Operating multiple directional value can separately control the fore and aft motion of swing arm oil cylinder, outrigger oil cylinder or hook oil cylinder to finish working of hoisting or unloading.
操作多路换向阀可分别控制摆臂油缸、支腿油缸或锁钩油缸的伸缩运动，完成吊装或卸料工作。
Hydraulic can avoid outrigger hydraulic oil cylinder have a soft leg phenomenon in working and outrigger accident put out in driving.
液压锁可以防止支腿液压油缸在工作中发生软腿现象并防止行驶中支腿意外伸出。
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