Relief Valve (Brake Oil Cooler) - Test and Adjust
底盘中测试和调整步骤
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| 所需工具 | ||
|---|---|---|
| 零件号 | 说明 | 所需数量 |
| 198-4240 | 数字压力指示器 | 1 |
| 2J-5608 | 罩盖 | 1 |
| 4J-0527 | O 形密封圈 | 1 |
注: 在您进行任何压力测试之前，确保滤清器和滤网清洁。 在您进行本测试之前，确保油处于工作温度。
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| 图 1 | g02422576 |
(1) 位于齿轮泵（制动器、制动器冷却）和机油滤清器（制动系统）之间的测压口 | |
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| 图 2 | g02422577 |
(2) 管组件 (3) 制动器机油冷却器安全阀 | |
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| 图 3 | g00532762 |
制动器油冷却器安全阀 (3) 的剖面图 (3) 制动器机油冷却器安全阀 (4) 垫片 | |
- 将 198-4240 数字压力指示器 连接在测压口 (1) 处。
- 起动发动机。 以低怠速运转发动机。
- 升起卸载车斗。
- 将举倾控制装置操纵杆移到浮动位置。
- 当显示屏显示卸载车斗进入 SNUB 时，查看压力表。 压力表读数应小于 1725 kPa250 (psi)。
注: 在 ET 屏幕、通讯器屏幕或 Advisor 屏幕上可以读取急停位置。
注: 压力读数是安全阀流量在 38 L/min (10 US gpm)的台架测试结果 低怠速下泵的流速为 167 L/min (44 US gpm)。 结果压力可能比提高的值还高。
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| 图 4 | g01566077 |
典型的 | |
- 通过使用"举倾降下调整设置"降低 ET 中的压力。 请参考专门说明书, REHS5093, "772G 非公路用卡车的组装程序", "调整起重机低值"。
注: 专门说明书, REHS5093, "772G 非公路用卡车的组装程序", "调整起重机低值"尚不完整。
- 关闭发动机。
- 拆下测试设备。
台架测试和调整
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| 调节安全阀压力设定值的垫片 | ||
| 零件号 | 厚度 | 压力变化量 |
| 8B-4624 | 0.81 mm (0.032 in) |
30 kPa (4 psi) |
问题：压力低于 586 ± 14 kPa (85 ± 2 psi)。
可能的原因
- 制动器油冷却器安全阀 (3) 卡死到打开位置。
- 制动器油冷却器安全阀 (3) 设定过低。 加装垫片 (4) 。 请参阅表 2。
问题：压力高于 586 ± 14 kPa (85 ± 2 psi)。
可能的原因
- 制动器油冷却器安全阀 (3) 设定过高。 卸下垫片 (4) 。 请参阅表 2。
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