轴承上必须有密封件，防止外部的灰尘和水分进入，也防止轴承内部的润滑油脂外漏。
The bearing must be equipped with seals that are able to keep dust and water out and the grease inside the bearing.
为防止锈蚀，瞄准镜外部未涂漆的金属表面须涂以炮用润滑脂SY4019-85。
Apply lubricating grease SY4019-85 for artillery at the metal surface of exterior of sighting telescope without painting to avoid corrosion.
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