Yamaha Marine Outboards F4A/F4 Factory Service Manual, Page 80Get this manual

INSP ADJ
LOWER UNIT
LOWER UNIT
Gear oil 1Check: 9Gear oil Milky oil Replace the oil sealSlag oil Check the gear, bearing and dog2Check: 9Gear oil level level is low Add oil to the proper level3Replace: 9Gear oil

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives