The inner lip and the outer lip respectively prevent oil from spilling, and prevent impurities from entering on different positions, and simultaneously play dual protection to the universal joint.
两者在不同 位置分别防油溢出、防杂质进入，同时对万向节起到了双重保护。
Thinly coat sealing lip and outer circumference of sealing ring with vaseline.
将密封圈的外圆和密封唇上涂上一层薄薄的凡士林。
Thinly coat outer circumference and sealing lip of sealing ring with vaseline.
将密封圈的外缘和密封唇上涂上一层薄薄的凡士林。
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