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The pinion flange (axle input flange) 99014320205 is a heavy-duty transmission component for Sinotruk HOWO trucks. Based on our field experience, this flange is designed to connect the propeller shaft to the differential pinion gear, handling extreme torque loads. The genuine 99014320205 part undergoes induction hardening on the splines and precision grinding on the seal surface to ensure a leak-free operation and maximum durability in demanding haulage conditions. Mechanic's Expert Advice: Oil leaks from the pinion seal or driveline vibrations are often caused by a worn or grooved flange neck. During the replacement of the 99014320205 flange, it is critical to inspect the splines for any signs of play. Installation Tip: Always use a new oil seal and ensure the pinion nut is torqued to the manufacturer’s specifications. Over-tightening can damage the crush sleeve and bearings inside the differential. A properly balanced flange is essential for preventing premature wear on universal joints and the entire drivetrain. We specialize in spare parts for major heavy machinery brands: CHANGLIN, Sinomach, XCMG, Everun, HOWO, SITRAK, FAW, SEM, SDLG, LiuGong, FOTON, LINGONG, SHANTUI, CHENGGONG, XGMA.