Inspection of the hulls of the axle boxes. The body of the axle box from the outside is inspected to detect cracks that are not allowed. If it has longitudinal scuffs or risks with a depth of no more than 1 mm on the seating surface, then it can be approved for operation after cleaning the edges with sandpaper No. 180 with oil. In the presence of local workings caused by the rotation of the rings, the axle box body is allowed to operate if the output does not exceed the norms for ovality. Corrosion on the landing surface is cleaned with sandpaper with oil. Burrs and nicks on labyrinth grooves can be cleaned with sandpaper.