Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 358Get this manual
DRIVE SHAFT, FORWARD GEAR, SHIFT ROD AND OIL SEAL HOUSING (FT9.9D) E
SERVICE POINTS
Pinion and forward gear removal 1RemovePinion gear nut Drive shaft holder 1: 90890-06515