Service Brake Pressure Is Low
问题：行车制动器和减速器驱动压力超出技术规格
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| 可能的部件根源 | 非部件根源 | 如何诊断 | 修正措施 |
|---|---|---|---|
| 前/后 ARC 电磁阀 | 污染 | 执行制动系统压力检查。 如果踏板先导压力和继电器弹簧偏置量正确，但是带手动减速器的制动器压力或 ARC 压力不正确，则前或后 ARC 电磁阀可能存在问题。 | 用新 ARC 电磁阀进行维修。 确保机油为 ISO 18/15 或更高等级。 |
| 继电器阀（前/后行车制动器） | 污染 调整不当 |
执行制动系统压力检查。 松紧调节器处的压力应比制动踏板先导压力低 240 +/- 35 kPa（35 +/- 5 psi）。 如果继电器阀上的弹簧偏置量过高，制动器压力将偏低。 （如果安装了 XLP 机组，则前制动器松紧调节器压力将低于制动踏板压力 193 +/- 35 kPa。） | 用继电器阀（行车制动器）套件进行维修。 确保机油为 ISO 18/15 或更高等级。 |
| 制动踏板阀 | 污染 | 执行制动系统压力检查。 制动踏板先导压力必须符合技术规格。 | 用新踏板阀进行维修。 确保机油为 ISO 18/15 或更高等级。 |
| 制动器组件（密封件损坏） | 过量增压 | 单独接合减速器和行车制动器并测量制动器组件处的压力。 四个压力应全部在公差范围内。 | 如果一个或多个制动器组件低于其他组件，进行更换。 检查密封件有无损坏。 |
Caterpillar Information System:
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