RE 91650/2023-11-28

Replaces: 2021-09-03

Axial piston variable motor

A36VM series 10

f High-pressure motor for travel drives

f Sizes 125 and 255
f Nominal pressure 450 bar
f Maximum pressure 530 bar
f Closed circuit

Features Contents
▶ Robust motor with long service life Type code 2
▶ Approved for high rotational speeds Hydraulic fluid 4
▶ High starting efficiency Working pressure range 6
▶ Excellent slow-running characteristics Technical data 8
▶ Very wide control range for high travel speeds EP – Proportional control, electric 10
▶ High torque Dimensions size 125 12
▶ With integrated flushing and boost-pressure valve Dimensions size 255 14
▶ Bent-axis design Connector for solenoids 16
Flushing and boost-pressure valve 17
Speed sensor 18
Setting range for displacement 19
Installation instructions 20
Project planning notes 22
Safety instructions 23
Related documentation 24

 RE 91650/2023-11-28, Bosch Rexroth AG

2 A36VM series 10 | 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
A36V M 00 P 0 0 / 10 M W V 0 – 0

Axial piston unit

01 Bent-axis design, variable A36V

Operating mode 125 255

02 Motor ● ● M

Size (NG)
03 Geometric displacement, see page 8 125 255

Control device 125 255

04 Proportional control positive control U = 12 V ● ● EP1
electric U = 24 V ● ● EP2
negative control U = 12 V ● ● EP5
U = 24 V ● ● EP6

Override 125 255

05 Without ● ● 00

Connector for solenoids1) 125 255

06 DEUTSCH - molded connector, 2-pin, without suppressor diode ● ● P

Additional function 125 255

07 Without ● ● 0

Stroking time damping (for selection, see control) 125 255

08 Without damping (standard for EP1, EP2) ● ● 0
With damping both sides ● ● 1
one-sided in outlet from large stroking chamber (standard for EP5, EP6) ● ● 7

Setting ranges for displacement2)

09 Vg max setting screw Vg min setting screw 125 255
Without without (standard for EP) ● ● 0
short ○ – A

Series 125 255

10 Series 1, index 0 ● ● 10

Version of port and fastening threads 125 255

11 Metric ports based on ISO 6149 with O-ring seal,
● ● M
metric fastening thread according to DIN 13

Direction of rotation 125 255

12 Viewed on drive shaft, bi-directional ● ● W

Sealing material 125 255

13 FKM (fluorocarbon rubber)) ● ● V

Additional function 125 255

14 Without ● ● 0

● = Available ○ = On request
1) Connectors for other electric components may deviate.
2) The adjustment values for the setting screws can be found in
the table on page 19. = Preferred program

Bosch Rexroth AG, RE 91650/2023-11-28

 Axial piston variable motor | A36VM series 10 3
 Type code

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21
A36V M 00 P 0 0 / 10 M W V 0 – 0

Mounting flange 125 255

15 ISO 3019-2 metric 140-4 ● – N4
180-4 – ● R4

Drive shaft 125 255

16 Splined shaft DIN 5480 W40×2×18×9g ● – Z9
W50×2×24×9g – ● A2

Working port (port plate) 125 255

17 SAE working port A and B at rear ● ● 1
SAE working port A and B at side, opposite ● ● 2

Valves 125 255

18 Without ○ ○ 0
With flushing and boost-pressure valve, integrated, Flushing flow qv [l/min] 3.5 ● – A
flushing on both sides 5 ● – B
Flushing flow at:
8 ● ● C
Δp = pND ‒ pG = 25 bar and ν = 10 mm2/s
(pND = low pressure, pG = case pressure) 10 ● ● D
Possible with port plates 1 and 2 12 ● ● E
14 ● – F
15 – ● G
16 ● – H
18 – ● I
20 ● – N
21 – ● J
27 – ● K
35 – ● O
50 – ● Q

Other ports 125 255

19 Without U port (without bearing flushing port) ● ● 1
With U port (with bearing flushing port) ○ ○ 2

Sensors 125 255

20 Without ● ● 0
Prepared for sensor DSA/20 and DST ● ● W
Speed sensor DSA/20 mounted3) ● ● C
Speed sensor DST mounted3) ● ● E

Standard/special version
21 Standard version 0

Notice ● = Available ○ = On request – = Not available

▶ Note the project planning notes on page 22.
= Preferred program
▶ In addition to the type code, please specify the
relevant technical data when placing your order.
▶ Please note that not all type code combinations are
available although the individual functions are marked 3) Specify the type code separately for sensor in accordance with
as being available. data sheet 95126 (DSA/20) or 95131 (DST/10) and observe the
requirements for the electronics.

 RE 91650/2023-11-28, Bosch Rexroth AG

4 A36VM series 10 | Axial piston variable motor
Hydraulic fluid

Hydraulic fluid

The axial piston unit is designed for operation with HLP Hydraulic fluids with positive evaluation in the Fluid
mineral oil according to DIN 51524. Rating are listed in the following data sheet:
Application instructions and requirements for hydraulic fluid ▶ 90245: Bosch Rexroth Fluid Rating List for Rexroth
selection, behavior during operation as well as disposal and hydraulic components (pumps and motors)
environmental protection should be taken from the following
data sheets before the start of project planning: The hydraulic fluid should be selected so that the
▶ 90220: Hydraulic fluids based on mineral oils and operating viscosity in the operating temperature range is
related hydrocarbons within the optimum range (νopt; see selection diagram).

Selection of hydraulic fluid Notice

Bosch Rexroth evaluates hydraulic fluids on the basis of the The axial piston unit is not suitable for operation with HF
Fluid Rating according to the technical data sheet 90235. and environmentally acceptable hydraulic fluids.

Viscosity and temperature of hydraulic fluids

Viscosity Shaft seal Temperature3) Comment
Cold start νmax ≤ 1600 mm²/s NBR 2)
θSt ≥ -40 °C t ≤ 3 min, without load (p ≤ 50 bar), n ≤ 1000 rpm
FKM θSt ≥ -25 °C Permissible temperature difference between axial piston unit
and hydraulic fluid in the system maximum 25 K
Warm-up phase ν = 1600 … 400 mm²/s t ≤ 15 min, p ≤ 0.7 × pnom und n ≤ 0.5 × nnom
Permissible ν = 400 … 10 mm²/s1) NBR2) θ ≤ +78 °C Measured at port T
operating range FKM θ ≤ +103 °C

νopt = 36 … 16 mm²/s Optimal operating viscosity and efficiency range

Short-term ope- νmin = 10 … 7 mm²/s NBR2) θ ≤ +78 °C t ≤ 3 min, p ≤ 0.3 × pnom, measured at port T
ration FKM θ ≤ +103 °C

Notice
The maximum circuit temperature of +115°C must not be exceeded at the working ports A and B complying with the
permissible viscosity.

▼ Selection diagram

Maximum permissible viscosity on cold start

1600
Warm-up phase 1000
600
400
200
VG 68
VG 46
VG

VG 32
VG 22
Viscosity ν [mm2/s]

10

100
0

Permissible operating range

60
40
36
νopt
20
16

10
Minimum permissible viscosity for short-term operation
7
−40 −25 −10 0 10 30 40 50 70 90 115
Temperature ϑ [°C]

1) This corresponds, for example on the VG 46, to a temperature 2) Special version, please contact us
range of +4 °C to +85 °C (see selection diagram). 3) If the temperature at extreme operating parameters cannot
be adhered to, please contact us.
Bosch Rexroth AG, RE 91650/2023-11-28
 Axial piston variable motor | A36VM series 10 5
 Hydraulic fluid

Filtration of the hydraulic fluid Flow direction

Finer filtration improves the cleanliness level of the hyd-
raulic fluid, which increases the service life of the Direction of rotation, viewed on drive shaft
axial piston unit. Clockwise Counter-clockwise
A cleanliness level of at least 20/18/15 is to be maintained A to B B to A
according to ISO 4406.
At a hydraulic fluid viscosity of less than 10 mm²/s
(e.g. due to high temperatures during short-term
operation), a cleanliness level of at least 19/17/14
according to ISO 4406 is required.
Examples of temperatures of hydraulic fluids at a viscosity
of 10 mm²/s:
▶ 73 °C at HLP 32
▶ 85 °C at HLP 46

 RE 91650/2023-11-28, Bosch Rexroth AG

6 A36VM series 10 | Axial piston variable motor
Working pressure range

Working pressure range

Pressure at working port A or B Definition

Nominal pressure pnom 450 bar The nominal pressure corresponds to the maximum design pressure.
Maximum pressure pmax 500 bar The maximum pressure corresponds to the maximum working pressure
Single operating period max. 10 s within a single operating period. The sum of single operating periods must
not exceed the total operating period.
Total operating period 300 h
Within the total operating period of 300 h, a maximum pressure of 500 bar
Maximum pressure pmax 530 bar to 530 bar is permissible for a limited period of 50 h.
Total operating period 50 h
Minimum pressure (high-pressure side) 25 bar Minimum pressure at the high-pressure side (A or B) which is required to
prevent damage to the axial piston unit.
Minimum pressure – operation as see diagram on To prevent damage to the axial piston motor during operation as a pump
a pump (inlet) page 7 (change of the high-pressure side with constant direction of rotation,
e.g. during brake applications) a minimum pressure has to be ensured at the
working port (inlet). The minimum pressure is dependent on the rotational
speed and displacement of the axial piston unit (see the characteristic curve).
Summation pressure pSu 700 bar The summation pressure is the sum of the pressures at the ports for the
(pressure A + pressure B) working lines (A and B).

Rate of pressure change RA max Maximum permissible speed of pressure build-up and reduction during
with integrated pressure relief valve 9000 bar/s a pressure change across the entire pressure range.

without pressure relief valve 16000 bar/s

Case pressure at port T
Continuous differential pressure ∆pT cont 2 bar Maximum, averaged differential pressure at the shaft seal
(case pressure to ambient pressure)
Pressure peaks pT peak 10 bar t < 0.1 s

Bosch Rexroth AG, RE 91650/2023-11-28

  Axial piston variable motor | A36VM series 10 7
 Working pressure range

▼ Rate of pressure change RA max ▼ Pressure definition

pnom t2
Single operating period t1 tn
∆t Maximum pressure pmax
Nominal pressure pnom
Pressure p

Pressure p
∆p

Time t
Minimum pressure (high-pressure side)
▼ Minimum pressure – operation as a pump (inlet)
Time t
18
Differential pressure Δp [bar]

Vg x Total operating period = t1 + t2 + ... + tn

16
14 Vg max
12 Notice
10 ▶ Working pressure range applies when using
8 0.3 Vg max hydraulic fluids based on mineral oils. Please contact
6
us for values for other hydraulic fluids.
4
3 ▶ In addition to the hydraulic fluid and the temperature,
0 0.5 1.0 1.5 2.0 the service life of the shaft seal is influenced by the
Rotational speed n [rpm]
rotational speed of the axial piston unit and the case
pressure.
Effect of case pressure on beginning of control ▶ The service life of the shaft seal decreases with incre-
With the EP control options, an increase in case pressure asing frequency of pressure peaks and increasing
will have no effect on the beginning of control. mean differential pressure.
▶ The case pressure must be greater than the external
pressure (ambient pressure) at the shaft seal.

 RE 91650/2023-11-28, Bosch Rexroth AG

8 A36VM series 10 | Axial piston variable motor
Technical data

Technical data

Size NG 125 255

Geometric displacement, per revolution1) Vg max cm3 126.4 253.2
Vg min cm 3
17.8 37.5
Vg x cm3 72.0 144
Maximum rotational at Vg max nnom rpm 2560 2050
speed2) (complying with at Vg < Vg x (see diagram on page 8) nmax 1 rpm 4500 3600
the maximum permissible
at Vg < 0.3 Vg max nmax 2 rpm 5000 4000
inlet flow and pressure)
intermittent at Vg < 0.3 Vg max
3)
nmax 3 rpm please contact us
Inlet flow at nnom and Vg max qv max l/min 324 520
Torque4 at Vg max and Δp = 450 bar M Nm 905 1813
Rotary stiffness cmin kNm/rad 9 27
Moment of inertia of the rotary group JTW kgm2 0.010 0.033
Case volume V l 1.45 2.5
Weight approx. m kg 43.6 80

Speed range Permissible displacement depending on the rotational

The minimum rotational speed nmin is not limited. speed
For applications with requirements on the evenness of the 1.0
rotation at low rotational speeds, please contact us.
Displacement Vg / Vg max

0.8
NG125
NG255
0.6 Vg x
0.57
Notice
▶ Theoretical values, without efficiency and tolerances; 0.4

values rounded
0.2 5)
▶ Operation above the maximum values or below 0.14
the minimum values may result in a loss of function, 0
0.4 0.6 0.8 1.0 1.2 1.4 1.75 1.95
a reduced service life or in the destruction of the
Rotational speed n / nnom
axial piston unit. Other permissible limit values, such as
speed variation, reduced angular acceleration as
a function of the frequency and the permissible angular Determination of the operating characteristics
acceleration at start (lower than the maximum angular Vg × n
acceleration) can be found in data sheet 90261. Inlet flow qv = [l/min]
1000 × ηv
Rotational qv × 1000 × ηv
n = [rpm]
speed Vg
Vg × Δp × ηhm
Torque M = [Nm]
20 × π
2π×M×n qv × Δp × ηt
Power P = = [kW]
60000 600

Key
Vg Displacement per revolution [cm3]
1) The minimum displacement is infinitely adjustable, see type code
Δp Differential pressure [bar]
on page 2.
2) The values are applicable: n Rotational speed [rpm]
– for the optimum viscosity range from νopt = 36 to 16 mm2/s ηv Volumetric efficiency
– with hydraulic fluid based on mineral oils ηhm Hydraulic-mechanical efficiency
3) Intermittent maximum speed: short-term overspeed, ηt Total efficiency (ηt = ηv × ηhm)
t < 30 s and Δp < 200 bar
4) Torque without radial force, with radial force see page 9.
5) Values in this range on request

Bosch Rexroth AG, RE 91650/2023-11-28

 Axial piston variable motor | A36VM series 10 9
 Technical data

Permissible radial and axial loading on the drive shafts

Size NG 125 255
Drive shaft Code Z9 A2
with splined shaft ⌀ mm W40 W50
Maximum radial Fq Fq max N 18081 29355
force at distance a a mm 22.5 27.5
(from shaft collar)
a
Maximum torque at Fq max Mq max Nm 895 1820
Maximum differential pressure at Vgmax and Fq max Δpq max bar 450 450
Maximum axial force + Fax max N 0 0
at standstill or depressurized Fax +
– − Fax max N 710 1120
operation
Permissible axial force per bar working pressure + Fax perm/bar N/bar 9.6 15.1

Effect of radial force Fq on bearing service life

By selecting a suitable direction of radial force Fq, the load Notice
on the bearings, caused by the internal rotary group forces ▶ The values given are maximum values and do not
can be reduced, thus optimizing the bearing service life. apply to continuous operation.
Recommended position of mating gear is dependent on ▶ The permissible axial force in direction −Fax is to be
the direction of rotation. Examples: avoided as the bearing service life is reduced.
▼ Gear output drive ▶ Special requirements apply in the case of belt output
drives. Please contact us.
° φopt
= 45 =4
t
φ op 5°
3

1 2

1 „Counter-clockwise“ rotation, pressure at port B

2 „Clockwise“ rotation, pressure at port A
3 „Bi-directional“ direction of rotation

 RE 91650/2023-11-28, Bosch Rexroth AG

10 A36VM series 10 | Axial piston variable motor
EP – Proportional control, electric

EP – Proportional control, electric

The electric control with proportional solenoid provides Stroking time damping
infinite adjustment of the displacement. Control is The stroking time damping impacts the swivel behavior of
proportional to the electric control current applied to the motor and consequently the machine response speed.
the solenoid. Standard
EP1, EP2 positive control EP without damping.
▶ Beginning of control at Vg min (minimum torque, Option
maximum permissible rotational speed at minimum EP with throttle pin on both sides, symmetrical (see table)
control current)
▶ End of control at Vg max (maximum torque, ▼ Throttle pin overview

minimum rotational speed at maximum control current) Size 125 255

EP5, EP6 negative control Groove size [mm] 0.55 0.65
▶ Beginning of control at Vg max (maximum torque,
minimum rotational speed at minimum control current)
▶ End of control at Vg min (minimum torque, Technical data, solenoid EP1, EP5 EP2, EP6
maximum permissible rotational speed at maximum Voltage 12 V (±20%) 24 V (±20%)
control current) Control current
Start of control 400 mA 200 mA
▼ Characteristic curve End of control 1200 mA 600 mA

EP5, EP6 EP1, EP2 Current limit 1.54 A 0.77 A

1600 800
max max Nominal resistance (at 20 °C) 5.5 Ω 22.7 Ω
Dither
1400 700
Frequency 100 Hz 100 Hz
1200 600 Minimum oscillation range 1)
240 mA 120 mA
Control current I [mA]

1000 500 Duty cycle 100% 100%

Type of protection: see connector version page 16
800 400
Various BODAS controllers with application software and
600 300 amplifiers are available for controlling the proportional
solenoids.
400 200
Further information can also be found on the Internet at
200 100 www.boschrexroth.com/mobile-electronics.

0 0.2 0.4 0.6 0.8 1.0 EP5 EP6

Vg min Vg / Vg max Vg max EP1 EP2
(12 V) (24 V)
Displacement

Please note
▶ The control oil is internally taken out of the
high-pressure passage of the motor (A or B).
For reliable control, a working pressure of at least
30 bar is required in A (B).

1) Minimum required oscillation range of the control current ΔIp-p

(peak to peak) within the respective control range
(start of control to end of control)

Bosch Rexroth AG, RE 91650/2023-11-28

 Axial piston variable motor | A36VM series 10 11
 EP – Proportional control, electric

▼ Circuit diagram EP1, EP2 (positive control)

M1

T1

Vg min

Vg max

T2

▼ Circuit diagram EP5, EP6 (negative control)

T1

Vg min

Vg max
A

T2

M1

 RE 91650/2023-11-28, Bosch Rexroth AG

12 A36VM series 10 | Axial piston variable motor Dimensions [mm]
Dimensions size 125

Dimensions size 125

EP1, EP2 – Proportional electric control, positive control

Port plate 1 — SAE working ports A and B at rearn

302
135 2) 165
32 1) 134
M1 45° 45°
7.5 T1
M1

113
75

292)

165
ø13.5
64
89

B; A
T2 Z
max 14.6

263
31 23 T2
70
84

245 25

T1
25
-0.025
0

ø83
ø140

M1

Flange ISO 3019-2

Center of gravity

Ports Standard Size pmax [bar]3) State7)

A, B Working port SAE J518 4)
1 in 530 O
Fastening thread DIN 13 M12 × 1.75; 23 deep
T1 Drain port ISO 61496) M27 × 2; 19 deep 3 X5)
T2 Drain port ISO 61496) M27 × 2; 19 deep 3 O5)
M1 Measuring port, control pressure ISO 6149 6)
M14 × 1.5; 11.5 deep 530 X

1) To shaft collar 5) Depending on installation position, T1 or T2 must be connected

2) Center of gravity (see also installation instructions on page 20).
3) Depending on the application, momentary pressure peaks can occur. 6) The countersink may be deeper than specified in the standard.
Keep this in mind when selecting measuring devices and fittings. 7) O = Must be connected (plugged on delivery)
4) Only dimensions according to SAE J518, metric fastening thread X = Plugged (in normal operation)
is a deviation from the standard.

Bosch Rexroth AG, RE 91650/2023-11-28

Dimensions [mm] Axial piston variable motor | A36VM series 10 13
 Dimensions size 125

▼ Location of working ports on the port plates

2 SAE working ports 1 SAE working ports

A and B at side, opposite View Z A and B at rear (view Z)

220
M1 Detail Y
T1

B
B A
B A

54
Z
T2

Detail Y

5˚

162 50 50
170

▼ Splined shaft DIN 5480 Detail Y

Z9 ‒ W40×2×18×9g
M12x1.751)

28
12
⌀25
57.2
M12
ø50

37 27.8
45

▼ EP5, EP6 – Proportional control, electric, negative control

313

T1
160

B A
216

B; A
T2

M1 M1

1) Center bore according to DIN 332 (thread according to DIN 13)

 RE 91650/2023-11-28, Bosch Rexroth AG

14 A36VM series 10 | Axial piston variable motor Dimensions [mm]
Dimensions size 255

Dimensions size 255

EP1, EP2 – Proportional electric control, positive control

Port plate 1 — SAE working ports A and B at rearn

362
161 210
401) 1602)
45° 45°
7.5 T1 M1
M1

126
90

332)

210
⌀17.5
24
⌀2

75
113

172
B; A
Z

295
T2
max 14.6
39 28 T2
Sa
85
100.5

302 30
309.5

T1
30
⌀180 0-0.025
⌀100

M1

Flange ISO 3019-2

Center of gravity

Ports Standard Size pmax [bar]3) State7)

A, B Working port SAE J518 4)
1 1/4 in 530 O
Fastening thread DIN 13 M14 × 2; 23 deep
T1 Drain port ISO 61496) M33 × 2; 19 deep 3 X5)
T2 Drain port ISO 61496) M33 × 2; 19 deep 3 O5)
M1 Measuring port, control pressure ISO 6149 6)
M14 × 1.5; 11.5 deep 530 X

1) To shaft collar 5) Depending on installation position, T1 or T2 must be connected

2) Center of gravity (see also installation instructions on page 20).
3) Depending on the application, momentary pressure peaks can occur. 6) The countersink may be deeper than specified in the standard.
Keep this in mind when selecting measuring devices and fittings. 7) O = Must be connected (plugged on delivery)
4) Only dimensions according to SAE J518, metric fastening thread X = Plugged (in normal operation)
is a deviation from the standard.

Bosch Rexroth AG, RE 91650/2023-11-28

Dimensions [mm] Axial piston variable motor | A36VM series 10 15
 Dimensions size 255

▼ Location of working ports on the port plates

2 SAE working ports 1 SAE working ports

A and B at side, opposite View Z A and B at rear (view Z)

271 M1
T1 Detail Y

B A B A

64
Z
T2

Detail Y

204.5 64 64
219

▼ Splined shaft DIN 5480 Detail Y

A2 ‒ W50×2×24×9g

36
M16x21)

12
⌀32
66.7
M14
ø70

44
31.8
55

▼ EP5, EP6 – Proportional control, electric, negative control

382
371
T1
172

Sa
7

Sa
B A
249

T2 B; A

M1
M1

1) Center bore according to DIN 332 (thread according to DIN 13)

 RE 91650/2023-11-28, Bosch Rexroth AG

16 A36VM series 10 | Axial piston variable motor
Connector for solenoids

Connector for solenoids

DEUTSCH DT04-2P-EP04
Molded, 2-pin, without bidirectional suppressor diode
The following type of protection ensues with the installed
mating connector:
▶ IP67 (DIN/EN 60529) and
▶ IP69K (DIN 40050-9)

▼ Switching symbol

▼ Mating connector DEUTSCH DT06-2S-EP04

Consisting of DT designation
1 housing DT06-2S-EP04
1 wedge W2S
2 sockets 0462-201-16141

The mating connector is not included in the scope of

delivery.
This can be supplied by Bosch Rexroth on request
(material number R902601804).

Notice
▶ If necessary, you can change the position of the
connector by turning the solenoid body.
▶ The procedure is defined in the instruction manual.

Bosch Rexroth AG, RE 91650/2023-11-28

 Axial piston variable motor | A36VM series 10 17
 Flushing and boost-pressure valve

Flushing and boost-pressure valve

The flushing and boost-pressure valve is used to remove ▼ Circuit diagram EP1, EP2 (positive control)

heat from the hydraulic circuit. M1 Pressure

In a closed circuit, it is used for flushing the housing and retention valve
safeguarding the minimum boost pressure. T1 Flushing orifice

Hydraulic fluid is directed from the respective low-pressure

B
side into the motor housing. This is then fed into the
reservoir, together with the leakage. In the closed circuit,
Vg min
the removed hydraulic fluid must be replaced by cooled
Vg max
hydraulic fluid supplied by the boost pump.
The valve is integrated in the port plate. A
Cracking pressure of pressure retention valve Flushing spool
(observe when setting the primary valve)
T2
▶ fixed setting 16 bar
Switching pressure of flushing spool Δp
▶ 8±1 bar
Flushing flow qv
Orifices can be used to adjust the flushing flows as
required. The following parameters are based on:
ΔpND = pND – pG = 25 bar and ν = 10 mm2/s
(pND = low pressure, pG = case pressure

Flushing valve for size 125

Material number of orifice ⌀ [mm] qv [l/min] Code
R902290106 1.2 3.5 A
R902290107 1.4 5 B
R902290109 1.8 8 C
R902290110 2.0 10 D
R902290111 2.3 12 E
R902290112 2.4 14 F
R902290113 3.0 16 H
Without Without 20 N

Flushing valve for size 255

Material number of orifice ⌀ [mm] qv [l/min] Code
R902290118 1.8 8 C
R902290119 2.0 10 D
R902290120 2.3 12 E
R902290121 2.5 15 G
R902290123 2.8 18 I
R902290124 3.1 21 J
R902290125 3.5 27 K
R902290126 4.0 35 O
R902290127 5.0 50 Q

 RE 91650/2023-11-28, Bosch Rexroth AG

18 A36VM series 10 | Axial piston variable motor Dimensions [mm]
Speed sensor

Speed sensor

The A36VM...W version („prepared for speed sensor“, i.e. ▼ Dimensions

Version „E“ with mounted DST sensor
without sensor) is equipped with a spline on the rotary
group.
C
The motor speed can be recorded by the mounted DST or
DSA speed sensor. The proportional frequency signal
required is generated by splines at the rotary group.

A
In addition to the rotational speed, the DST or DSA sensor
detects the direction of rotation of the motor and the

B
temperature at the installation location.
Type code, technical data, dimensions and details on the
connector, plus safety instructions about the sensor can
be found in the relevant data sheet 95131 (DST) or 95126
(DSA/20).
The sensor is mounted on the port provided for this
purpose with a mounting bolt. On deliveries without
sensor, the port is plugged with a pressure-resistant cover.
We recommend ordering the A36VM variable motor
complete with mounted sensor.

▼ Circuit diagram

M1

U
n T1

Vg min

Vg max

A
NG 125 255
Number of teeth 58 75
T2 A Insertion depth (tolerance -0.25) 18.4 18.4
B Contact surface 79 96
C 74.8 87

Bosch Rexroth AG, RE 91650/2023-11-28

 Axial piston variable motor | A36VM series 10 19
 Setting range for displacement

Setting range for displacement

125 255
Vg max (cm /rev)
3
Vg min (cm /rev)
3
Vg max (cm /rev)
3
Vg min (cm3/rev)
from to from to from to from to

0 126.4 126.4 17.8 17.8 253.2 253.2 37.5 37.5

Without screw Without screw Without screw Without screw
A 126.4 126.4 > 17.8 33 253.2 253.2 > 37.5 62.5
Without screw M12 × 60 Without screw M12 × 70
R909083530 R909085976

Specify exact settings for Vg min and Vg max in plain text

when ordering:
▶ Vg min = ... cm3, Vg max = ... cm3
Theoretical, maximum setting:
▶ for Vg min = 0.3 × Vg max

Settings that are not listed in the table may lead to

damage. Please contact us.

 RE 91650/2023-11-28, Bosch Rexroth AG

20 A36VM series 10 | Axial piston variable motor
Installation instructions

Installation instructions

General Installation position

The axial piston unit must be filled with hydraulic fluid See the following examples 1 to 4.
and air bled during commissioning and operation. Further installation positions are available upon request.
This must also be observed following a longer standstill as Recommended installation position: 1 and 2
the axial piston unit may empty via the hydraulic lines.
The leakage in the housing area must be directed to the Below-reservoir installation (standard)
reservoir via the highest drain port (T1, T2). Below-reservoir installation means that the axial piston
If a shared drain line is used for several units, make sure unit is installed outside of the reservoir below the
that the respective case pressure in each unit is not minimum fluid level.
exceeded. The shared drain line must be dimensioned to
ensure that the maximum permissible case pressure of all ▼ Installation position 1

connected units is not exceeded in any operating Air bleed Filling

condition, particularly at cold start. If this is not possible, T1 (F) T1 (F)
separate drain line must be laid.
F
To prevent the transmission of structure-borne noise, ht min
use elastic elements to decouple all connecting lines from all
hmin
vibration-capable components (e.g. reservoir, frame parts). T1
Under all operating conditions, the drain line must flow
into the reservoir below the minimum fluid level.

Notice T2
In certain installation positions, an influence on the
adjustment or control can be expected. Gravity,
dead weight and case pressure can cause minor
characteristic shifts and changes in actuating time. ▼ Installation position 2

Air bleed Filling

Key T2 (F) T2 (F)
F Filling/air bleeding
T1, T2 Drain port
F
ht min Minimum required immersion depth (200 mm) ht min
hmin Minimum required distance to reservoir bottom (100 mm) hmin
T2

Notice
Port F is part of the external piping and must be
provided on the customer side to simplify the filling
T1
and air bleeding.

Bosch Rexroth AG, RE 91650/2023-11-28

 Axial piston variable motor | A36VM series 10 21
 Installation instructions

Above-reservoir installation
Above-reservoir installation means that the axial piston
unit is installed above the minimum fluid level of the
reservoir.

▼ Installation position 3

Air bleed Filling

T1 (F) T1 (F)

F
T1

T2

ht min
hmin

▼ Installation position 4

Air bleed Filling

T2 (F) T2 (F)

T2

T1
ht min
hmin

 RE 91650/2023-11-28, Bosch Rexroth AG

22 A36VM series 10 | Axial piston variable motor
Project planning notes

Project planning notes

▶ The motor A36VM is designed to be used in closed ▶ Please note that a hydraulic system is an oscillating
circuits. system. This can lead, for example, to the stimulation
▶ The project planning, installation and commissioning of the natural frequency within the hydraulic system
the axial piston unit requires the involvement of skilled during operation at constant rotational speed over
personnel. a long period of time. The frequency of the motor to be
▶ Before using the axial piston unit, please read the observed is 9 times the rotational speed frequency.
corresponding instruction manual completely and This can be prevented, for example, with suitably
thoroughly. If necessary, this can be requested from designed hydraulic lines.
Bosch Rexroth. ▶ Please note the details regarding the tightening torques
▶ Before finalizing your design, please request a binding of port threads and other threaded joints in the
installation drawing. instruction manual.
▶ The specified data and notes contained herein must be ▶ The ports and fastening threads are designed for the
observed. permissible pressures pmax of the respective ports,
▶ For safety reasons, controls with beginning of control see the connection tables. The machine or system
at Vg min (e.g., EP1/2) are not permissible for winch manufacturer must ensure that the connecting
drives, e.g. anchor winches! elements and lines correspond to the specified
▶ Depending on the operating conditions of the application conditions (pressure, flow, hydraulic fluid,
axial piston unit (working pressure, fluid temperature), temperature) with the necessary safety factors.
the characteristic curve may shift. ▶ The service ports and function ports are only intended
▶ Preservation: Our axial piston units are supplied as to accommodate hydraulic lines.
standard with preservation protection for a maximum ▶ Please note that the series connection of motors and
of 12 months. If longer preservation protection is the operation under summation pressure affect the
required (maximum 24 months), please specify this in efficiency of the units.
plain text when placing your order. The preservation ▶ The control behavior of the motor can change slightly
periods apply under optimal storage conditions, details due to natural influences such as running-in or setting
of which can be found in the data sheet 90312 or the behavior over time. Calibration may be required.
instruction manual.
▶ Not all configuration variants of the product are
approved for use in a safety function according to
ISO 13849. Please consult the responsible contact
person at Bosch Rexroth if you require reliability
parameters (e.g. MTTFD) for functional safety.
▶ Depending on the type of control used,
electromagnetic effects can be produced when using
solenoids. Applying a direct voltage signal (DC) to
solenoids does not create electromagnetic interference
(EMI) nor is the solenoid affected by EMI.
Electromagnetic interference (EMI) potential exists
when operating and controlling a solenoid with
a modulated direct voltage signal (e.g. PWM signal)
Appropriate testing and measures should be taken by
the machine manufacturer to ensure other components
or operators (e.g. with pacemaker) are not affected by
this potential.
▶ A pressure relief valve must be provided in the
hydraulic system. In this connection, observe the
technical limits of the pressure relief valve.

Bosch Rexroth AG, RE 91650/2023-11-28

 Axial piston variable motor | A36VM series 10 23
 Safety instructions

Safety instructions

▶ During and shortly after operation, there is a risk of

burns on the axial piston unit and especially on the
solenoids. Take the appropriate safety measures
(e.g. by wearing protective clothing).
▶ Moving parts in control equipment (e.g. valve spools)
can, under certain circumstances, get stuck in position
as a result of contamination (e.g. contaminated
hydraulic fluid, abrasion, or residual dirt from
components). As a result, the hydraulic fluid flow and
the build-up of torque in the axial piston unit can no
longer respond correctly to the operator’s
specifications. Even the use of various filter elements
(external or internal flow filtration) will not rule out
a fault but merely reduce the risk.
The machine/system manufacturer must test whether
remedial measures are needed on the machine for the
application concerned in order to bring the driven
consumer into a safe position (e.g. safe stop) and
ensure any measures are properly implemented.
▶ In certain conditions, moving parts in high-pressure relief
valves might get stuck in an undefined position due to
contamination (e.g. contaminated hydraulic fluid).
This can result in restriction or loss of load-holding
functions in lifting winches.
Therefore it is the machine and/or system manufacturers
responsibility to make sure that the load can always be
put in a safe mode if needed. Also, he needs to ensure
that these measures are properly implemented.
▶ When using the axial piston motor in winch drives,
make certain that the technical limit values are not
exceeded under all operating conditions. If the
axial piston motor is extremely overloaded
(e.g. if the maximum permissible rotational speeds
are exceeded during weighing of the anchor while the
ship is in motion), the rotary group may be damaged
and, in the worst case, the axial piston motor may
burst. The machine manufacturer/system manufacturer
is to undertake additional measures, up to and
including encapsulation.

 RE 91650/2023-11-28, Bosch Rexroth AG

24 A36VM series 10 | Axial piston variable motor
Related documentation

Related documentation

Product-specific documentation
Document type Title Document number
Instruction manual Axial piston variable motor A36VM series 10, A36VM/A36VE series 50 91650-01-B
Data sheet Storage and preservation of axial piston units 90312

Documentation for mounted components

Document type Title Document number
Data sheet BODAS speed sensor DST, series 10 95131
BODAS speed sensor DSA, series 20 95126
Instruction manual BODAS speed sensors 95290-01-B

Documentation for hydraulic fluids

Document type Title Document number
Data sheet Hydraulic fluids based on mineral oils and related hydrocarbons 90220
Rating of hydraulic fluids used in Rexroth hydraulic components (pumps and motors) 90235
Bosch Rexroth Fluid Rating List for Rexroth hydraulic components (pumps and motors) 90245

Bosch Rexroth AG © Bosch Rexroth AG 2021. All rights reserved, also regarding any disposal,
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89275 Elchingen applications for industrial property rights. The data specified within only
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Tel. +49 7308 82-0 developed, no statements concerning a certain condition or suitability for
info.ma@boschrexroth.de a certain application can be derived from our information. The information
www.boschrexroth.com 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.

Bosch Rexroth AG, RE 91650/2023-11-28