Yamaha F90D Service Manual page 229

Is it closed?
Yes
Check the power trim and tilt
fluid level.
At specified
level?
Yes
Disassemble the power trim and
tilt unit, and then check the filter
for debris or dirt.
Stuck foreign
substance or
clogs?
No
Check the fluid passages for
clogs or debris.
Clogs or debris?
No
Check the internal parts (valves,
pistons, gears, etc.).
6D81G11
No
Close the valve.
No
Add fluid to the correct level.
Yes
Clean or replace the filters.
Yes
Clean the passages.
Bracket unit
1
2
3
4
5
6
7
8
9
9-14