797F Off-Highway Truck Steering System Caterpillar


Steering Control Valve - Adjust

Usage:

797F LAJ

表 1
所需工具    
工具     零件号     零件描述     数量    
A     5P-3032     液压测试适配器     1    
4F-7391 O 形密封圈     1    
8S-9191 螺栓     4    
1D-4717 螺母     4    
2P-1306 三通     1    
1P-5597 接头     2    
2P-8336 测试阀组件     2    
005-8615 管螺纹接头     1    
1P-5570 接头     1    
4J-0520 O 形密封圈     1    
8C-3206 对开凸缘     2    
8T-4196 螺栓     4    
8T-4121 硬垫圈     8    
B     8T-5320     液压测试总成     1    
C     9U-6600     手动液压泵     1    

在流量为 10 L/min (2.6 US gpm) 时,转向单向安全阀的压力设定值是 28000 ± 1025 kPa (4065 ± 150 psi)。

必须在试验台上测试转向控制阀,以实现每个转向单向安全阀的准确压力测试。 需要进行试验台测试以符合流量要求。




图 1g02012956

(1) 转向控制阀




图 2g02012955

(1) 转向控制阀

(2) 到左侧转向油缸的缸盖端的机油管路

(3) 到左侧转向油缸的连杆端的机油管路

可以在机器上进行转向单向安全阀的功能测试。 使用以下步骤测试转向控制阀 (1) 左转向端口中的转向单向安全阀。

  1. 从左转向油缸上拆下机油管路 (2) 。



    图 3g00940536

    安装在左转向油缸的工具 (A) 视图

  1. 将工具 (A) 安装到左转向油缸的缸盖端口。

    注: 当工具安装在机油管路和转向油缸之间时,工具 (A) 充当 T 形测试接头。

  1. 将机油管路 (2) 连接到工具 (A) 上。

  1. 起动发动机。

  1. 将卡车朝左方向一直转到底,直至到达转向限位。

  1. 停止发动机。

  1. 将来自工具 (B) 的压力表连接至工具 (A) 上的测试阀。

  1. 将工具 (C) 连接至工具 (A) 上的另一个测试阀。

  1. 操作工具 (C) 并加压转向系统。

  1. 记录打开转向单向安全阀的压力。 如果压力读数不在可接受的范围内,更换转向单向安全阀。

    注: 如果转向单向安全阀在流量为 1.6 L/min (0.4 US gpm) 且压力读数为 22500 ± 500 kPa (3275 ± 75 psi) 的情况下打开,则为可接受读数。 此读数可接受,因为泵供油不能产生足够的机油来精确检查转向单向安全阀。

  1. 从左转向油缸上拆下所有工具。

  1. 将机油管路 (2) 重新安装到左转向油缸上。

  1. 从左转向油缸上拆下机油管路 (3) 。

  1. 将工具 (A) 安装到左转向油缸的连杆端端口。

  1. 对右转向单向安全阀重复步骤 3 至步骤 12。

    注: 对于步骤 5,将卡车朝右方向一直转到底,直至到达转向限位。

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