Yamaha FT50C Service Manual page 254

TRBL
SHTG
Symptom: Power trim and tilt unit does not hold the outboard motor up.
Check that the manual valve is
closed.
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 it.
9-11
Troubleshooting
No
Close the valve.
No
Add fluid to the correct level.
62Y5A11