Linear Motion and
Assembly Technologies ServicePneumaticsHydraulics
Electric Drives
and Controls
Data sheet
Features
Variable axial piston pump of swashplate design for hydro- –
static drives in closed circuit
The flow is proportional to the drive speed and displacement. –
The flow increases as the angle of the swashplate is adjust- –
ed from zero to its maximum value.
Flow direction changes smoothly when the swashplate is –
moved through the neutral position.
Two pressure-relief valves are provided on the high pressure –
ports to protect the hydrostatic transmission (pump and mo-
tor) from overload.
The high-pressure relief valves also function as boost valves. –
The integrated boost pump acts as a feed pump and control –
pressure supply.
The maximum boost pressure is limited by a built-in boost –
pressure-relief valve.
RE 92013/06.09 1/24
Replaces: 04.08
Axial Piston Variable Pump
A4VTG
Series 33
Sizes NG71, 90
Nominal pressure 400 bar
Maximum pressure 450 bar
Closed circuit
For the drum drive in mobile concrete mixers
Inhalt
Ordering code for standard program 2
Technical data 4
HW – Proportional control hydraulic, mechanical servo 9
EP – Proportional control electric 10
Dimensions size 71 12
Dimensions size 90 14
Through drive dimensions 16
Overview of attachments 17
High-pressure relief valves 17
Mechanical stroke limiter 18
Ports X
3
and X
4
for stroking chamber pressure 18
Filtration boost circuit 19
Connector for solenoids 20
Installation situation for coupling assembly 21
Installation instructions 22
General instructions 24
2/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
Ordering code for standard program
A4VT G / 33 M N C4 F A S
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18
Axial piston unit
01
Swashplate design, variable, nominal pressure 400 bar, maximum pressure 450 bar, mobile concrete mixers
A4VT
Operation mode
02
Pump, closed circuit
G
Size
03
Displacement V
g max
in cm
3
071 090
Control device 071 090
04
Proportional control hydraulic, mechanical servo, hexagon shaft with lever to the rear
HW1
1)
Proportional control electric,
with emergency actuation and spring return
U = 12 V DC
EP3
U = 24 V DC
EP4
Connector for solenoids
2)
071 090
05
Without
0
DEUTSCH - molded connector, 2-pin – without suppressor diode
P
Auxiliary functions 071 090
06
Without
0
With mechanical stroke limiter, externally adjustable
M
With ports X
3
, X
4
for stroking chamber pressure
T
With mechanical stroke limiter and ports X
3
, X
4
B
Series
07
Series 3, Index 3
33
Version of port and fixing threads
08
Metric
M
Direction of rotation
09
Viewed from drive shaft
clockwise
R
counter-clockwise
L
Seals
10
NBR (nitrile-caoutchouc), shaft seal ring in FKM (fluor-caoutchouc)
N
Mounting flange
11
SAE J744, 127-4
C4
Drive shaft 071 090
12
Splined shaft
ANSI B92.1a–1976
1 3/8 in 21T 16/32DP
without coupling flange
– V8
with coupling flange
– C8
1 1/2 in 23T 16/32DP
without coupling flange
–
V9
with coupling flange
–
C9
Service line ports 071 090
13
SAE flange port
A and B on same side
left Suction port S at bottom
m m
1
right Suction port S at top
2
Mounting position of the lever not specified on delivery, to be aligned by the customer
1)
Connectors for other electric components can deviate.2)
= Available m = On request – = Not available
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 3/24
Ordering code for standard program
A4VT G / 33 M N C4 F A S
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18
Boost pump
14
With integrated boost pump
F
Through drive
15
Flange SAE J744 Coupling for splined shaft
1)
Mounting variant
Diameter
Symbol Designation
Diameter Designation
071 090
Without
0000
82-2
A2 5/8 in 9T 16/32DP S2
A2S2
101-2
B2 7/8 in 13T 16/32DP S4
B2S4
High-pressure valves
16
With high-pressure relief valve, direct controlled
A
Filtration boost circuit
17
Filtration in the boost pump suction line
S
Standard / special version
18
Standard version
-0
combined with attachment part or attachment pump
-K
Special version
-S
combined with attachment part or attachment pump
-T
Note
Short designation X refers to a special version not covered by the ordering code.
Coupling for splined shaft acc. ANSI B92.1a-1976
3)
= Available m = On request – = Not available
4/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
Hydraulic fluid
Before starting project planning, please refer to our data
sheets RE 90220 (mineral oil) and RE 90221 (environmentally
acceptable hydraulic fluids) for detailed information regarding
the choice of hydraulic fluids and application conditions.
The A4VTG variable pump is not suitable for operation with
HFA, HFB and HFC. If HFD or environmentally acceptable hy-
draulic fluids are being used, the limitations regarding technical
data and seals must be observed.
Please contact us.
When ordering, indicate the hydraulic fluid that is to be used.
Selection diagram
t
min
= -40 °C t
max
= +115 °C
-40° -25° -10° 10° 30° 50° 90° 115 °70°
0°
5
10
40
60
20
100
200
400
600
1000
1600
-40° 0° 20° 40° 60° 80° 100° -20°
1600
opt
16
36
VG 22
VG 32
VG 46
VG 68
VG 100
5
Hydraulic fluid temperature range
Temperature t [°C]
Viscosity ν [mm
2
/s]
Details regarding the choice of hydraulic fluid
The correct choice of hydraulic fluid requires knowledge of the
operating temperature in relation to the ambient temperature: in
a closed circuit the circuit temperature.
The hydraulic fluid should be chosen so that the operating vis-
cosity in the operating temperature range is within the optimum
range (ν
opt
), see shaded area of the selection diagram. We
recommended that the higher viscosity class be selected in
each case.
Example: At an ambient temperature of X °C, an operating
temperature of 60 °C is set in the circuit. In the optimum oper-
ating viscosity range (ν
opt.
shaded area), this corresponds to the
viscosity classes VG 46 or VG 68; to be selected: VG 68.
Note
The case drain temperature, which is affected by pressure and
speed, is always higher than the circuit temperature. At no
point of the component may the temperature be higher than
115 °C, however. The temperature difference specified below
is to be taken into account when determining the viscosity in
the bearing.
If the above conditions cannot be maintained due to extreme
operating parameters, please contact us.
Technical data
Viscosity and temperature
Viscosity [mm
2
/s] Temperature Comment
Storage T
min
≥ -50 °C
T
opt
= +5 °C to +20 °C
up to 12 months with standard factory conservation
up to 24 months with long-term factory conservation
(Cold) start-up
1)
ν
max
= 1600 T
St
≥ -40 °C t ≤ 3 min, without load (p ≤ 50 bar), n ≤ 1000 rpm
Permissible tempera-
ture difference
DT ≤ 25 K between axial piston unit and hydraulic fluid
Warm-up phase ν < 1600 to 400 T = -40 °C to -25 °C at p
nom
, 0.5 • n
nom
and
t ≤ 15 min
Operating phase
Temperature
difference
DT = approx. 5 K The temperature of the hydraulic fluid in the bearing
is (depending on pressure and speed) approx. 5 K
higher than that of the case drain fluid at port T.
Continuous operation ν = 400 to 10
ν
opt
= 16 to 36
T = -25 °C to +90 °C no restriction within the permissible data
Short-term operation ν
min
= < 10 to 5 T
max
= +115 °C t < 3 min, p < 0.3 • p
nom
Shaft seal ring FKM
1)
T ≤ +115 °C see page 5
At temperatures below -25 °C, an NBR shaft seal ring is required
1)
(permissible temperature range: -40 °C to +90 °C)
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 5/24
Shaft seal ring
Permissible pressure loading
The service life of the shaft seal ring is affected by the speed of
the pump and the case drain pressure. It is recommended that
the average, continuous case drain pressure 3 bar absolute
at operating temperature not be exceeded (maximum permis-
sible case drain pressure 6 bar absolute at reduced speed,
see diagram). Short-term (t < 0.1 s) pressure spikes of up to
10 bar absolute are permitted. The service life of the shaft seal
ring decreases with an increase in the frequency of pressure
spikes.
The case pressure must be equal to or greater than the exter-
nal pressure on the shaft seal ring.
1000
1
2
3
4
5
6
2000 3000 4000 5000
NG90
Perm. pressure p
abs max
[bar]
Speed n [rpm]
NG71, 90
NG71
Temperature range
The FKM shaft seal ring may be used for case drain tempera-
tures from -25 °C to +115 °C.
Note
For application cases below -25 °C, an NBR shaft seal ring is
necessary (permissible temperature range: -40 °C to +90 °C).
State NBR shaft seal ring in plain text when ordering.
Please contact us.
Filtration of the hydraulic fluid
Filtration improves the cleanliness level of the hydraulic fluid,
which, in turn, increases the service life of the axial piston unit.
To ensure the functional reliability of the axial piston unit, a
gravimetric evaluation is necessary for the hydraulic fluid to
determine the amount of contamination by solid matter and
to determine the cleanliness level according to ISO 4406. A
cleanliness level of at least 20/18/15 is to be maintained.
Depending on the system and the application, for the A4VTG,
we recommend
Filter cartridges β
20
≥ 100.
With an increasing differential pressure at the filter cartridges,
the β-value must not deteriorate.
At very high hydraulic fluid temperatures (90 °C to maximum
115 °C), a cleanliness level of at least 19/17/14 according to
ISO 4406 is necessary.
If the above classes cannot be achieved, please contact us.
For notes on filtration types, see page 16.
Technical data
6/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
Operating pressure range
Pressure at service line port A or B
Nominal pressure p
nom
_________________ 400 bar absolute
Maximum pressure p
max
_______________ 450 bar absolute
Single operating period ____________________________ 10 s
Total operating period _____________________________ 300 h
Minimum pressure (high-pressure side) __________ 25 bar
Minimum pressure (inlet) ________________________10 bar
(boost pressure setting must be higher depending on system)
Rate of pressure change R
A max
_______________ 9000 bar/s
p
nom
Dt
Dp
Time t
Pressure p
Boost pump
Pressure at suction port S
Duration p
S min
(ν ≤ 30 mm
2
/s) ___________≥ 0.8 bar absolute
at cold starts, short-term (t < 3 min) _______≥ 0.5 bar absolute
Maximum p
S max
_________________________ ≤ 5 bar absolute
Standard adjustment p
Sp
(at n = 1500 rpm) ________ 22 bar
Nominal pressure p
Sp nom
_______________________ 30 bar
Maximum pressure p
Sp max
______________________ 40 bar
Control pressure
To ensure the function of the control, the following control
pressure is required depending on the speed and operating
pressure (measurement point, port P
S
):
For controls EP and HW
Minimum control pressure p
St min
(at n = 1500 rpm) ___ 22 bar
Definition
Nominal pressure p
nom
The nominal pressure corresponds to the maximum design
pressure.
Maximum pressure p
max
The maximum pressure corresponds the maximum operating
pressure within the single operating period. The sum of the
single operating period must not exceed the total operating
period.
Minimum pressure (high-pressure side)
Minimum pressure on the high-pressure side (A or B) that is
required in order to prevent damage to the axial piston unit.
Minimum pressure (inlet)
Minimum pressure in inlet (A or B) that is required in order to
prevent damage to the axial piston unit.
Rate of pressure change R
A
Maximum permissible rate of pressure build-up and pressure
reduction during a pressure change over the entire pressure
range.
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
Technical data
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 7/24
Table of values (theoretical values, without efficiency levels and tolerances; values rounded)
Size NG 71 90
Displacement
variable pump V
g max
cm
3
71 90
boost pump (at p = 20 bar) V
g Sp
cm
3
20.5 27
Speed
at V
g max
n
nom
rpm 3300 3050
minimum n
min
rpm 500 500
Flow at n
nom H
and V
g max
q
v max
l/min 234 275
Power
1)
at n
nom H
, V
g max
Dp = 400 bar P
max
kW 156 183
Torque
1)
at V
g max
and Dp = 400 bar T
max
Nm 452 573
Dp = 100 bar T Nm 113 143
Rotary stiffness
drive shaft V8 c Nm/rad 120900 –
drive shaft V9 c Nm/rad – 150896
Moment of inertia for rotary group J
GR
kgm
2
0.0097 0.0149
Maximum angular acceleration
2)
a
rad/s
2
21000 18000
Filling capacity V L 1.3 1.2
Mass approx. (without through drive) m kg 51 53
Without boost pump
1)
The area of validity lies between the minimum required and maximum permissible speed. 2)
It applies for external stimuli (e. g. engine 2 to 8 times rotary frequency, cardan shaft twice the rotary frequency).
The limit value applies for a single pump only.
The load capacity of the connection parts must be considered.
Note
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. We recommend testing the loads by means of experiment or calculation / simulation and
comparison with the permissible values.
Determining the size
Flow q
v
=
V
g
• n • η
v
[L/min]
1000
Torque T =
V
g
• Dp
[Nm]
20 • π • η
mh
Power P =
2 π • T • n
=
q
v
• Dp
[kW]
60000 600 • η
t
V
g
= Displacement per revolution in cm
3
Dp = Differential pressure in bar
n
= Speed in rpm
η
v
= Volumetric efficiency
η
mh
= Mechanical-hydraulic efficiency
η
t
= Total efficiency (η
t
= η
v
• η
mh
)
Technical data
8/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
Permissible radial and axial loading on drive shaft
Size NG 71 90
Drive shaft in 1 3/8 1 1/2
Radial force maximum
at distance a
(from shaft collar)
a
F
q
F
q max
N
5600 7100
a mm 24 24
Axial force maximum
+
—
F
ax
+F
ax max
N 4242 4330
–
Fax max
N 2758 2670
Note
Special requirements apply in the case of belt drives. Please contact us.
Force-transfer direction of the permissible axial force:
+ F
ax max
= Increase in service life of bearings
–
F
ax max
= Reduction in service life of bearings (avoid)
Permissible input and through-drive torques
Size NG 71 90
Torque at V
g max
and Dp = 400 bar)
1)
T
max
Nm 452 573
Input torque
at drive shaft, maximum
2
)
V8
1 3/8 in T
E max
Nm 970
–
V9
1 1/2 in T
E max
Nm
–
1305
Maximum through-drive torque T
D max
Nm 250 250
Efficiency not considered
1)
For drive shafts with no radial force2)
Technical data
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 9/24
The output flow of the pump can be steplessly varied in the
range between 0 to 100 %, proportional to the rotation of the
control lever between 0° and ±29°.
A feedback lever connected to the stroke piston maintains the
pump flow for any given position of the control lever between
0° and 29°.
[°]
0 0.2 0.4 0.6 0.8 1.00.20.40.60.81.0
40
35
30
25
20
15
10
5
0
5
10
15
20
25
30
35
40
V
g
V
g max
V
g
V
g max
[°]
Swivel angle β at the control lever for deflection:
Start of control at β = 3°
End of control at β = 29° (maximum displacement V
g max
)
Mechanical stop for β: ±40°
The maximum required torque at the lever is 170 Ncm.
To prevent
damage to the HW control unit, a positive mechanical stop
must be provided for the HW control lever.
Note
Spring centering enables the pump, depending on pressure
and speed, to move automatically to the neutral position
(V
g
= 0) as soon as there is no longer any torque on the control
lever of the HW control unit (regardless of deflection angle).
Assignment
Direction of rotation - Control - Flow direction
Lever
direction
Control
pressure
Flow
direction
Operating
pressure
Direction of rotation
clock-
wise
a X
2
B to A M
A
b X
1
A to B M
B
counter-
clockwise
a X
2
A to B M
B
b X
1
B to A M
A
B
A
X
1
a
b
M
A
M
B
X
2
Circuit diagram
R
T1
X1
X2
PS BMB
AMAST2
b
a
HW – Proportional control hydraulic, mechanical servo
10/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
The output flow of the pump can be steplessly varied in the
range between 0 to 100 %, proportional to the electrical cur-
rent supplied to solenoid a or b.
The electrical energy is converted into a force acting on the
control piston. This control piston then directs control hydraulic
fluid into and out of the stroke cylinder to adjust pump dis-
placement as required.
A feedback lever connected to the stroke piston maintains the
pump flow for any given current within the control range.
(solenoid a)
(solenoid b)
I [mA]
EP3
EP4
EP3
EP4
I [mA]
0.2 0.4 0.6 0.8 1.00.40.60.81.0
120 0
1000
800
600
400
200
0
00.2
V
g
V
g max
V
g
V
g max
200
400
600
800
1000
120 0
Technical data, solenoid EP3 EP4
Voltage 12 V (±20 %) 24 V (±20 %)
Start of control at V
g 0
400 mA 200 mA
End of control at V
g max
1200 mA 600 mA
Limiting current 1.54 A 0.77 A
Nominal resistance (at 20 °C) 5.5 Ω 22.7 Ω
Dither frequency 100 Hz 100 Hz
Actuated time 100 % 100 %
Type of protection see connector design, page 20
The following electronic controllers and amplifiers are available
for controlling the proportional solenoids:
BODAS controller RC –
Series 20 _________________________________ RE 95200
Series 21 __________________________________ RE 95201
Series 22 _________________________________ RE 95202
Series 30 _________________________________ RE 95203
and application software
Analog amplifier RA – _________________________ RE 95230
Further information can also be found on the Internet at
www.boschrexroth.com/mobile-electronics.
Assignment
Direction of rotation – Control – Flow direction
Actuation of
solenoid
Control
pressure
Flow direction
Operating
pressure
Direction of rotation
clock-
wise
b X
2
B to A M
A
a X
1
A to B M
B
counter-
clockwise
b X
2
A to B M
B
a X
1
B to A M
A
M
A
M
B
A
B
X
2
X
1
Solenoid a
Solenoid b
EP – Proportional control electric
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 11/24
Circuit diagram
b
a
R
T1
X1
X2
PS BMB
AMAST2
Note
The spring return feature in the control unit is not a safety
device
The spool valve inside the control unit can get stuck in an
undefined position by internal contamination (contaminated
hydraulic fluid, abrasion or residual contamination from
system components). As a result, the axial piston unit can no
longer supply the flow specified by the operator.
Check whether your application requires that remedial mea-
sures be taken on your machine in order to bring the driven
consumer into a safe position (e. g. immediate stop).
EP – Proportional control electric
12/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
Dimensions size 71
HW – Proportional control hydraulic, mechanical servo
Standard: suction port S at top (02)
Option: suction port S at bottom (01): port plate turned through 180°
Before finalizing your design, request a binding
installation drawing. Dimensions in mm.
27
T
1
50
63163.3
9
P
S
8
A XS
15
12.7
ø127
-0.063
152.5
15 7. 3
229
B
T
2
295.1
42
53
42
77
103
166.2
147.5
107.5
T
1
R
X
1
X
2
114. 5
83
90
118 .1
83 (T
1
)
6
1)
118.5
14.4
114.5
T
2
M
B
ø25
57.2
2 7. 8
40°
40°
20
a
b
S
R X
1
79
79
121.8
238.5
M
A
X
2
P
S
107.5
ø8
53
17
1)
147
1)
122.5
151.7
125.2
125.2
Detail X
Port A/B
EP – Proportional control electric
Center of gravity1)
Note
Mounting position of the lever not specified on delivery,
to be aligned by the customer
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 13/24
Drive shaft
C8
Splined shaft 1 3/8 in
with coupling flange
V8
Splined shaft 1 3/8 in
21T 16/32DP
1)
(SAE J744)
60°
ø100
30°
60°
M8 x 1.25
2)
72
62
10
ø8.4
ø84
A
A
56.2
ø81
28
40
7/16-14UNC-2B
ø45
48
9.5
Ports
Designation Port for Standard Size
2)
Maximum pressure
[bar]
3)
State
A, B
Service line SAE J518
4)
1 in 450 O
Fixing thread A/B DIN 13 M12 x 1.75; 17 deep
S Suction DIN 3852 M42 x 2; 20 deep 5 O
T
1
Tank DIN 3852 M26 x 1.5; 16 deep 3 O
5)
T
2
Tank DIN 3852 M26 x 1.5; 16 deep 3 X
5)
R Air bleed DIN 3852 M12 x 1.5; 12 deep 3 X
X
1
, X
2
Control pressure
(upstream of orifice)
DIN 3852 M12 x 1.5; 12 deep 40 X
X
3
, X
4
6)
Stroking chamber pressure DIN 3852 M12 x 1.5; 12 deep 40 X
P
S
Pilot pressure, inlet DIN 3852 M14 x 1.5; 12 deep 40 X
M
A
,
M
B
Measuring pressure A, B DIN 3852 M12 x 1.5; 12 deep 450 X
ANSI B92.1a-1976, 30° pressure angle, flat root, side fit, tolerance class 5
1)
Observe the general instructions on page 24 for the maximum tightening torques.2)
Short-term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and fittings.3)
Only dimensions according to SAE J5184)
Depending on installation position, T5)
1
or T
2
must be connected (see also page 22).
Optional, see page 18
6)
O = Must be connected (plugged on delivery)
X = Plugged (in normal operation)
Dimensions size 71
Before finalizing your design, request a binding
installation drawing. Dimensions in mm.
14/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
Dimensions size 90
HW – Proportional control hydraulic, mechanical servo
Standard: suction port S at top (02)
Option: suction port S at bottom (01): port plate turned through 180°
Before finalizing your design, request a binding
installation drawing. Dimensions in mm.
2 7. 8
ø25
57.2
114. 5
83
118 .1
M
B
90
T
2
147.5
83 (T
1
)
118.5
R
X
1
X
2
6
1)
14.4
114.5
107.5
T
1
77
53
53
103
42
42
17
1)
166.2
152.5
229
B
T
2
ø127
-0.063
15
15 7. 3
12.7
27
50
63163.3
9
ø8
A
X
S
P
S
8
79
79
R
X
1
S
40°
40°
238.5
121.8
P
S
M
A
X
2
20
147
1)
300.6
a
b
107.5
T
1
122.5
151.7
125.2
125.2
Detail X
Port A/B
EP – Proportional control electric
Center of gravity1)
Note
Mounting position of the lever not specified on delivery,
to be aligned by the customer
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 15/24
Drive shaft
C9
Splined shaft 1 1/2 in
with coupling flange
V9
Splined shaft 1 1/2 in
23T 16/32DP
1)
(SAE J744)
60°
ø100
30°
60°
M8 x 1.25
2)
72
62
10
ø8.4
ø84
A
A
56.2
ø81
28
40
7/16-14UNC-2B
ø50
48
9.5
Ports
Designation Port for Standard Size
2)
Maximum pressure
[bar]
3)
State
A, B Service line SAE J518
4)
1 in 450 O
Fixing thread A/B DIN 13 M12 x 1.75; 17 deep
S Suction DIN 3852 M42 x 2; 20 deep 5 O
T
1
Tank DIN 3852 M26 x 1.5; 16 deep 3 O
5)
T
2
Tank DIN 3852 M26 x 1.5; 16 deep 3 X
5)
R Air bleed DIN 3852 M12 x 1.5; 12 deep 3 X
X
1
, X
2
Control pressure
(upstream of orifice)
DIN 3852 M12 x 1.5; 12 deep 40 X
X
3
, X
4
6)
Stroking chamber pressure DIN 3852 M12 x 1.5; 12 deep 40 X
P
S
Pilot pressure, inlet DIN 3852 M14 x 1.5; 12 deep 40 X
M
A
,
M
B
Measuring pressure A, B DIN 3852 M12 x 1.5; 12 deep 450 X
ANSI B92.1a-1976, 30° pressure angle, flat root, side fit, tolerance class 5
1)
Observe the general instructions on page 24 for the maximum tightening torques.2)
Short-term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and fittings.3)
Only dimensions according to SAE J5184)
Depending on installation position, T5)
1
or T
2
must be connected (see also page 22).
Optional, see page 18
6)
O = Must be connected (plugged on delivery)
X = Plugged (in normal operation)
Before finalizing your design, request a binding
installation drawing. Dimensions in mm.
Dimensions size 90
16/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
Before finalizing your design, request a binding
installation drawing. Dimensions in mm.
Through drive dimensions
Flange SAE J744
Coupling for splined shaft
1)
Mounting variant
Diameter Symbol Designation
Diameter
Designation
071 090
Without
0000
82-2
A2 5/8 in 9T 16/32DP S2
A2S2
101-2
B2 7/8 in 13T 16/32DP S4
B2S4
82-2
NG A1 A2 A3 A4
A1
A2
A4
ø82.55
ø17.5
106.4
A3
O-ring
3)
M10 x 1.5; 15 deep
2)
71
300.1 9
10 19.8
90
305.6 9 10 19.8
101-2
NG A1 A2 A3
A1
A2
A3
146
ø101.6
M12 x 1.75; 21 deep
2)
O-ring
3)
71
305.1 12
9.8
90
310.6 12 9.8
Coupling for splined shaft according to ANSI B92.1a-1976, 30° pressure angle, flat root, side fit, tolerance class 51)
Thread according to DIN 13, observe the general instructions on page 24 for the maximum tightening torques.2)
O-ring included in the delivery contents3)
(to mounting flange)
(to mounting flange)
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 17/24
Overview of attachments
Through drive Attachment – 2nd pump
Flange Coupling for
splined shaft
Short code A10VG
NG (shaft)
A10VO/31
NG (shaft)
A10VO/53
NG (shaft)
External gear pump
82-2 (A)
5/8 in
A2S2
– 18 (U) 10 (U) Size F
NG4 to 22
1
)
101-2 (B)
7/8 in
B2S4
18 (S) 28 (S,R)
45 (U,W)
28 (S,R)
45 (U,W)
Size N
NG20 to 32
1)
Size G
NG38 to 45
1)
Rexroth recommends special versions of the gear pumps. Please contact us.1)
High-pressure relief valves
The two high-pressure relief valves protect the hydrostatic
transmission (pump and motor) from overload. They limit the
maximum pressure in the respective high-pressure line and
serve simultaneously as boost valves.
Standard adjustment Dp
HD
______________________ 400 bar
Please contact us regarding other pressure settings.
Setting diagram
(n = 1000
rpm
)
p
Sp
q
v1
q
v max
(n = n
max
)
p
Sp
p
max
≥10 bar
Dp drive
design
Operating pressure p
A, B
at port A, B
Safety
Boost pressure
Differential pressure Dp
HD
HD valve setting
Note
The valve settings are made at n = 1000 rpm and at
V
g max
(q
v 1
). There may be deviations in the opening pres-
sures with other operating parameters.
Circuit diagram
R
T1
X1
X2
PS BMB
AMAST2
High-pressure relief valve
18/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
The mechanical stroke limiter is an auxiliary function allowing
the maximum displacement of the pump to be steplessly
reduced, regardless of the control unit used.
The stroke of the stroke cylinder and hence the maximum
swivel angle of the pump are limited by means of two adjusting
screws.
135.4 max.
135.4 max.
28.5
86.3
Circuit diagram
b
a
R
T1
X1
X2
PS BMB
AMAST2
Mechanical stroke limiter
Ports X
3
and X
4
for stroking chamber pressure
Mechanical stroke limiter
X
3
X
4
114.5
28
114.5
86.3
Circuit diagram
X4X3
b
a
R
T1
X1
X2
PS BMB
AMAST2
Designation Port for Standard Size
1)
Maximum pres-
sure [bar]
2)
State
X
3
, X
4
Stroking chamber pressure DIN 3852 M12 x 1.5; 12 deep 40 X
Observe the general instructions on page 24 for the maximum tightening torques.
1)
Short-term pressure spikes may occur depending on the application. Keep this in mind when selecting measuring devices and 2)
fittings.
Before finalizing your design, request a binding installation drawing. Dimensions in mm.
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 19/24
Filtration boost circuit
Version S
Filtration in the suction line of the boost pump
Filter type _________________________ filter without bypass
Recommendation ____________ with contamination indicator
Flow resistance at the filter cartridge:
With ν = 30 mm
2
/s, n = n
max
_________________ Dp ≤ 0.1 bar
With ν = 1000 mm
2
/s, n = n
max
______________ Dp ≤ 0.3 bar
Pressure at port S of the boost pump
Suction pressure p
S min
(ν ≤ 30 mm
2
/s) ___ ≥ 0.8 bar absolute
At cold start short-term (t < 3 min) _______ ≥ 0.5 bar absolute
Suction pressure p
S max
__________________ ≤ 5 bar absolute
The filter is not included in the delivery contents.
Circuit diagram
R
T1
X1
X2
PS BMB
AMAST2
b
a
20/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
DEUTSCH DT04-2P-EP04, 2-pin
Molded, without bidirectional suppressor diode ____________ P
Type of protection according to DIN/EN 60529:
IP67 and IP69K
Circuit symbol
Without bidirectional suppressor diode
Mating connector
DEUTSCH DT06-2S-EP04
Rexroth Mat. No. R902601804
Consisting of: DT designation
1 case – ______________________________ DT06-2S-EP04
1 wedge – ______________________________________ W2S
2 female connectors – __________________ 0462-201-16141
The mating connector is not included in the delivery contents.
This can be supplied by Rexroth on request.
Solenoid with emergency actuation and spring return
86
ø37
36
50
(1)
(2)
Note
Manual override (emergency actuation) can be applied in the
event of a malfunction in the electrical system.
Not approved for continuous operation!
Changing connector position
If necessary, you can change the position of the connector by
turning the solenoid.
To do this, proceed as follows:
1. Loosen the fixing nut (1) of the solenoid. To do this, turn the
fixing nut (1) one turn counter-clockwise.
2. Turn the solenoid body (2) to the desired position.
3. Retighten the fixing nut. Tightening torque of the fixing nut:
5 +1 Nm (WAF 26, 12-sided DIN 3124)
On delivery, the position of the connector may differ from that
shown in the brochure or drawing.
Connector for solenoids
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 21/24
Installation situation for coupling assembly
To ensure that rotating components (coupling hub) and fixed components (case, retaining ring) do not come into contact with
each other, the installation conditions described here must be observed. This depends on the size and the splined shaft.
SAE splined shaft (spline according to ANSI B92.1a-1976)
Drive shaft V8, V9 –
The outer diameter of the coupling hub must be smaller than the inner diameter of the retaining ring d
2
in the area near the drive
shaft collar (dimension x
2
– x
3
).
Drive shaft with mounted coupling flange C8, C9 –
The depicted installation conditions are already taken into account by Rexroth.
x
2
x
1
x
3
d
4
d
3
d
2
d
1
Coupling hub
Size
Mounting flange
ød
1
ød
2 min
ød
3
ød
4
x
1
x
2
x
3
71
127-4
45 66.5 81
±0.1 127
7.0
+0.2
12.7
–0.5
8
+0.9
–0.6
90
127-4 50 66.5 81
±0.1 127 7.0
+0.2
12.7
–0.5
8
+0.9
–0.6
Before finalizing your design, request a binding
installation drawing. Dimensions in mm.
22/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
General
During commissioning and operation, the axial piston unit must be filled with hydraulic fluid and air bled. This is also to be ob-
served following a relatively long standstill as the system may empty via the hydraulic lines.
The case drain fluid in the case interior must be directed to the tank via the highest tank port (T
1
, T
2
). The minimum suction pres-
sure at port S must not fall below 0.8 bar absolute (cold start 0.5 bar absolute).
In all operational states, the suction line and tank line must flow into the tank below the minimum fluid level.
Installation position
See examples below. Additional installation positions are available upon request.
Recommended installation positions: 1 and 2.
Below-tank installation (standard)
Pump below minimum fluid level of the tank.
Above-tank installation
Pump above minimum fluid level of the tank.
Observe the maximum permissible suction height
h
S max
= 800 mm.
1 2 3 4
SB
h
t min
h
min
a
min
R
S
T
1
SB
h
t min
h
min
a
min
T
2
S
L
2
SB
h
t min
h
S max
h
min
a
min
L
1
S
R
T
1
L
2
SB
h
t min
h
S max
h
min
a
min
L
1
S
T
2
h
S max
= 800 mm, h
t min
= 200 mm, h
min
= 100 mm, SB = baffle (baffle plate)
When designing the reservoir, ensure adequate distance a
min
between the suction line and the case drain line to prevent the
heated, return flow from being drawn directly back into the suction line.
Installation
position
Air bleed Filling
Installation
position
Air bleed Filling
1 R S + T
1
3 L
2
(S) + R L
2
(S) + L
1
2
–
S + T
2
4 L
2
+ L
1
(T
2
) L
2
+ L
1
(T
2
)
Installation instructions
Before finalizing your design, request a binding
installation drawing. Dimensions in mm.
RE 92013/06.09 A4VTG Series 33
Bosch Rexroth AG 23/24
Notes
24/24 Bosch Rexroth AG
A4VTG Series 33
RE 92013/06.09
© This document, as well as the data, specifications and other information set
forth in it, are the exclusive property of Bosch Rexroth AG. It may not be repro-
duced or given to third parties without its consent.
The data specified above only serve to describe the product. No statements
concerning a certain condition or suitability for a certain application can be de-
rived 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.
Subject to change.
Bosch Rexroth AG
Hydraulics
Product Segment Axial Piston Units
Elchingen Plant
Glockeraustraße 2
89275 Elchingen, Germany
Telefon +49 (0) 73 08 82-0
Telefax +49 (0) 73 08 72 74
info.brm-ak@boschrexroth.de
www.boschrexroth.com/brm
Horb Plant
An den Kelterwiesen 14
72160 Horb, Germany
Telefone +49-74 51 92-0
Fax +49-74 51 82 21
General instructions
The A4VTG pump is designed to be used in a closed circuit. –
Project planning, assembly and commissioning of the axial piston unit require the involvement of qualified personnel. –
The service line ports and function ports are only designed to accommodate hydraulic lines. –
During and shortly after operation, there is a risk of burns on the axial piston unit and especially on the solenoids. Take appropri- –
ate safety measures (e. g. by wearing protective clothing).
Depending on the operational state of the axial piston unit (operating pressure, fluid temperature), the characteristic may shift. –
Pressure ports: –
The ports and fixing threads are designed for the specified maximum pressure. The machine or system manufacturer must
ensure that the connecting elements and lines correspond to the specified operating conditions (pressure, flow, hydraulic fluid,
temperature) with the necessary safety factors.
The data and notes contained herein must be adhered to. –
The following tightening torques apply: –
Threaded hole for axial piston unit: -
The maximum permissible tightening torques M
G max
are maximum values for the threaded holes and must not be exceeded.
For values, see the following table.
Fittings: -
Observe the manufacturer's instruction regarding the tightening torques of the used fittings.
Fixing screws: -
For fixing screws according to DIN 13, we recommend checking the tightening torque individually according to VDI 2230.
Locking screws: -
For the metal locking screws supplied with the axial piston unit, the required tightening torques of locking screws M
V
apply.
For values, see the following table.
The product is not approved as a component for the safety concept of a general machine according to DIN EN ISO 13849. –
Threaded port sizes
Maximum permissible
tightening torque of the
threaded holes M
G max
Required tightening torque
of the locking screws M
V
WAF hexagon socket for
the locking screws
M12 x 1.5 DIN 3852 50 Nm 25 Nm 6 mm
M14 x 1.5 DIN 3852 80 Nm 35 Nm 6 mm
M26 x 1.5 DIN 3852 230 Nm 120 Nm 12 mm
M42 x 2 DIN 3852 720 Nm 360 Nm 22 mm
© This document, as well as the data, specifications and other information set
forth in it, are the exclusive property of Bosch Rexroth AG. It may not be repro-
duced or given to third parties without its consent.
The data specified above only serve to describe the product. No statements
concerning a certain condition or suitability for a certain application can be de-
rived 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.
Subject to change.
Bosch Rexroth AG
Hydraulics
Axial Piston Units
Glockeraustraße 2
89275 Elchingen, Germany
Telephone +49 (0) 73 08 82-0
Fax +49 (0) 73 08 72 74
info.brm-ak@boschrexroth.de
www.boschrexroth.com/axial-piston-pumps
