The overall design for the hydraulic top drive, discussed how to choice the motor, pump, and the design and layout of the gear box, the brake energy recovery and so on.

对液压顶驱进行了总体设计，讨论了马达、泵等的选择，减速箱的设计方案与布局，刹车制动能量回收等。

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The oil pump drive gear oil seal is damaged, the air into the hydraulic system;

油泵主动齿轮油封损坏，空气进入液压系统；

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The oil pump drive gear oil seal is damaged, the air into the hydraulic system;

油泵主动齿轮油封损坏，空气进入液压系统；

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