773D Off-Highway Truck Steering System Caterpillar


Relief Valve (Primary Steering Backup) - Test and Adjust

Usage:

773D NBJ

表 1
所需工具     数量    
8T-0860 压力表 (
40000 kPa (5800 psi))    
1    

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

如果有人被困在车轮和车架之间,可能会发生人身伤亡。

转向系统由液压控制,运动时,车轮可能挤压人员。

当在车轮和车架之间工作时,一定要小心。 如果必须转向车轮,在进行任何移动前,确保所有人员远离机器。





图 1g00527082

(1) 转向单向阀和安全阀

(2) 主转向备用安全阀

(SS) 转向系统测压口

转向单向阀和安全阀 (1) 位于右前悬架油缸后面。




图 2g00527098

(3) 转向活塞泵

(4) 压力补偿器阀

(5) 高压切断阀

转向活塞泵 (3) 位于变矩器左侧的发动机后面。

  1. 高怠速运行发动机。 向左或向右转动方向盘,直到接触转向油缸挡块。 之后,紧靠挡块继续转动方向盘。 将方向盘固定到此位置 3 秒后松开方向盘。 继续执行此步骤,直到转向系统内的油温达到至少 38 °C (100 °F)。

  1. 关闭发动机。

  1. 8T-0860 压力表 40000 kPa (5800 psi) 安装在转向系统的测压口 (SS) 。 测压口 (SS) 位于右前悬架油缸后面的转向单向阀和安全阀 (1) 上。



    图 3g01332333

    (4) 压力补偿器阀

    (5) 高压切断阀

    (6) 螺母

    (7) 锁紧螺母

    (8) 设定螺钉

    注: 主转向备用安全阀 (2) 具有高于高压切断阀 (5) 的压力设置值。

  1. 将螺母 (6) 从高压切断阀 (5) 的设定螺钉 (8) 上拆下。

  1. 松开高压切断阀 (5) 的锁紧螺母 (7) 。

    注: 不要过于提高安全阀的压力设定值。 如果安全阀的压力设定值过高,可能会损坏系统部件。

  1. 通过顺时针转动设定螺钉 (8) ,增加高压切断阀 (5) 的压力设定值。 转动设定螺钉 (8) 约 1 圈半,将增加高压切断阀的压力设定值,使其超过主转向备用安全阀的压力设定值。 请记住转动圈数,以便使设定螺钉 (8) 返回原始设定。

  1. 起动发动机。

  1. 在低怠速下运转发动机。 检查压力表上的压力读数。 主转向备用安全阀 (2) 的压力设定值是 25500 ± 300 kPa (3700 ± 45 psi)。

  1. 如果压力需要调整,停运发动机。



    图 4g00526792

    (2) 主转向备用安全阀

    (9) 锁紧螺母

    (10) 设定螺钉

  1. 松开主转向备用安全阀 (2) 的锁紧螺母 (9) 。

  1. 利用内六角扳手顺时针转动设定螺钉 (10) 1/4 圈,以升高压力。 逆时针转动设定螺钉 (10) 1/4 圈,以降低压力。 设定螺钉 (10) 每转 1/4 圈,压力变化约为 1575 kPa (230 psi)。

  1. 重复步骤 7 到 11,直到压力设定值正确为止。

  1. 当主转向备用安全阀 (2) 的压力设定值正确时,将高压切断阀 (5) 的压力设定值调回原始压力设定值。

    1. 将设定螺钉 (8) 转至原来的设定值。

    1. 拧紧锁定螺母 (7) 。

    1. 安装螺母 (6) 。

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