What are the steps for internal inspection of reducers?

Generally speaking, the transmission device of the reducer adopts two sets of two-stage helical gears for transmission. The gears of the equipment have medium hard tooth surfaces. Generally, when the involute helical tooth structure A stops due to vibration, it will be inspected by opening the cover. So what are the steps for internal inspection of the gearbox? Next, I will introduce them in detail:
(1) The clearances of the south and north bearings of the reducer shaft are 0.15mm and 0.10mm, respectively.
The clearances of the south and north bearings on axis II are 0.22mm and 0.20mm, respectively, while the clearances of the south and north bearings on axis III are 0.15mm and 0.20mm, respectively.
(2) The gaps between the two fixed distance rings on the east and west sides are 0.64mm and 0.40mm, respectively. The distance between the joint surface of the upper and lower casings and the low point of the output shaft at the outlet elevation of the reducer is 224.98mm.

(3) Pay attention to the slight pitting corrosion on the working tooth surface of the high-speed shaft small gear and the large gear that meshes with it.
The above are all the specific steps for the internal inspection of the reducer. Generally speaking, during the internal inspection of the equipment, a pair of gear teeth with secondary meshing will have severe pitting corrosion, and the teeth of large and small gears will also have pitting and peeling phenomena in the working direction. This often forms a small groove near the indexing circle due to pitting and peeling, with a depth of about 1-1.5rnm and a tooth length of about 80A. Moreover, the involute profile shape of the gear teeth section of the reducer has changed.