Yamaha F150B - Disassembling the Gear Pump Assembly; Checking the Gear Pump

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