Yamaha 55DEHD, Service Manual

Page: 220 / 269

BRKT
7-57
6885J11
Bracket unit
12. Hold the PTT body
e
in a vice using alu-
minum plates
a
on both sides.
13. Loosen the trim cylinder end screws
r
,
and then remove them.
14. Remove the trim ram assemblies.
15. Drain the PTT fluid.
16. Remove the O-ring
y
and backup ring
u
.
Checking the tilt cylinder and trim
cylinder
1. Check the PTT body and tilt cylinder.
Replace the PTT body and tilt cylinder if
cracked or if corroded.
2. Check the inner walls of the PTT body
and tilt cylinder. Replace PTT body and
tilt cylinder if scratched.
r
r
e
t
a
a
68871080
Trim and tilt wrench
t
:
90890-06587
u
y
68871090
3. Check the tilt piston
1
and free piston
2
.
Replace the tilt piston and free piston if
worn or deteriorated.
4. Check the trim ram assemblies
3
.
Replace the trim ram assembles if
scratched.
5. Check the tilt ram
4
and trim rams
5
.
Polish with 400–600 grit sandpaper if
there is light rust or replace if bent or if
there is excessive corrosion.
6. Check the pipes. Replace the pipes if
cracked or if there is corrosion.
Checking the valve
1. Blow the tilt piston absorber valves
1
with compressed air to remove any dust
or residue. Check the tilt piston absorber
valves. Replace the tilt piston absorber
valves if worn or deteriorated.
1
2
3
4
5
68871100
1
1
1
68871110
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