ロックウェル硬度計オイルタンクの給油方法: 同時にアンロードハンドルを複数回押し引きしてピストンを複数回上下させ、ピストンが最下点に到達してオイルが溢れるまでバッファ内のエアを全て抜きます。 At the same time, push and pull the unloading handle multiple times to make the piston move up and down multiple times to remove all the air in the buffer until oil overflows when the piston reaches the bottom.
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