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Catalog 111 • Page
103
Double Head
johnson
F8B / F9B
johnson
F5B / F7B
johnson
F35B / F4B
JOHNSON
GENERAL PURPOSE ENGINE COOLING
3
/
4
" - 1" PORTS, UP TO 28 GPM, DOUBLE BEARING DESIGN
These medium flow bronze pumps manufactured by Johnson come with a mechanical seal,
double ball bearings and stainless steel shaft. The F5B (JS 10-24571 series) comes with
3
/
4
"
fpt ports,
5
/
8
" shaft diameter and requires an envelope of 3
1
/
2
" high x 4
3
/
16
" wide x 6" long.
The F7B (JS 10-24572 series) comes with 1" fpt ports,
5
/
8
" shaft diameter and requires an
envelope of 3
11
/
16
" high x 4
3
/
4
" wide x 6
3
/
4
" long. Both series have optional cam thicknesses
that produce varying flows. See
for service parts.
3
/
8
" PORTS, UP TO 9 GPM PER HEAD, pedestal or flange
Johnson produces these unique double head pumps in pedestal and flange mounting. The
F35B (JS 10-24143 series) driven pump will mount on the 4-screw cover of any currently
manufactured F35B series pedestal or flangemountmodel. The F4B (JS 10-24144 series) driven
pump will mount on the 6-screw cover of any currently manufactured F4B series pedestal
or flange mount model. The flow chart below reflects the performance of each individual
pump head with full or half cam. See
for service parts.
1
1
/
4
" - 2" PORTS, UP TO 99 GPM, DOUBLE BEARING DESIGN
These high flow bronze pumps manufactured by Johnson come with a mechanical seal, double
ball bearings and stainless steel shaft. The F8B (JS 10-13021 series) comes with 1
1
/
4
" or 1
1
/
2
"
fpt ports,
7
/
8
" or 24mm diameter shaft and requires an envelope of 5
5
/
16
" high x 6
3
/
16
" wide
x 8
1
/
2
" long. The F9B (JS 10-13026 series) comes with 2" fpt ports, 24mm diameter shaft and
requires an envelope of 6
1
/
2
" high x 7
9
/
16
" wide x 11
1
/
8
" long. Both series have optional cam
thicknesses that produce varying flows. See
for service parts.
3
/
8
" pORTS, UP TO 9 GPM, DOUBLE BEARING DESIGN
These low flow bronze pumps by Johnson come with a mechanical seal, double ball bearings
and stainless steel shaft. The F35B (JS 10-24569 series) comes with
3
/
8
" fpt ports, the choice
of 12mm or
3
/
8
" shaft diameter and requires an envelope of 2
5
/
16
" high x 3
3
/
16
" wide x 4
3
/
8
"
long. The F4B (JS 10-24570 series) comes with
3
/
8
" fpt ports, the choice of 12mm or
3
/
8
" shaft
diameter and requires an envelope of 3
1
/
2
" high x 3" wide x 4
3
/
8
" long. Both series have optional
cam thicknesses that produce varying flows. See
and
for service parts.
Discharge
Gallons Per Minute at RPM for F35B – Full Cam
Gallons Per Minute at RPM for F4B – Full Cam
Head in Feet
500
900
1400
2000
2500
500
900
1400
2000
2500
10
.95
1.8
3.0
4.2
5.4
1.8
4.0
6.0
8.0
9.1
20
.90
1.6
2.8
4.1
5.2
1.4
3.7
5.5
7.4
8.7
Discharge
Gallons Per Minute at RPM for F35B – Half Cam
Gallons Per Minute at RPM for F4B – Half Cam
Head in Feet
500
900
1400
2000
2500
500
900
1400
2000
2500
10
.50
1.1
1.7
2.5
3.3
1.0
2.0
3.0
4.1
4.7
20
–
.90
1.6
2.2
3.0
.79
1.7
2.5
3.6
4.1
Discharge
Gallons Per Minute at RPM for F5B – Full Cam
Gallons Per Minute at RPM for F7B – Full Cam
Head in Feet
500
900
1400
2000
500
900
1400
2000
10
3.1
5.5
8.7
12.2
6.6
12.1
19.6
28.3
20
3.0
5.3
8.5
11.9
6.0
11.6
19.0
27.5
Discharge
Gallons Per Minute at RPM for F5B – Half Cam
Gallons Per Minute at RPM for F7B – Half Cam
Head in Feet
500
900
1400
2000
500
900
1400
2000
10
1.8
3.3
5.3
7.4
5.0
9.0
14.5
22.5
20
1.7
3.0
5.0
6.9
4.7
8.2
13.8
21.2
Discharge
Gallons Per Minute at RPM for F8B – Full Cam
Gallons Per Minute at RPM for F9B – Full Cam
Head in Feet
700
1400
1750
2000
700
1400
1750
2000
10
23.1
50.0
63.7
73.7
34.1
70.8
87.5
99.3
20
21.1
47.6
61.6
71.3
32.8
68.9
85.3
97.2
Discharge
Gallons Per Minute at RPM for F8B – Half Cam
Gallons Per Minute at RPM for F9B – Half Cam
Head in Feet
700
1400
1750
2000
700
1400
1750
2000
10
15.9
32.8
41.2
49.1
17.0
35.4
43.7
49.6
20
14.3
30.1
39.1
47.0
16.4
34.4
42.6
48.6
Discharge
Gallons Per Minute at RPM for F35B – Full Cam
Gallons Per Minute at RPM for F4B – Full Cam
Head in Feet
500
900
1400
2000
2500
500
900
1400
2000
2500
10
.95
1.8
3.0
4.2
5.4
1.8
4.0
6.0
8.0
9.1
20
.90
1.6
2.8
4.1
5.2
1.4
3.7
5.5
7.4
8.7
Discharge
Gallons Per Minute at RPM for F35B – Half Cam
Gallons Per Minute at RPM for F4B – Half Cam
Head in Feet
500
900
1400
2000
2500
500
900
1400
2000
2500
10
.50
1.1
1.7
2.5
3.3
1.0
2.0
3.0
4.1
4.7
20
–
.90
1.6
2.2
3.0
.79
1.7
2.5
3.6
4.1