The drawing cylinder of C7620 is very difficult to assemble and disassemble ; the oil seal of the drawing cylinder is easy to wear down faster and causes leakage.

• C7620车床的拉紧油缸在装配和拆卸时较为困难；密封圈磨损较快；且漏油现象严重.；针对这些问题；对油缸进行了改进