Yamaha F150B - Assembling the Gear Pump Assembly

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
ff
f
g
g
g
hh
k
k
k
j
j
j
j
i
i
i
i
k
j
i