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1) Remove the intermediate section of the coupling and secure it in place； 2) Make marks on the base (to facilitate alignment); loosen the gearbox foot bolts. 3) Tie the fan together symmetrically and use a crane to lower it to the ground. 4) Remove the bolts holding the hub cover, and create special tools for removing the hub. 5) When removal is difficult, heat the hub evenly, starting from the outside toward the inside; after removal, have a specialist carry out rust removal and anti-corrosion treatment on the hub, and replace the bolts if they are severely corroded ； 6) Remove the upper oil seal cover and note down the model of the oil seal. 7) Unscrew the bolts holding the large cover of the gearbox, remove the positioning pin, and lift off the large cover. 8) Take out the output shaft and the intermediate shaft, clean them, and then place them in their proper positions. 9) Remove the bearing housing of the input shaft, and take out both the input shaft and the bearing housing. 10) Remove the idler wheel on the input shaft, as well as the lock nut of the input bearing; take out the input shaft and check for wear on the gears and bearings, as well as any signs of aging in the oil seals. 11) Check for wear on the bearings; ensure that there are no grooves or pitting on the balls, and that there are no signs of wear on the raceways. 12) Clean and repair all components; the gearbox can be installed only after it has been thoroughly cleaned. 13) Place the output shaft and the intermediate shaft into the gearbox together. 14) Apply red lead oil to the gears of the intermediate shaft, rotate the shaft, and ensure that the contact area is at least 60% in terms of tooth length and at least 45% in terms of tooth height ； 15) After all the above checks are passed, install the cover, prepare the contact surfaces properly, apply sealant, first insert the positioning pins, and then tighten the bolts ； 16) Install the oil seal cover and the intermediate shaft gland. Be careful to first tighten the bolts on the inner ring of the intermediate shaft in order to lift it, then install the input shaft; after the input shaft is installed, rotate it manually ； 17) The play of the output shaft should be between 0.06–0.08 mm, with a maximum of 0.16 mm; adjustments should be made if this limit is exceeded ； 18) Install the couplings, hub blades, etc.; make sure the bolts securing the hub cover are tightened properly ； 19) After cleaning the base, reinstall the reducer and align it; use two dial indicators for radial alignment, and a feeler gauge or caliper for axial alignment ； 20) Taking any point in the air duct as a reference, check that the height difference between the blades is ≤ 40 mm, and the gap at the tip of the blades is 30 ± 5 mm ； 21) Use an adjustable square to measure the blade angle at 8–15°, with the measurement point located 15 cm inside the tip of the blade ； 22) Add lubricating oil and power on to test the machine.