1.Stop using and disconnect the power supply: At the beginning, stop using the circulating water vacuum pump and disconnect the power supply to ensure safe operation.

2. Cleaning and preparing the surface: Clean the surface at the crack area to remove any attachments and dirt. You can use a mild cleaning agent and soft cloth for cleaning, and then rinse thoroughly with clean water.

3. Adhesive selection: Select an adhesive that is suitable for repairing materials. Select a suitable adhesive based on factors such as the material of the circulating water vacuum pump and the size and location of cracks. Common choices include epoxy resin adhesive, polymer adhesive, silicone, etc.

4. Adhesive application: According to the instructions for using the adhesive, evenly apply it to the crack. Ensure that the adhesive covers the cracks and fills them in.

5. Tightening and curing: Use appropriate tools and methods to tightly fix the two sides of the crack together to ensure tight adhesion of the adhesive. Then, based on the curing time of the adhesive, wait for sufficient time for the adhesive to cure.

6. Surface treatment: If necessary, further treatment can be carried out on the repaired surface, such as grinding, polishing, etc., to ensure a flat and smooth surface.

7. Testing and Inspection: Before reusing the circulating water vacuum pump, conduct testing and inspection to ensure that the repaired part can function properly and check for any air leaks or other issues.

Please note that the above steps are for reference only and should be operated according to specific circumstances. If you are unsure how to repair cracks or require professional repair support, it is recommended to consult the manufacturer or professional repair personnel for advice. Ensure that relevant safety operating procedures are strictly followed during repair operations.