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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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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