797 Off-Highway Truck Steering System Caterpillar


Relief Valve (Steering) - Test and Adjust - Backup Relief Valve

Usage:

797 5YW

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 ± 2 L/min (2.1 ± 0.5 US gpm) 时,备用安全阀的压力设定值是 27580 ± 345 kPa (4000 ± 50 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,必须拆下备用安全阀并在试验台上进行测试。




图 1g00569853

转向电磁阀和安全阀

(1) 进口

(2) 右前转向蓄能器的端口

(3) 右后转向蓄能器的端口

(4) 辅助动力装置(APU)的端口

(5) 转向控制阀的端口

(6) 调整螺钉

(7) 螺母

(8) 备用安全阀

可以在机器上进行安全阀的功能测试。

  1. 从端口 (2) ,端口 (3) 和端口 (5) 拆下液压油管路。

  1. 使用工具 (A) 封锁三个端口。

    注: 步骤 2 防止转向蓄能器在测试期间被充满。

    注: 端口 (1) 无须封锁。 位于端口 (1) 的单向阀用于防止机油回流至泵。

  1. 将工具 (A) 或工具 (B) 连接至端口 (4) 。 施加压力。

    注: 流量为 1.6 L/min (0.4 US gpm) 时,24000 至 25000 kPa (3480 至 3630 psi) 的压力读数为可接受的压力读数。 泵供油无法产生所要求的必要机油流量来精确检查备用安全阀。

按照下列步骤更改备用安全阀 (8) 的压力设定值:

    注: 备用安全阀 (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: 调整螺钉 (7) 转动一圈将使压力设定值变化 4730 kPa (686 psi)。

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