Control Valve (Boom Lowering) - Manual
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| 图 1 | g02203593 |
动臂底部 (1) 手动下降阀 | |
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| 图 2 | g01046919 |
动臂下降控制阀 | |
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| 图 3 | g01046870 |
(1) 手动下降阀 (2) 滑阀 (3) 动臂下降控制阀 (4) 回转马达顶部上的回油歧管 (5) 低速回油单向阀 | |
必须向内转动图 2 中动臂下降控制阀上的螺钉，以便手动降下动臂。 转动这些螺钉后，必须转动图 1 中该阀上的螺钉以降下动臂。
当手动下降阀 (1) 打开时，允许液压油从两个动臂油缸的缸盖端经过阀 (1) 、回油歧管 (4) 、低速回油单向阀 (5) 流回液压油箱。
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