Yamaha F150A, Service Manual

Page: 444 / 493

9-57
PTT gear pump
Removing the gear pump assembly
1. Remove the plate “1”, filter “2”, backup
ring “3”, wave washer “4”, protection
valves “5” and “6”, and gear pump
assembly “7”.
Disassembling the gear pump
housing
1. Remove the O-rings “1” and “2”, spacers
“3” and “4”, and port plugs “5”.
2. Remove the plug “1” and ball “2”.
3. Remove the circlip “1”, manual valve “2”,
O-rings “3” and “4”, manual valve seat
“5”, spring “6”, adapter “7”, spring “8”,
and manual valve seat “9”.
4. Remove the main valves “1” and shuttle
piston “2”, and then remove the O-rings
“3”, “4”, “5”, and “6”.
Disassembling the gear pump
1. Remove the valve lock screws “1” and
“2”, and then remove the spring “3”, valve
support pin “4”, ball “5”, spring “6”, valve
pin “7”, and valve seal “8”.
TIP:
Before removing the valve lock screws “1”
and “2”, measure and write down the screw
height “a” and screw depth “b”.
1
2
3
4
5
6
7
1
1
2
3
4
5
1
2
1
2
3
4
5
6
7
8
9
1
1
2
3
3
4
4
6
5
5