Catalog 9129 8203-02
May 1998, GB
Hydraulic Pump
Series F2
Fixed Displacement
2
Hydraulic pump Series F2
VOAC Hydraulics Division reserves the right to modify
products without prior notice.
Even though the brochure is revised and updated
continuously, there is always a possibility of errors.
For more detailed information about the products,
please contact VOAC Hydraulics Division.
Content Page
General information 3
Specifications 4
Flow vs. shaft speed 4
Shaft torque vs. pressure 4
Installation dimensions 5
Ordering information 5
Accessories 6
BPV-F2 electrical
bypass valves 6
MB-F2-H1
torque limiting valve 6
Fitting kits 6
Installation and
start-up 7
Conversion factors
1 kg 2.20 lb
1 N 0.225 lbf
1 Nm 0.738 lbf ft
1 l 0.264 US gallon
1 cm
3
0.061 cu in
1 mm 0.039 in
9
/
5
°C1 °F
Hydraulic pump Series F2
3
Series F2 is a further development of the twin-flow version of
series F1, the very first bent-axis truck pump on the market
to feature two entirely independent flows.
With a suitable build-up of the hydraulic system, the main
advantage with a twin-flow pump is that three different flows
can be provided at the same engine speed.
The twin-flow pump makes it possible to further optimize the
hydraulic system and offers:
• Less energy consumption
• Reduced risk of system overheating
• Lower weight
• Easier installation
• Standardized system solutions
The twin-flow pump makes it possible to operate two work
functions that are independent of each other which leads
to higher speed and an increased operating precision.
Another requirement can be a large and a small flow,
or two equal flows. All of these alternatives are possible
with the twin-flow pump.
The pump can be utilized to provide one flow at high
system pressure, and, as soon as the pressure has
decreased sufficiently, add the flow from the other circuit.
This eliminates the risk of exceeding the PTO power rating
and, at the same time, provide an optimal driving function.
Typical twin-flow applications
• Large truck loaders
• Forestry cranes
• Hook loaders/lift dumpers
• Tipper/crane combinations
• Refuse collecting vehicles
The pump shaft end and mounting flange meet the ISO standard
and suits PTO direct mounting.
Suitable PTO:s for most European truck gearboxes are avilable
from our sales offices and distributors.
Twin-flow pump
series F2
4
Hydraulic pump Series F2
Pump frame size F2-53/53 F2-70/35
Displacement [cm
3
/rev]
Port A 54 69
Port B 52 36
Max operating pressure [bar] 350 350
Shaft speed [rpm]
(unloaded pump; low pressure) 2000 2000
Max selfpriming speed [rpm]
(at 1.0 bar abs. inlet pressure) 1650 1650
Input power [kW]
Max intermittent 100 100
Max continuous 75 75
Weight [kg] 19 19
Flow vs. shaft speed (theoretical)
Pump speed [rpm] 900 1000 1100 1200 1300 1400 1500 1600
F2-53/53 flow [l/min]
Port A 49 54 59 65 70 75 81 86
Port B 47 52 57 62 67 73 78 83
Total (ports A + B) 96 106 116 127 137 148 159 169
F2-70/35 flow [l/min]
Port A 62 69 76 83 90 97 104 110
Port B 32 36 40 43 47 51 54 58
Total (ports A + B) 94 105 116 126 137 148 158 168
Shaft torque vs. pressure (theoretical)
Pressure [bar] 150 200 250 300 350
F2-53/53 torque [Nm]
Port A 128 171 214 257 300
Port B 124 165 206 247 289
Total (ports A and B) 252 336 420 504 589
F2-70/35 torque [Nm]
Port A 164 219 274 329 383
Port B 86 114 143 171 200
Total (ports A and B) 250 333 417 500 583
'Left hand' and 'right hand' end caps
Specifications
End cap for right hand rotating pump.
End cap for left hand rotating pump.
Outer pressure
port (A)
Inlet (suction)
port
Inner pressure
port (B)
Outer pressure
port (A)
Inlet (suction)
port
Inner pressure
port (B)
F2 B
A
F2 A
B
Hydraulic pump Series F2
5
80
277
12
27.8
55
1.85
+0.3/-0
37
8.5
127
98
169
213
40°
243
262
15
109
109
74
M12x24
148
φ 33 +0/-0.1
φ 34.9
φ 80 f7
81
51Pressure ports
(BSP
3
/
4
")
Inlet (suction) port
(BSP1
1
/
4
")
81
51
Right hand rotation.
Left hand rotation.
φ 8.1 +0.1/-0
Drain hole
(between
shaft seals)
Inspection port
(plugged)
Spline B8x32x36
(DIN 5462)
B
F2 B
Installation dimensions
Example: F2 - 53/53 - L
Frame size [cm
3
/rev]
53/53
70/35
Direction of rotation
L Left hand
R Right hand
NOTE:
- Before start-up, tighten
the inspection port to
70–100 Nm.
- To change the direction
of rotation, the end cap
must be replaced.
Ordering information
Standard versions
Designation Ordering no.
F2-53/53-R 379 9980
F2-53/53-L 379 9990
F2-70/35-R 379 9960
F2-70/35-L 379 9970
6
Hydraulic pump Series F2
MB-F2-H1 torque limiting valve
The MB-F2-H1 torque limiting valve protects the PTO
output shaft (which drives the pump) from being over-
loaded.
When system pressure increases to the valve setting
pressure, the flow from the pump port that is connected
to the valve is being unloaded to the reservoir.
The valve is designed for operating pressures
to 350 bar.
MB-F2-H1 ordering number: 378 0202.
Additional information is provided in our 'Truck Acces-
sories' bulletin (catalog no. 9129 8242-02; page 11).
Accessories
BPV-F2 electrical bypass valves
The BPV-F2 bypass valve (only suitable for series F2
pumps) facilitates controlling the two pump flows
independently from each other.
The valve can be utilized for left hand and right hand
pumps. It is installed directly on the pump port flange
with two 'banjo' fittings which makes the assembly
very compact requiring a minimum of piping.
The valve is controlled by two solenoids (24 or 12 VDC);
refer to the schematic to the right.
Ordering numbers:
- 379 4699 (24 VDC; standard)
- 379 8533 (12 VDC; optional)
NOTE: - The BPV-F2 valve must be operated in an
open loop system (to secure a small cooling
flow through the pump in the bypass mode).
- The valve functions only when system
pressure is below 20 bar.
Additional information is provided in our 'Truck Acces-
sories' bulletin (catalog no. 9129 8242-02; page 14).
Fitting kits
Fitting kits with 45° och 90° inlet (suction) fitting are
available; refer to the illustration to the right.
The fitting kits contain two pressure fittings, one inlet
fitting and corresponding seal washers.
Additional information is provided in our 'Truck Acces-
sories' bulletin (catalog no. 9129 8242-02; page 3).
Ordering no. Kit C1 C2
379 9914 45° BSP
3
/
4
"2"
379 9561 45° BSP
3
/
4
"2
1
/
2
"
379 9917 90° BSP
3
/
4
"2"
Fitting kit
with 45°
adjustable
inlet fitting
Fitting kit
with 90°
adjustable
inlet fitting
C
2
C
2
C
1
60°
C
1
60°
Directional
control valve
Pilot operated
check valve
BPV-F2
bypass valve
F2 twin-flow
pump
Solenoid valve
(24 or 12 VDC)
70 35
MB-F2-H1
Application example: MB-F2-H1 valve block.
Torque limiting
valve
Unloading valve
(BPV-F2)
F2 twin-flow
pump
Hydraulic pump Series F2
7
End cap
Barrel
housing
Inspection port
(plugged)
Bearing
housing
Direction
of rotation
Right hand rotation. Left hand rotation.
ROTATION
OIL
Before start-up, the housing must
be filled with hydraulic fluid.
NOTE:
- The inlet (suction) port should
always be above the pressure
port when the pump is installed
above the reservoir oil level (fig. 1).
- During operation, the pump
must be filled with oil to at
least 50%.
Filtration
To obtain long F2 life, we recom-
mend a filtration level of:
• 25 µm (absolute) in clean environ-
ment or at low pressures
• 10 µm (absolute) in contaminated
environment or at high pressures
Filtration should meet ISO standard
4406, code 18/13.
Start-up
Make sure the entire hydraulic sys-
tem is clean before filling it with a
recommended fluid.
The pump must also be filled as the
internal leakage does not provide
sufficient lubrication at start-up.
Direction of rotation
The above illustrations show flow
vs. shaft rotation for left hand and
right hand pump versions respec-
tively.
The F2 twin flow pump is designed
for left hand or right hand rotating
PTO's. In order to change the direc-
tion of rotation of the pump, the
pump end cap must be replaced.
Installation
The robust shaft bearings of the
pump allows the F2 to be installed
on a bracket (driven by a belt or
cardan shaft) or directly on the PTO.
Fig. 2 shows three ways of install-
ing a gear on the F2 shaft. On a
non-geared PTO or
a
geared PTO
with support bearings, the pump
shaft is usually installed directly in
the internally splined PTO output
shaft.
Hydraulic fluids
The F2 data shown in the specifica-
tions on page 4 are valid when ope-
rating on a high quality, mineral
based fluid.
Hydraulic fluids type HLP (DIN
51524), ATF (automatic transmis-
sion fluids), and API type CD engine
oils are suitable.
Fluid temperature
Main circuit: Max 75 ˚C.
Viscosity
Recommended viscosity:
20 to 30 mm
2
/s (cSt).
Operating viscosity limits:
10 - 400 mm
2
/s.
At start-up: Max 1000 mm
2
/s.
Drain line
F2 pumps don't need a drain line
as they are internally drained.
IMPORTANT
Force must never be used when
installing a coupling, a sleeve or a
gear on the F2 pump shaft.
The tool shown in fig. 3 facilitates
the installation (our P/N 370 6851).
Installation and start-up
Fig. 1. Fig. 2.
Fig. 3.
VOAC Hydraulics Division
S-461 82 Trollhättan
Sweden
Tel +46 520 986 00
Fax +46 520 371 05
Catalog 9129 8203-02
Ed. 1552-9822 GB
Please contact our sales representative:
