Relief Valve (Implement) - Test and Adjust
注: 执行调整之前,参考测试和调整, "机器故障诊断和排除的准备"。
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所需工具     | |||
工具     | 零件号     | 描述     | 数量     |
A     | 4C-4441     | 安全阀测试工具总成     | 1     |
B     | 1U-9358     | 测试歧管组     | 1     |
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图 1 | g01379932 |
组合阀 (1) 机具安全阀 |
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图 2 | g01379933 |
机具安全阀 (2) 座圈组件 (3) 螺母 |
使用工具 (B) 以便在工具 (A) 上测试机具安全阀 (1) 。 安全阀的设定为 27600 ± 400 kPa (3900 ± 60 psi)。
- 把机具安全阀 (1) 从组合阀卸下,再在工具 (A) 上 安装机具安全阀 (1) 。
注: 为了解拆卸安全阀的正确程序,参考拆解和装配, "组合阀 – 拆解"。
- 消除系统内的气体。 油温必须是 49° ± 3°C (120° ± 5°F)。
- 用流量为 38 ± 4 L/min (10 ± 1 US gpm) 的油通到阀里,并记录打开安全阀的压力。
- 把座圈组件 (2) 顺时针转动以提高压力,再把座圈组件 (2) 逆时针转动以降低压力。 座圈组件每转一圈,设定值的变化约为 6300 kPa (915 psi)。
- 重复步骤2 再重复步骤4 直至取得的设定值为 27600 ± 400 kPa (3900 ± 60 psi)。
- 把座圈设到正确的压力设定之后,拧紧螺母 (3) 至扭矩为 50 ± 7 N·m (37 ± 5 lb ft)。 拧紧螺母 (3) 时,把紧座圈组件 (2) 。
- 把测试压力设定为 5600 ± 70 kPa (812 ± 10 psi)。 使油温保持在 26 °C 至 28 °C (79 °F 至 82 °F)。
- 测量漏油量。 如果漏油量大于 0.004 L/min (0.0011 US gpm),就要更换安全阀。
- 在组合阀上安装安全阀。 欲知安装安全阀的正确程序,参考拆解和装配, "组合阀 - 装配"。
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