Yamaha F50 Service Manual

							62Y3A117-62
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No. Part name Q’ty RemarksTightening torques
Stage N·mkgf·mft·lb
1Bolt 2 M5 ×
 20 mm 5 0.5 3.6
2 Washer 2
3 Gear pump bracket 1
4 O-ring 2
Not reusable
5 Spacer 2
6Spring 2
7 Valve pin 2
8Ball 2
9 Manual release spring 1
10 Ball 2
11 Gear pump cover 1
12 Spring 2
13 Shuttle piston 1
14 O-ring 1
Not reusable
15 Valve seal 2
16 Circlip 2
17 Pin 2
18 Drive gear 1
19 Shaft 1
20 Driven gear 1
21 Ball 2
22 Shuttle piston 1
23 Valve plate 1
24 Plate 1
25 Gear pump housing 1
Gear pump 
						

							BRKTBracket unit
7-6362Y3A11
Disassembling the tilt cylinder
1. Hold the power trim and tilt 1
 in a vise
using aluminum plates a
 on both sides.
2. Loosen the tilt cylinder end screw 2
, and
then remove it.
 WARNING
Make sure that the ram is fully extended
before removing the end screw.
3. Drain the fluid.
Disassembling the trim cylinder
1. Hold the trim cylinder 1
 in a vise using
aluminum plates a
 on both sides.
NOTE:
Place the trim cylinder in the vise horizon-
tally.
2. Loosen the trim cylinder end screw 2
,
and then remove it.
CAUTION:
Do not damage the check valve b
 when
loosening the end screw.
Trim and tilt cylinder wrench: YB-06175-2B
Cylinder-end screw wrench: 90890-06544
Trim and tilt cylinder wrench: YB-06175-2B
Cylinder-end screw wrench: 90890-06544 
						

							62Y3A117-64
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Disassembling the gear pump
1. Remove the manual release plug 1
 and
gear pump 2
.
2. Remove the relief valve bracket 3
, then
the down-relief valve 4
 and up-relief
valve 5
.
3. Remove the gear pump bracket 6
, then
the down-shuttle piston 7
 and up-shuttle
piston 8
.4. Remove the gear pump cover 9
, then
the down-main valve 0
 and up-main
valve A
. 
5. Remove the drive gear B
 and driven
gear C
.
Checking the tilt cylinder and trim 
cylinder
1. Check the power trim and tilt/hydro tilt for
cracks or corrosion. Replace if neces-
sary.
2. Check the inner walls of the trim cylinder
and tilt cylinder for scratches. Replace if
necessary.
Gear pump 
						

							BRKTBracket unit
7-6562Y3A11
3. Check the outer surface of the tilt piston
and free piston for scratches. Replace if
necessary.
4. Check the tilt ram for bends or excessive
corrosion. Polish with #400–600 grit
sandpaper if there is light rust or replace
if necessary.
Check the valves
1. Check the operation of the check valve
a
 of the trim cylinder end screw and
check the valve for dirt or residue. Clean
if necessary.
2. Check the operation of the tilt piston
absorber valve and check for dirt or resi-
due. Clean if necessary.3. Check the down-main valve 1
 and the
up-main valve 2
 for dirt or residue.
Clean if necessary.
4. Check the down-relief valve 3
, up-relief
valve 4
, and shuttle pistons 5
 for dirt or
residue. Clean if necessary.
Checking the filters
1. Check the gear pump filter 1
 and shuttle
piston filters 2
 for dirt or residue. Clean if
necessary. 
						

							62Y3A117-66
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Checking the gear pump
1. Check the drive gear 1
, driven gear 2
,
and shaft 3
 for damage or excessive
wear. Replace if necessary.
Assembling the gear pump
1. Install the drive gear 1
, driven gear 2
,
shaft 3
, and pins 4
 into the gear pump
housing 5
.
2. Install the balls 6
 into the gear pump
housing 5
.
3. Install the down-main valve 7
 and up-
main valve 8
.
4. Install the gear pump cover 9
.
5. Install the shuttle pistons 0
 into the gear
pump cover 9
.
6. Install the balls A
 into the gear pump
cover 9
 with the manual release spring
B
.7. Install the gear pump bracket C
 by
installing the bolts D
, then tightening
them to the specified torque.
8. Install the down-relief valve E
, up-relief
valve F
, and filter G
.
9. Install the relief valve bracket H
 by
installing the bolts I
, then tightening
them to the specified torque.
Gear pump bracket bolt D
:
5.3 N·m (0.53 kgf·m, 3.8 ft·lb)
Relief valve bracket bolt I
:
5.3 N·m (0.53 kgf·m, 3.8 ft·lb)
Gear pump 
						

							BRKTBracket unit
7-6762Y3A11
10. Install the filters J
 and gear pump K
 by
installing the bolts L
, then tightening
them to the specified torque. 
11. Install the manual release plug M
 and
reservoir cap N
.
12. Fill the reservoir with the recommended
fluid to the correct level as shown.
13. Install the joint O
 and power trim and tilt
motor P
 by installing the bolts Q
, then
tightening them to the specified torque.
Assembling the trim cylinder
1. Install the dust seal 1
 into the tilt cylinder
end screw 2
.
2. Install the O-ring 3
 to the end screw.
3. Install the tilt ram 4
 into the end screw. Gear pump bolt L
:
6.5 N·m (0.65 kgf·m, 4.7 ft·lb)
Recommended power trim and tilt fluid:
ATF Dexron II
 
PTT motor bolt Q
:
4 N·m (0.4 kgf·m, 2.9 ft·lb) 
						

							62Y3A117-68
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4. Install the backup ring 5
 and O-rings 6
and 7
 into the trim cylinder end screw
8
.
5. Install the trim cylinder end screw onto
the tilt ram.
6. Install O-rings 9
 and 0
 onto the trim pis-
ton A
, and then install the trim piston to
the trim cylinder B
.
7. Install the backup ring C
 and O-ring D
into the tilt piston E
.
8. Install balls F
 and G
, absorber valve pin
H
, spring I
, pins J
 and K
, and washer
L
 into the tilt piston.9. Hold the tilt ram end in a vise using alu-
minum plates on both sides.
10. Install the tilt piston to the tilt ram by
installing the bolt, then tightening it to the
specified torque.
11. Install the trim cylinder onto the tilt ram.
12. Hold the trim cylinder M
 in a vise using
aluminum plates a
 on both sides.
NOTE:
Place the trim cylinder in the vise horizon-
tally.
S62Y7740
Tilt piston: 61 N·m (6.1 kgf·m, 44 ft·lb)
Gear pump 
						

							BRKTBracket unit
7-6962Y3A11
13. Install the trim cylinder end screw N
, and
then tighten it to the specified torque.
CAUTION:
Do not damage the check valve b
 when
tightening the end screw.
Assembling the tilt cylinder
1. Install the valve seal 1
 and the circlip 2
into the free piston 3
 as shown.
2. Install the free piston into the trim cylin-
der 4
 by installing the circlip 5
.
3. Install the trim cylinder base 6
, springs
7
, and plate 8
 into the trim cylinder with
the circlip 9
.4. Hold the power trim 0
 and in a vise
using aluminum plates a
 on both sides.
5. Add fluid of the recommended type to the
first level at the bottom of tilt cylinder.
6. Install the balls A
 into the trim cylinder,
and then insert the trim cylinder into the
tilt cylinder B
.
NOTE:
Apply grease to the balls to prevent them
from falling out of the cylinder. Trim and tilt cylinder wrench: YB-06175-2B
Cylinder-end screw wrench: 90890-06544
Trim cylinder end screw N
:
80 N·m (8.0 kgf·m, 58 ft·lb)
Recommended power trim and tilt fluid:
ATF Dexron II
  
						

							62Y3A117-70
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7. Install the tilt cylinder end screw C
, and
then tighten it to the specified torque.
8. Fully extend the tilt rod, and then add suf-
ficient fluid of the recommended type to
the correct level.
9. Install the reservoir cap D
.
Bleeding the power trim and tilt 
(not installed)
1. Close the manual release plug 1
 by
turning it clockwise.2. Place the power trim and tilt in an upright
position.
3. Check the fluid level in the reservoir.
NOTE:
The fluid level should be at the brim of the
filler hole.
4. If necessary, add sufficient fluid of the
recommended type to the correct level.
5. Install the reservoir cap. Trim and tilt cylinder wrench: YB-06175-2B
Cylinder-end screw wrench: 90890-06544
Tilt cylinder end screw C
:
90 N·m (9.0 kgf·m, 65 ft·lb)
Recommended power trim and tilt fluid:
ATF Dexron II
 
Recommended power trim and tilt fluid:
ATF Dexron II
 
Gear pump 
						

							BRKTBracket unit
7-7162Y3A11
6. Connect the PTT motor leads 2
 to the
battery terminals.
7. Reverse the PTT motor leads between
the battery terminals when the tilt ram is
fully extended, and then reverse them
again when it is fully compressed.
NOTE:
Repeat this procedure so that the tilt ram
goes up and down four to five times.
The sound of the power trim and tilt motor
will change when the tilt ram is fully
extended.
8. Check the fluid level again when the tilt
ram is fully extended. Add sufficient fluid,
if necessary, and then repeat step 7.
NOTE:
Repeat this procedure until the fluid remains
at the correct level.
Bleeding the power trim and tilt 
(built-in)
1. Loosen the manual release plug by turn-
ing it counterclockwise until it cannot be
turned further.
2. Fully tilt the outboard up, and then
release it and let it lower by its own
weight four to five times.
3. Tighten the manual release plug by turn-
ing it clockwise.
4. Let the fluid settle for 5 minutes.
5. Push and hold the power trim and tilt
switch in the up position until the out-
board is fully tilted up.
6. Support the outboard with the tilt stop
lever, and then let the fluid settle for 5
minutes.
 WARNING
After tilting up the outboard, be sure to
support it with the tilt stop lever.
Otherwise, the outboard could suddenly
lower if the power trim and tilt unit should
lose fluid pressure. Tilt rod PTT motor leadBattery 
terminal
UpBlue (L)+
 
Green (G)-
 
DownGreen (G)+
 
Blue (L)-