该进气通孔上设有可封住该进气通孔的升降柱；
The air-in via hole is provided with a lifting post which can seal the air-in via hole;
其他可能的原因包括油泵问题，杆和柱轴承之间的空隙，凸轮轴停止工作或者凸轮的方位和升降等。
Other possible reasons include problems with the oil pump, rod and main bearing clearances, camshaft end play, or CAM bearings and lifters.
SS120单柱施工升降机由金属结构、工作机构、电气控制以及安全保护装置等部分组成。
The SS120 column construction lift is composed by metal structure, working mechanism, electrical control and safety protection instrument.
酷似伸缩臂叉装机的四柱升降机附有一个多承重负荷图。
Quad Lifters come with a multi-capacity load chart that looks like a telehandler's.
每起钻20柱，要核对泥浆的升降情况。
Check the fluctuation of mud level whenever 20 strings pulled out.
特点：电动升降，电动复位，双柱间距离可调。
Feature: electronic rise and down, electronic reset, the distance between the posts can be adjustable.
特点：电动升降，电动复位，双柱间距离可调。
Feature: electronic rise and down, electronic reset, the distance between the posts can be adjustable.
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