Yamaha F200B, Service Manual

Page: 528 / 579

BRKT
Bracket unit
9-53
Disassembling the gear pump
assembly
1. Remove the PTT motor assembly. See
“Removing the PTT motor” (9-45).
2. Remove the manual valve 1 , and then
remove the gear pump assembly 2 .
3. Remove the screws 3 , and then remove
the relief valve seal 4 and ball 5 .
È
Down-relief valve
É
Up-relief valve
TIP:
Before removing the screws
3
, measure and
write down the screw depth
a
and screw
height
b
.
4. Remove the bracket
6
, and then remove
the balls
7
and
8
.
5. Remove the gear housing
9
, and then
remove the down-shuttle piston
0
and
up-shuttle piston
A
.
6. Remove the drive gear
B
, driven gear
C
, balls
D
, and pins
E
.
Checking the gear pump
1. Check the drive gear
1
and driven gear
2
. Replace the gear pump assembly if
damaged or excessive worn.
2. Check the up-relief valve
3
and down-
relief valve
4
. Clean if there is dirt or res-
idue.
3. Check the main valves
5
. Clean if there
is dirt or residue.
4. Check the absorber valves
6
and
7
.
Clean if there is dirt or residue.
1
2
3
4
5
a
b
È É
3 3
6
7
7
8
9
0
A
B
C
D
E