M325D L MH and M325D MH Material Handlers Hydraulic System Caterpillar


Relief Valve (Pilot) - Test and Adjust

Usage:

M325D MH EDF

表 1
所需工具    
零件号     说明     数量    
8T-0856     压力表 ( 0 至 6,000 kPa (0 至 870 psi))     1    

  1. 将机器停放在平地上。

  1. 停止发动机。

  1. 释放液压系统压力。 请参阅测试和调整, "液压系统压力 - 释放"。



    图 1g01953305

    先导油歧管腔室

    (1) 测压口

    (2) 锁紧螺母

    (3) 调整螺钉

  1. 将一块 6000 kPa (870 psi) 压力表连接至测压口 (1) 。

    注: 您的发动机上可能需要安装测压口 (1) 。

  1. 起动发动机。

  1. 将机器控制装置设为以下设置:发动机转速旋钮 "10" 和 AEC 开关 OFF。 有关发动机转速设定,请参阅测试和调整, "发动机性能 - 测试(发动机转速)"。

  1. 将液压油温度提高至 55°± 5°C (131°± 9°F)。

  1. 检查测压口 (1) 处的先导卸压阀设定。

  1. 先导安全阀设置应为 4100 ± 200 kPa (595 ± 30 psi) 。 如果先导安全阀设定不在技术规范范围内,请调整先导安全阀。

  1. 如需调整先导安全阀,请松开锁紧螺母 (2) 。

  1. 旋转调整螺钉 (3) ,直到测压口 (1) 的压力表读数达到 4100 ± 200 kPa (595 ± 30 psi)。

    注: 顺时针旋转调整螺钉 (3) 将升高压力。 逆时针旋转调整螺钉 (3) 将降低压力。

    注: 压力升高时,务必进行最终压力调整。

  1. 拧紧锁紧螺母 (2) ,扭矩为 49 ± 4.9 N·m (36 ± 4 lb ft)。

注: 进行压力调整需要发动机和先导泵正常工作。 如果压力调整的结果不正确,则需要检查发动机和泵的特性曲线。

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