572R Series II Pipelayer Hydraulic System Caterpillar


Main Relief Valve - Test and Adjust

Usage:

572R II DSC

简介

主安全阀控制系统中允许的最大压力。 主安全阀保护液压元件避免受到高压峰值可能造成的损坏。 主安全阀位于操作室内地板下方的动臂和吊钩控制阀中。 执行以下步骤,以确保主安全阀设置准确。



图 1g00488925
主安全阀的位置

所需工具



图 2g01089423
工具 (A)


图 3g01089425
工具 (B)( 6V-7830 压力 (四仪表组))

表 1
所需工具 
工具  项目  零件
编号 
说明  数量 
A1  8T-0852  压力表
40000 kPa (5800 psi) 
A2 6V-3989  接头 
A3 6V-4143  连接器 
A4 177-7861  软管组件
41370 kPa (6000 psi) 
B1  8T-0862  压力表
500 kPa (72 psi) 
B2 8T-0860  压力表
40000 kPa (5800 psi) 
B3 8T-0855  压力表
4000 kPa (580 psi) 
B4 6V-3081  软管组件
41500 kPa (6020 psi) 
B5 4S-6399  接头 
B6 6V-4144  连接器 
C1  6V-9507  塞 
C2 4J-5477  O 形密封圈 
C3 6V-9828  盖组件 

测试步骤

  1. 把机器开到平整水平的地方。 移到远离工作的机器和人员的地方。

  2. 机器上仅允许留一位操作员 让其他所有人员远离机器或在操作员的视野范围内。

  3. 接合停车制动器。

  4. 完全收回配重。

  5. 停止发动机。

  6. 拆下地板。

  7. 拆下绞盘上方的护板,以便靠近吊钩绞盘马达上的组合阀。


    图 4g00488644
    吊钩绞盘的组合阀
    (BR) 制动器释放端口

  8. 断开制动器释放管路与吊钩绞盘马达上的组合阀弯头。 使用工具 (C1 和 C2) 来插入软管。 使用工具 (C3) 盖住制动器释放端口 (BR) 中的弯头。


    图 5g01304023
    (HA) 泵压力口
    (HB) 泵的信号压力
    (5) 压力补偿器滑阀
    (8) 流量补偿器滑阀

  9. 将工具 (A 或 B) 连接到泵压力端口 (HA)。


    图 6g00866789
    压力补偿器滑阀在泵控制阀中
    (3) 调整螺钉
    (4) 弹簧
    (5) 压力补偿器滑阀
    (6) 盖
    (7) 锁紧螺母

  10. 通过顺时针转动两整圈来调整主液压泵上的压力补偿器滑阀 (5),以将切断压力提高到主安全压力以上。

  11. 固定调整螺钉 (3) 并松开锁紧螺母 (7)。 顺时针转动调整螺钉 (3) 可增大压力。

  12. 起动发动机。 将液压油预热至温度为 65° ± 3°C (149 ° ± 5 °F)

  13. 以高怠速运转发动机。

  14. 将吊钩控制移到降下位置。

  15. 检查工具 (A 或 B) 上的压力。 工具 (A 或 B) 处的压力应为 33100 ± 700 kPa (4800 ± 100 psi)

  16. 如果工具 (A 或 B)上的压力不在规定限制内,则需执行以下调整步骤。

  17. 测试完成或进行任何调整后,将压力补偿器滑阀 (5) 返回到原始设置。

调整步骤



    图 7g01306302

  1. 固定调整螺钉 (8) 并松开锁紧螺母 (9)。 顺时针转动调整螺钉 (8) 可增大压力。 逆时针转动调整螺钉 (8) 可减小压力。

  2. 当压力设定值正确时,用六角扳手握住调整螺钉 (8) 并拧紧锁紧螺母 (9)。

  3. 重复测试步骤。 确保工具 (A 或 B) 处的压力为 33100 ± 700 kPa (4800 ± 100 psi)

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