Description:Coupling part # 8W-3998 is used to connect the cushion hitch pump to the pump drive shaft.Attributes:• Hardened steel coupling• Coating: Zinc-Iron Phosphate• External Spline Number of Teeth: 37• Internal Spline Number of Teeth: 11• Shaft Diameter: 40 mm (1.575 in)• Length: 110 mm (4.331 in)Application:Consult your owner's manual or contact your local Cat Dealer for more information.