Yamaha F150A, Service Manual

Page: 310 / 493

8-3
Lower unit (regular rotation model, L-transom model)
Removing the lower unit
• Make sure to disconnect the battery
cables from the battery, and remove the
clip from the engine shut-off switch.
• When removing the lower unit with the
power unit installed, make sure to sus-
pend the outboard motor. Otherwise, the
outboard motor could fall suddenly and
result in severe injuries.
• When loosening or tightening the pro-
peller nut, do not hold the propeller
using your hands.
1. Drain the gear oil.
2. Remove the cotter pin.
3. Set the gear shift to the N position.
4. Place a block of wood between the anti-
cavitation plate and the propeller to pre-
vent the propeller from turning, and then
remove the propeller nut and propeller.
5. Remove the grommet “1”.
6. Mark the trim tab “2” and lower case with
an identification mark “a”, and then
remove the trim tab “2”.
7. Remove the lower case mounting bolts
“3” and “4”, and then remove the lower
unit “5”.
TIP:
When disassembling the lower unit, measure
the backlash before disassembly. See “Mea-
suring the forward gear backlash and reverse
gear backlash before disassembly” (8-35).
Disassembling the propeller (SDS
propeller)
1. Remove the damper “1”.
Checking the propeller
1. Check the propeller blades and damper
rubber splines. Replace the propeller if
cracked, damaged, or worn.
Checking the lower unit anode
1. Check the trim tab. Clean if there is
grease, oil, or scales.
Driver rod L3 “2”: 90890-06652
Needle bearing attachment “3”:
90890-06653
a
4
3
5
2
1
1
3
2
3