Sprocket, Vertical Auger Lower Gear Case Slow Speed (Rice Only)Â Â Â Â Dim A (1): Chain: 60Â Â Â Â Dim B (2): Teeth: 40Â Â Â Â Dim C (3): Bore Dia: 1.502Â Â Â Â Dim D (4): Overall Length: 2.677 John Deere Combine 9510 (Slow Speed, 40 tooth) 9510SH (Slow Speed, 40 tooth) 9550 (Slow Speed, 40 tooth) 9550SH (Slow Speed, 40 tooth) 9560 (Slow Speed, 40 tooth)