RE 92270/06.2018, Bosch Rexroth AG
Features
▶ Variable pump with axial tapered piston rotary group in
bent-axis design with special properties and dimensions
for use in commercial vehicles.
▶ Flow is proportional to the drive speed and displacement.
▶ The flow can be infinitely varied by adjusting the
swivel angle.
▶ Favorable power/weight ratio, small dimensions,
optimum efficiency and economic design
▶ High self-suction capability
▶ Flange and shaft designed for direct mounting on the
power take-off of commercial vehicles
▶ Low noise level
▶ High-pressure pump for use in commercial vehicles
▶ Sizes 55 to 107
▶ Nominal pressure 350 bar
▶ Maximum pressure 400 bar
▶ Open circuit
Axial piston variable pump
A18VO Series 11
RE 92270
Edition: 06.2018
Replaces: 06.2015
Contents
Type code 2
Hydraulic fluid 4
Working pressure range 5
Technical data 6
DRS – Pressure controller with load sensing 8
EP – Proportional control, electric 10
Dimensions, size 55 12
Dimensions, size 80 14
Dimensions, size 107 16
Connector for solenoids 18
Speed sensors DSA and DSM 18
Accessories 19
Installation instructions 21
Other related documents 22
Project planning notes 23
Safety instructions 23
2
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
Type code
Type code
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
A18V O 0 / 11 N W K0 –
Axial piston unit
01 Bent-axis design, variable, nominal pressure 350 bar, maximum pressure 400 bar, for commercial vehicles (trucks)
A18V
Operating mode
02 Pump, open circuit
O
Sizes (NG)
03 Geometric displacement, see table of values on page 6
055 080 107
Control devices 055 080 107
04 Pressure controller with load sensing
● ● ● DRS
Proportional control, electric positive control
U = 12 V
● ● ● EP1
U = 24 V
● ● ● EP2
negative control
U = 12 V
– – ● EP5
U = 24 V
– – ● EP6
Connector for solenoids
05 Without connector (without solenoid, only for hydraulic control)
0
DEUTSCH molded connector, 2-pin – without suppressor diode
P
Auxiliary functions 1
06 Without auxiliary functions
0
Series
07 Series 1, Index 1
11
Design of ports and fastening threads
08 Volumetric ports according to DIN 3852 with profile seal, volumetric fastening thread according to DIN 13
N
Direction of rotation
09 Viewed on drive shaft clockwise
R
counter-clockwise
L
Sealing material
10 FKM (fluoroelastomer) including the 2 shaft seal rings in FKM
W
Mounting flange
11 Special flange ISO 7653-1985 (for trucks)
K0
Drive shaft
12 Splined shaft similar to DIN ISO 14 (for trucks)
E8
Working port
13 Threaded ports A and S at rear
1
Threaded ports A and S at rear, with mounted suction adapter
2
Speed sensor 055 080 107
14 Without speed sensor
● ● ● 0
DSA speed sensor mounted
1)
– ● – V
DSM speed sensor mounted
1)
– ● – M
1) Specify type key of sensor in accordance with data sheet 95133
(DSA) and/or 95132 (DSM) separately and observe the
requirements for the electronics
3
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
Type code
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
A18V O 0 / 11 N W K0 –
Standard / special version
15 Standard version
0
Standard version with installation variants, e.g. thread adapter mounted on the X port
Y
Special version
S
●
= Available – = Not available
Notice
Note the project planning notes on page23.
4
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
Hydraulic fluid
Hydraulic fluid
The A18VO variable pump is designed for operation with
HLP mineral oil according to DIN 51524.
Application instructions and requirements for hydraulic
fluids should be taken from the following data sheets
before the start of project planning:
▶ 90220: Hydraulic fluids based on mineral oils and
related hydrocarbons
▶ 90221: Environmentally acceptable hydraulic fluids
▶ 90222: Fire-resistant, water-free hydraulic fluids
(HFDR/HFDU)
Variable pump A18VO is not suitable for operation with
water-containing HF hydraulic fluids.
Notes on selection of hydraulic fluid
The hydraulic fluid should be selected so that the operating
viscosity in the operating temperature range is within the
optimum range (ν
opt
see selection diagram).
Observe
At no point of the component may the temperature be
higher than 115 °C. The temperature difference specified in
the table is to be taken into account when determining the
viscosity in the bearing.
Please contact us if the above conditions cannot be met
due to extreme operating parameters.
Viscosity and temperature of hydraulic fluids
Viscosity Temperature Comment
Cold start
ν
max
≤1600mm
2
/s θ
St
≥−40°C
1)
t≤3min, without load (p≤50bar), n≤1000rpm
Permissible temperature difference
ΔT≤25K
between axial piston unit and hydraulic fluid in the system
Warm-up phase
ν=1600 to 400 mm
2
/s θ=-40°C to -25°C at p≤0.7•p
nom
, n≤0.5•n
nom
and t≤15min
Continuous operation
ν=400 to 10 mm
2
/s
this corresponds, for VG46 for example, to a temperature range
of +5°C to +85°C (see selection diagram)
θ=-25°C to +103°C
measured at air bleed port R
Note the permissible temperature range of the shaft seal
1)
(ΔT=approx.12K between the bearing/shaft seal and port R)
ν
opt
=36 to 16mm
2
/s
Range of optimum operating viscosity and efficiency
Short-term operation
ν
min
≥7mm
2
/s t<3min, p<0.3×p
nom
▼ Selection diagram
−40 −25 −10 10 30 50 90 11570
0
7
10
40
60
20
100
200
400
600
1000
1600
VG 22
VG 32
VG 46
VG 68
VG 100
16
36
Optimum operating viscosity range v
opt
Optimum efficiency
Maximum permissible viscosity for cold start
Minimum permissible viscosity for short-term operation
Temperature θ [°C]
Viscosity ν [mm
2
/s]
Continuous operation
Warm-up phase
Minimum permissible temperature for cold start
1) The FKM shaft seal is permissible for temperatures of -25°C to
+115°C, please contact us for temperatures below –25°C.
5
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
Hydraulic fluid
Working pressure range
Pressure at working port A (high-pressure side) Definition
Nominal pressure p
nom
350 bar absolute The nominal pressure corresponds to the maximum design pressure.
Maximum pressure p
max
400 bar absolute The maximum pressure corresponds to the maximum working pres-
sure within the single operating period. The sum of the single oper-
ating periods must not exceed the total operating period.
Single operating period 5s
Total operating period 50 h
Minimum pressure (high-pressure side) 10 bar absolute Minimum pressure at the high-pressure side (A) which is required
in order to prevent damage to the axial piston unit.
Rate of pressure change R
Amax
9000bar/s Maximum permissible speed of pressure build-up and reduction
during a pressure change across the entire pressure range.
Pressure at suction port S (inlet)
Minimum pressure p
Smin
0.8 bar absolute
Minimum pressure at suction port S (inlet) which is required in order
to prevent damage to the axial piston unit. The minimum required
pressure is dependent on the rotational speed and displacement of
the axial piston unit (see diagram on page 6).
Maximum pressure p
S max
2bar absolute
▼ Rate of pressure change R
Amax
p
nom
∆t
∆p
Time t
Pressure p
▼ Pressure definition
Pressure p
t
1
t
2
t
n
Single operating period
Minimum pressure (high-pressure side)
Maximum pressure p
max
Nominal pressure p
nom
Time t
Total operating period = t
1
+ t
2
+ ... + t
n
Notice
Working pressure range valid when using hydraulic fluids
based on mineral oils. Please contact us for values for
other hydraulic fluids.
Filtration of the hydraulic fluid
Finer filtration improves the cleanliness level of the hydraulic
fluid, which increases the service life of the axial piston unit.
A cleanliness level of at least 20/18/15 is to be maintained
according to ISO4406.
At very high hydraulic fluid temperatures (90°C to maximum
103°C, measured at air bleed port R), a cleanliness level of
at least 19/17/14 according to ISO4406 is necessary.
6
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
Technical data
Technical data
Size NG 55 80 107
Displacement, geometric, per revolution
V
g max
cm
3
54.8 80 107
Rotational speed
maximum
1)
at V
gmax
n
nom
rpm 2500 2240 2150
at V
g
<0.74×V
gmax
n
max1
rpm 3400 3000 2900
Rotational speed
maximum
2)
n
max2
rpm 3750 3350 3200
Flow
at n
nom
and V
gmax
q
v
l/min 137 179 230
Power
at n
nom
, V
gmax
and Δp=350bar P
kW 80 105 134
Torque
at V
gmax
and Δp=350bar T
Nm 305 446 596
Rotary stiffness
V
gmax
to 0.5×V
gmax
c
min
Nm/rad 10594 15911 21469
0.5×V
gmax
to 0 (interpolated) c
max
Nm/rad 32103 48971 67666
Moment of inertia for rotary group
J
TW
kgm
2
0.0034 0.0066 0.0109
Maximum angular acceleration
α
rad/s² 31600 24200 19200
Case volume
V
l 0.6 0.8 1.2
Mass moment
T
G
Nm 21 32 41
Weight (approx.)
m
kg 16 21 25
▼ Maximum rotational speed (speed limit)
0.6 0.7 0.8 0.9 1.0
2.0
1.8
1.6
1.4
1.2
1.1
1.0
0.9
0.8
1.9
1.7
1.5
1.3
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
Rotational speed n/n
nom
Displacement V
g
/V
g
max
Inlet pressure p
abs
[bar]
Determining the characteristics
Flow
q
v
=
V
g
×n×η
v
[l/min]
1000
Torque
T
=
V
g
×Δp
[Nm]
20×π×η
hm
Power
P
=
2π×T×n
=
q
v
× Δp
[kW]
60000
600 × η
t
Key
V
g
Displacement per revolution [cm
3
]
Δp
Differential pressure [bar]
n
Rotational speed [rpm]
η
v
Volumetric efficiency
η
hm
Hydraulic-mechanical efficiency
η
t
Total efficiency (η
t
= η
v
×η
hm
)
Notice
▶ Theoretical values, without efficiency and tolerances;
values rounded
▶ Operation above the maximum values or below the
minimum values may result in a loss of function, a
reduced service life or in the destruction of the axial
piston unit. Other permissible limit values, such as
speed variation, reduced angular acceleration as a
function of the frequency and the permissible angular
acceleration at start (lower than the maximum angular
acceleration) can be found in data sheet 90261.
1) The values are applicable:
‒ At absolute pressure p
abs
= 1 bar at suction port S
‒ For the optimal viscosity range of ν
opt
= 36 to 16 mm
2
/s
‒ For hydraulic fluid based on mineral oils.
2) Maximum rotational speed (speed limit) for increased inlet
pressure p
abs
at suction port S and V
g
< V
g max
, see diagram.
7
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
Technical data
Permissible axial forces of the drive shaft
Size NG 55 80 107
Maximum axial force at standstill
or pressure-free operation
F
ax
+
–
+ F
ax max
N 0 0 0
− F
ax max
N 66 86 103
Notice
▶ The values given are maximum values and do not apply
to continuous operation.
▶ The permissible axial force in direction −F
ax
is to be
avoided as the service life of the bearing is reduced.
▶ Radial forces are not permissible.
8
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
DRS – Pressure controller with load sensing
DRS – Pressure controller with load sensing
Function of the pressure controller
The pressure controller limits the maximum pressure at the
pump output within the control range of the pump. The
variable pump only delivers as much hydraulic fluid as the
consumers actually need. If the working pressure exceeds
the pressure command value at the pressure valve, the
pump will regulate to a smaller displacement to reduce the
control differential.
When depressurized, the pump is swiveled to its initial
position V
gmax
by an adjustment spring.
▶ Setting range for pressure control 100 to 400 bar
▶ Standard setting 350 bar
Notice
▶ Any pressure-relief valve included in the system to limit
the maximum pressure must have its start of opening
at least 20bar above the pressure controller setting.
▶ The pressure controller overrides the load-sensing
controller, i.e. the load-sensing function operates
below the pressure command value.
▶ To ensure thermal stability, with a DRS controller
a drain line from port T to the reservoir is generally
required (not needed for EPcontrol).
When ordering, state in plain text:
▶ Pressure controller setting
▶ Δp setting for load sensing function
If there is no ordering code, the pump will be delivered
with standard settings.
Zero-stroke operation
The standard version is designed for intermittent constant
pressure operation. Short-term zero-stroke operation
(<1min) is permissible up to an working pressure of
p
nom
= 350bar at a reservoir temperature of ≤ 50°C.
Load-sensing function
The load sensing controller works as a load-pressure con-
trolled flow controller and adjusts the displacement of the
pump to the volume required by the consumer.
The flow of the pump is then dependent on the cross sec-
tion of the external metering orifice (1), which is located
between the pump and the consumer. Below the setting of
the pressure controller and within the control range of the
pump, the flow is not dependent on the load pressure.
The metering orifice is usually a separately located load-sens-
ing directional valve (control block). The position of the
directional valve spool determines the opening cross-section
of the metering orifice and thus the flow of the pump.
The load sensing controller compares the pressure before
the metering orifice with that after the orifice and maintains
the pressure drop encountered here (differential pressure Δp)
and thus the flow constant.
If the differential pressure Δp at the metering orifice rises,
the pump is swiveled back (toward V
g min
). If the differential
pressure Δp drops, the pump is swiveled out (toward V
g max
)
until equilibrium at the metering orifice is restored.
Δp
Metering orifice
= p
Pump
– p
Consumer
▶ Setting range for Δp 19 to 40 bar
▶ Standard setting 30 bar
The stand-by pressure in zero-stroke operation (metering
orifice closed) is slightly higher than the ∆p setting.
▼ Characteristic curve DRS
max. 10 bar
400
80
Working pressure p
A
[bar]
q
v min
Flow q
v
[l/min] q
v max
9
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
DRS – Pressure controller with load sensing
▼ Circuit diagram DRS
DRS (92% Scaliert + Blende ergänzet (1))
EP5 / EP6
EP1 / EP2
T
X
R
A
V
g min
V
g max
M
S
S
M
1
R
A
S
M
1
A
M
S
S
M
A
M
S
M
1
M
A
V
g min
V
g max
V
g min
V
g max
R
M
A
(1)
The metering orifice (control block) (1) is not included in
the scope of delivery.
10
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
EP – Proportional control, electric
EP – Proportional control, electric
The electric proportional control provides infinite control
of the displacement. Control is proportional to the electric
control current applied to the solenoid.
EP1, EP2 ‒ Positive control
Adjustment from V
gmin
to V
gmax
With increasing control current, the pump swivels to a
larger displacement. A control pressure is needed to swivel
the pump from its initial position V
gmin
to V
gmax
. The control
power required is drawn from the working pressure.
To enable a pressure to be built up, a residual volume of
approx. 10% of V
g max
is a fixed setting.
EP5, EP6 ‒ Negative control
Adjustment from V
g max
to V
gmin
With increasing control current, the pump swivels to a
smaller displacement. The control power required is drawn
from the working pressure.
▼ Characteristic curve EP
EP5, EP6 EP1, EP2
0 0.2 0.4 0.6 0.8 1.0
V
g min
V
g
/ V
g max
V
g max
1600
max
1400
1200
1000
800
600
400
200
800
max
700
600
500
400
300
200
100
EP5
EP1
(12 V)
EP6
EP2
(24 V)
Control current I [mA]
Technical data, solenoid EP1, EP5 EP2, EP6
Voltage 12V (±20%) 24V (±20%)
Control current
Beginning of control 400mA 200mA
End of control 1200mA 600mA
Current limit 1.54A 0.77A
Nominal resistance (at 20°C) 5.5Ω 22.7Ω
Dither frequency 100Hz 100Hz
Duty cycle 100% 100%
Type of protection: see connector version page 18
Various BODAS controllers with application software and
amplifiers are available for controlling the proportional
solenoids.
Further information can also be found on the internet at
www.boschrexroth.de/mobilelektronik.
11
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
EP – Proportional control, electric
▼ Circuit diagram EP1, EP2
DRS (92% Scaliert + Blende ergänzet (1))
EP5 / EP6
EP1 / EP2
T
X
R
A
V
g min
V
g max
M
S
S
M
1
R
A
S
M
1
A
M
S
S
M
A
M
S
M
1
M
A
V
g min
V
g max
V
g min
V
g max
R
M
A
(1)
▼ Circuit diagram EP5, EP6
DRS (92% Scaliert + Blende ergänzet (1))
EP5 / EP6
EP1 / EP2
T
X
R
A
V
g min
V
g max
M
S
S
M
1
R
A
S
M
1
A
M
S
S
M
A
M
S
M
1
M
A
V
g min
V
g max
V
g min
V
g max
R
M
A
(1)
12
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
Dimensions, size 55
Dimensions [mm]
Dimensions, size 55
DRS – Pressure controller with load sensing
M
A
T X
A
M
1
T X
A
M
S
M
A
M
1
S
M
S
S
Y
M
A
M
1
M
S
A, S
T
X
R
80
96
107
110
80
13
R120
121.5
40
12
G3/4
17
14
118
55
G1
9
15
150
211
266
132.5
242
229
232
-0.06
-0.03
ø80
4.8
91
124
122
110
32
76
180
12.5°
1.6 1.6
ø115
111
View Y
Clockwise rotation
View Y
Counter-clockwise rotation
Waist dimension
Center of gravity
13
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
Dimensions, size 55
Dimensions [mm]
EP1, EP2 – Proportional electric control, positive control
View Y
Clockwise rotation
32
26
12
131
255 (M
S
)
252 (M
A
)
242
275
19.4
132
0.5
224
M
S
M
1
S
M
A
M
S
M
1
M
A
AA, S
Y
R
Center of gravity
▼ Splined shaft similar to DIN ISO 14
E8 ‒ 8x32x35
9.5
28
36.8
55
12
26.1
M12 × 1.75
1)2)
ø34.9
-0.1
ø8.1
ø42
ø38.4
Groove for retaining ring 35 × 1.5 DIN 471
Ports Standard Size
2)
p
max abs
[bar]
3)
State
6)
A Working port DIN ISO 228 G3/4; 16 deep 400 O
S Suction port DIN ISO 228 G1; 18 deep 2 O
T Drain port (DRS only) DIN 3852
5)
M12 × 1.5; 12 deep 2 O
M
A
Measuring port pressure A DIN 3852
5)
M10 × 1; 8 deep 400 X
M
S
Measuring port suction pressure DIN 3852
5)
M10 × 1; 8 deep 2 X
M
1
Measuring port control pressure DIN 3852
5)
M12 × 1.5; 12 deep 400 X
R Air bleed port DIN 3852
5)
M18 × 1.5; 12 deep 2 X
4)
X Pilot pressure port load sensing ISO 11926
5)
7/16-20UNF-2B; 11.5 deep 400 O
1) Center bore according to DIN 332 (thread according to DIN 13)
2) For notes on tightening torques, see the instruction manual
3) Depending on the application, momentary pressure peaks can occur.
Keep this in mind when selecting measuring devices and fittings.
4) Only open port R for filling and air bleeding.
5) The countersink can be deeper than as specified in the standard.
6) O = Must be connected (plugged when delivered)
X= Plugged (in normal operation)
14
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
Dimensions, size 80
Dimensions [mm]
Dimensions, size 80
DRS – Pressure controller with load sensing
Center of gravity
T
X
R
Y
M
A
T X
A
M
1
T X
A
M
S
M
A
M
1
S
M
S
S
M
A
M
S
M
1
A, S
9
172
233
288
156
263
252
9.1
103
130
128
116
36
86
195
248
121.5
40
12
80
13
R120
80
96
107
117
-0.06
-0.03
ø80
15
12.5°
G1
G1 1/4
1814
128
60
130
1.6 1.6
111
ø130
View Y
Clockwise rotation
View Y
Counter-clockwise rotation
Waist dimension
15
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
Dimensions, size 80
Dimensions [mm]
EP1, EP2 – Proportional electric control, positive control
0.2 0.2
238
36
139
30
13
24.9
263
298
155.6
278 (M
S
)
274 (M
A
)
A, S
M
A
A
M
S
S
M
1
R
A
S
M
S
M
1
M
A
M
A
M
S
M
1
Y
View Y
Clockwise rotation
View Y
Counter-clockwise rotation
Center of gravity
▼ Splined shaft similar to DIN ISO 14
E8 ‒ 8x32x35
9.5
28
36.8
55
12
26.1
M12 × 1.75
1)2)
ø34.9
-0.1
ø8.1
ø42
ø38.4
Groove for retaining ring 35 × 1.5 DIN 471
Ports Standard Size
2)
p
max abs
[bar]
3)
State
6)
A Working port DIN ISO 228 G1; 18 deep 400 O
S Suction port DIN ISO 228 G1 1/4; 20 deep 2 O
T Drain port (DRS only) DIN 3852
5)
M12 × 1.5; 12 deep 2 O
M
A
Measuring port pressure A DIN 3852
5)
M10 × 1; 8 deep 400 X
M
S
Measuring port suction pressure DIN 3852
5)
M10 × 1; 8 deep 2 X
M
1
Measuring port control pressure DIN 3852
5)
M12 × 1.5; 12 deep 400 X
R Air bleed port DIN 3852
5)
M18 × 1.5; 12 deep 2 X
4)
X Pilot pressure port load sensing ISO 11926
5)
7/16-20UNF-2B; 11.5 deep 400 O
1) Center bore according to DIN 332 (thread according to DIN 13)
2) For notes on tightening torques, see the instruction manual
3) Depending on the application, momentary pressure peaks can occur.
Keep this in mind when selecting measuring devices and fittings.
4) Only open port R for filling and air bleeding.
5) The countersink can be deeper than as specified in the standard.
6) O = Must be connected (plugged when delivered)
X= Plugged (in normal operation)
16
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
Dimensions, size 107
Dimensions [mm]
Dimensions, size 107
DRS – Pressure controller with load sensing
80
96
107
124
9
15
186
249
309
166.7
282
252
264
-0.06
-0.03
ø80
80
13
R120
G1 1/4
19.5
14
134
63
121.5
40
12
108
136
134
126
40
91
206
12.2
12.5°
1.3 1.3
ø140
111
G1
T
X
R
S
A
M
A
M
S
A, S
M
1
T X
M
A
M
S
M
1
S
A
T X
M
A
M
S
M
1
Y
View Y
Clockwise rotation
View Y
Counter-clockwise rotation
Waist dimension
Center of gravity
17
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
Dimensions, size 107
Dimensions [mm]
EP1, EP2 – Proportional electric control, positive control
View Y
Clockwise rotation
View Y
Counter-clockwise rotation
Center of gravity
166.8
287 (M
A
)
283 (M
S
)
282 (A, S)
319
249
26.5
40
35
14
0.20.2
145
R
A, S
M
A
M
S
M
1
M
A
A
M
S
M
1
S
M
A
A
M
S
M
1
S
Y
▼ Splined shaft similar to DIN ISO 14
E8 ‒ 8x32x35
9.5
28
36.8
55
12
26.1
M12 × 1.75
1)2)
ø34.9
-0.1
ø8.1
ø42
ø38.4
Groove for retaining ring 35 × 1.5 DIN 471
Ports Standard Size
2)
p
max abs
[bar]
3)
State
6)
A Working port DIN ISO 228 G1; 18 deep 400 O
S Suction port DIN ISO 228 G1 1/4; 20 deep 2 O
T Drain port (DRS only) DIN 3852
5)
M12 × 1.5; 12 deep 2 O
M
A
Measuring port pressure A DIN 3852
5)
M10 × 1; 8 deep 400 X
M
S
Measuring port suction pressure DIN 3852
5)
M10 × 1; 8 deep 2 X
M
1
Measuring port control pressure DIN 3852
5)
M12 × 1.5; 12 deep 400 X
R Air bleed port DIN 3852
5)
M18 × 1.5; 12 deep 2 X
4)
X Pilot pressure port load sensing ISO 11926
5)
7/16-20UNF-2B; 11.5 deep 400 O
1) Center bore according to DIN 332 (thread according to DIN 13)
2) For notes on tightening torques, see the instruction manual
3) Depending on the application, momentary pressure peaks can occur.
Keep this in mind when selecting measuring devices and fittings.
4) Only open port R for filling and air bleeding.
5) The countersink can be deeper than as specified in the standard.
6) O = Must be connected (plugged when delivered)
X= Plugged (in normal operation)
18
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
Connector for solenoids
Dimensions [mm]
Connector for solenoids
DEUTSCH DT04-2P-EP04
Molded connector, 2-pin, without bidirectional suppressor
diode
There is the following type of protection with the installed
mating connector:
▶ IP67 (DIN/EN 60529) and
▶ IP69K (DIN 40050-9)
▼ Switching symbol
▼ Mating connector DEUTSCH DT06-2S-EP04
Consisting of DT designation
1 housing DT06-2S-EP04
1 wedge W2S
2 sockets 0462-201-16141
The mating connector is not included in the scope of delivery.
This can be supplied by Bosch Rexroth on request (material
number R902601804).
Notice
▶ If necessary, you can change the position of the
connector by turning the solenoid.
▶ The procedure is defined in the instruction manual.
Speed sensors DSA and DSM
A signal proportional to the rotational speed of the pump
can be generated with the fitted DSA/DSM speed sensor.
The DSA/DSM sensor measures the rotational speed and
direction of rotation.
Type code, technical data, dimensions and details on
the connector, plus safety instructions about the sensor
can be found in the relevant data sheet 95133 (DSA)
and 95132 (DSM).
The sensor is mounted on the port provided for this
purpose with a mounting bolt.
Size 80
Number of teeth 21
▼ Circuit diagram
T
2
T
1
U
n
Dimensions
Air bleed port R
M10 × 1; 8 deep
89.4
85
19
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
Accessories
Dimensions [mm]
Accessories
Suction adapter
▼ Dimensions
E
F
SW
C
A
D
B
SW
D
B
C
A
E
F
G
D
B
C
A
E
F
G
SW
H
K
J
H
K
J
J
H
K
Axial piston unit Suction adapter
NG
Port S
Inner ⌀ Version Material
number
A
B [in] B [mm] øC øD E F G SW H J K
55 G1 1 1/2 39 Straight R902600251 23.5 33.5 72 54 ‒ 41 301 44 63
55 G1 2 51 R902602028 26 44 82 64 ‒ 55 312 47 70
80 G1 1/4 2 51 R902600252 30 44 85 65 ‒ 55 335 51 76
107 354 55 79
107 G1 1/4 2 1/2 63 R902601630 31 54 82 64 ‒ 65 354 54 79
55 G1 1 1/2 39 45° R909831600 26 31 101 82 45 41 342 7 59
55 G1 2 51 R902602029 26 43 100 81 44 41 344 7 61
80 G1 1/4 2 51 R909831597 34 43 101 81 40 50 364 15 68
107 383 18 71
107 G1 1/4 2 1/2 63 R902601631 35 54 100 81 44 50 387 14 74
55 G1 1 1/2 39 90° R909831599 26 31 64 44 85 41 321 41 56
55 G1 2 51 R902602030 26 43 62 42 81 41 324 38 58
80 G1 1/4 2 51 R909831598 35 43 63 43 80 50 346 33 66
107 365 29 70
When ordering, quote the material number of the
version required
20
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
Accessories
Dimensions [mm]
Notes on suction line
▶ Keep as short and straight as possible, without sharp bend
▶ Use a supporting ring for plastic hoses
▶ Use two hose clamps to protect the suction hose against
air suction
▶ Note pressure resistance of suction hose compared to
ambient pressure
Replacing seals
The O-rings used as seals to prevent air from entering the
suction line are to be replaced after every removal and new
installation in order to guarantee complete sealing.
Material number for O-rings:
▶ R909083802: O-ring for suction adapter G1
▶ R909083808: O-ring for suction adapter G1 1/4
Coupling flange
There are special, modified coupling flanges in 4-hole and
6-hole design for the cardan shaft drive.
The coupling flange is not included in the scope of delivery
and must be ordered separately.
▼ 4-hole coupling flange, complete – ø90
Material number: R902060152
ø90
ø47
-0.025
2.3 6
48.2
42.5
ø8.5
ø74.5
M12 × 35 - 10.9
0
60.7
Socket-head screw DIN 912
max. 60.7
▼ 6-hole coupling flange, complete – ø100
Material number: R902060153
ø99
2.3 7
48.2
42.5
ø8.5
ø84
M12 × 35 - 10.9
ø57
-0.046
0
60.7
Socket-head screw DIN 912
max. 60.7
Notice
▶ Assembly of the coupling flange is to be carried out by
pulling it onto the drive shaft with the aid of the
threaded bore in the drive shaft end.
▶ The coupling flange must be clamped on the drive
shaft using a socket-head screw. In addition, permanent
lubrication should be applied between the drive shaft
and the coupling flange.
▶ The socket-head screw should be secured in a suitable
manner (e.g. gluing with Loctite 276) and tightened
with a tightening torque of 130Nm.
▶ Sudden axial impact upon the drive shaft will lead to
rotary group damage and therefore must be avoided.
21
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
Installation instructions
Installation instructions
General
During commissioning and operation, the axial piston unit
must be filled with hydraulic fluid and air bled. This must
also be observed following a longer standstill as the axial
piston unit may empty via the hydraulic lines.
The pump housing is internally connected to the suction
chamber. A separate drain line from the housing to the
reservoir is not required. Exception: To ensure thermal
stability, a drain line from port T to the reservoir is generally
required with the DRS controller.
To achieve favorable noise values, decouple all connecting
lines using elastic elements and avoid above-reservoir
installation.
Under all operating conditions, the suction line and drain
line must flow into the reservoir below the minimum fluid
level. The permissible suction height h
S
results from the
total pressure loss. However, it must not be higher than
h
Smax
=800 mm. The minimum suction pressure at port S
must not fall below 0.8bar absolute during operation and
during cold start.
When designing the reservoir, ensure that there is adequate
distance between the suction line and the drain line. This
minimizes oil turbulence and carries out degassing, which
prevents the heated hydraulic fluid from being sucked
directly back in again.
Key
F Filling / air bleeding
R Air bleed port
S Suction port
T Drain port (DRSonly)
M
S
Measuring port suction pressure
SB Baffle (baffle plate)
h
t min
Minimum required immersion depth (200mm)
h
min
Minimum required distance to reservoir bottom (100mm)
h
S max
Maximum permissible suction height (800mm)
Notice
Port F is part of the external piping and must be provided
on the customer side to make filling and air bleeding
easier.
Installation position
See the following examples 1 to 4.
Further installation positions are available upon request.
Recommended installation position: 1 and 2.
Below-reservoir installation (standard)
Below-reservoir installation means that the axial piston unit
is installed outside of the reservoir and below the minimum
fluid level of the reservoir.
Installation position Air bleed Filling
1
S
SB
T
R
h
t min
h
min
R S
2
S
M
S
T
h
t min
h
min
M
S
S
Above-reservoir installation
Above-reservoir installation means that the axial piston unit
is installed above the minimum fluid level of the reservoir.
Observe the maximum permissible suction height
h
Smax
=800mm.
Installation position Air bleed Filling
3
S
SB
T
R
F
h
t min
h
min
h
S max
R F
4
S
M
S
SB
T
F
h
t min
h
min
h
S max
M
S
F
22
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
Other related documents
Other related documents
Other pumps with special characteristics and dimensions
for use in commercial vehicles can be found in the following
data sheets:
▶ 91510: Fixed pump A17FNO, 250/300 bar
▶ 91520: Fixed pump A17FO, 350/400 bar
▶ 92280: Variable pump, A18VLO 350/400 bar
23
RE 92270/06.2018, Bosch Rexroth AG
Axial piston variable pump | A18VO Series 11
Project planning notes
Project planning notes
▶ The A18VO pump is designed to be used in open circuits.
▶ The project planning, installation and commissioning of
the axial piston unit requires the involvement of quali-
fied skilled personnel.
▶ Before using the axial piston unit, please read the corre-
sponding instruction manual completely and thoroughly.
If necessary, this can be requested from Bosch Rexroth.
▶ Before finalizing your design, please request a binding
installation drawing.
▶ The specified data and notes contained herein must be
observed.
▶ Depending on the operating conditions of the axial
piston unit (working pressure, fluid temperature),
the characteristic curve may shift.
▶ Preservation: Our axial piston units are supplied as
standard with preservative protection for a maximum
of 12 months. If longer preservative protection is
required (maximum 24 months), please specify this in
plain text when placing your order. The preservation
periods apply under optimal storage conditions, details
of which can be found in the data sheet 90312 or in the
instruction manual.
▶ Not all versions of the product are approved for use in a
safety function according to ISO13849. Please consult the
responsible contact person at Bosch Rexroth if you require
reliability parameters (e.g. MTTF
d
) for functional safety.
▶ Depending on the type of control used, electromagnetic
effects can be produced when using solenoids. When a
direct current is applied, solenoids do not cause electro-
magnetic interference nor is their operation impaired by
electromagnetic interference. Other behavior can result
when a modulated direct current (e.g. PWM signal) is
applied. Potential electromagnetic interference for per-
sons (e.g. persons with a pacemaker) and other compo-
nents must be tested by the machine manufacturer.
▶ Pressure controllers are not safeguards against pressure
overload. Be sure to add a pressure relief valve to the
hydraulic system.
▶ Working ports:
– The ports and fastening threads are designed for the
specified maximum pressure. The machine or system
manufacturer must ensure that the connecting ele-
ments and lines correspond to the specified applica-
tion conditions (pressure, flow, hydraulic fluid, tem-
perature) with the necessary safety factors.
– The working ports and function ports are only
intended to accommodate hydraulic lines.
Safety instructions
▶ During and shortly after operation, there is a risk of
getting burnt on the axial piston unit and especially on
the solenoids. Take the appropriate safety measures
(e.g.by wearing protective clothing).
▶ Moving parts in control equipment (e.g.valve spools) can,
under certain circumstances, get stuck in position as a
result of contamination (e.g.contaminated hydraulic fluid,
abrasion, or residual dirt from components). As a result,
the hydraulic fluid flow and the build-up of torque in the
axial piston unit can no longer respond correctly to the
operator's specifications. Even the use of various filter
elements (external or internal flow filtration) will not rule
out a fault but merely reduce the risk. The machine/system
manufacturer must test whether additional measures are
required on the machine for the relevant application in
order to bring the driven consumer into a safe position
(e.g.safe stop) and ensure any measures are properly
implemented.
24
Bosch Rexroth AG, RE 92270/06.2018
A18VO Series 11 | Axial piston variable pump
Project planning notes
Bosch Rexroth AG
Glockeraustraße 4
89275 Elchingen, Germany
Phone: +49 7308 82-0
info.ma@boschrexroth.de
www.boschrexroth.com
©BoschRexrothAG2018. All rights reserved, also regarding any disposal,
exploitation, reproduction, editing, distribution, as well as in the event of
applications for industrial property rights. The data specified within only
serves to describe the product. No statements concerning a certain condition
or suitability for a certain application can be derived from our information.
The information given does not release the user from the obligation of own
judgment and verification. It must be remembered that our products are
subject to a natural process of wear and aging.