首先在操作液压扳手之前一定要检查这些事项，然后才能操作液压扳手。

First of all, be sure to check these items before operating the hydraulic wrench, and then operate the hydraulic wrench.

1、检查电动泵的作业电压是否满足220V；电线是否满足4个方。

1. Check whether the operating voltage of the electric pump meets the requirements of 220 V; whether the electric wire meets the requirements of 4 squares.

2、检查高压软管有没有出现折弯的现象，插头插座上是否保持清洁；

2. Check whether the high-pressure hose is bent and whether the plug and socket are kept clean;

3、检查液压油泵的油标位是否在0线以上，液压油是否清澈透明；

3. Check whether the oil mark of hydraulic oil pump is above 0 line and whether the hydraulic oil is clear and transparent;

4、一定要是专用液压油，千万不能混杂其他油。

4. Must be special hydraulic oil, must not mix with other oil.