工具    
工具     零件号     零件描述     数量    
A     8T-5320     液压测试总成     1    
B     9U-6600     手动液压泵     1    
C     3S-6224     电动液压泵     1    

在流量为 8 L/min (2 US gpm) 时,转向安全阀的压力设定值是 26000 ± 400 kPa (3775 ± 60 psi)。 转向系统中的其它部件将阻止压力到达此数值。 利用试验台测试以实现准确的压力测试。 在进行任何调整之前,必须拆下转向安全阀并在试验台上进行测试。




图 1g01500878

左梁内侧上的转向电磁阀和安全阀的位置




图 2g00281966

转向电磁阀和安全阀

(1) 前转向蓄能器的端口

(2) 辅助动力装置(APU)的端口

(3) 中央和后转向蓄能器的端口

(4) 进口

(5) 转向控制阀的端口

(6) 调整螺钉

(7) 螺母

(8) 转向安全阀

按照下列程序更改转向安全阀 (8) 的压力设定值。

    注: 转向安全阀 (8) 必须在试验台上进行调整。

  1. 松开螺母 (6) 。

  1. 顺时针转动调整螺钉 (7) 以增大压力设定值。

    1. 逆时针转动调整螺钉 (7) 以减小压力设定值。

      注: 固定螺钉 (7) 转动一圈将使压力设定值变化 4728 kPa (685 psi)。

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