Gear after heat treatment with high hardness and strength, and shaft installed in the replaceable shaft sleeve.
齿轮经热处理有较高的硬度和强度，与轴一同安装在可更换的轴套内运转。
Shaft sleeve: Sure to change sleeve when its surface is rough and damaged seriously.
轴套：表面粗糙及损伤严重时，更换轴套。
The shaft sleeve and mechanical seal can be replaced without removing the shaft from the pump.
轴套和机封的更换不必将轴从泵上拆下来。
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