A sagging door is usually caused by loose hinge screws or improper vertical positioning.First, tighten all loose mounting screws on the door hinges.If the door still sags, use a hex wrench or screwdriver to adjust the vertical adjustment screw on the hinge to lift the door and restore it to the correct position.

Locate the vertical, horizontal and depth adjustment screws on the hinge. Use a suitable tool to fine-tune these screws, so as to align the door evenly, ensure smooth closing and stable operation.