Yamaha F150B, Service Manual

Page: 413 / 458

9-48
PTT gear pump
0
1
2
3
4
5
6
7
8
9
10
A
2. Check the down-relief valve
b
. Clean if
there is dirt or residue.
3. Check the main valves
c
and shuttle
pistons
d
. Clean if there is dirt or
residue.
4. Check the absorber valve pin
e
and up-
relief valve seat
f
. Clean if there is dirt
or residue.
5. Check the valve pin
g
and valve seat
h
.
Clean if there is dirt or residue.
Assembling the gear pump assembly
• Do not use a rag when assembling the
PTT unit because dust and particles on
the PTT unit components can lead to
poor performance.
• Do not reuse the O-rings, always replace
them with new ones.
1. Install a new O-ring
a
, the up-relief valve
seat
b
, ball
c
, absorber valve pin
d
,
and spring
e
.
2. Install new O-rings
f
onto the main
valves
g
, and then install the main
valves.
3. Install the gears
h
.
4. Install the balls
i
, shuttle pistons
j
, and
balls
k
.
TIP:
Apply grease to the balls and shuttle pistons
to prevent them from falling out of the gear
pump cover.
a
d
c
d
e
f
b
g
h
c
a
a
b
b
c
c
d
d
e
e
f f
f
g
g
g
h h
k
k k
j
j
j
j
i
i
i
i
k
j
i