... piston check ring 活塞护环 stern tube check ring 尾轴管止环 ; 尾轴管外端止动环 Axle Check Ring 圆环 ...
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Check and replace the O-ring of the piston head.
检查和更换活塞头的O型圈。
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Check that the piston head is blocked due to the stickiness of the O-ring on it.
检查活塞头o型圈是否有粘性，使得活塞头堵死。
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