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The editor of Liuhe heavy-duty machine tool tells you the steps to replace the sealing ring in the single-column hydraulic press: 1. First, disassemble the upper mold and the hydraulic cylinder rod in the single-column hydraulic press, so that the upper mold and the hydraulic cylinder rod are separated. Special attention should be paid to the upper mold of the hydraulic press must be well cushioned. 2. Do not change the seal of the hydraulic cylinder of the single-column hydraulic press online.