Pressure Reducing Valve Pressure for Dead Engine Pilot Supply (Engine OFF) - Test and Adjust
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机器的突然移动或意外起动会对机器上或附近的人员造成人身伤亡。 为了防止人身伤亡,进行以下操作: 将机器放在光滑、水平的表面上。 将作业机具降至地面,并接合停车制动器。 停止发动机,拔下钥匙。 锁止车轮并安装转向机架锁。 |
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所需工具     | ||
零件号     | 说明     | 数量     |
8T-0850     | 压力表     | 1     |
1U-5482     | 压力适配器总成     | 1     |
熄火发动机的先导油由提升液压回路中的油供应。 当发动机停机时,先导油用于将机具降至地面。 减压阀将提升油缸中的高压油降至减压后的先导油压力。 减压后的先导油压力必须低于先导泵油压力。
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图 1 | g01469865 |
机具压力诊断板 (1) 先导油测压口(熄火发动机)。 |
- 连接转向机架锁连杆。
- 将 8T-0850 压力表 (4000 kPa (580 psi))连接至歧管上的测压口 (1) 。
- 接合停车制动器。
- 将变速箱挂入空档。
- 起动发动机。 将液压油加热到大约为 49 至 65°C (120 至 150°F) 的正常工作温度。
- 将动臂抬离地面。
- 关闭发动机。 记录压力表读数。
- 接通钥匙起动开关,然后将机具降至地面。
- 熄火发动机的先导油压力应为 1580 ± 150 kPa (230 ± 22 psi)。
- 如果熄火发动机的先导油压力不正确,必须调整压力控制阀。
- 松开锁紧螺母 (3) 。
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图 2 | g01469875 |
左侧机具主控制阀 (2) 减压阀 (3) 锁紧螺母 (4) 压力调整螺钉 |
- 顺时针转动调整螺钉 (4) ,升高熄火发动机的先导油压力。
- 拧紧锁定螺母。
再次执行测试和调整, "熄火发动机先导供油的减压阀压力(发动机停机)- 测试/调整",以便确认新的设定。
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