Yamaha F150B, Service Manual

Page: 412 / 458

9-47
BRKT
Bracket unit
Disassembling the gear pump
assembly
1. Remove the PTT motor assembly. See
“Removing the PTT motor” (9-41).
2. Remove the bolts
a
and
b
, and then
remove the gear pump assembly
c
.
3. Remove the O-rings
d
,
e
, valve pin
f
,
and valve seat assembly
g
.
4. Remove the filters
h
, down-relief valve
i
, and O-ring
j
.
5. Remove the gear pump cover
k
, and
then remove the gears
l
, shuttle pistons
m
, and balls
n
,
o
.
6. Remove the spring
p
, absorber valve pin
q
, ball
r
, and up-relief valve seat
s
and
O-ring
t
.
7. Blow compressed air through the holes
a
and
b
to remove the main valves
u
.
WARNING! Never look into the gear
pump housing opening while removing
the main valves because the main
valves and PTT fluid could be forcefully
expelled out.
8. Remove the manual valve
v
.
Checking the gear pump
1. Check the gears
a
. Replace the gear
pump assembly if damaged or exces-
sively worn.
a
b
c
e
d
g
f
h
h i
j
k
l
l
m
n
o
m
p
q
r
s
t
a
b
a
u
b
u
a
b
v