1. It is not allowed to fill any gasket between the split surfaces of the box, but sealant or water glass can be applied to ensure sealing;
2. During assembly, before tightening the box bolts, a 0.05mm feeler gauge should be used to check the tightness between the box cover and the box seat joint surface;
3. The seal of the shaft extension should be coated with grease. All sealing devices should be installed strictly as required.