Abstract: To enhance production capacity of the manufacturing equipment, proper modification of the gear reducer of the Φ 76 mm pipe mill located at Seamless Steel Tube Plant, Anyang I ＆ S Corporation, Ltd., Henan Province was conducted to increase the mill speed. Based on relevant comparison and analysis, it was chosen to use a lower speed ratio for the reducer so as to increase the mill speed. The solution involved such details like changing tooth number distribution of the reducer’s two-stage drive gears, using certain new gear material, enhancing gear hardness and processing accuracy.odificationofGe