Bosch Rexroth A6VM series 71 User manual

RE-A 91610/12.2015, Bosch Rexroth Corp.
Features
▶ Variable motor with axial tapered piston rotary group of
bent-axis design, for hydrostatic drives in open and
closed circuit
▶ For use in mobile and stationary applications
▶ The wide control range enables the variable motor to
satisfy the requirement for high speed and high torque.
▶ The displacement can be infinitely varied from Vgmaxto
Vgmin=0.
▶ The output speed is dependent on the flow of the pump
and the displacement of the motor.
▶ The output torque increases with the pressure differen-
tial between the high and low-pressure side and with
increasing displacement.
▶ Wide control range with hydrostatic transmissions
▶ Wide selection of control devices
▶ Cost savings through elimination of gear shifts and
possibility of using smaller pumps
▶ Compact, robust motor with long service life
▶ High power density
▶ Good starting efficiency
▶ Version with 9-piston rotary group
▶ Good low speed characteristics
▶ High uniformity
▶ Sizes 60 to 215
▶ Nominal pressure 6500psi (450bar)
▶ Maximum pressure 7250psi (500bar)
▶ Open and closed circuits
Axial piston variable motor
A6VM series 71
RE-A 91610
Edition: 12.2015
Replaces: 04.2013
Contents
Type code 2
Hydraulic fluids 5
Flow direction 6
Shaft seal 6
Operating pressure range 7
Technical data 8
HP – Proportional hydraulic control 10
EP – Proportional electric control 13
HZ – Two-point hydraulic control 15
EZ – Two-point electric control 16
HA – Automatic high-pressure related control 17
DA – Automatic speed-related control 22
Electric travel direction valve (for DA, HA.R) 24
Dimensions size 60 25
Dimensions size 85 31
Dimensions size 85 32
Dimensions size 115 38
Dimensions size 150 44
Dimensions size 170 50
Dimensions size 215 56
Connector for solenoids 62
Flushing and boost pressure valve 63
Counterbalance valve BVD and BVE 65
Speed sensor 69
Setting range for displacement 70
Installation instructions 72
Project planning notes 74
Safety instructions 75
Americas

Bosch Rexroth Corp., RE-A 91610/12.2015
2A6VM series 71 | Axial piston variable motor
Type code
Type code
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21
A6V M 0 0 / 71 A W V 0 –
Axial piston unit
01 Bent-axis design, variable, nominal pressure 6500psi (450bar), maximum pressure 7250psi (500bar) A6V
Operating mode
02 Motor M
Size (NG)
03 Geometric displacement, see technical data on page 8 in cm3/rev 060 085 115 150 170 215
in in3/rev 3.66 5.19 7.02 9.15 10.37 13.12
Control device 060 085 115 150 170 215
04 Proportional control
hydraulic
positive control ΔpSt=145psi (10bar) ● ● ● ● ● ● HP1
ΔpSt=365psi (25bar) ● ● ● ● ● ● HP2
negative control ΔpSt=145psi (10bar) ● ● ● ● ● ● HP5
ΔpSt=365psi (25bar) ● ● ● ● ● ● HP6
Proportional control
electrical
positive control U= 12 V DC ● ● ● ● ● ● EP1
U= 24 V DC ● ● ● ● ● ● EP2
negative control U= 12 V DC ● ● ● ● ● ● EP5
U= 24 V DC ● ● ● ● ● ● EP6
Two-point control
hydraulic
negative control ‒ ‒ ‒ ● ● ● HZ5
● ● ● ‒ ‒ ‒ HZ7
Two-point control
electrical
negative control U= 12 V DC ‒ ‒ ‒ ● ● ● EZ5
U= 24 V DC ‒ ‒ ‒ ● ● ● EZ6
U= 12 V DC ● ● ● ‒ ‒ ‒ EZ7
U= 24 V DC ● ● ● ‒ ‒ ‒ EZ8
Automatic control
high-pressure related,
Positive control
with minimum pressure
increase
Δp≤approx.145psi (10bar) ● ● ● ● ● ● HA1
with pressure increase Δp=1450psi (100bar) ● ● ● ● ● ● HA2
Automatic control
speed related, negative
control pSt / pHD=5/100
hydr. travel direction valve ●●●●●●DA0
electric travel direction
valve + electric Vgmax
circuit
U= 12 V DC ●●●●●●DA1
U= 24 V DC ●●●●●●DA2
Pressure control/override 060 085 115 150 170 215
05 Without pressure control/override ●●●●●●00
Pressure control fixed setting, only for HP5, HP6, EP5 and EP6 ●●●●●●D1
Override
of controls
HA1 and HA2
hydraulic remote control, proportional ●●●●●●T3
electric, two-point U= 12 V DC ●●●●●●U1
U= 24 V DC ●●●●●●U2
electric and travel
direction valve, electric
U= 12 V DC ●●●●●●R1
U= 24 V DC ●●●●●●R2
Connector for solenoids1) (see page 62)
06 Without connector (without solenoid, only for hydraulic control) 0
DEUTSCH - molded connector, 2-pin, without suppressor diode P
●= Available ○= On request ‒= Not available
1) Connectors for other electric components can deviate.

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
Type code
3
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21
A6V M 0 0 / 71 A W V 0 –
2) The settings for the setting screws can be found in the table
(seepages 70 and 71).
Additional function 1
07 Without additional function 0
Additional function 2
08 Without additional function 0
Response time damping (for selection, see control)
09 Without damping (standard with HP and EP) 0
Damping HP, EP, HP5,6D. and EP5,6D., HZ, EZ, HA with counterbalance valve BVD/BVE 1
One-sided in inlet to large stroking chamber (HA) 4
One-sided in outlet from large stroking chamber (DA) 7
Setting range for displacement
2)
10 Vg max-setting screw Vg min-setting screw 060 085 115 150 170 215
Without setting screw short (0-adjustable) ● ● ● ● ● ● A
medium ● ● ● ● ● ● B
long ● ● ● ● ● ● C
extra long ‒ ● ● ● ● ● D
Short short (0-adjustable) ● ● ● ● ● ● E
medium ● ● ● ● ● ● F
long ● ● ● ● ● ● G
extra long ‒ ● ● ● ● ● H
Medium short (0-adjustable) ● ● ● ● ● ● J
medium ● ● ● ● ● ● K
long ● ● ● ● ● ● L
extra long ‒ ● ● ● ● ● M
Series
11 Series 7, index 1 71
Configuration of ports and fastening threads
12 ANSI, port threads with O-ring sealing according to ISO 11926 A
Direction of rotation
13 Viewed on drive shaft, bidirectional W
Sealing material
14 FKM (fluoroelastomer) V
Drive shaft bearing
15 Standard bearing 0
Mounting flange 060 085 115 150 170 215
16 SAE J744 127-4 ● ● ‒ ‒ ‒ ‒ C4
127-2 ‒ ● ‒ ‒ ‒ ‒ C2
152-4 ‒ ‒ ● ● ● ‒ D4
165-4 ‒ ‒ ‒ ‒ ‒ ● E4
●= Available ○= On request ‒= Not available

Bosch Rexroth Corp., RE-A 91610/12.2015
4A6VM series 71 | Axial piston variable motor
Type code
3) Only possible in conjunction with HP, EP and HA control. Note the
restrictions described on page 65.
4) State ordering code for counterbalance valve separately in accor-
dance with data sheet 95522forBVD or 95525for BVE. Note the
restrictions described on page 65.
5) Not for EZ7, EZ8 and HZ7.
6) State ordering code for sensor separately in accordance with data
sheet 95132forDSM or 95133forDSA and note the requirements
relating to the electronics.
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21
A6V M 0 0 / 71 A W V 0 –
Drive shaft 060 085 115 150 170 215
17 Splined shaft
ANSI B92.1a
1 1/4 in 14T 12/24 DP ● ‒ ‒ ‒ ‒ ‒ S7
1 1/2 in 17T 12/24 DP ‒ ● ‒ ‒ ‒ S9
1 3/4 in 13T 8/16 DP ‒ ‒ ● ● ‒ ‒ T1
2 in 15T 8/16 DP ‒‒‒○● ● T2
Port plate for working ports 060 085 115 150 170 215
18 SAE working ports A and B at rear ● ● ● ● ● ● 1
SAE working ports A and B at side, opposite ● ● ● ● ● ● 2
Port plate with 1-stage pressure limitation
valves for mounting a counterbalance valve3)
BVD20 ● ● ● ‒ ‒ ‒ 7
BVD25, BVE25 ‒ ‒ ● ● ● ● 8
Valve (see pages 63 to 68) 060 085 115 150 170 215
19 Without valve ● ● ● ● ● ● 0
With counterbalance valve BVD/BVE mounted4) ● ● ● ● ● ● W
With flushing and boost pressure valve, mounted
Flushing on both sides
Flushing flow at:
Δp=pND‒pG=365psi (25bar) and
ν=60SUS (10 mm2/s)
(pND=low pressure, pG =case pressure)
Only possible with port plates 1 and 2
Flushing flow qv[gpm (l/min)]
0.9 (3.5) ● ● ● ‒ ‒ ‒ A
1.3 (5) ● ● ● ‒ ‒ ‒ B
2.1 (8) ● ● ● ● ● ● C
2.6 (10) ● ● ● ● ● ● D
3.7 (14) ● ● ● ‒ ‒ ‒ F
4.0 (15) ‒ ‒ ●5) ● ● ● G
4.8 (18) ‒ ‒ ●5) ● ● ● I
5.5 (21) ‒ ‒ ●5) ● ● ● J
7.1 (27) ‒ ‒ ●5) ● ● ● K
8.2 (31) ‒ ‒ ●5) ● ● ● L
9.7 (37) ‒ ‒ ‒ ● ● ● M
Speed sensor (see page 69) 060 085 115 150 170 215
20 Without speed sensor ● ● ● ● ● ● 0
Prepared for speed sensor DSM/DSA ● ● ● ● ● ● U
With speed sensor DSM/DSA mounted6) ● ● ● ● ● ● V
Standard / special version
21 Standard version 0
Standard version with installation variants, e. g. T ports against standard open and closed Y
Special version S
●= Available ○= On request ‒= Not available
Notes
▶ Note the project planning notes on page 74.
▶ When ordering, please provide the relevant technical
data additionally to the type code

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
Hydraulic fluids
5
Hydraulic fluids
The variable motor A6VM is designed for operation with
mineral oil HLP 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-resistan, water-containing hydraulic fluids
(HFAE, HFAS, HFB, HFC)
Details regarding the selection of hydraulic fluid
The hydraulic fluid should be selected such that the operat-
ing 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 240°F (115°C). The temperature difference specified
in the table 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, we recommend flushing the case at port
Uor using a flushing and boost pressure valve (see page 63).
Viscosity and temperature of hydraulic fluids
Viscosity Temperature Comment
Cold start νmax≤ 7400 SUS
(1600 mm2/s)
θSt≥ −40°F (−40°C) t≤3 min, n≤1000 rpm, without load p≤725psi (p≤50bar)
Permissible temperature difference ΔT≤ 45°F (25K) between axial piston unit and hydraulic fluid in the system
Warm-up phase ν< 7400 to 1850SUS
(1600to 400mm2/s)
θ=
−40°F to −13 °F
(−40°C to −25°C)
at p≤0.7×pnom, n≤0.5×nnom and t≤15min
Continuous
operation
ν = 1850 to 47SUS
(400 to 10mm2/s)
This corresponds, for example on the VG46, to a temperature range
of +41°F to + 185 °F (+5°C to +85 °C)(see selection diagram)
θ=
−13°Fto +217°F
(−25°Cto +103°C)
measured at port T
Note the permissible temperature range of the shaft seal
(ΔT=approx.22°F (12K) between the bearing/shaft seal and port T)
νopt= 167 to 81 SUS
(36 to 16mm2/s)
Range of optimum operating viscosity and efficiency
Short-term
operation
νmin≥ 49 SUS
(7mm2/s)
t<3min, p<0.3×pnom
▼ Selection diagram
60
200
300
100
500
1000
2000
3000
5000
7000
VG 22
VG 32
VG 46
VG 68
VG 100
80
150
(7)
(10)
(40)
(60)
(20)
(100)
(200)
(400)
(600)
(1000)
(1600)
(16)
(36)
−40 −13 120
0 20 40 60 80 160 195 240
(−40)(−25) (−10) (0) (10) (30) (50) (70) (90) (115)
50
70
Range of optimum operating viscosity ν opt
Optimum efficiency
Maximum permissible viscosity for cold start
Minimum permissible viscosity
for short-term operation
Temperature θ[°F (°C)]
Viscosity ν[SUS (mm2/s)]
Continuous operation
Warm-up phase
Minimum permissible temperature for cold start

Bosch Rexroth Corp., RE-A 91610/12.2015
6A6VM series 71 | Axial piston variable motor
Flow direction
Filtration of the hydraulic fluid
Finer filtration improves the cleanliness level of the hydrau-
lic 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 (195°F (90°C) to
maximum 217°F (103°C), measured at port T), a cleanli-
ness level of at least 19/17/14 according to ISO 4406 is
necessary.
Influence of case pressure on beginning of control
An increase in case pressure affects the beginning of con-
trol when using the following control options:
▶ HP, HA.T3: Increase
▶ DA: Decrease
With the following settings, an increase in case pressure
will have no effect on the beginning of control:
HA.R and HA.U, EP, HA
The factory setting of the beginning of control is made at
pabs = 30psi (2bar) case pressure.
Flow direction
Direction of rotation, viewed on drive shaft
clockwise (cw) counter-clockwise (ccw)
Ato B B to A
Shaft seal
Permissible pressure loading
The service life of the shaft seal will be 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) of up to 145psi (10bar) are permitted. The
service life of the shaft seal decreases with increasing
frequency of pressure spikes and increasing mean differen-
tial pressure.
The case pressure must be equal to or higher than the
ambient pressure.
0
15 (1)
30 (2)
45 (3)
60 (4)
75 (5)
2000 4000 6000 8000 10000
NG170, 215
NG85
NG60
NG115, 150
NG170
NG60
NG85
NG115NG150
NG215
Differential pressure Δp [psi (bar)]
Rotational speed n [rpm]
The FKM shaft seal may be used for leakage temperatures
from -13°Fto+240°F(-25°Cto+115°C). For application
cases below -13°F(-25°C), an NBR shaft seal is required
(permissible temperature range:
-40°Fto+195°F(-40°Cto +90°C)).

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
Operating pressure range
7
Operating pressure range
Pressure at working port A or B Definition
Nominal pressure pnom 6500 psi (450bar) The nominal pressure corresponds to the maximum design pressure.
Maximum pressure pmax 7250psi (500bar) The maximum pressure corresponds to the maximum operating pres-
sure 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)
365psi (25bar) Minimum pressure at the high-pressure side (Aor B) which is required
in order to prevent damage to the axial piston unit.
Minimum pressure – pump operating
mode (inlet)
See the diagram below To prevent damage to the axial piston motor in pump operating mode
(change of high-pressure side with unchanged direction of rotation, e. g.
when braking), a minimum pressure must be guaranteed at workingport
(inlet). This minimum pressure is dependent on the speed and displace-
ment of the axial piston unit (see characteristic curve)
Summation pressure pSu
(pressure A+ pressure B)
10150psi (700bar) The summation pressure is the sum of the pressures at both working
ports (Aand B)
Rate of pressure change RAmax Maximum permissible rate of pressure build-up and reduction during a
pressure change over the entire pressure range.
With integrated pressure-relief valve 130530psi/s (9000bar/s)
Without pressure-relief valve 232060psi/s (16000bar/s)
▼ Rate of pressure change RAmax
pnom
∆t
∆p
Time t
Pressure p
▼ Pressure definition
Single operating period
Pressure p
t1
t2tn
Minimum pressure (high-pressure side)
Maximum pressure pmax
Nominal pressure pnom
Time t
Total operating period = t1+ t2+ ... + tn
▼ Minimum pressure – pump operating mode (inlet)
Vg max
Vg x
0.3 Vg max
15 (1)
30 (2)
60 (4)
90 (6)
115 (8)
145 (10)
175 (12)
200 (14)
230 (16)
0 0.4 0.7 1.0 1.3 1.6
Inlet pressure pabs [psi (bar)]
Rotational speed n/ nnom
This diagram is valid only for the optimum viscosity range
from νopt=170to73SUS (36 to 16mm2/s).
Please contact us if these conditions cannot be satisfied.
Note
Operating pressure range valid when using hydraulic
fluids based on mineral oils. Values for other hydraulic
fluids, please contact us.

Bosch Rexroth Corp., RE-A 91610/12.2015
8A6VM series 71 | Axial piston variable motor
Technical data
Technical data
Size NG 60 85 115 160 170 215
Displacement geometric,
per revolution
Vg max in33.78 5.20 7.05 9.28 10.48 13.21
cm362.0 85.2 115.6 152.1 171.8 216.5
Vg min in3000000
cm3000000
Vg x in32.26 3.11 4.21 5.55 3.97 5.00
cm337 51 69 91 65 82
Maximum speed1)
(complying with the maximum
permissible inlet flow)
at Vg max nnom rpm 4450 3900 3550 3250 3100 2900
at Vg< Vg x (see diagram) nmax rpm 7200 6800 6150 5600 4900 4800
at Vg 0 nmax rpm 8400 8350 7350 6000 5750 5500
Inlet flow2) at nnom and Vg max qv max gpm 73 88 108 131 141 166
l/min 276 332 410 494 533 628
Torque3) at Vg max and
Δp = 6500psi (450bar)
Tlb-ft 326 448 608 800 903 1139
Nm 444 610 828 1089 1230 1550
Rotary stiffness Vg max to Vg/2 cmin lb-ft/rad 10695 16521 27511 32084 38279 51334
kNm/rad 14500 22400 37300 43500 51900 69600
Vg/2 to 0
(interpolated)
cmin lb-ft/rad 33412 49785 76559 91458 115355 144267
kNm/rad 45300 67500 103800 124000 156400 195600
Moment of inertia for rotary group JTW lb-ft20.1020 0.1709 0.2610 0.4295 0.5055 0.7190
kgm20.0043 0.0072 0.0110 0.0181 0.0213 0.0303
Maximum angular acceleration αrad/s² 21000 17500 15500 11000 11000 10000
Case volume Vgal 0.21 0.26 0.40 0.45 0.61 0.74
l 0.8 1.0 1.5 1.7 2.3 2.8
Weight, approx. mlbs 62 79 101 134 137 172
kg 28 36 46 61 62 78
▼ Permissible displacement in relation to speed
NG170
NG85,
115, 150
1.58 1.62
NG60,
215
4)
1.0
0.8
0.63
0.4
0.38
0.2
0
Vg x
Vg x
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.74
Displacement Vg / Vg max
Rotational speed n/ nnom
Notes
▶ Theoretical values, without efficiency levels and toler-
ances; values rounded
▶ Operation above the maximum values or below the mini-
mum 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 fre-
quency and the permissible angular acceleration at start
(lower than the maximum angular acceleration) can be
found in data sheet 90261.
Determining the operating characteristics
Inlet flow
qv
=Vg×n [gpm] (Vg×n )[l/min]
231 × ηv1000 × ηv
Rotational
speed
n=qv ×231 × ηv[rpm] (
qv ×1000 × ηv
)[rpm]
VgVg
Torque T=Vg×Δp ×ηmh [lb-ft] (
Vg×Δp ×ηmh
)[Nm]
24 × π20 × π
Power P=2 π ×T ×n =
qv×Δp × ηt
[HP]
(2 π ×T ×n =
qv×Δp × ηt
)[kW]
33000
1714 60000 600
Key
Vg= Displacement per revolution [in3(cm3)]
Δp = Differential pressure [psi (bar)]
n= Rotational speed [rpm]
ηv= Volumetric efficiency
ηmh = Mechanical-hydraulic efficiency
ηt=Total efficiency (ηt= ηv • ηmh)
1) The values are valid:
– For the optimum viscosity range from νopt = 170to75SUS
(36to 16mm2/s)
– with hydraulic fluid on the basis of mineral oil
2) Note inlet flow limitation due to counterbalance valve (see page65).
3) Torque without radial force, With radial force see page 9.
4) Values in this range on request

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
Technical data
9
Permissible radial and axial forces of the drive shafts
Size NG 60 85 115 150 150 170 215
Drive shaft in 1 1/4 1 1/2 1 3/4 1 3/4 2 2 2
Maximum radial force1)
at distance a
(from shaft collar)
a
FqFq max lb 1713
2802 3350 3585 3917 4355 5081
N 7620 12463 14902 15948 17424 19370 22602
ain 0.94 1.06 1.32 1.32 1.32 1.32 1.32
mm 24.0 27.0 33.5 33.5 33.5 33.5 33.5
Torque maximum at Fq max Tmax lb-ft 229 439 611 656 803 679 939
Nm 310 595 828 890 1089 1230 1445
Differential pressure maximum
at Vg max and Fq max
Δpmax psi 4550 6400 6500 5350 6500 6500 6100
bar 315 440 450 370 450 450 420
Maximum axial force,
at standstill or
pressure-free operation
+
Fax
—
+Faxmax lb0000000
N0000000
− Fax max lb 112 160 202 232 232 252 281
N 500 710 900 1030 1030 1120 1250
Permissible axial force per psi (bar)
operating pressure
+Faxperm/bar
lb/psi 0.12 0.15 0.18 0.21 0.21 0.23 0.26
N/bar 7.5 9.6 11.3 13.3 13.3 15.1 17.0
Effect of radial force 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. Examples:
Notes
▶ The values given are maximum values and do not apply
to continuous operation.
▶ The permissible axial force in –Fax direction is to be
avoided, because thereby the bearing life is reduced.
▶ Special requirements apply in the case of belt drives.
Please contact us.
▼ Toothed gear output drive
φ
o
p
t
=
4
5
°
φ
o
p
t
=
4
5
°
21
3
1 Direction of rotation "counter-clockwise", pressure at port B
2 Direction of rotation "clockwise", pressure at port A
3 Bidirectional direction of rotation
1) With intermittent operation

Bosch Rexroth Corp., RE-A 91610/12.2015
10 A6VM series 71 | Axial piston variable motor
HP – Proportional hydraulic control
HP – Proportional hydraulic control
The proportional hydraulic control provides infinite adjust-
ment of the displacement. The control is proportional to
the pilot pressure applied to port X.
HP1, HP2 positive control
▶ Beginning of control at Vg min (minimum torque, maxi-
mum permissible speed at minimum pilot pressure)
▶ End of control at Vg max (maximum torque, minimum
speed at maximum pilot pressure)
HP5, HP6 negative control
▶ Beginning of control at Vg max (maximum torque, mini-
mum speed at minimum pilot pressure)
▶ End of control at Vg min (minimum torque, maximum
permissible speed at maximum pilot pressure)
Note
▶ Maximum permissible pilot pressure: pSt=1450psi (100bar)
▶ The control oil is internally taken from the high pressure
side of the motor (Aor B). For reliable control, an oper-
ating pressure of at least 435psi (30bar) is required in
A(B). If a control operation is performed at an operat-
ing pressure <435psi (30bar), an auxiliary pressure of
at least 435psi (30bar) must be applied at port Gvia
an external check valve. For lower pressures, please
contact us.
Please note that pressures up to 7250psi (500bar) can
occur at port G.
▶ Please state the desired beginning of control in plain text
when ordering, e. g.: beginning of control at 145psi (10bar).
▶ The beginning of control and the HP characteristic curve
are influenced by the case pressure. An increase in case
pressure causes an increase in the beginning of control
(see page 6) and thus a parallel displacement of the
characteristic.
▶ A leakage flow of maximum 0.08gpm (0.3l/min) can
escape at port Xdue to internal leakage (operating pres-
sure > pilot pressure). The control is to be suitably
configured to avoid an independent build-up of pilot
pressure.
Response time damping
The response time damping is influencing the stroke char-
acteristics of the motor and thus the reaction speed of the
machine.
Standard with Size 60 to 215
HP without damping.
HP.D with throttle pin on both sides, symmetrical (as to
table)
Option with Size 60 to 215
HP with throttle pin on both sides, symmetrical (as to
table)
▼ Overview Throttle Pins
Size 60 85 115 150 170 215
Groove
size
[inch] 0.018 0.018 0.022 0.022 0.022 0.026
[mm] 0.45 0.45 0.55 0.55 0.55 0.65
HP1, HP5 pilot pressure increase ΔpSt = 145psi (10bar)
HP1 positive control
A pilot pressure increase of 145psi (10bar) at port X
results in an increase in displacement from Vg min to Vg max.
HP5 negative control
A pilot pressure increase of 145psi (10bar) at port X
results in a decrease in displacement from
Vg max to Vg min.
▶ Beginning of control, setting range 30 to 290psi (2 to
20bar)
▶ Standard setting:
Beginning of control at 45psi (3bar) (end of control at
190psi (13bar))
▼ Characteristic curve
0 0.2 0.4 0.6 0.8 1.0
Vg min Vg max
Vg/ Vg max
HP5 HP1
510 (35)
435 (30)
365 (25)
290 (20)
220 (15)
175 (12)
145 (10)
75 (5)
30 (2)
Beginning of control
setting range
Displacement
Pilot pressure pSt [psi (bar)]
Pilot
pressure
increase

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
HP – Proportional hydraulic control
11
HP2, HP6 pilot pressure increase ΔpSt = 365psi (25bar)
HP2 positive control
A pilot pressure increase of 365psi (25bar) at port X
results in an increase in displacement from Vg min to Vg max.
HP6 negative control
A pilot pressure increase of 365psi (25bar) at port X
results in a decrease in displacement from
Vg max to Vg min.
▶ Beginning of control, setting range 75 to 725psi (5 to
50bar)
▶ Standard setting:
Beginning of control at 145psi (10bar) (end of control
at 510psi (35bar))
▼ Characteristic curve
1000 (70)
870 (60)
725 (50)
580 (40)
510 (35)
435 (30)
290 (20)
145 (10)
75 (5)
0 0.2 0.4 0.6 0.8 1.0
Vg min Vg max
Vg/ Vg max
HP6 HP2HP6 HP2
Beginning of
control setting
range
Displacement
Pilot pressure pSt [psi (bar)]
Pilot
pressure
increase
▼ Circuit diagram HP1, HP2 (positive control)
B
A
M1
T2
T1
G
X
Vg min
Vg max
U
▼ Circuit diagram HP5, HP6 (negative control)
T2
T1
M1
Vg min
Vg max
B
A
U
X
G

Bosch Rexroth Corp., RE-A 91610/12.2015
12 A6VM series 71 | Axial piston variable motor
HP – Proportional hydraulic control
HP5D1, HP6D1 Pressure control, fixed setting
The pressure control overrides the HP control function.
Ifthe load torque or a reduction in motor swivel angle
causes the system pressure to reach the setpoint value of
the pressure control, the motor will swivel towards a larger
displacement.
The increase in the displacement and the resulting reduc-
tion in pressure cause the control deviation to decrease.
With the increase in displacement the motor develops more
torque, while the pressure remains constant.
Setting range of the pressure control valve 1150 to6500psi
(80 to 450bar)
▼ Circuit diagram HP5D1, HP6D1 (negative control)
T2
T1
M1
Vg min
Vg max
B
A
G
X
U

RE-A 91610/12.2015, Bosch Rexroth Corp.
13Axial piston variable motor | A6VM series 71
EP – Proportional electric control
EP – Proportional electric control
The proportional electric control provides infinite setting of
the displacement. Control is proportional to the electric
control current applied to the solenoid.
EP1, EP2 positive control
▶ Beginning of control at Vg min (minimum torque, maxi-
mum permissible speed at minimum control current)
▶ End of control at Vg max (maximum torque, minimum
speed at maximum control current)
EP5, EP6 negative control
▶ Beginning of control at Vg max (maximum torque, mini-
mum speed at minimum control current)
▶ End of control at Vg min (minimum torque, maximum
permissible speed at maximum control current)
▼ Characteristic curve
EP5, EP6 EP1, EP2
0 0.2 0.4 0.6 0.8 1.0
Vg min Vg/ Vg max Vg 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)
Note
The control oil is internally taken out of the high pressure
side of the motor (Aor B). For reliable control, an operating
pressure of at least 435psi (30bar) is necessary in A(B).
If a control operation is performed at an operating pressure
<435psi (30bar), an auxiliary pressure of at least 435psi
(30bar) must be applied at port Gusing an external check
valve. For lower pressures, please contact us.
Please note that pressures up to 7250psi (500bar) can
occur at port G.
Response time damping
The response time damping is influencing the stroke char-
acteristics of the motor and thus the reaction speed of the
machine.
Standard with Size 60 to 215
EP without damping.
EP.D with throttle pin on both sides, symmetrical (as to table)
Option with Size 60 to 115
EP with throttle pin on both sides, symmetrical (as to table)
▼ Overview Throttle Pins
Size 60 85 115 150 170 215
Groove
size
[inch] 0.018 0.018 0.022 0.022 0.022 0.026
[mm] 0.45 0.45 0.55 0.55 0.55 0.65
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 68°F (20°C)) 5.5Ω 22.7Ω
Dither frequency 100Hz 100Hz
Duty cycle 100% 100%
Type of protection: see connector version on page 62
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.

Bosch Rexroth Corp., RE-A 91610/12.2015
14 A6VM series 71 | Axial piston variable motor
EP – Proportional electric control
▼ Circuit diagram EP1, EP2 (positive control)
B
A
M1
T2
T1
G
Vg min
Vg max
U
▼ Circuit diagram EP5, EP6 (negative control)
U
T2
T1
M1
Vg min
Vg max
B
A
G
EP5D1, EP6D1 Pressure control, fixed setting
The pressure control overrides the EP control function. If
the load torque or a reduction in motor swivel angle causes
the system pressure to reach the setpoint value of the
pressure control, the motor will swivel towards a larger
displacement.
The increase in the displacement and the resulting reduc-
tion in pressure cause the control deviation to decrease.
With the increase in displacement the motor develops more
torque, while the pressure remains constant.
Setting range of the pressure control valve 1150 to 6500psi
(80 to 450bar)
▼ Circuit diagram EP5D1, EP6D1 (negative control)
U
T2
T1
Vg min
Vg max
B
A
G
M1

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
HZ – Two-point hydraulic control
15
HZ – Two-point hydraulic control
The two-point hydraulic control allows the displacement to
be set to either Vg min or Vg max by switching the pilot pres-
sure at port Xon or off.
HZ5, HZ7 negative control
▶ Position at Vg max (without pilot pressure, maximum
torque, minimum speed)
▶ Position at Vg min (with pilot pressure >145psi (10bar)
activated, minimum torque, maximum permissible
speed)
▼ Characteristic curve HZ5, HZ7
Vg min Vg max
Displacement
0
145 (10)
Pilot pressure ΔpS[psi (bar)]
1450 (100)
Note
▶ Maximum permissible pilot pressure: 1450psi (100bar)
▶ The control oil is internally taken out of the high pres-
sure side of the motor (Aor B). For reliable control, an
operating pressure of at least 435psi (30bar) is
required in A(B). If a control operation is performed at
an operating pressure < 435psi (30bar), an auxiliary
pressure of at least 435psi (30bar) must be applied at
port Gvia an external check valve. For lower pressures,
please contact us.
Please note that pressures up to 7250psi (500bar) can
occur at port G.
Response time damping
The response time damping is influencing the stroke char-
acteristics of the motor and thus the reaction speed of the
machine.
Standard with Size 150 to 215
HZ5 with throttle pin on both sides, symmetrical (as to table)
Standard with Size 60 to 115
HZ7 (Synchronizing piston) with throttle pin on both sides,
symmetrical (as to table)
▼ Overview Throttle Pins
Size 60 85 115 150 170 215
Groove
size
[inch] 0.012 0.012 0.012 0.022 0.022 0.026
[mm] 0.30 0.30 0.30 0.55 0.55 0.65
▼ Circuit diagram HZ5 (negative control) size 150 to 215
T2
T1
M1
Vg min
Vg max
B
A
X
G
U
▼ Circuit diagram HZ7 (negative control) size 60 to 115
T1 U
T2
X
G
Vg min
Vg max
B
A

Bosch Rexroth Corp., RE-A 91610/12.2015
16 A6VM series 71 | Axial piston variable motor
EZ – Two-point electric control
EZ – Two-point electric control
The two-point electric control allows the displacement to
be set to either Vg min or Vg max by switching the electric
current to a switching solenoid on or off.
Note
The control oil is internally taken out of the high pressure
side of the motor (Aor B). For reliable control, an operat-
ing pressure of at least 435psi (30bar) is required in A
(B). If a control operation is performed at an operating
pressure <435psi (30bar), an auxiliary pressure of at least
435psi (30bar) must be applied at port Gvia an external
check valve. For lower pressures, please contact us.
Please note that pressures up to 7250psi (500bar) can
occur at port G.
Response time damping
The response time damping is influencing the stroke char-
acteristics of the motor and thus the reaction speed of the
machine.
Standard with Size 150 to 215
EZ5, EZ6 with throttle pin on both sides, symmetrical (as to
table)
Option with Size 60 to 115
EZ7, EZ8 (Synchronizing piston) with throttle pin on both
sides, symmetrical (as to table)
▼ Overview Throttle Pins
Size 60 85 115 150 170 215
Groove
size
[inch] 0.012 0.012 0.012 0.022 0.022 0.026
[mm] 0.30 0.30 0.30 0.55 0.55 0.65
Sizes 150 to 215
Technical data, solenoid with DIA37 EZ5 EZ6
Voltage 12V (±20%) 24V (±20%)
Position Vg max de-energized de-energized
Position Vg min energized energized
Nominal resistance (at 68°F (20°C)) 5.5Ω 21.7Ω
Nominal power 26.2W 26.5W
Minimum required active current 1.32A 0.67A
Duty cycle 100% 100%
Type of protection: see connector version on page 62
▼ Circuit diagram EZ5, EZ6 (negative control) size 150 to 215
U
T2
T1
M1
Vg min
Vg max
B
A
G
Sizes 60 to 115
Technical data, solenoid with DIA45 EZ7 EZ8
Voltage 12V (±20%) 24V (±20%)
Position Vg max de-energized de-energized
Position Vg min energized energized
Nominal resistance (at 68°F (20°C)) 4.8Ω 19.2Ω
Nominal power 30W 30W
Minimum required active current 1.5A 0.75A
Duty cycle 100% 100%
Type of protection: see connector version on page 62
▼ Circuit diagram EZ7, EZ8 (negative control) size 60 to 115
T1 U
T2
G
B
A
Vg min
Vg max

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
HA – Automatic high-pressure related control
17
HA – Automatic high-pressure related control
The automatic high-pressure related control adjusts the
displacement automatically depending on the operating
pressure.
The displacement of the A6VM motor with HA control is
Vgmin (maximum speed and minimum torque). The control
unit internally measures the operating pressure at Aor B
(no control line required) and upon reaching the set begin-
ning of control, the controller swivels the motor from Vg min
to Vg max with increase of operating pressure. The displace-
ment is modulated between Vgmin and Vgmax, thereby
depending on load conditions.
HA1, HA2 positive control
▶ Beginning of control at Vg min (minimum torque, maxi-
mum speed)
▶ End of control at Vg max (maximum torque, minimum
speed)
Note
▶ For safety reasons, winch drives are not permissible
with beginning of control at Vg min (standard for HA).
▶ The control oil is internally taken out of the high pres-
sure side of the motor (Aor B). For reliable control, an
operating pressure of at least 435psi (30bar) is
required in A(B). If a control operation is performed at
an operating pressure < 435psi (30bar), an auxiliary
pressure of at least 435psi (30bar) must be applied at
port Gvia an external check valve. For lower pressures,
please contact us.
Please note that pressures up to 7250psi (500bar) can
occur at port G.
▶ The beginning of control and the HA.T3 characteristic
curve are influenced by case pressure. An increase in
case pressure causes an increase in the beginning of
control (see page 6) and thus a parallel shift of the
characteristic.
Response time damping
The response time damping is influencing the stroke char-
acteristics of the motor and thus the reaction speed of the
machine.
Standard with Size 60 to 215
HA1,2 with one-sided throttle pin, the throttling occurs
from Vg min to Vg max. (as to table)
▼ Overview Throttle Pins
Size 60 85 115 150 170 215
Groove
size
[inch] 0.018 0.018 0.022 0.022 0.022 0.022
[mm] 0.45 0.45 0.55 0.55 0.55 0.65
Standard with Size 60 to 215
HA1, 2 with one sided throttle pin effects the stroking time
of
the motor from Vg min to Vg max. (as to table)
▼ Overview Throttle Screw
Size 60 85 115 150 170 215
Groove
size
[inch] 0.031 0.031 0.031 0.031 0.031 0.031
[mm] 0.80 0.80 0.80 0.80 0.80 0.80

Bosch Rexroth Corp., RE-A 91610/12.2015
18 A6VM series 71 | Axial piston variable motor
HA – Automatic high-pressure related control
HA1 with minimum pressure increase, positive control
An operating pressure increase of Δp ≤approx.145psi
(10bar) results in an increase in displacement from Vg min
towards Vg max.
Beginning of control, setting range
1150 to 5100psi (80 to
350bar)
Please state the desired beginning of control in plain text
when ordering, e. g.: beginning of control at 4350psi
(300bar).
▼ Characteristic curve HA1
5800 (400)
5100 (350)
4350 (300)
3600 (250)
2900 (200)
2200 (150)
1450 (100)
1150 (80)
725 (50)
0
Vg min Vg max
Vg/ Vg max
0 0.2 0.4 0.6 0.8 1.0
Pressure increase Δp≤approx. 145psi (10bar)
Operating pressure p[psi (bar)]
Beginning of control
setting range
Displacement
▼ Circuit diagram HA1
B
A
M1
T2
T1
Vg min
Vg max
G
U
X
HA2 with pressure increase, positive control
An operating pressure increase of Δp ≤approx.1450psi
(100bar) results in an increase in displacement from Vg min
to Vg max.
Beginning of control, setting range
1150 to 5100psi (80 to
350bar)
Please state the desired beginning of control in plain text
when ordering, e. g.: beginning of control at 2900psi
(200bar)
▼ Characteristic curve HA2
6500 (450)
5800 (400)
5100 (350)
4350 (300)
3600 (250)
2900 (200)
2200 (150)
1450 (100)
1150 (80)
725 (50)
0
Vg min Vg max
Vg/ Vg max
0 0.2 0.4 0.6 0.8 1.0
Pressure increase Δp≤approx. 1450psi (100bar)
Operating pressure p[psi (bar)]
Beginning of control
setting range
Displacement
▼ Circuit diagram HA2
B
A
M1
T2
T1
G
X
Vg min
Vg max
U

RE-A 91610/12.2015, Bosch Rexroth Corp.
Axial piston variable motor | A6VM series 71
HA – Automatic high-pressure related control
19
HA.T3 hydraulic override, remote control, proportional
With the HA.T3 control, the beginning of control can be
influenced by applying a pilot pressure to port X.
For each 15psi(1bar) of pilot pressure increase, the
beginning of control is reduced by 250psi(17bar).
Beginning of control setting 4350psi
(300bar)
4350psi
(300bar)
Pilot pressure at port X0 psi 145psi
0 bar (10bar)
Beginning of control at 4350psi 1900psi
(300bar) (130bar)
Note
Maximum permissible pilot pressure 1450psi (100bar).
▼ Circuit diagram HA1.T3
B
A
M1
T2
T1
Vg min
Vg max
X
U
G
▼ Circuit diagram HA2.T3
B
A
M1
T2
T1
G
X
Vg min
Vg max
U

Bosch Rexroth Corp., RE-A 91610/12.2015
20 A6VM series 71 | Axial piston variable motor
HA – Automatic high-pressure related control
HA.U1, HA.U2 electric override, two-point
With the HA.U1 or HA.U2 control, the beginning of control
can be overridden by an electric signal to a switching sole-
noid. When the override solenoid is energized, the variable
motor swivels to maximum swivel angle, without intermedi-
ate position.
The beginning of control can be set between 1150 and
4350psi (80 and 300bar) (specify required setting in plain
text when ordering).
Technical data, solenoid with DIA45 U1 U2
Voltage 12 V (±20 %) 24 V (±20 %)
No override de-energized de-energized
Position Vg max energized energized
Nominal resistance (at 68°F (20°C)) 4.8Ω 19.2Ω
Nominal power 30 W 30 W
Minimum required active current 1.5A 0.75A
Duty cycle 100 % 100 %
Type of protection: see connector version on page 62
▼ Circuit diagram HA1U1, HA1U2
G
B
A
M1
T2
T1
Vg min
Vg max
U
▼ Circuit diagram HA2U1, HA2U2
M1
T2
T1
B
A
Vg min
Vg max
G
U