Bosch Rexroth A7VO 63 Series User manual

RE 92202/02.2015, Bosch Rexroth AG
Characteristics
▶ Variable pump with axial tapered piston rotary group of
bent-axis design, for hydrostatic drives in open circuit
▶ For use in mobile and stationary applications
▶ Flow is proportional to the drive speed and displace-
ment.
▶ The flow can be steplessly changed by adjusting the
bent axis.
▶ Wide selection of control devices
▶ Compact, robust pump with a long service life
▶ Sizes 28 to 160
▶ Nominal pressure 350bar
▶ Maximum pressure 400bar
▶ Open circuit
Axial piston variable pump
A7VO Series 63
RE 92202
Edition: 02.2015
Replaces: 05.2012
Ordering code 2
Hydraulic fluids 4
Shaft seal ring 5
Flow direction 5
Operating pressure range 6
Technical data 7
LR – Power controller without power override 9
LA1 – Power controller with hydraulically
proportional power override 13
DR – Pressure controller 15
HD – Proportional hydraulic control 18
EP – Proportional electric control 20
Dimensions, size 28 21
Dimensions, size 55 24
Dimensions, size 80 28
Dimensions, size 107 32
Dimensions, size 160 36
Connector for solenoids 40
Installation instructions 41
Project planning notes 42
Safety instructions 42
Contents

Bosch Rexroth AG, RE 92202/02.2015
2A7VO Series 63 | Axial piston variable pump
Ordering code
Ordering code
01 02 03 04 05 06 07 08 09 10 11 12 13
A7V O / 63 – V B 01
Axial piston unit
01 Bent-axis design, variable, nominal pressure 350 bar, maximum pressure 400 bar A7V
Operating mode
02 Pump, open circuit O
Size (NG)
03 Geometric displacement Vg(cm3), see “Technical data” on page 7 28 55 80 107 160
For sizes 250, 355 and 500, see data sheet 92203
Control device 28 55 80 107 160
04 Power controller without power override ●●●●● LR
with pressure cut-off ●●●●●LRD
with stroke limiter negative control Δp = 25 bar –●●●●LRH
with pressure cut-off and stroke limiter negative control Δp = 25 bar –●●●●LRDH1
with pressure cut-off and load sensing – ● ● ● ● LRDS
Power controller with hydraulically proportional power override
(only available for clockwise rotation and with port plate 02)
with load sensing – ● ● – – LA1S
with load sensing and hydraulically proportional LS-override – ● ● – – LA1S5
Pressure controller ●●●●●DR
remotely controlled ●●●●●DRG
with load sensing –●●●●DRS
Proportional control hydraulic Positive control Δp = 10 bar ●●●●●HD1
with pressure cut-off, remotely controlled Positive control Δp = 10 bar ●●●●●HD1G
Proportional control electrical Positive control U= 24 V ● ● ● ● ● EP2
Series
05 Series 6, index 3 63
Direction of rotation 28 to 160
06 Viewed on drive shaft clockwise ●R
counter-clockwise ●L
Sealing material
07 FKM (fluoroelastomer) V
Drive shaft 28 to 160
08 Splined shaft DIN 5480 ●Z
Parallel keyed shaft according to DIN 6885 ●P
Mounting flange
09 ISO 3019-2; 4-hole B
Port plate for working lines
10 SAE flange ports A and S at rear (metric fastening thread) 01
SAE flange ports A and S at side (available for power controllers LA1S and LA1S5 only, metric fastening thread) 02
● = Available –= Not available = Preferred program

RE 92202/02.2015, Bosch Rexroth AG
Axial piston variable pump | A7VO Series 63
Ordering code
3
1) Connectors for other electric components may differ
01 02 03 04 05 06 07 08 09 10 11 12 13
A7V O / 63 – V B 01
Connector for solenoids1) (see page 40)
11 Without connector (without solenoid, with hydraulic control only; without code)
DEUTSCH molded connector, 2-pin – without suppressor diode P
Standard / special version
12 Standard version (without code)
Special version -S
● = Available –= Not available = Preferred program
Notes
▶ Note the project planning notes on page42!
▶ Preservation:
– Up to 12 months as standard
– Up to 24 months long-term
(state in plain text when ordering)

Bosch Rexroth AG, RE 92202/02.2015
4A7VO Series 63 | Axial piston variable pump
Hydraulic fluids
Hydraulic fluids
The A7VO 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)
▶ 90223: Fire-resistant, water-containing hydraulic fluids
(HFC, HFB, HFAE, HFAS)
Details regarding the selection of hydraulic fluid
The hydraulic fluid should be selected such that the
operating viscosity in the operating temperature range is
within the optimum range (νopt, see selection diagram).
Note
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.
If it is not possible to maintain the conditions above due to
extreme operating parameters, we recommend flushing the
case at port U.
Viscosity and temperature of hydraulic fluids
Viscosity Temperature Comment
Cold start νmax≤1600mm2/s θSt≥-40°C t≤3min, n≤1000rpm, without load p≤50 bar
Permissible temperature difference ΔT≤25K between axial piston unit and hydraulic fluid in the system
Warm-up phase ν<1600 to 400mm2/s θ=-40°C to -25°C at p≤0.7×pnom, n≤0.5×nnom and t≤15min
Continuous operation ν=400 to 10mm2/s This corresponds, for example on the VG46, to a temperature
range of +5°C to +85 °C (see selection diagram)
θ=-25°C to +103°C measured at port R1/R2
Note the permissible temperature range of the shaft seal
(ΔT=approx.12K between the bearing/shaft seal and port R1/R2)
νopt=36 to 16mm2/s Range of optimum operating viscosity and efficiency
Short-term operation νmin≥7mm2/s t<3min, p<0.3×pnom
▼ 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
Range of optimum operating viscosity vopt
Optimum efficiency
Maximum permissible viscosity for cold start
Minimum permissible viscosity for short-term operation
Temperature θ[°C]
Viscosity v[mm2/s]
Continuous operation
Warm-up phase
Minimum permissible temperature for cold start

RE 92202/02.2015, Bosch Rexroth AG
Axial piston variable pump | A7VO Series 63
Shaft seal ring
5
Filtration of the hydraulic fluid
Finer filtration improves the cleanliness level of the hydrau-
lic fluid, which in turn 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 maxi-
mum 103°C, measured at portR1/R2) a cleanliness level is
necessary of at least 19/17/14 according to ISO 4406.
Leakage
The case interior is connected to the suction chamber. A
separate case drain line from the case to the reservoir is
therefore not required (both Rports are plugged).
Exception: For versions with pressure controller or pressure
cut-off, a drain line is needed to relieve port T1to the
reservoir.
Shaft seal ring
Permissible pressure loading
The service life of the shaft seal is influenced by the speed
of the axial piston unit and the leakage pressure in the
housing (case pressure). Momentary pressure spikes
(t<0.1s) up to 10bar are allowed. The service life of the
shaft seal decreases with increasing frequency of pressure
spikes and increasing mean differential pressure.
The case pressure must be equal to or higher than the
ambient pressure.
0
1
2
3
4
5
20000 4000 6000
Differential pressure ∆p [bar]
Rotational speed n[rpm]
NG107
NG160
NG28
NG55
NG80
The FKM shaft seal ring may be used for leakage
temperatures from -25°C to +115°C. For application cases
below -25 °C, an NBR shaft seal is required (permissible
temperature range: -40 °Cto+90°C).
Flow direction
Direction of rotation, viewed on drive shaft
clockwise counter-clockwise
Sto B S to A

Bosch Rexroth AG, RE 92202/02.2015
6A7VO Series 63 | Axial piston variable pump
Operating pressure range
Operating pressure range
Pressure at working port A or B (high-pressure side) Definition
Nominal pressure pnom 350 bar absolute The nominal pressure corresponds to the maximum design
pressure.
Maximum pressure pmax 400 bar absolute The maximum pressure corresponds the maximum operating
pressure within the single operating period. The sum of the single
operating periods must not exceed the total operating period.
Single operating period 10s
Total operating period 300 h
Minimum pressure (high-pressure side) 10 bar absolute Minimum pressure on high-pressure side (A or B) required to
prevent damage to the axial piston unit.
Rate of pressure change RAmax 16000bar/s Maximum permissible rate of pressure build-up and reduction
during a pressure change over the entire pressure range.
Pressure at suction port S (Inlet)
Minimum pressure pSmin 0.8 bar absolute
Minimum pressure at suction port S(inlet) that is required to avoid
damage to the axial piston unit. The minimum required pressure is
dependent on the speed and displacement of the axial piston unit
(see diagram on page 7).
Maximum pressure pSmax 2bar absolute
▼ Rate of pressure change RAmax
pnom
∆t
∆p
Time t
Pressure p
▼ Pressure definition
Pressure p
t1
t2tn
Single operating period
Minimum pressure (high pressure side)
Maximum pressure pmax
Nominal pressure pnom
Time t
Total operating period = t1+ t2+ ... + tn
Note
Operating pressure range valid when using hydraulic
fluids based on mineral oils. Values for other hydraulic
fluids, please contact us.

RE 92202/02.2015, Bosch Rexroth AG
Axial piston variable pump | A7VO Series 63
Technical data
7
Technical data
Size NG 28 55 80 107 160
Displacement, geometric, per revolution Vg max cm328.1 54.8 80 107 160
Maximum rotational
speed1)
At Vg max nnom rpm 3150 2500 2240 2150 1900
At Vg < 0.74 × Vg max nmax1 rpm 4250 3400 3000 2900 2560
Maximum rotational
speed2)
nmax2 rpm 4750 3750 3350 3200 2850
Flow At Vg max and nnom qvl/min 89 137 179 230 304
Power At Vg max, nnom and Δp=350bar PkW 52 80 105 134 177
Torque At Vg max and Δp = 350 bar TNm 156 305 446 596 891
Rotary stiffness Vg max to Vg /2 cmin kNm/rad 5 10 16 21 36
Vg /2 to 0 (interpolated) cmax kNm/rad 16 32 49 67 104
Moment of inertia rotary group JGR kgm² 0.0042 0.0042 0.0080 0.0127 0.0253
Maximum angular acceleration αrad/s² 35900 31600 24200 19200 15300
Case volume Vl 0.5 0.75 1.2 1.5 2.4
Weight (approx.) mkg 17 25
40 49 71
▼ Maximum permissible speed (limit speed)
0.6 0.7 0.8 0.9 1.0
2.3
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
Displacement Vg/ Vg max
Speed n/ nnom
Inlet pressure pabs
Determining operating characteristics
Flow qv=Vg×n ×ηv[l/min]
1000
Torque T= Vg×Δp [Nm]
20 × π× ηmh
Power P=2 π× T× n=qv×Δp [kW]
60000 600 × ηt
Key
Vg= Displacement per revolution [cm3]
Δp = Differential pressure [bar]
n= Rotational speed [rpm]
ηv= Volumetric efficiency
ηmh = Mechanical-hydraulic efficiency
ηt=Total efficiency (ηt= ηv× ηmh)
Notes
▶ 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 valid:
‒ At absolute pressure pabs = 1bar at suction port S
‒ For the optimal viscosity range of νopt=36 to 16 mm2/s
‒ For hydraulic fluid based on mineral oils.
2) Maximum rotational speed (speed limit) for increased inlet
pressure pabs at suction port Sand Vg< Vg max, see diagram.

Bosch Rexroth AG, RE 92202/02.2015
8A7VO Series 63 | Axial piston variable pump
Technical data
Permissible radial and axial forces of the drive shaft
Size NG 28 55 80 107 160
Drive shaft Ø mm 25 30 35 40 45
Maximum radial force1)
at distance a (from shaft
collar) a
FqFq max N 6436 7581 10266 13758 18278
a mm 14.0 17.5 20.0 22.5 25.0
Maximum torque at Fq max Tq max Nm 179 281 444 681 1019
Maximum differential pressure at Vg max and
Fqmax
Δpq max bar 400 322 349 400 400
Maximum axial force at
standstill or pressure-
free operation
–
+
Fax
+Faxmax N 0 0 0 0 0
−Faxmax N 315 500 710 900 11250
Permissible axial force per bar operating pressure +Faxperm/bar
N/bar 4.6 7.5 9.6 11.3 15.1
Effect of radialforce Fqon the service life of bearings
By selecting a suitable direction of radial force Fq, the load
on the bearings, caused by the internal rotary group forces
can be reduced, thus optimizing the service life of the
bearings. Recommended position of mating gear is depen-
dent on direction of rotation. Example:
Note
▶ The permissible axial force in direction −Fax is to be
avoided, because thereby the bearing life is reduced.
▶ Special requirements apply in the case of belt drives.
Please contact us.
▼ Gear drive
φ
o
p
t
=
4
5
°
φ
o
p
t
=
4
5
°
21
1 “Clockwise” rotation, pressure at port B
2 “Counter-clockwise” rotation, pressure at port A
1) With intermittent operation

RE 92202/02.2015, Bosch Rexroth AG
Axial piston variable pump | A7VO Series 63
LR – Power controller without power override
9
LR – Power controller without power override
The power controller regulates the displacement of the
pump depending on the operating pressure so that a given
drive power is not exceeded at constant drive speed.
The precise control with a hyperbolic control characteristic,
provides an optimum utilization of available power.
The operating pressure acts on a rocker via a measuring
spool which moves with the control. An externally adjust-
able spring force counteracts this, it determines the power
setting.
If the operating pressure exceeds the set spring force, the
control valve is actuated by the rocker and the pump swiv-
els back from the initial position Vgmax toward Vgmin. When
doing this, the lever length at the rocker shortens and the
operating pressure may rise in the same proportion as the
displacement reduces without the drive power being
exceeded (pB×Vg=constant; pB=operating pressure;
Vg=displacement).
When depressurized, the pump is swiveled to its initial
position to Vg max by a return spring.
The hydraulic output power (characteristic LR) is influ-
enced by the efficiency of the pump.
▶ Beginning of control, setting range 50 to 220bar
When ordering, state in plain text:
▶ Drive power P[kW]
▶ Drive speed n[rpm]
▶ Maximum flow qv max [l/min]
Please contact us if you need a power diagram.
▼ Characteristic curve LR
220 bar
50 bar
Vg min displacement Vg max
Operating pressure pB[bar]
▼ Schematic LR
T1
X3
B(A)
A1
M1
R2
UR1
Vg min
Vg max
S

Bosch Rexroth AG, RE 92202/02.2015
10 A7VO Series 63 | Axial piston variable pump
LR – Power controller without power override
LRD – Power controller with pressure cut-off
The pressure cut-off is a pressure control which adjusts the
displacement of the pump back to Vg min after reaching the
set pressure command value.
This function overrides the power controller, i.e. the power
control function is executed below the pressure command
value.
Pressure cut-off is preset to a pressure command value at
the factory.
▶ Setting range 200 to 350 bar
When ordering, state the setting in plain text.
Notes
▶ The pressure setting of the pressure cut-off must be at
least a factor of 5 higher than the beginning of control
of power control.
Example:
– Beginning of control of the power controller: 50bar
– Minimum setting of pressure cut-off:
5×50=250bar
Higher settings of the pressure cut-off are always
possible.
▶ For versions with pressure cut-off, a drain line is
needed from port T1to the reservoir.
When port T1is plugged and ttank≤50°C, this results
in a permissible pressure cut-off of≤2 min.
▶ 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 cut-off setting.
▼ Characteristic curve LRD
350
200 min
max
Vg min displacement Vg max
Operating pressure pB[bar]
▼ Schematic LRD
T1
X3
B(A)
A1
M1
R2
UR1
Vg min
Vg max
S

RE 92202/02.2015, Bosch Rexroth AG
Axial piston variable pump | A7VO Series 63
LR – Power controller without power override
11
LR… – Power controller with stroke limiter
Due to the hydraulic stroke limiter, it is possible to change
or limit the displacement of the pump continuously across
the entire control range. The displacement is set propor-
tionally using the pilot pressure pSt applied to port X1
(maximum of 40 bar).
The power control overrides the hydraulic stroke limiter, i.e.
below the power characteristic (hyperbolic characteristic),
the displacement is controlled in dependence on the pilot
pressure. If the set flow or operating pressure exceeds the
power control characteristic, the power control overrides
and reduces the displacement along the hyperbolic charac-
teristic.
A control pressure of 40bar is needed to swivel the pump
from its initial position Vgmax to Vgmin.
The necessary control power is taken from the operating
pressure or the external control pressure applied to port Y3.
To ensure that the stroke limiter functions at a low operat-
ing pressure of <40bar, port Y3must be supplied with an
external control pressure of about 40bar.
LRH1 – Hydraulic stroke limiter (negative control)
▶ Control from Vgmax to Vgmin
As the pilot pressure increases, the pump swivels to a
smaller displacement.
▶ Start of control (at Vgmax) can be set to 4to15bar
When ordering, state the start of control in plain text.
▶ Initial position without pilot signal (pilot pressure): Vgmax
▼ Characteristic curve LRH1
control pressure increase (Vgmax–Vgmin) Δp=25bar
40
35
30
25
20
15
10
5
4
0 0.6 0.8 1.00.40.2
Displacement Vg/Vg max
Pilot pressure pSt [bar]
▼ Schematic LRH1
T1
X3
X1
Y3
B(A)
A1
M1
R2
UR1
Vg min
Vg max
S
▼ Schematic LRDH1
T1
X3
X1
Y3
B(A)
A1
M1
R2
UR1
Vg min
Vg max
S

Bosch Rexroth AG, RE 92202/02.2015
12 A7VO Series 63 | Axial piston variable pump
LR – Power controller without power override
LRDS – Power control with pressure cut-off and load
sensing
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 section of the
external measuring orifice (1), which is located between
the pump and the consumer. Below the power curve and
the setting of the pressure cut-off and within the control
range of the pump, the flow is independent of the load
pressure.
The measuring orifice is usually a separately located load
sensing directional valve (control block). The position of
the directional valve spool determines the opening cross-
section of the measuring orifice and thus the flow of the
pump.
The load sensing controller compares pressure before and
after the orifice and keeps the pressure drop (differential
pressure Δp) across the orifice – and therefore the
flow – constant.
If the differential pressure ∆p at the measuring orifice rises,
the pump is swiveled back (toward Vg min). If the differential
pressure Δp drops, the pump is swiveled out (toward
Vgmax) until equilibrium at the measuring orifice is restored.
Δpmeasuring orifice=ppump–pconsumer
▶ Setting range for Δp 14to25bar
▶ Default setting 18bar
When ordering, state the setting in plain text.
The stand-by pressure in zero-stroke mode (metering orifice
closed) is slightly higher than the Δp setting.
In an LUDV system, the pressure cut-off is integrated in the
flow sharing control block (LUDV).
▼ Characteristic curve LRDS
350
200 min
max
Vg min displacement Vg max
Operating pressure pB[bar]
▼ Schematic LRDS
T1
X3
X4
B(A)
1
A1
M1
R2
UR1
Vg min
Vg max
S
The measuring orifice (control block) (1) is not included in
the scope of delivery.

RE 92202/02.2015, Bosch Rexroth AG
Axial piston variable pump | A7VO Series 63
LA1 – Power controller with hydraulically proportional power override
13
LA1 – Power controller with hydraulically proportional power override
The power controller regulates the displacement of the
pump depending on the operating pressure so that a given
drive power is not exceeded at constant drive speed.
The hyperbolic power curve is approximated with two
measuring springs. The operating pressure acts on the mea-
surement area of a differential piston against the measuring
springs and an externally adjustable spring force which
determines the power setting.
If the sum of the hydraulic forces exceeds the forces of the
springs, the control oil is fed to the stroking piston, which
swivels the pump back to reduce the flow.
In a depressurized state, the pump is swiveled to its initial
position to Vg max by a return spring.
By connecting an external pilot pressure at port X3, it is
possible to override the power control proportionally.
Increasing pilot pressure=reduced power.
▼ Characteristic curve LA1
Operating pressure pA[bar]
Setting range
Beginning of control
400
350
300
250
200
150
100
50
00 0.2 0.4 0.6 0.8 1.0
Vg min displacement Vg max
The hydraulic output power (characteristic curve) is
affected by the efficiency.
When ordering, state in plain text:
▶ Drive power P[kW]
▶ Drive speed n[rpm]
▶ Maximum volume flow qV max [l/min]
Please contact us if you need a power diagram.
LA1S – Power controller with load sensing
For description of load sensing, see page12.
▼ Characteristic curve LA1S
350
200 min
max
Vg min displacement Vg max
Operating pressure pB[bar]
▼ Schematic LA1S
X3
X4
A
R2
UR1
Vg min
Vg max
S

Bosch Rexroth AG, RE 92202/02.2015
14 A7VO Series 63 | Axial piston variable pump
LA1 – Power controller with hydraulically proportional power override
LA1S5 – Power controller with load sensing and
hydraulically proportional LS-override
By connecting an external pilot pressure at port X6, it is
possible to override proportionally the differential
pressure Δp of the load sensing control.
Increasing pilot pressure = lower Δp setting.
An example of this is shown in the characteristic curve
below.
Please consult us before carrying out project planning.
▼ Characteristic curve LA1S5
25
18
14
10
5
0 5 10 15 20 25 30
Pilot pressure pX6 [bar]
Differential pressure
∆pLS [bar]
▼ Schematic LA1S5
X3
X6
X4
A
R2
UR1
Vg min
Vg max
S

RE 92202/02.2015, Bosch Rexroth AG
Axial piston variable pump | A7VO Series 63
DR – Pressure controller
15
DR – Pressure controller
The pressure control limits the maximum pressure at the
pump outlet within the control range of the variable pump.
The variable pump only delivers as much hydraulic fluid as
is required by the consumers. If the operating pressure
exceeds the setpoint value set at the integrated pressure
valve, the pump control will shift toward a smaller
displacement and the control deviation will decrease.
When depressurized, the pump is swiveled to its initial
position Vgmax by an adjustment spring.
▶ Setting range of pressure control 50to350bar
When ordering, state the setting in plain text.
Notes
▶ For versions with controller DR, a drain line is needed
from port T1to the reservoir.
▶ Any pressure-relief valve included in the system to limit
the maximum pressure must be set to a cracking pres-
sure at least 20bar above the controller setting.
▼ Characteristic curve DR
50
350 max
max. 10 bar
min
qV min flow qV[l/min] qV max
Operating pressure pB[bar]
▼ Schematic DR
M1
R2
U R1
T1
X3
B(A)
A1
S
Vg min
Vg max
Zero-stroke operation
The standard pump unit is designed for intermittent con-
stant pressure operation. Short-term zero-stroke operation
(< 1min.) is permissible up to an operating pressure
pmax=315bar at a reservoir temperature of ≤50°C.
In the case of longer zero-stroke operation (> 1 min),
bearing flushing should be carried out via flushing port U.
UR1
S
T1
R2
Flow port
Flushing flow (recommended)
NG 28 55 80 107 160
qV flush l/min 3 4 6 8 12
Temperature of flushing fluid ≤ reservoir temperature

Bosch Rexroth AG, RE 92202/02.2015
16 A7VO Series 63 | Axial piston variable pump
DR – Pressure controller
DRG – Pressure controller, remotely controlled
A separate sequence valve with port plate provides the
pressure control function. The valve is arranged separate
from the pump; in this connection, you should not exceed
the single line length of 5m. The valve is supplied with high
pressure from port A1of the pump. The system feeds back
via port X3the control power of the valve into the pump;
the valve adjusts the pump back to Vgmin. Note that ports T
of the sequence valve and T1of the pump are returned to
the reservoir (cooler).
▶ Setting range of pressure control 50to315bar
When ordering, state the setting in plain text.
Notes
▶ For versions with controller DRG, a drain line is
needed from port T1to the reservoir.
▶ Any pressure-relief valve included in the system to limit
the max. pressure must be set to a cracking pressure
at least 20bar above the controller setting.
You must order the sequence valve and the port plate
separately.
▶ Sequence valve (1): DZ5DP2-1X/315YMSO21
(Material number R900495604)
▶ Port plate (2): G 115/1
(Material number R900424379)
▼ Characteristic curve DRG
50
315 max
max. 10 bar
min
qV min flow qV[l/min] qV max
Operating pressure pB[bar]
▼ Schematic DRG
R2
UR1
Vg min
Vg max
T1
X3
A
A1
M1
S
P A T
1
2

RE 92202/02.2015, Bosch Rexroth AG
Axial piston variable pump | A7VO Series 63
DR – Pressure controller
17
DRS – Pressure controller with load sensing
For description of load sensing, see page12.
Notes
▶ For versions with controller DRS, a drain line is
needed from port T1to the reservoir.
▶ The pressure controller overrides the load-sensing
controller, i.e. the load-sensing function operates
below the set pressure.
▼ Characteristic curve DRS
50
350 max
max. 10 bar
min
qV min flow qV[l/min] qV max
Operating pressure pB[bar]
▼ Schematic DRS
R2
UR1
Vg min
Vg max
T1
X3
A
A1
M1
S
X4
1
The measuring orifice (control block) (1) is not included in
the scope of delivery.

Bosch Rexroth AG, RE 92202/02.2015
18 A7VO Series 63 | Axial piston variable pump
HD – Proportional hydraulic control
HD – Proportional hydraulic control
The proportional hydraulic control provides continuous
control of the displacement. Control is carried out propor-
tional to the pilot pressure applied at port X1.
▶ Maximum permissible pilot pressure pSt=40bar
▶ Control from Vgmin to Vgmax (positive control)
As the pilot pressure increases, the pump swivels to a
larger displacement.
▶ Start of control (at Vgmin) can be set to 4to15bar
When ordering, state the start of control in plain text.
A control pressure of 40bar is needed to swivel the pump
from its initial position Vgmin to Vgmax.
The necessary control power is taken from the operating
pressure or the external control pressure applied to port Y3.
To ensure that control is guaranteed at a low operating
pressure of <40bar too, port Y3must be supplied with an
external control pressure of about 40bar.
▼ Characteristic curve HD1 positive control
increase in control pressure (Vgmin–Vgmax) Δp=10bar
40
35
30
25
20
15
10
5
4
0 0.6 0.8 1.00.40.2
Displacement Vg/Vg max
Pilot pressure pSt [bar]
▼ Schematic HD
R2
UR1
Vg min
Vg max
T1
X3
X1
Y3
B(A)
A1
M1
S

RE 92202/02.2015, Bosch Rexroth AG
Axial piston variable pump | A7VO Series 63
HD – Proportional hydraulic control
19
HD1G – Proportional hydraulic control with pressure
cut-off, remotely controlled
A separate sequence valve with port plate provides the
pressure cut-off function. The valve is arranged separate
from the pump; in this connection, you should not exceed
the single line length of 5m. The valve is supplied with high
pressure from port A1of the pump. The system feeds back
via port X3the control power of the pump into the valve
and at port Aof the sequence valve's port plate diverts it
into the reservoir; if the set pressure command value is
exceeded, this adjusts the pump back to Vgmin.
▶ Pressure cut-off setting range 50 to 315 bar
When ordering, state the pressure cut-off setting in plain
text.
Notes
▶ Port Afrom the sequence valve must be returned to
the reservoir (cooler).
▶ Any pressure-relief valve included in the system to limit
the max. pressure must be set to a cracking pressure
at least 20bar above the controller setting.
You must order the sequence valve and the port plate
separately.
▶ Sequence valve (1): DZ5DP2-1X/315XYMSO20
(Material number R900490554)
▶ Port plate (2): G 115/1
(Material number R900424379)
▼ Characteristic curve HD1G positive control
50
315 max
max. 10 bar
min
qV min flow qV[l/min] qV max
Operating pressure pB[bar]
▼ Schematic HD1G
R2
UR1
Vg min
Vg max
T1
X3
X1
Y3
B(A)
A1
M1
S
P T A B(X)
1
2

Bosch Rexroth AG, RE 92202/02.2015
20 A7VO Series 63 | Axial piston variable pump
EP – Proportional electric control
EP – Proportional electric control
The proportional electric control, type EP, provides continu-
ous control of the displacement. Control is proportional to
the electric control current applied to the solenoid.
▶ Control from Vgmin to Vgmax (positive control)
As the pilot pressure increases, the pump swivels to a
larger displacement.
A control pressure of 40bar is needed to swivel the pump
from its initial position Vgmin to Vgmax.
The necessary control power is taken from the operating
pressure or the external control pressure applied to port Y3.
To ensure that control is guaranteed at a low operating
pressure of <40bar too, port Y3must be supplied with an
external control pressure of about 40bar.
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.com/mobile-electronics.
Technical data, solenoid EP2
Voltage 24V (±20%)
Control current
Start of control 200mA
End of control 600mA
Current limit 0.77A
Nominal resistance (at 20°C) 22.7Ω
Dither frequency 100Hz
Duty cycle 100%
Type of protection: see connector version page 40
▼ Characteristic curve EP2 positive control
0 0.6 0.8 1.00.40.2
800
700
600
500
400
300
200
100
Displacement Vg / Vg max
Control current I[mA]
▼ Schematic EP2
R2
UR1
Vg min
Vg max
T1
X3
Y3
B(A)
A1
M1
S