417-1921: Sun Gear

Description: Sun gears, like part 417-1921, are commonly used in planetary gear sets of final drive systems. All Cat gears have unique metallurgy compositions tailored to specific applications, with special steel formulas that improve impact resistance and ensure uniformity and proper load transfer. Some Cat gears also undergo proprietary heat treat processes to improve surface, bore, and core hardness. The result is greater durability, which means longer life and better performance. Attributes: • Hardened steel sun gear • Spur Gear Number of Teeth: 18 • Internal Spline Number of Teeth: 57 • Pitch Diameter: 217.8 mm (8.57 in) • Inside Diameter: 89.36 mm (3.52 in) • Outside Diameter: 260.44 mm (10.25 in) • Width: 99.5 mm (3.92 in) Application: Consult your owner's manual or contact your local Cat Dealer for more information.