In practice, we should dismantle the original big gear, always ensure the vertical roller mill and the integrity of the upper and lower surfaces, open some gears and release the stress, and then re repair the two sides of the opposite surface, pin hole and screw hole, and grind off the redundant burr and scratch.

In addition, the vertical roller mill of screw hole should be measured separately. The size and number of each hole obtained by measurement shall be equipped with processing bolts respectively. After these processes are finished, installation shall be carried out. During installation, it shall be in accordance with the established number sequence, and it shall not be confused and disordered.

The pinion needs to be coated with red lead oil on at least four gears, then rotate the mill. During the rotation, observe the contact area and bearing size of the two gears in real time. The correct meshing parts of each gear shall be installed on the pitch circle.