Yamaha F400A 2022 - Page 555

General periodic maintenance
10-18
2. Drain:
•Gear oil
a. Tilt the outboard motor so that the
drain screw is at the lowest point.
b. Place a drain pan “1” under the gear oil
drain hole.
c. Remove the drain screw “2” and O-ring
“3”.
If there is a significant amount of metal par-
ticles on the magnetic drain screw, the low-
er unit may have a problem.
d. Remove the oil level plug “4” and O-
ring “5” and let the oil drain completely.
After the gear oil has been drained, check
the used oil. If the oil is milky, water is get-
ting into the lower case, which can cause
gear damage.
e. After the gear oil has been drained,
check the used oil. Pressure test the
lower case and inspect the oil seal for
damage if the oil is milky. See “Check-
ing the lower unit for leakage” (8-6).
3. Install:
• O-ring “1”
• Drain screw “2”
TIP:
Before installing the magnetic drain screw,
make sure to remove all metal particles.
4. Remove:
• Oil filler plug “3”
•O-ring “4”
5. Fill:
•Gear oil
a. Place the outboard motor in an upright
position.
b. Insert the gear oil pump into the filler
hole, and then fill the lower unit slowly
with gear oil until oil flows out of the
check hole and no air bubbles are visi-
ble.
c. Install a new O-ring “1” and the oil level
plug “2”.
1
2
1
2
4 5
2 3
1
New
T
R
.
.
Drain screw “2”
2.5 N·m (0.25 kgf·m, 1.8 lb·ft)
T
R
.
.
Oil level plug “2”
2.5 N·m (0.25 kgf·m, 1.8 lb·ft)
2
3 4
1
2
1