1. Removing old packing and inspecting the packing box is a key aspect of early installation preparation.

2. Before filling, remove all the old filling materials with special tools and wipe the filling box clean.

3. Observe whether there are defects such as damage, eccentricity, etc. in various parts of the packing box. Damaged valve stems, shaft sleeves, and packing boxes can all affect the performance of the packing.

4. Check if other components are still applicable. Replace all damaged parts.

5. Adjust whether the bearings are concentric. If they are not concentric, they need to be adjusted or replaced.

6. Check if the water pump or mixing kettle is vibrating and adjust it to a stable operating state.