2001 Edition Yamaha F225A and LF225A Outboards Service Manual, Page 253Get this manual
Power trim and tilt unit Checking the reservoir
1Check the reservoir for cracks or corrosionReplace if necessary
Checking the tilt cylinder and trim cylinder
1Check the power trim and tilt unit for cracks or corrosionReplace if necessary2Check the inner walls of the cylinder block and tilt cylinder for scratchesReplace if necessary
4Check the trim and tilt rams for bends or excessive corrosionPolish with #400 600 grit sandpaper if there is light rust or replace if necessary