Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 308Get this manual
LOWR DRIVE SHAFT, FORWARD GEAR, SHIFT ROD AND OIL SEAL HOUSING (F15AF9.9C) E
SERVICE POINTS
Pinion and forward gear removal 1RemovePinion gear nut Drive shaft holder 1: YB-0622890890-06515 Pinion nut holder 2: YB-06078N.A2RemovePinion gear Forward gear (along with the tapered roller bearing)