2005 Yamaha F90TR 90HP Outboards Factory Service Manual, Page 191Get this manual
Bracket unit
15Install the tilt cylinder end screw 8, and then tighten it to the specified torque
Assembling the power trim and tilt unit
1Hold the trim cylinder in vise using aluminum plates on both sides
CAUTION:
Do not damage the check valve when tightening the end screw
2Install the filters and gear pump assembly by installing the bolts 2, then tightening them to the specified torques3Install the manual valve and reservoir cap 4
Trim cylinder wrench: YB-06175-2B