The upper ring or rings are to prevent compression leakage; the lower ring or rings control the amount of oil being deposited on the cylinder wall.
上部的活塞环用来阻止压缩空气泄露；而下部的活塞环用来控制气缸壁上存留下来的机油数量。
A core regulating pad ring is padded on the lower ring of the thrust bearing, which can make the hook swing in any directions corresponding to the connecting cylinder.
在推力轴承下圈垫上调心垫圈，可使吊钩相对连接筒在任意方向上摆动。
A core regulating pad ring is padded on the lower ring of the thrust bearing, which can make the hook swing in any directions corresponding to the connecting cylinder.
在推力轴承下圈垫上调心垫圈，可使吊钩相对连接筒在任意方向上摆动。
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