axial piston variable pump a10vo series 52 and 53 · pdf filebosch rexroth ag, re...
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RE 92703/10.2014, Bosch Rexroth AG
A10VO 63DRS/53...
Features ▶ Variable axial piston pump of swashplate design for
hydrostatic drives in open circuit. ▶ The flow is proportional to the drive speed and the
displacement. ▶ The flow can be infinitely varied by adjusting the swash-
plate angle. ▶ Stable storage for long service life ▶ High permissible drive speed ▶ Favorable power-to-weight ratio – compact dimensions ▶ Low noise ▶ Excellent suction characteristics ▶ Electro-hydraulic pressure control ▶ Power control ▶ Electro-proportional swivel angle control ▶ Short response times
▶ Sizes 10 to 100 ▶ Nominal pressure 250 bar ▶ Maximum pressure 315 bar ▶ Open circuit
Axial piston variable pumpA10VO series 52 and 53
RE 92703Edition: 10.2014Replaces: 08.2011
ContentsOrdering code 2Hydraulic fluids 5Operating pressure range 7Technical data 8DR – Pressure control 10DRG – Pressure control remotely operated 11DRF (DFR) / DRS (DFR1) / DRSC Pressure and flow control 12LA... – Pressure, flow and power control 14LA... – Variations 15ED – Electro-hydraulic pressure control 16ER – Electro-hydraulic pressure control 17EP – Electro-proportional control 18EK – Electro-proportional control with controller cut-off 19EP(K).DF / EP(K).DS / EP(K) with pressure and flow control 20EP.ED / EK.ED with electro-hydraulic pressure control 21Dimensions, size 10 to 100 22Dimensions through drive 54Overview of attachment options 58Combination pumps A10VO + A10VO 59Connector for solenoids 60Installation instructions 61Project planning notes 64Safety instructions 64
Bosch Rexroth AG, RE 92703/10.2014
2 A10VO series 52 and 53 | Axial piston variable pumpOrdering code
Ordering code
01 02 03 04 05 06 07 08 09 10 11 12
A10V(S) O / 5x – V
Axial piston unit 10 18 28 45 601) 63 72 85 10001 Swashplate design, variable, nominal pressure 250 bar, maximum pressure 315 bar ● – – – – – – – – A10VS
– ● ● ● ● ● ● ● ● A10V
Operation mode02 Pump, open circuit O
Size (NG)03 Geometric displacement, see table of values on page 6 10 18 28 45 60 63 72 85 100
Control devices04 Pressure control hydraulic ● ● ● ● ● ● ● ● ● DR
with flow control hydraulic X-T open ● – ● ● ● – – ●3) – DFR
– ● – – – ● ● ●2) ● DRF
X-T plugged ● – ● ● ● – – ●3) – DFR1
with flushing function – ● – – – ● ● ●2) ● DRS
without flushing function ● ● ● ● ● ● ● ● ● DRSC
electrically overridden (negative control) – ○ ○ ○ – ● ● ● ○ EF.D.4)
pressure cut-off hydraulic remotely operated ● ● ● ● ● ● ● ● ● DRG
electric negative control U = 12 V – ● ● ● ● ● ● ● ● ED71
U = 24 V – ● ● ● ● ● ● ● ● ED72
electric positive control U = 12 V – ● ● ● ● ● ● ● ● ER715)
U = 24 V – ● ● ● ● ● ● ● ● ER725)
Power control with pres-sure cut-off
hydraulic start of control from 10 to 35 bar – ● ● ● – ● ● ● ● LA5D
36 to 70 bar – ● ● ● – ● ● ● ● LA6D
71 to 105 bar – ● ● ● – ● ● ● ● LA7D
106 to 140 bar – ● ● ● – ● ● ● ● LA8D
141 to 230 bar – ● ● ● – ● ● ● ● LA9D
remotely operated hydraulic start of control see LA.D – ● ● ● – ● ● ● ● LA.DG
flow control, X-T plugged
hydraulic start of control see LA.D – ● ● ● – ● ● ● ● LA.DS
electrically overridable (negative control)
start of control see LA.D
– ● ● ● – ● ● ● ● LA.S
Proportional control electric positive control
with pressure control U = 12 V – ● ● ● – ● ● ● ● EP1D
U = 24 V – ● ● ● – ● ● ● ● EP2D
with pressure and flow control (load sensing)
X-T open U = 12 V – ● ● ● – ● ● ● ● EP1DF
U = 24 V – ● ● ● – ● ● ● ● EP2DF
with pressure and flow control (load sensing)
X-T plugged U = 12 V – ● ● ● – ● ● ● ● EP1DS
U = 24 V – ● ● ● – ● ● ● ● EP2DS
with electro-hydraulic pressure control
U = 12 V – ● ● ● – ● ● ● ● EP1ED
U = 24 V – ● ● ● – ● ● ● ● EP2ED1) Series 52 units are delivered as standard with 60 cm3. Higher
values on request2) Series 53 only with D flange3) Series 52 only with C flange4) See data sheet 92709
5) The following must be taken into account during project planning: Excessive current levels (I > 1,200 mA with 12 V or I > 600 mA with 24 V) to the ER solenoid can result in undesired increase of pressure which can lead to pump or system damage: - Use Imax current limiter solenoids. - An intermediate-plate pressure controller can be used to protect the pump in the event of overflow. An accessory kit with intermediate plate pressure controller can be ordered from Bosch Rexroth under part number R902490825.
RE 92703/10.2014, Bosch Rexroth AG
3 Axial piston variable pump | A10VO series 52 and 53 Ordering code
10 18 28 45 601) 63 72 85 10004 Proportional control electric positive control
Pressure and flow control with controller cut-off (load sensing)
X-T open U = 12 V – ● ● ● – ● ● ● ● EK1DF
U = 24 V – ● ● ● – ● ● ● ● EK2DF
Pressure and flow control with controller cut-off (load sensing)
X-T plugged U = 12 V – ● ● ● – ● ● ● ● EK1DS
U = 24 V – ● ● ● – ● ● ● ● EK2DS
Electro-hydraulic pressure control with controller cut-off
U = 12 V – ● ● ● – ● ● ● ● EK1ED
U = 24 V – ● ● ● – ● ● ● ● EK2ED
Series05 Series 5, index 2 ● – ● ● ● – – ● – 526)10)
Series 5, index 3 – ● ● ● – ● ● ● ● 537)8)9)
Direction of rotation06 View on drive shaft clockwise R
counter clockwise L
Sealing material07 FKM (fluor-caoutchouc) V
Drive shaft08 Splined shaft standard shaft ● ● ● ● ● ● ● ● ● S
ANSI B92.1a similar to shaft “S” however for higher input torque – ● ● ● ● ● ● – – R
reduced diameter, limited suitability for through drive ● ● ○ ● ● ● ● ● ● U
similar to shaft “U”, however for higher torque – – ○ ● ● ● ● ● ● W
Parallel keyed shaft DIN 6885 limited suitability for through drive ● ● ○ ○ – – – – ○ P
Mounting flange09 ISO 3019-2 (ISO) 2-hole ● – – – – – – – – A
ISO 3019-1 (SAE) 2-hole ● ● ● ● ● ● ● ● ● C
4-hole – – – – ● ● ● ●11) ● D
Working port10 SAE flange port
metric fastening threadrear not for through drive – ● ● ● ● ● ● ● ● 11
at side, opposite for through drive – ● ● ● ● ● ● ● ● 12
at side, offset 90° not for through drive; available only for counter-clockwise rotation
– – – ● – – – – – 13
Metric threaded port rear not for through drive ● – – – – – – – – 14
01 02 03 04 05 06 07 08 09 10 11 12
A10V(S) O / 5x – V
6) Control DR, DFR, DFR1, DRG, ED and ER: delivery with nominal sizes 10, 28, 45, 60 and 8510) only in series 52
7) Control DR, DRF, DRS, DRG, ED and ER: delivery with nominal sizes 18, 63, 72, 859) and 100 only in series 53
8) Control EF., LA.., EP.. and EK..: delivery with nominal sizes 18 to 100 only in series 53
9) Control DRF and DRS: delivery with nominal size 85 only with D flange in series 53
10) Control DFR, DFR1: delivery with nominal size 85 only with C flange in series 52
11) Only available in series 53. For controller designation and series assignment, please refer to positions 04, 05, including footnotes.
Bosch Rexroth AG, RE 92703/10.2014
4 A10VO series 52 and 53 | Axial piston variable pumpOrdering code
Through drive (for attachment options, see page 37)
11 Flange ISO 3019-1 Hub for splined shaft12)
Diameter Diameter 10 18 28 45 601) 63 72 85 100without through drive – ● ● ● ● ● ● ● ● N00
82-2 (A) 5/8 in 9T 16/32DP – ● ● ● ● ● ● ● ● K01
3/4 in 11T 16/32DP – ● ● ● ● ● ● ● ● K52
101-2 (B) 7/8 in 13T 16/32DP – – ● ● ● ● ● ● ● K68
1 in 15T 16/32DP – – – ● ● ● ● ● ● K04
127-4 (C) 1 1/4 in 14T 12/24DP – – – – ● ● ● ● ● K15
1 1/2 in 17T 12/24DP – – – – – – – ● ● K16
127-2 (C) 1 1/4 in 14T12/24DP – – – – – – – ● ● K07
1 1/2 in 17T 12/24DP – – – – – – ● ● K24
Connector for solenoids12 DEUTSCH – molded connector, 2-pin – without suppressor diode (for electric controls) – ● ● ● ● ● ● ● ● P
● = Available ○ = On request – = Not available
Note ▶ Note the project planning notes on page 64! ▶ Preservation:
– Up to 12 months as standard – Up to 24 months long-term (state in plain text when
ordering)
01 02 03 04 05 06 07 08 09 10 11 12
A10V(S) O / 5x – V
12) According to ANSI B92.1a
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Hydraulic fluids
5
Hydraulic fluids
The A10VO 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
Notes on selection of hydraulic fluidThe 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).
NoteAt 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 the above conditions cannot be maintained due to extreme operating parameters, please contact the respon-sible member of staff at Bosch Rexroth.
Viscosity and temperature of hydraulic fluids
Viscosity Temperature Comment
Cold start νmax ≤ 1600 mm2/s θSt ≥ -40 °C t ≤ 1 min, without load (p ≤ 30 bar), n ≤ 1000 rpm
Permissible temperature difference ΔT ≤ 25 K between axial piston unit and hydraulic fluid
Warm-up phase ν < 1600 to 400 mm2/s θ = -40 °C to -25 °C Note the detailed information on operation with low tempera-tures, see data sheet 90300-03-B.
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 page 5)
θ = -25 °C to +110 °C measured at port LNote the permissible temperature range of the shaft seal(ΔT = approx. 5 K between the bearing/shaft seal and port L)
νopt = 36 to 16 mm2/s Range of optimum operating viscosity and efficiency
Short-term operation νmin ≥ 7 mm2/s t < 1 min, p < 0.3 • pnom
▼ Selection diagram
Range of optimum operating viscosity vopt
Optimum efficiency
Maximum permissible viscosity for cold start
Minimum permissible viscosity for short-term operation
Temperature θ [°C]
Visc
osity
ν [
mm
2 /s]
Con
tinuo
us o
pera
tion
Warm-up phase
Minimum permissible temperature for cold start-40 -25 -10 10 30 50 90 115700
7
10
4060
20
100
200
400600
10001600
VG 22VG 32VG 46VG 68VG 100
16
36
Bosch Rexroth AG, RE 92703/10.2014
6 A10VO series 52 and 53 | Axial piston variable pumpOrdering code
Filtration of the fluidThe finer the filtration, the better the hydraulic fluid cleanli-ness level, and the longer 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 115 °C), a cleanliness level of at least 19/17/14 according to ISO 4406 is necessary. Please contact us if the above classes cannot be observed.
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Operating pressure range
7
t1
t2tn
Operating pressure range
Pressure at working port B Definition
Nominal pressure pnom 250 bar absolute The nominal pressure corresponds to the maximum design pressure.
Maximum pressure pmax 315 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 2.5 ms
Total operating period 300 h
Minimum pressure pB abs
(high pressure side)10 bar absolute Minimum pressure on the high-pressure side (B) which is required in order 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 pressure reduction during a pressure change over the entire pressure range.
Pressure at suction port S (Inlet)
Minimum pressure pS min
Standard 0.8 bar absolute Minimum pressure at suction port S (inlet) that is required in order to avoid dam-age to the axial piston unit. The minimum pressure depends on the speed and displacement of the axial piston unit.
Maximum pressure pS max 5 bar absolute
Case drain pressure at port L1, L2
Maximum pressure pL max 2 bar absolute Maximum 0.5 bar higher than inlet pressure at port S, but not higher than pL max.A case drain line to the reservoir is required.
▼ Rate of pressure change RA max
Time t
Pres
sure
p
▼ Maximum permissible speed (limit speed) Permissible speed by increasing inlet pressure pabs at suction opening S or at Vg ≤ Vgmax
Displacement Vg/Vgmax
Spee
d n/
n max
Inle
t pr
essu
re p
abs b
ar
▼ Pressure definition
Pres
sure
p
Single operating period
Minimum pressure (high pressure side)
Maximum pressure pmax
Nominal pressure pnom
Time t
Total operating period = t1 + t2 + ... + tn
NoteOperating pressure range valid when using hydraulic fluids based on mineral oils. Please contact us for values for other hydraulic fluids.
pnom
∆t
∆p
1.00.90.80.7
1.2
1.1
1.0
0.9
1.6
1.4
1.2
1.0
0.9
0.8
Bosch Rexroth AG, RE 92703/10.2014
8 A10VO series 52 and 53 | Axial piston variable pumpTechnical data
Technical data
Size NG 10 18 28 45 601) 632) 72 85 100
Displacement, geometric, per revolution Vg max cm3 10.5 18 28 45 60 63 72 85 100
Maximum rotational speed3)
at Vg max nnom min–1 3600 3300 3000 26004) 2700 2600 2600 2500 2300
at Vg <Vg max nmax
perm
min–1 4320 3960 3600 3120 3140 3140 3140 3000 2500
Flow at nnom and Vg max qv l/min 37 59 84 117 156 163 187 212 230
at nE = 1500 rpm qvE l/min 15 27 42 68 90 95 108 128 150
Power at nnom, Vg max and Δp = 250 bar
P kW 16 25 35 49 65 68 77 89 96
at nE = 1500 rpm PE kW 7 11 18 28 37 39 45 53 62
Torque at Vg max and Δp = 250 bar
T Nm 42 71 111 179 238 250 286 338 398
at Vg max and Δp = 100 bar
T Nm 17 29 45 72 95 100 114 135 159
Rotary stiffness of drive shaft
S c Nm/rad 9200 11000 22300 37500 65500 65500 65500 143000 143000
R c Nm/rad – 14800 26300 41000 69400 69400 69400 – –
U c Nm/rad 6800 8000 – 30000 49200 49200 49200 102900 102900
W c Nm/rad – – – 34400 54000 54000 54000 117900 117900
P c Nm/rad 10700 13100 – – – – – – –
Moment of inertia for rotary group JTW kgm2 0.0006 0.0009 0.0017 0.003 0.0056 0.0056 0.0056 0.012 0.012
Maximum angular acceleration5) α rad/s² 8000 6800 5500 4000 3300 3300 3300 2700 2700
Case volume V L 0.2 0.25 0.3 0.5 0.8 0.8 0.8 1 1
Weight without through drive (approx.) m kg 8 11.5 15 18 22 22 22 36 36
Weight with through drive (approx.) – 13 18 24 28 28 28 45 45
Determining the 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)
Note ▶ 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. We recommend testing the loads by means of experiment or calculation / simulation and compari-son with the permissible values.
▶ Transport and storage – θmin ≥ –50 °C – θopt = +5 °C to +20 °C
1) Only series 522) Only series 533) The values are applicable:
‒ 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
4) Please contact us regarding higher speeds
5) The scope of application lies between the minimum necessary and the maximum permissible drive speeds. It applies for external stim-uli (e. g. engine 2 to 8 times rotary frequency, cardan shaft twice the rotary frequency). The limiting value is only valid for a single pump. The loading capacity of the connecting parts must be taken into account.
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Technical data
9
TE
TD
T1 T2
T3
Permissible radial and axial forces on the drive shaft
Size NG 10 18 28 45 60/63 72 85 100
Radial force maximum at a/2 ± Fq max N 250 350 1200 1500 1700 1500 2000 2000
Axial force maximum± Fax
+ Fax max N 400 700 1000 1500 2000 1500 3000 3000
Note ▶ The values given are maximum values and do not apply
to continuous operation. For drives with radial loading (pinion, V-belt drives), please contact us!
Permissible input and through-drive torques
Size 10 18 28 45 60/63 72 85 100
Torque at Vg max and Δp = 250 bar1) T max Nm 42 71 111 179 250 321 338 398
Input torque at drive shaft, maximum2)
S TE max Nm 126 124 198 319 630 630 1157 1104
Ø in 3/4 3/4 7/8 1 1 1/4 1 1/4 1 1/2 1 1/2
R TE max Nm – 160 250 400 650 650 – –
Ø in – 3/4 7/8 1 1 1/4 1 1/4 – –
U TE max Nm 60 59 105 188 306 306 628 595
Ø in 5/8 5/8 3/4 7/8 1 1 1 1/4 1 1/4
W TE max Nm – – 140 220 396 383 650 636
Ø in – – 3/4 7/8 1 1 1 1/4 1 1/4
P TE max Nm 90 88 137 200 – – – 857
Ø mm 18 18 22 25 – – – 40
Maximum through-drive torque
S TD max Nm – 108 160 319 484 484 698 778
R TD max Nm – 120 176 365 484 484 – –
U TD max Nm – 59 105 188 306 306 628 595
W TD max Nm – – 140 220 396 383 650 636
P TD max Nm – 88 137 200 – – – 778
▼ Distribution of torques
1st pump 2nd pump
Torque at 1st pump T1
Torque at 2nd pump T2
Torque at 3rd pump T3
Input torque TE = T1 + T2 + T3
TE < TE max
Through-drive torque TD = T2 + T3 TD < TD max
Fq
a
a/2 a/2
1) Without considering efficiency2) For drive shafts with no radial force
Bosch Rexroth AG, RE 92703/10.2014
10 A10VO series 52 and 53 | Axial piston variable pumpDR – Pressure control
DR – Pressure control
The pressure control limits the maximum pressure at the pump outlet within the control range of the variable pump. The variable pump only supplies as much hydraulic fluid as is required by the consumers. If the operating pressure exceeds the pressure setting at the pressure valve, the pump will regulate to a smaller displacement to reduce the control differential.
▶ Basic position in depressurized state:Vg max. ▶ Setting range1) for pressure control 35 to 250 bar.
Standard is 250 bar.
▼ Characteristic curve DR
250
qv min qv max
35
Ope
ratin
g pr
essu
re p
B [
bar]
Flow qV [l/min]
Hys
tere
sis/
pres
sure
ris
e Δp
max
Characteristic curve valid for n1 = 1500 rpm and tfluid = 50 °C.
▼ Circuit diagram: DR
SL2
BL1L
Controller data
NG 10 18 28 45 6063
72 85 100
Pressure increase
Δp [bar] 6 6 6 6 8 8 12 14
Hysteresis and repeat-ability
Δp [bar] maximum 3
Control fluid consumption
l/min maximum approx. 3
1) In order to prevent damage to the pump and the system, the per-missible setting range must not be exceeded. The range of possi-ble settings at the valve is higher.
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 DRG – Pressure control remotely operated
11
DRG – Pressure control remotely operated
For the remote-controlled pressure control, the target pressure can be set using a separately arranged pressure relief valve. Pressure control DR see page 10.A pressure relief valve can be externally piped to port X for remote setting of pressure below the setting of the DR control valve spool. This relief valve is not included in the delivery contents of the pump.The differential pressure at the DRG control valve is set as standard to 20 bar. This results in a pilot oil flow to the relief valve of approx. 1.5 l/min at port X. If another setting is required (range from 10-22 bar) please state in clear text.As a separate pressure relief valve we can recommend:DBDH 6 (hydraulic) to RE 25402 orDBETR-SO 381 with orifice Ø 0.8 mm in P (electric) to RE 29166.The max. length of piping should not exceed 2 m.
▶ Basic position in depressurized state:Vg max. ▶ Setting range1) for pressure control 20 to 250 bar.
Standard is 250 bar.
▼ Characteristic curve DRG
250
qv min qv max
20
Ope
ratin
g pr
essu
re p
B [
bar]
Flow qV [l/min]
Hys
tere
sis/
pres
sure
ris
e Δp
max
Characteristic curve valid at n1 = 1500 rpm and tfluid = 50 °C.
▼ Circuit diagram DRG
SL2
BL
X
L1
Controller data
NG 10 18 28 45 6063
72 85 100
Pressure increase
Δp [bar] 6 6 6 6 8 8 12 14
Hysteresis and repeat-ability
Δp [bar] maximum 3
Control fluid consumption
l/min maximum approx. 4.5
1) In order to prevent damage to the pump and the system, the per-missible setting range must not be exceeded. The range of possi-ble settings at the valve is higher.
Bosch Rexroth AG, RE 92703/10.2014
12 A10VO series 52 and 53 | Axial piston variable pumpDRF (DFR) / DRS (DFR1) / DRSC – Pressure and flow control
DRF (DFR) / DRS (DFR1) / DRSC – Pressure and flow control
In addition to the pressure control function (see page 10), a variable orifice (e.g. directional valve) is used to adjust the differential pressure upstream and down-stream of the orifice. This is used to control the pump flow. The pump flow is equal to the actual required flow by the consumer, regardless of changing pressure levels. The pressure control overrides the flow control function.
▶ Basic position in depressurized state:Vg max. ▶ Setting range1) for pressure control 35 to 250 bar.
Standard is 250 bar.
▼ Characteristic curve DRF (DFR) / DRS (DFR1) / DRSC
250
qv min qv max
35
0
Ope
ratin
g pr
essu
re p
B [
bar]
Flow qV [l/min]
Hys
tere
sis/
pres
sure
ris
e Δp
max
▼ Characteristic curve at variable speed
qV max
qV min
n0
n maxSpeed n [rpm]
Flow
qV [
l/m
in]
Hys
tere
sis/
Pres
sure
incr
ease
Δq V
max
Characteristic curves valid for n1 = 1500 rpm and tfluid = 50 °C.
Possible connections at port B (not included in the delivery contents)
LS mobile control blocks Data sheets
M4-12 64276
M4-15 64283
LUDV mobile control blocks
M6-15 64284
M7-22 64295
▼ DRF (DFR) schematic
SL2
BL
X
1
L1
Plugged at DRS (DFR1) / DRSC valve
1 The metering orifice (control block) and the line is not included in the delivery contents.
NoteThe DRS (DFR1) and DRSC valve versions have no pilot line between X and the reservoir.Unloading the LS-pilot line must be possible in the valve system.Because of the flushing function sufficient unloading of the flow control in DRS (DFR1) control valve X-line must also be provided.If the unloading of the X line does not have to be guaran-teed, the DRSC control valve must be used.
For further information see page 13
1) In order to prevent damage to the pump and the system, the per-missible setting range must not be exceeded. The range of possi-ble settings at the valve is higher.
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 DRF (DFR) / DRS (DFR1) / DRSC – Pressure and flow control
13
Differential pressure ∆p: ▶ Standard setting: 14 to 22 bar.
If another setting is required, please state in clear text.Relieving the load on port X to the reservoir results in a zero stroke (“standby”) pressure which lies about 1 to 2 bar higher than the differential pressure ∆p).No account is taken of system influences.
Controller data ▶ DR Pressure control data see page 10. ▶ Maximum flow deviation measured at drive speed
n = 1500 rpm.
NG 10 18 28 45 60 63
72 85 100
Flow deviation
Δq vmax [l/min]
0.5 0.9 1.0 1.8 2.5 2.5 3.1 3.1
Hysteresis and repeat-ability
Δp [bar] maximum 3
Control fluid consumption
l/min maximum approx. 3 to 4.5 (DRF (DFR)) maximum approx. 3 (DRS (DFR1) / DRSC)
Bosch Rexroth AG, RE 92703/10.2014
14 A10VO series 52 and 53 | Axial piston variable pumpLA... – Pressure, flow and power control
LA... – Pressure, flow and power control
Pressure control equipped as DR(G), see page 10 (11).
Equipment of the flow control like DRS (DFR1), see page 12.In order to achieve a constant drive torque with varying operating pressures, the swivel angle and with it the vol-ume flow from the axial piston pump is varied so that the product of flow and pressure remains constant. Flow con-trol is possible below the power control curve. When
ordering please state the power characteristics to be set ex works in clear text, e.g. 20 kW at 1500 rpm.Control data
▶ For technical data of pressure control DR see page 10.
▶ For technical data of flow control FR see page 12. ▶ Control fluid consumption max. approx. 5.5 l/min
Torque T [Nm] for nominal size
Start of control 18 28 45 63 72 85 100 Order code
10 to 35 bar 3.8 – 12.1 6 – 19 10 – 30 15 – 43 17 – 49.2 20 – 57 24 – 68 LA5
36 to 70 12.2 – 23.3 19.1 – 36 30.1 – 59 43.1 – 83 49.3 – 94.9 57.1 – 112 68.1 – 132 LA6
71 to 105 23.4 – 33.7 36.1 – 52 59.1 – 84 83.1 – 119 95.0 – 136.0 112.1 – 160 132.1 – 189 LA7
106 to 140 33.8 – 45 52.1 – 70 84.1 – 112 119.1 – 157 136.1 – 179.4 160.1 – 212 189.1 – 249 LA8
141 – 230 45.1 – 74.8 70.1 – 117 112.1 – 189 157.1 – 264 179.5 – 301.7 212.1 – 357 249.1 – 419 LA9
Conversion of the torque values in power [kW]
P=T
[kW] (at 1500 rpm) or P=2 x T x n
[kW] (rotational speeds, see table on page 8)6.4 60000
▼ Characteristic curve LA.DS
0 100
0
50
100
150
200
250
300
0 100
∆qV
LA9
LA8
LA7
LA5
LA6
LA9
LA8
LA7
LA5
LA6
Volume flow qV [%]
Ope
ratin
g pr
essu
re p
B [b
ar]
Torq
ue T
[Nm
]
Volume flow qV [%]
▼ Circuit diagram LA.DS (for further combination options with LA.. see page 15)
SL2
BL
X X
L1
1
1 The metering orifice (control block) and the line is not included in the delivery contents.
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 LA... – Variations
15
LA... – Variations
▼ Circuit diagram LA.D with pressure cut-off
SL2
BL L1
▼ Circuit diagram LA.DG with pressure cut-off, remotely operated
SL2
BL L1
1
XX
1 The metering orifice (control block) and the line is not included in the delivery contents.
▼ Circuit diagram LA.S with separate flow control
SL2
BL
X
L1
1
1 The metering orifice (control block) and the line is not included in the delivery contents.
Bosch Rexroth AG, RE 92703/10.2014
16 A10VO series 52 and 53 | Axial piston variable pumpED – Electro-hydraulic pressure control
ED – Electro-hydraulic pressure control
The ED valve is set to a certain pressure by a specified variable solenoid current.When a change is made at the consumer (load pressure), the position of the control piston will shift.This causes an increase or decrease in the pump swivel angle (flow) in order to maintain the electrically set pressure level.The pump thus only delivers as much hydraulic fluid as the consumers can take. The desired pressure level can be set steplessly by varying the solenoid current.As the solenoid current signal drops towards zero, the pressure will be limited to pmax by an adjustable hydraulic pressure cut-off (secure fail safe function in case of a loss of power, e.g. for fan drives ). The response time character-istic curve of the ED-control was optimized for the use as a fan drive system. When ordering, specify the type of appli-cation in clear text.
▼ Static current-pressure characteristic curve ED (negative characteristic curve measured with pump in zero stroke)
250
0 I/Imax1
ED
140
Amperage
Ope
ratin
g pr
essu
re p
B [
bar] De-activation of
control
Min. adjustable control pressure
Max. adjustable control pressure
▶ Hysteresis static < 3 bar.
▼ Flow-pressure characteristic curve
250
qv min qv max
140
Max
imum
ope
ratin
g pr
essu
re P
[ba
r](d
e-en
ergi
zed)
Sett
ing
rang
e
Flow qV [l/min]
Hys
tere
sis/
pres
sure
ris
e Δp
max
< 4
bar
▶ Characteristic curves valid for n1 = 1500 rpm and tfluid = 50 °C.
▶ Pilot fluid consumption: 3 to 4.5 l/min. ▶ Standby standard setting 23 bar. Other values on
request.
▼ Influence of the pressure setting on standby (maximally energized)
30
28
34
32
26
24
22
2018
1614
120 140 160 180 200 220 240250
Maximum pressure setting [bar]
Stan
dby
[bar
] ▼ Circuit diagram ED71/ED72
SL2
BL
X
L1
Technical data, solenoid ED71 ED72
Voltage 12 V (±20%) 24 V (±20%)
Control current
Start of control at p min 100 mA 50 mA
End of control at p max 1200 mA 600 mA
Limiting current 1.54 A 0.77 A
Nominal resistance (at 20 °C) 5.5 Ω 22.7 Ω
Dither frequency 100 to200 Hz
100 to200 Hz
Actuated time 100% 100%
Type of protection: see connector version page 60
Operating temperature range at valve -20 °C to +115 °C
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 ER – Electro-hydraulic pressure control
17
ER – Electro-hydraulic pressure control
The ER valve is set to a certain pressure by a specified variable solenoid current.When a change is made at the consumer (load pressure), the position of the control piston will shift.This causes an increase or decrease in the pump swivel angle (flow) in order to maintain the electrically set pressure level.The pump thus only delivers as much hydraulic fluid as the consumers can take. The desired pressure level can be set steplessly by varying the solenoid current.As the solenoid current signal drops towards zero, the pressure will be limited to pmin (stand by).Observe the project planning notes on page 2.
▼ Static current-pressure characteristic curve ER (positive characteristic curve measured with pump in zero stroke)
0 10
5014
150
250
350
Current I/Imax
Maximum adjustable control pressure
Minimum adjustable control pressure
Ope
ratin
g pr
essu
re p
B [b
ar]
▶ Hysteresis static current-pressure characteristic curve < 3 bar.
▶ Influence of pressure setting on stand-by ± 2 bar
▼ Flow-pressure characteristic curve
250
qv min qv max
140
Max
imum
ope
ratin
g pr
essu
re P
[ba
r]
(ful
ly e
nerg
ized
)
Sett
ing
rang
e
Flow qV [l/min]
Hys
tere
sis/
pres
sure
ris
e Δp
max
< 4
bar
▶ Characteristic curves valid for n1 = 1500 rpm and tfluid = 50 °C.
▶ Pilot fluid consumption: 3 to 4.5 l/min. ▶ Standby standard 14 bar. Other values on request.
▼ Circuit diagram ER71/ER72
SL2
BL
X
L1
Technical data, solenoid ED71 ED72
Voltage 12 V (±20%) 24 V (±20%)
Control current
Start of control at p min 100 mA 50 mA
End of control at p max 1200 mA 600 mA
Limiting current 1.54 A 0.77 A
Nominal resistance (at 20 °C) 5.5 Ω 22.7 Ω
Dither frequency 100 to200 Hz
100 to200 Hz
Actuated time 100% 100%
Type of protection: see connector version page 60
Operating temperature range at valve -20 °C to +115 °C
Bosch Rexroth AG, RE 92703/10.2014
18 A10VO series 52 and 53 | Axial piston variable pumpEP – Electro-proportional control
EP – Electro-proportional control
Electro-proportional control makes a stepless and repro-ducible setting of the pump displacement possible directly via the swashplate. The control force of the control piston is applied by a proportional solenoid. The control is propor-tional to the current (for start of control, see table right).In a depressurized state, the pump is swiveled to its initial position (Vg max) by an adjusting spring. If the operating pressure exceeds 14 bar, the pump will swivel from Vg max to Vg min without control by the solenoid (control current < start of control). With a minimum swivel angle Vg min and de-energized EP solenoids, a minimum pressure of 10 bar must be maintained, or alternatively a minimum amount of 5% of the displacement. A PWM signal is used to control the solenoid.
EP.D: The pressure control regulates the pump displace-ment back to Vg min after the set target pressure has been reached.We recommend the valve with flushing function for the EP.D control variant. Please contact us.A minimum operating pressure of 14 bar is needed for control. The necessary control fluid is taken from the high pressure.
▼ Characteristic curve EP1/2 Hysteresis < 5%
Displacement [%]
Con
trol
cur
rent
I [
mA]
▶ Hysteresis static current-pressure characteristic curve < 3 bar.
▶ Influence of pressure setting on stand-by ± 2 bar.
▼ Circuit diagram EP.D
SL2
BL L1
Technical data, solenoid EP1 EP2
Voltage 12 V (±20%) 24 V (±20%)
Control current
Beginning of control at Vg min 400 mA 200 mA
End of control at Vg max 1200 mA 600 mA
Limiting current 1.54 A 0.77 A
Nominal resistance (at 20 °C) 5.5 Ω 22.7 Ω
Dither frequency 100 to 200 Hz
100 to 200 Hz
Actuated time 100% 100%
Type of protection: see connector version page 60
Operating temperature range at valve -20 °C to +115 °C
Note!The spring return at the controller is not a safety deviceThe controller may block in an undefined position due to contamination (contaminated hydraulic fluid, abrasion or residual contamination from system components). The volume flow of the axial piston unit will then no longer follow the commands of the operator.Check whether your application requires that remedial measures be taken on your machine in order to bring the driven consumer into a safe position (e. g. immediate stop)
0 1.00.5
200
400
Vg min Vg max
600
800
1000
1200
1400
EP1
EP2
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 EK – Electro-proportional control with controller cut-off
19
EK – Electro-proportional control with controller cut-off
Variant EK... is based completely on the variant EP... (see page 18).In addition to the electro-proportional control function, a controller cut-off is integrated in the electric characteris-tic curve. The pump then swivels to Vg max if the pilot signal is lost (e.g., cable break) and then if needed works with the DRF settings if necessary (see page 12). The controller cut-off is only intended for short-term use and not for permanent use if the control signal is lost. If the control signal is lost, the pump swivel times will be increased by the EK valve A PWM signal is used to control the solenoid. A minimum operating pressure of 50 bar is needed for electro-proportional control with controller cut-off. For lower pres-sures, a pilot signal of > 500 mA (EK2) or > 1,000 mA (EK1) is required in order to avoid undesired controller cut-off. The necessary control fluid is taken from the high pressure.The Vg max position is maintained by the force of the adjust-ing spring. To overcome the force of this spring, the sole-noid must be subjected to excessive current (Ires).We recommend the valve with flushing function for the EK.D control variant. Please contact us.Observe the instructions regarding the project design on page 2
▼ Characteristic curve EK1/2 Hysteresis < 5%
Displacement [%]
Con
trol
cur
rent
I [
mA]
▶ Hysteresis static current-pressure characteristic curve < 3 bar.
▶ Influence of pressure setting on stand-by ± 2 bar. ▶ For changes in current, ramp times of > 200 ms must be
observed.
▼ Circuit diagram EK.DF
SL2
BL L1
Technical data, solenoid EK1 EK2
Voltage 12 V (±20%) 24 V (±20%)
Control current
Beginning of control at Vg min 400 mA 200 mA
End of control at Vg max 1200 mA 600 mA
Limiting current 1.54 A 0.77 A
Nominal resistance (at 20 °C) 5.5 Ω 22.7 Ω
Dither frequency 100 to 200 Hz
100 to 200 Hz
Actuated time 100% 100%
Type of protection: see connector version page 60
Operating temperature range at valve -20 °C to +115 °C
EK1 EK2
Imin [mA] 400 200
Imax [mA] 1200 600
Ioff [mA] < 300 < 150
Ires [mA] > 1200 > 600
Note!The spring return at the controller is not a safety deviceThe controller may block in an undefined position due to contamination (contaminated hydraulic fluid, abrasion or residual contamination from system components). The volume flow of the axial piston unit will then no longer follow the commands of the operator.Check whether your application requires that remedial measures be taken on your machine in order to bring the driven consumer into a safe position (e. g. immediate stop)
0 1.00.5
200
400
600
800
1000
1200
1400
Ires
Ires
Ioff
Imin
Imin
Ioff
EK1
EK2
Bosch Rexroth AG, RE 92703/10.2014
20 A10VO series 52 and 53 | Axial piston variable pumpEP(K).DF / EP(K).DS / EP(K) – with pressure and flow control
EP(K).DF / EP(K).DS / EP(K) – with pressure and flow control
A hydraulic pressure flow control is superimposed on the electro-proportional control.The pressure control regulates the pump displacement back to Vg min after the set target pressure has been reached.This function is super-imposed on the EP or EK control, i.e. the control-current dependent function is executed below the target pressure.Setting range from 20 to 250 bar. For the pressure flow control, see page 12.Pressure control has priority over electro-proportional control and flow control.With flow control, the pump flow can be influenced in addition to pressure control. The pump flow is thus equal to the actual amount of hydraulic fluid required by the consumer. This is achieved using the differential pressure at the consumer (e.g. orifice).The EP.DS or EK.DS version has no connection between X and the reservoir (load sensing). Please refer to the notes on page 12.
▼ Circuit diagram EP.D
SL2
BL L1
1 The metering orifice (control block) and the line is not included in the delivery contents.
▼ Circuit diagram EP.DF
SL2
BL L1
X
1
▼ Circuit diagram EP.DS
SL2
BL L1
X
1
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 EP.ED / EK.ED – with electro-hydraulic pressure control
21
EP.ED / EK.ED – with electro-hydraulic pressure control
The ED valve is set to a certain pressure by a specified variable solenoid current.When a change is made at the consumer (load pressure), the position of the control piston will shift.This causes an increase or decrease in the pump swivel angle (flow) in order to maintain the electrically set pres-sure level.The pump thus only delivers as much hydraulic fluid as the consumers can take. The pressure can be set steplessly by the solenoid current.As the solenoid current signal drops towards zero, the pressure will be limited to pmax by an adjustable hydraulic pressure cut-off (negative characteristic curve, e.g. for fan drives ). A PWM signal is used to control the solenoid.For further information and technical data of the solenoids for ED(ER) control please refer to pages 16 to 19.
▼ Circuit diagram EP.ED
SL2
BL L1
X
▼ Circuit diagram EK.ED
SL2
BL L1
X
1 The metering orifice (control block) and the line is not included in the delivery contents.
Bosch Rexroth AG, RE 92703/10.2014
22 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 10
Dimensions, size 10
DR – Pressure control; centering flange SAE version
180148
24
L1
45°
73
L
51 5128.6 28.6
B S
53.5
ø 11
106.4134
45°
956
56
5128.6
5128.6
S B
max. 110
Y
ø 82
.55
-0.0
540
116.4Flange
ISO 3019-1
▼ View Y Valve mounting for clockwise rotation
▼ View Y Valve mounting for counter-clockwise rotation
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 10
23
Dimensions, size 10
DR – Pressure control; centering flange metric version
180148
24
L1
45°
73
L
51 5128.6 28.6
B S
53.5
ø 11
109134
45°
956
56
5128.6
5128.6
S B
max. 110
Y
ø 80
-0.0
460
116.4Flange
ISO 3019-2
▼ View Y Valve mounting for clockwise rotation
▼ View Y Valve mounting for counter-clockwise rotation
Bosch Rexroth AG, RE 92703/10.2014
24 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 10
Dimensions [mm]
▼ Splined shaft 3/4 in (SAE J744) ▼ Splined shaft 5/8 in (SAE J744)
S ‒ 11T 16/32DP1) U ‒ 9T 16/32DP1)
38
14
5
30
21
1/4-
20UN
C-2B
2) 4
)
ø22
31.8
ø22
15.8
23.8
▼ Parallel keyed shaft DIN 6885
P ‒ A6x6x25
ø18
20.5
-0.2
36
2
28 + 0.3
25
-0.0
04+0
.009
Ø22
Ports Standard Size4) pmax abs [bar]5) State8)
B Working port DIN 3852 M27 × 2; 16 deep 315 O
S Suction port DIN 3852 M27 × 2; 16 deep 5 O
L Drain port DIN 38526) M16 × 1.5; 12 deep 2 O7)
L1 Drain port DIN 38526) M16 × 1.5; 12 deep 2 X7)
L Drain port DIN 119266) 9/16-18UNF-2B; 10 deep 2 O7)
L1 Drain port DIN 119266) 9/16-18UNF-2B; 10 deep 2 X7)
X with adapter Control pressure DIN 3852 M14 × 1.5; 12 deep 315 O
X without adapter
Control pressure DIN ISO 228 7/16-20UNF-2B; 11.5 deep 315 O
Centering 3)
R3 15x6.7DIN 332
1) Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Thread according to ASME B1.13) Coupling axially secured, e.g. with a clamp coupling or radially
mounted clamping screw4) Observe the project planning notes on page 64 concerning the
maximum tightening torques.
5) Depending on the application, momentary pressure spikes can occur. Keep this in mind when selecting measuring equipment and fittings
6) The spot face can be deeper than as specified in the standard.7) Depending on the installation position, L or L1 must be connected
(also see installation instructions starting on page 61).8) O = Must be connected (plugged on delivery) X = Plugged (in
normal operation)
Centering 3)
R3 15x6.7DIN 332
Key width 6
25
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 10
Dimensions [mm]
▼ DRG – Pressure control, remotely operated (metric)1) ▼ DFR/DFR1 – Pressure, flow control (metric)1)
180L1
X
117
110
131
L
40X
max. 110
180L1
X
117
110
131
L
40X
max. 110
▼ DRG – Pressure control, remotely operated (SAE)1) ▼ DFR/DFR1 – Pressure, flow control (SAE)1)
179L1
X
102
95
146 40 X
L
179L1
X
102
95
146 40 X
L
1) Valve mounting for clockwise or counter-clockwise rotation see page 11 and 12
Bosch Rexroth AG, RE 92703/10.2014
26 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 18
Dimensions [mm]
Dimensions, size 18
DR – Hydraulic pressure controller; Clockwise rotation, series 53
3332
Ø32
58.7
Ø20
47.6
22.230.2
61.5
61.5
2.545°
45°
11
106.4136
6372
122
24.57.8 10
83156max. 183
83
Ø82
.55
- 0.0
54Ø
82.5
5- 0
.054
00
S B
L
L
L1
X
Ø32
58.7
170143
30.2
S
Y
56.556.5
Ø20
47.6
22.2B
Z
24.57.8 10
83
L
L1
L1
L2
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View X1)
View Y1)
Detail Z
Flange ISO 3019-1
Flange ISO 3019-1
▼ Port plate 11
▼ Port plate 12
27
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 18
Dimensions [mm]
▼ Splined shaft 3/4 in (SAE J744) ▼ Splined shaft 3/4 in (SAE J744)
S ‒ 11T 16/32DP1) R ‒ 11T 16/32DP1)2)
38
14
5
30
21
1/4-
20UN
C-2B
4) 5
)
Ø22
1/4-
20UN
C-2B
4)5)
14
5
38
21
Ø22
▼ Splined shaft 5/8 in (SAE J744) ▼ Parallel keyed shaft DIN 6885
U ‒ 9T 16/32DP1) P ‒ A6x6x25
31.8
ø22
15.8
23.8
ø18
20.5
-0.2
36
2
28 + 0.3
25
-0.0
04+0
.009
Ø22
Ports Standard Size5) pmax abs [bar]6) State11)
B Working port (Standard pressure series)Fastening thread
SAE J5187)
DIN 133/4 inM10 × 1.5; 17 deep
315 O
S Suction port (standard pressure series)Fastening thread
SAE J5187)
DIN 131 1/4 inM10 × 1.5; 17 deep
5 O
L Drain port DIN 119268) 3/4-16UNF-2B; 12 deep 2 O9)
L1, L210) Drain port DIN 119268) 3/4-16UNF-2B; 12 deep 2 X9)
X Control pressure DIN 11926 7/16-20UNF-2A; 11.5 deep 315 O
Usable shaft length
1) Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Splines according to ANSI B92.1a, run out of spline is a deviation from standard.
3) Center bore according to DIN 3324) Thread according to ASME B1.15) Observe the project planning notes on page 64 concerning the
maximum tightening torques.
6) Depending on the application, momentary pressure spikes can occur. Keep this in mind when selecting measuring equipment and fittings
7) Metric fixing thread is a deviation from standard8) The spot face can be deeper than as specified in the standard.9) Depending on the installation position, L, L1 or L2 must be
connected (also see installation instructions starting on page 61).10) Only series 5311) O = Must be connected (plugged on delivery) X = Plugged (in
normal operation)
Centering 3)
R3 15x6.7DIN 332
Centering 3)
R3 15x6.7DIN 332
Key width 6
Bosch Rexroth AG, RE 92703/10.2014
28 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 18
Dimensions [mm]
▼ DRG – Pressure controller, remote controlled, series 53 ▼ EP.D. / EK.D. – Electro-proportional control, series 53
113
106
62
122
max. 183
X
S
L
L2
L1
106
62
L
L1
L2
218.5113
XX
S
122
▼ DRF/DRS – Pressure and flow control, series 53 ▼ EP.ED. / EK.ED. – Electro-prop. control, series 53
113
106
62
122
max. 183
X
S
L
L2
L1
L
L1
L2
220
X
122
110
▼ LA.D. – Pressure, flow and power control, series 53 ▼ ED7. / ER7. – Electro-prop. pressure control, series 53
106
62
113
122
113225
X
S
L
L2
L1
S
1221)
214
L
L1
L2
1) ER7.: 157 mm if using an intermediate plate pressure controller
29
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 28
Dimensions [mm]
Dimensions, size 28
DR – Hydraulic pressure controller; Clockwise rotation, series 522)ø1
01.6
-0.0
540
7.9
73
14.3
max. 209.5
27170
6.3
12
90
123.
5
146172
45°
69X
58.7
30.2
L
L1
L
107
9.5
66
ø20
47.6
33
22.2
33
ø32
S B
S
16030.2
L
L1
6.3
1290
9.5
max. 209.5
ø32 Y
58.7
27
S
ZB
66 66
22.2
47.6
ø20
B
ø101
.6-0
.054
0
1) Dimensions of working ports turned through 180° for counter-clockwise rotation2) Primary dimensions for pump apply to series 52 and 53
Detail Z
View X1)
View Y1)
Flange ISO 3019-1
Flange ISO 3019-1
▼ Port plate 11
▼ Port plate 12
Bosch Rexroth AG, RE 92703/10.2014
30 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 28
Dimensions [mm]
▼ Splined shaft 7/8 in (SAE J744) ▼ Splined shaft 7/8 in (SAE J744)
S ‒ 13T 16/32DP1) R ‒ 13T 16/32DP1)2)
41
165
33.1
25.1
1/4-
20U
NC
-2B
3) 4
)
1/4-
20U
NC
-2B
3)4) 16
41
25
5
Ports Standard Size4) pmax abs [bar]5) State10)
B Working port (Standard pressure series) Fixing thread
SAE J5186)
DIN 133/4 inM10 × 1.5; 17 deep
315 O
S Suction port (standard pressure series)Fastening thread
SAE J5186)
DIN 131 1/4 inM10 × 1.5; 17 deep
5 O
L Drain port ISO 119267) 3/4-16UNF-2B; 12 deep 2 O8)
L1, L29) Drain port ISO 119267) 3/4-16UNF-2B; 12 deep 2 X8)
X Control pressure ISO 11926 7/16-20UNF-2B; 11.5 deep 315 O
1) Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Splines according to ANSI B92.1a, run out of spline is a deviation from standard.
3) Thread according to ASME B1.14) Observe the project planning notes on page 64 concerning the
maximum tightening torques.5) Depending on the application, momentary pressure spikes can occur.
Keep this in mind when selecting measuring equipment and fittings
6) Metric fixing thread is a deviation from standard7) The spot face can be deeper than as specified in the standard.8) Depending on the installation position, L, L1 or L2 must be con-
nected (also see installation instructions starting on page 61).9) Only for series 5310) O = Must be connected (plugged on delivery) X = Plugged
(in normal operation)
Usable shaft length
31
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 28
Dimensions [mm]
▼ DRG – Pressure controller, remote controlled, series 52 ▼ EP.D. / EK.D. – Electro-proportional control, series 53
139.5
L
L1
max. 209.5
S
63
L
123.
5 X
107
114
63
L
L1
L2
224140
XX
S
130
▼ DFR/DFR1 – Pressure and flow control, series 52 ▼ EP.ED. / EK.ED. – Electro-prop. control, series 53
139.5
L
L1
max. 209.5
S
63
L
123.
5 X
107 L
L1
L2
240
X
130
117
▼ LA.D. – Pressure, flow and power control, series 53 ▼ ED7. / ER7. – Electro-prop. Pressure control, series 52
L
L1
L2
231140
X
130
S
63
114
L1
L
S 1301)
X
240
1) ER7.: 159 mm if using an intermediate plate pressure controller
Bosch Rexroth AG, RE 92703/10.2014
32 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 45
Dimensions [mm]
Dimensions, size 45
DR – Hydraulic pressure controller; Clockwise rotation, series 523)Ø
101.
6-0
.054
0Ø
101.
6-0
.054
0
52.4
Ø25
B
26.2
B
S
72
90
2112)
1782)
L
L1
99150.5
131.
5
45°
78
172146
306.3129.5
35.7
max. 220.5
ø38
69.9
S
14.3 77
68.5
BS Z
90 90
Y
max. 220.5
30
189
L
L1
6.312
999.5
38
BSø2
552
.4
30°
ø38
35.726.2
38
69.9
30°
X
1) Dimensions of working ports turned through 180° for counter-clockwise rotation2) For dimensions of working ports S and B for port plate 13, please refer to port plate 12, footnote 2).3) Primary dimensions for pump apply to series 52 and 53
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
▼ Port plate 13 counter-clockwise rotation2)
Flange ISO 3019-1
Flange ISO 3019-1
33
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 45
Dimensions [mm]
▼ Splined shaft 1 in SAE J744 ▼ Splined shaft 1 in SAE J744
S ‒ 15T 16/32DP1) R ‒ 15T 16/32DP1)2)
45.9
165
38
30
1/4-
20U
NC
-2B
3) 4
)
1/4-
20U
NC
-2B
3) 4
) 16
45.9
29.5
5
▼ Splined shaft 7/8 in SAE J744 ▼ Splined shaft 7/8 in SAE J744
U ‒ 13T 16/32DP1) W ‒ 13T 16/32DP1)
41
165
33.1
25.1
1/4-
20U
NC
-2B
3) 4
)
1/4-
20U
NC
-2B
3) 4
) 16
41
25
5
Ports Standard Size4) pmax abs [bar]5) State10)
B Working port (Standard pressure series)Fastening thread
SAE J5186)
DIN 131 inM10 × 1.5; 17 deep
315 O
S Suction port (standard pressure series)Fastening thread
SAE J5186)
DIN 131 1/2 inM12 × 1.75; 20 deep
5 O
L Drain port ISO 119267) 7/8-14UNF-2B; 13 deep 2 O8)
L1, L29) Drain port ISO 119267) 7/8-14UNF-2B; 13 deep 2 X8)
X Control pressure ISO 11926 7/16-20UNF-2A; 11.5 deep 315 O
1) Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Splines according to ANSI B92.1a, run out of spline is a deviation from standard.
3) Thread according to ASME B1.14) Observe the project planning notes on page 64 concerning the
maximum tightening torques.5) Depending on the application, momentary pressure spikes can occur.
Keep this in mind when selecting measuring equipment and fittings
6) Metric fixing thread is a deviation from standard7) The spot face can be deeper than as specified in the standard.8) Depending on the installation position, L, L1 or L2 must be con-
nected (also see installation instructions starting on page 61).9) Only series 5310) O = Must be connected (plugged on delivery) X = Plugged
(in normal operation)
Usable shaft length
Usable shaft length
Bosch Rexroth AG, RE 92703/10.2014
34 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 45
Dimensions [mm]
▼ DRG – Pressure controller, remote controlled, series 52 ▼ EP.D. / EK.D. – Electro-proportional control, series 53
L
L1
150.5
131.
5
max. 220.568
X
S
115
116
35
L
L1
L2
228146 68
XX
132.
5
S
▼ DFR/DFR1 – Pressure and flow control, series 52 ▼ EP.ED. / EK.ED. – Electro-prop. control, series 53
L
L1
150.5
131.
5
max. 220.568
X
S
115
36
119
85
L
L1
L2
246
X
S 133
▼ LA.D. – Pressure, flow and power control, series 53 ▼ ED7. / ER7. – Electro-prop. Pressure control, series 52
116.
4
68
L
L1
L2
235146
X
S
X
133
X
S
1321) L
L1
250
LL
1) ER7.: 167 mm if using an intermediate plate pressure controller
35
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 60
Dimensions [mm]
Dimensions, size 60
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange C series 52
78
42.9
S
L
201.5239.5
Ø50
77.8
B
52.4
26.2
Ø25
6.39.5
45°
Z
X
Y
15
X
117
146172
137
L
L
L1
78.5
40
72 72
14.3
87
BS
Ø10
1.6
-0.0
540
Ø10
1.6
-0.0
540
max. 220.5
33 46
52.4
Ø25
Ø50
77.8
42.9 26.2
S B
9.5
15
X
208
117
max. 220.5
40
BS
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
Flange ISO 3019-1
Flange ISO 3019-1
Bosch Rexroth AG, RE 92703/10.2014
36 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 60
Dimensions [mm]
Dimensions, size 60
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange D series 52
max. 220.5
max. 220.5
72 72
78
B
L
52.4
26.2
Ø25
12.7
Z
X
Y
114.
5
148
137.
4
87
45°
78.5
146114.5
117
40
42.9
S
201.5239.5
Ø50
77.8
15
14.3
BS
X
L
L
L1
Ø25
52.4
208
33
Ø50
77.8
42.9 26.2
S
B
46
12.7
6
Ø12
7
-0.0
630
Ø12
7-0
.063
0
117
40X
15
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
Flange ISO 3019-1
Flange ISO 3019-1
37
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 63
Dimensions [mm]
Dimensions, size 63
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange C series 53
72 72
ZY
X
max. 220.5
111
115.5
39
89
146172
L1L1
L
L2
79
43°
88
45°77
.5
15
9.56.3
BS
14.3
140.
4
239.5
S
42.9
77.8
Ø50
201.5
115.5
B
52.4
26.2
Ø25
Ø10
1.6
-0.0
540
Ø50
77.8
42.9 26.24633
max. 220.5
115.5
BS
BS
Ø25
52.4
208.2
115.5
Ø10
1.6
-0.0
540
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
Flange ISO 3019-1
Flange ISO 3019-1
Bosch Rexroth AG, RE 92703/10.2014
38 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 63
Dimensions [mm]
Dimensions, size 63
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange D series 53
239.5
S
42.9
77.8
Ø50
201.5
B
52.4
26.2
Ø25
72 72
146
151max. 220.5
6.3
146
14
114.5
114.
5
ZY
X
115.5
39
89
L1
L1
L
L2
79
43°
150
88
45°77
.5
12.7
BS
140
111
45° 45°
X
115.5
208
151max. 220.5
15
15
6.3
115.5
39L1
Ø12
7-0
.063
0Ø
127
-0.0
630
12.7X
115.5
Ø25
52.4
S B
4633
Ø5077.8
42.9 26.2
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
Flange ISO 3019-1
Flange ISO 3019-1
39
RE 92703/10.2014, Bosch Rexroth AG
Dimensions [mm] Axial piston variable pump | A10VO series 52 and 53Dimensions, nominal size 60/63
▼ Splined shaft 1 1/4 in SAE J744 ▼ Splined shaft 1 1/4 in SAE J744
S ‒ 14T 12/24DP1) R ‒ 14T 12/24DP1)2)
55.4
195
47.5
39.5
5/16
-18U
NC
-2B
3) 4
)
5/16
-18U
NC
-2B
3) 4
)
19
55.4
38
5
▼ Splined shaft 1 in SAE J744 ▼ Splined shaft 1 in SAE J744
U ‒ 15T 16/32DP1) W ‒ 15T 16/32DP1)
45.9
165
33.1
25
1/4-
20U
NC
-2B
3) 4
)
1/4-
20U
NC
-2B
3) 4
) 16
45.9
29
5
Ports Standard Size4) pmax abs [bar]5) State10)
B Working port (Standard pressure series)Fastening thread
SAE J5186)
DIN 131 inM10 × 1.5; 17 deep
315 O
S Suction port (standard pressure series)Fastening thread
SAE J5186)
DIN 132 inM12 × 1.75; 20 deep
5 O
L Drain port ISO 119267) 7/8-14UNF-2B; 13 deep 2 O8)
L1, L29) Drain port ISO 119267) 7/8-14UNF-2B; 13 deep 2 X8)
X Control pressure ISO 11926 7/16-20UNF-2A; 11.5 deep 315 O
1) Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Splines according to ANSI B92.1a, run out of spline is a deviation from standard.
3) Thread according to ASME B1.14) Observe the project planning notes on page 64 concerning the
maximum tightening torques.5) Depending on the application, momentary pressure spikes can occur.
Keep this in mind when selecting measuring equipment and fittings
6) Metric fixing thread is a deviation from standard7) The spot face can be deeper than as specified in the standard.8) Depending on the installation position, L, L1 or L2 must be con-
nected (also see installation instructions starting on page 61).9) Only series 5310) O = Must be connected (plugged on delivery) X = Plugged
(in normal operation)
Usable shaft length
Usable shaft length
Bosch Rexroth AG, RE 92703/10.2014
40 Dimensions [mm]A10VO series 52 and 53 | Axial piston variable pump Dimensions, nominal sizes 60/63
▼ DRG – Pressure controller, remote controlled, series 52 ▼ EP.D. / EK.D. – Electro-proportional control, series 53
S
150.5
X
137
LL1L1
121
65Xmax. 220.5
151241
125
L1
L
L2
X 35.6
140.
4
X
115.5 64.8
123.
9
S
▼ DFR/DFR1 – Pressure and flow control, series 52 ▼ EP.ED. / EK.ED. – Electro-prop. control, series 53
S
150.5
X
137
LL1L1
121
65Xmax. 220.5
250.5
125
L1
L
L2
36
140.
4
115.5 82
S
X
▼ LA.D. – Pressure, flow and power control, series 53 ▼ ED7. / ER7. – Electro-prop. Pressure control, series 52
L1
L
L2
140
128
24765
S
X
124
X
150 251
1371)
SL
L1
L1
L
1) ER7.: 172 mm if using an intermediate plate pressure controller
41
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 72
Dimensions [mm]
Dimensions, size 72
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange C series 53
72 72
ZY
X
max. 220.5
111
115.5
39
89
146172
L1L1
L
L2
79
43°
88
45°77
.5
15
9.56.3
BS
14.3
140.
4
239.5
S
42.9
77.8
Ø50
201.5
115.5
B
52.4
26.2
Ø25
Ø10
1.6
-0.0
540
Ø50
77.8
42.9 26.24633
max. 220.5
115.5
BS
BS
Ø25
52.4
208.2
115.5
Ø10
1.6
-0.0
540
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
Flange ISO 3019-1
Flange ISO 3019-1
Bosch Rexroth AG, RE 92703/10.2014
42 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 72
Dimensions [mm]
Dimensions, size 72
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange D series 53
239.5
S
42.9
77.8
Ø50
201.5
B
52.4
26.2
Ø25
72 72
146
151max. 220.5
6.3
146
14
114.5
114.
5
ZY
X
115.5
39
89
L1
L1
L
L2
79
43°
150
88
45°77
.5
12.7
BS
140
111
45° 45°
X
115.5
208
151max. 220.5
15
15
6.3
115.5
39L1
Ø12
7-0
.063
0Ø
127
-0.0
630
12.7X
115.5
Ø25
52.4
S B
4633
Ø5077.8
42.9 26.2
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
Flange ISO 3019-1
Flange ISO 3019-1
43
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 72
Dimensions [mm]
Dimensions, size 72
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange R series 53
239.5
S
42.9
77.8
Ø50
201.5
B
52.4
26.2
Ø25
72 72
146
151max. 220.5
6.3
146
14
114.5
114.
5
ZY
X
115.5
39
89
L1
L1
L
L2
79
43°
150
88
45°77
.5
12.7
BS
140
111
45° 45°
X
115.5
208
151max. 220.5
15
15
6.3
115.5
39L1
Ø12
7-0
.063
0Ø
127
-0.0
630
12.7X
115.5
Ø25
52.4
S B
4633
Ø5077.8
42.9 26.2
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
Flange ISO 3019-1
Flange ISO 3019-1
Bosch Rexroth AG, RE 92703/10.2014
44 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 72
Dimensions [mm]
▼ Splined shaft 1 1/4 in SAE J744 ▼ Splined shaft 1 1/4 in SAE J744
S ‒ 14T 12/24DP1) R ‒ 14T 12/24DP1)2)
55.4
195
47.5
39.5
5/16
-18U
NC
-2B
3) 4
)
5/16
-18U
NC
-2B
3) 4
)
19
55.4
38
5
▼ Splined shaft 1 in SAE J744 ▼ Splined shaft 1 in SAE J744
U ‒ 15T 16/32DP1) W ‒ 15T 16/32DP1)
45.9
165
33.1
25
1/4-
20U
NC
-2B
3) 4
)
1/4-
20U
NC
-2B
3) 4
) 16
45.9
29
5
Ports Standard Size4) pmax abs [bar]5) State10)
B Working port (standard pressure series)Fastening thread
SAE J5186)
DIN 131 inM10 × 1.5; 17 deep
315 O
S Suction port (standard pressure series)Fastening thread
SAE J5186)
DIN 132 inM12 × 1.75; 20 deep
5 O
L Drain port ISO 119267) 7/8-14UNF-2B; 13 deep 2 O8)
L1, L29) Drain port ISO 119267) 7/8-14UNF-2B; 13 deep 2 X8)
X Control pressure ISO 11926 7/16-20UNF-2A; 11.5 deep 315 O
1) Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Splines according to ANSI B92.1a, run out of spline is a deviation from standard.
3) Thread according to ASME B1.14) Observe the project planning notes on page 64 concerning the
maximum tightening torques.5) Depending on the application, momentary pressure spikes can occur.
Keep this in mind when selecting measuring equipment and fittings
6) Metric fixing thread is a deviation from standard7) The spot face can be deeper than as specified in the standard.8) Depending on the installation position, L, L1 or L2 must be con-
nected (also see installation instructions starting on page 61).9) Only series 5310) O = Must be connected (plugged on delivery) X = Plugged
(in normal operation)
Usable shaft length
Usable shaft length
45
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 72
Dimensions [mm]
▼ DRG – Pressure controller, remote controlled, series 53 ▼ EP.D. / EK.D. – Electro-proportional control, series 53
max. 220.565
124
140.
5
X
150.5
L
L2
X
S
151241
125
L1
L
L2
X 35.6
140.
4
X
115.5 64.8
123.
9
S
▼ DRF/DRS – Pressure and flow control, series 53 ▼ EP.ED. / EK.ED. – Electro-prop. control, series 53
max. 220.565
124
140.
5
X
150.5
L
L2
X
S
250.5
125
L1
L
L2
36
140.
4
115.5 82
S
X
▼ LA.D. – Pressure, flow and power control, series 53 ▼ ED7. / ER7. – Electro-prop. pressure control, series 53
L1
L
L2
140
128
24765
S
X
124
X
150 250.5
140.
51)
X
L
L2S
1) ER7.: 175.5 mm if using an intermediate plate pressure controller
Bosch Rexroth AG, RE 92703/10.2014
46 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 85
Dimensions [mm]
Dimensions, size 85
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange C series 52
95 85
S
L
50.8235.5
277
Z
X
Y
max. 241.5130
BS
X
Ø63
88.9
31.8
66.7
B
Ø32
S
B
Ø12
7-0
.063
0Ø
127
-0.0
630
66.7
Ø60
88.9
Ø32
50.8 31.850 45
156
max. 242130
X L
L1
245
12.7
20
40
12.7
20
40
181210
45°
95
93.5
8717.5
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
Flange ISO 3019-1
Flange ISO 3019-1
47
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 85
Dimensions [mm]
Dimensions, size 85
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange D series 53
S95 85
66.7
Ø32
31.8B
235
Ø63
88.9
277
50.8
ZY
X
20
36
130
143
max. 251.5
12.7
3612.7
X
BS
245
4
45°
126
114.
5
114.5146
14.3
150
Ø12
7-0
.063
0Ø
127
-0.0
630
101
102.
5
95
130
143
45°
95
4
L
L2
L1
X
max. 251.5
S B
66.7
Ø6088
.9
Ø32
50.8 31.850 45
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
Flange ISO 3019-1
Flange ISO 3019-1
Bosch Rexroth AG, RE 92703/10.2014
48 A10VO series 52 and 53 | Axial piston variable pumpDimensions, size 85
Dimensions [mm]
▼ Splined shaft 1 1/2 in SAE J744 ▼ Splined shaft 1 1/4 in SAE J744
S ‒ 17T 12/24DP1) U ‒ 14T 12/24DP1)
61.9
285
54
43.5
7/16
-14U
NC
-2B
3) 4
)
55.4
195
47.5
35
5/16
-18U
NC
-2B
3) 4
)
▼ Splined shaft 1 1/4 in SAE J744
W ‒ 14T 12/24DP1)
5/16
-18U
NC
-2B
3) 4
)
19
55.4
33
5
Ports Standard Size4) pmax abs [bar]5) State10)
B Working port (high-pressure line)Fastening thread
SAE J5186)
DIN 131 1/4 inM14 × 2; 19 deep
315 O
S Suction port (standard pressure series)Fastening thread
SAE J5186)
DIN 132 1/2 inM12 × 1.75; 17 deep
5 O
L Drain port ISO 119267) 1 1/16-12UNF-2B; 15 deep 2 O8)
L1, L29) Drain port ISO 119267) 1 1/16-12UNF-2B; 15 deep 2 X8)
X Control pressure ISO 11926 7/16-20UNF-2A; 11.5 deep 315 O
1) Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Splines according to ANSI B92.1a, run out of spline is a deviation from standard.
3) Thread according to ASME B1.14) Observe the project planning notes on page 64 concerning the
maximum tightening torques.5) Depending on the application, momentary pressure spikes can occur.
Keep this in mind when selecting measuring equipment and fittings
6) Metric fixing thread is a deviation from standard7) The spot face can be deeper than as specified in the standard.8) Depending on the installation position, L, L1 or L2 must be con-
nected (also see installation instructions starting on page 61).9) Only series 5310) O = Must be connected (plugged on delivery) X = Plugged
(in normal operation)
Usable shaft length
49
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions, size 85
Dimensions [mm]
▼ DRG – Pressure controller, remote controlled, series 52 ▼ EP.D. / EK.D. – Electro-proportional control, series 53
139.
5
X 74
156
L
L1
S
max. 241.5171.5
X
36X
142
150
133
74181.5267
L
L2
L1X
S
▼ DRF/DRS – Pressure and flow control, series 52 ▼ EP.ED. / EK.ED. – Electro-prop. control, series 53
139.
5
X 74
156
L
L1
S
max. 241.5171.5
X
S
133
74181.5281
X
150
L
L2
L1X
▼ LA.D. – Pressure, flow and power control, series 53 ▼ ED7. / ER7. – Electro-prop. Pressure control, series 52
X
S
145
149.
9
133.
4
74181.5271
L
L2
L1X
19.455
1561)
271.4
XL1
L
S
1) ER7.: 191 mm when using a sandwich plate pressure reducing valve
Bosch Rexroth AG, RE 92703/10.2014
50 A10VO series 52 and 53 | Axial piston variable pumpDimensions size 100
Dimensions [mm]
Dimensions size 100
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange C series 53
S95 85
66.7
Ø32
31.8B
235
Ø63
88.9
277
50.8
ZY
X
20
36
130
143max. 251.5
12.7
3612.7
X
BS
245
Ø12
7-0
.063
0Ø
127
-0.0
630
130
143
X
max. 251.5
S B66
.7
Ø6088
.9
Ø32
50.8 31.850 45
4
45°
150
101
102.
5
95
181210
45°
95
4
17.5
LL
L
L2
L1L1
L1
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
Flange ISO 3019-1
Flange ISO 3019-1
51
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions size 100
Dimensions [mm]
Dimensions size 100
DR – Hydraulic pressure controller; Clockwise rotation, mounting flange D series 53
S95 85
66.7
Ø32
31.8B
235
Ø63
88.9
277
50.8
ZY
X
20
36
130
143
max. 251.5
12.7
3612.7
X
BS
245
4
45°
126
114.
5
114.5146
14.3
150
Ø12
7-0
.063
0Ø
127
-0.0
630
101
102.
5
95
130
143
45°
95
4
LL1
L
L1
L
L2
L1
X
max. 251.5
S B
66.7
Ø6088
.9
Ø32
50.8 31.850 45
1) Dimensions of working ports turned through 180° for counter-clockwise rotation
View Y1)
View X1)
Detail Z
▼ Port plate 11
▼ Port plate 12
Flange ISO 3019-1
Flange ISO 3019-1
Bosch Rexroth AG, RE 92703/10.2014
52 A10VO series 52 and 53 | Axial piston variable pumpDimensions size 100
Dimensions [mm]
▼ Splined shaft 1 1/2 in SAE J744 ▼ Splined shaft 1 1/4 in SAE J744
S ‒ 17T 12/24DP1) U ‒ 14T 12/24DP1)
61.9
285
54
43.5
7/16
-14U
NC
-2B
3) 4
)
55.4
195
47.5
35
5/16
-18U
NC
-2B
3) 4
)
▼ Splined shaft 1 1/4 in SAE J744
W ‒ 14T 12/24DP1)
5/16
-18U
NC
-2B
3) 4
)
19
55.4
33
5
Ports Standard Size4) pmax abs [bar]5) Status10)
B Working port (high-pressure line)Fastening thread
SAE J5186)
DIN 131 1/4 inM14 × 2; 19 deep
315 O
S Suction port (standard pressure series)Fastening thread
SAE J5186)
DIN 132 1/2 inM12 × 1.75; 17 deep
5 O
L Drain port ISO 119267) 1 1/16-12UNF-2B; 15 deep 2 O8)
L1, L29) Drain port ISO 119267) 1 1/16-12UNF-2B; 15 deep 2 X8)
X Control pressure ISO 11926 7/16-20UNF-2A; 11.5 deep 315 O
1) Involute spline according to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Splines according to ANSI B92.1a, run out of spline is a deviation from standard.
3) Thread according to ASME B1.14) Observe the project planning notes on page 64 concerning the
maximum tightening torques.5) Depending on the application, momentary pressure spikes can occur.
Keep this in mind when selecting measuring equipment and fittings
6) Metric fixing thread is a deviation from standard7) The spot face can be deeper than as specified in the standard.8) Depending on the installation position, L, L1 or L2 must be con-
nected (also see installation instructions starting on page 61).9) Only series 5310) O = Must be connected (plugged on delivery) X = Plugged
(in normal operation)
Usable shaft length
53
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions size 100
Dimensions [mm]
▼ DRG – Pressure controller, remote controlled, series 53 ▼ EP.D. / EK.D. – Electro-proportional control, series 53
S
133
74181.5max. 251.5
X
X
150
L
L2
L1
36X
142
150
133
74181.5267
L
L2
L1X
S
▼ DRF/DRS – Pressure and flow control, series 53 ▼ EP.ED. / EK.ED. – Electro-prop. control, series 53
S
133
74181.5max. 251.5
X
X
150
L
L2
L1
S
133
74181.5281
X
150
L
L2
L1X
▼ LA.D. – Pressure, flow and power control, series 53 ▼ ED7. / ER7. – Electro-prop. pressure control, series 53
X
S
145
149.
9
133.
4
74181.5271
L
L2
L1X
S
272
X
1561) L
L2
L1
1) ER7.: 191 mm when using a sandwich plate pressure reducing valve
Bosch Rexroth AG, RE 92703/10.2014
54 A10VO series 52 and 53 | Axial piston variable pumpDimensions through drive
Dimensions [mm]
Dimensions through drive
Flange ISO 3019-1 (SAE) Hub for splined shaft1) Availability over sizes Code
Diameter Attachment2) Diameter 18 28 45 60/63 72 85 100
82-2 (A) 5/8 in 9T 16/32DP ● ● ● ● ● ● ● K013/4 in 11T 16/32DP ● ● ● ● ● ● ● K52
● = Available ○ = On request
▼ 82-2
A4
A B
45°
106.5
A3
A2
10
ø82.
55+0
.050
+0.0
20
A4
45°
ø 106.5
A3
10
ø82.
55+0
.050
+0.0
20
A2
A B
K01(SAE J744 16-4 (A))
NG A1 A2 A3 A43) K52(SAE J744 19-4 (A-B))
NG A1 A2 A3 A43)
18 182 9.3 43.3 M10×1.5;14.5 deep
18 182 39 18.8 M10×1.5;14.5 deep
28 204 9.9 47 M10×1.5;16 deep
28 204 39.3 18.8 M10×1.5;16 deep
45 229 10.7 53 M10×1.5;16 deep
45 229 39.4 18.9 M10×1.5;16 deep
6063
255 9.5 59 M10×1.5;16 deep
6063
255 39.4 18.9 M10×1.5;16 deep
72 255 9.5 59 M10×1.5;16 deep
72 255 39.4 18.9 M10×1.5;16 deep
85 302 13.4 68 M10×1.5;20 deep
85 302 44.1 23.6 M10×1.5;20 deep
100 302 13.4 68 M10×1.5;20 deep
100 302 44.1 23.6 M10×1.5;20 deep
1) According to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Mounting drillings pattern viewed from through drive with control at top
3) Thread according to DIN 13, observe the project planning notes on page 64 for the maximum tightening torques.
A1 (to mounting flange)A1 (to mounting flange)
Omitted for NG 28 Omitted for NG 28
Omitted for NG 28 Omitted for NG 28
Section A-B Section A-B
55
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions through drive
Dimensions [mm]
1) According to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Mounting drillings pattern viewed from through drive with control at top
3) Thread according to DIN 13, observe the project planning notes on page 64 for the maximum tightening torques.
Flange ISO 3019-1 (SAE) Hub for splined shaft1) Availability over sizes Code
Diameter Attachment2) Diameter 18 28 45 60/63 72 85 100
101-2 (B) 7/8 in 13T 16/32DP – ● ● ● ● ● ● K681 in 15T 16/32DP – – ● ● ● ● ● K04
● = Available ○ = On request
▼ 101-2
A4
45°
146
A3
10
ø101
.6+0
.050
+0.0
20
A2
A B
A4
A B
45°
146
A3
10
ø101
.6+0
.050
+0.0
20
A2
K68(SAE J744 22-4 (B))
NG A1 A2 A3 A43) K04(SAE J744 25-4 (B-B))
NG A1 A2 A3 A43)
28 204 42.3 17.8 M12×1.75;18 deep
45 229 47.9 18.9 M12×1.75;18 deep
45 229 42.4 17.9 M12×1.75;18 deep
6063
255 47.4 18.4 M12×1.75;18 deep
6063
255 42.4 17.9 M12×1.75;18 deep
72 255 47.4 18.4 M12×1.75;18 deep
72 255 42.4 17.9 M12×1.75;18 deep
85 302 51.2 22.2 M12×1.75;20 deep
85 302 46.5 22 M12×1.75;20 deep
100 302 51.2 22.2 M12×1.75;20 deep
100 302 46.5 22 M12×1.75;20 deep
A1 (to mounting flange) A1 (to mounting flange)
Omitted for NG 28, 45 Omitted for NG 45
Omitted for NG 45Omitted for NG 28, 45
Section A-B Section A-B
Bosch Rexroth AG, RE 92703/10.2014
56 A10VO series 52 and 53 | Axial piston variable pumpDimensions through drive
Dimensions [mm]
1) According to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Mounting drillings pattern viewed from through drive with control at top
3) Thread according to DIN 13, observe the project planning notes on page 64 for the maximum tightening torques.
Flange ISO 3019-1 (SAE) Hub for splined shaft1) Availability over sizes Code
Diameter Attachment2) Diameter 18 28 45 60/63 72 85 100
127-4 (C) 1 1/4 in 14T 12/24DP – – – ● ● ● ● K151 1/2 in 17T 12/24DP – – – – – ● ● K16
● = Available ○ = On request
▼ 127-4
ø127
+0.0
50+0
.020
B
A
114.
5
114.5 A4 13
A2
A3
ø127
+0.0
50+0
.020
B
A
114.
5
114.5 A4 13.4
A2
A3
K15(SAE J744 32-4 (C))
NG A1 A2 A3 A43) K16(SAE J744 32-4 (C))
NG A1 A2 A3 A43)
6063
255 8 59 M12×1.75;16 deep
85 301.5 13 67.9 M12×1.75;through
72 255 8 59 M12×1.75;16 deep
100 301.5 13 67.9 M12×1.75;through
85 301.5 13 67.9 M12×1.75;through
100 301.5 13 67.9 M12×1.75;through
A1 (to mounting flange) A1 (to mounting flange)
Section A-B Section A-B
57
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Dimensions through drive
Dimensions [mm]
1) According to ANSI B92.1a, 30° pressure angle, flat root, side fit, tolerance class 5
2) Mounting drillings pattern viewed from through drive with control at top
3) Thread according to DIN 13, observe the project planning notes on page 64 for the maximum tightening torques.
Flange ISO 3019-1 (SAE) Hub for splined shaft1) Availability over sizes Code
Diameter Attachment2) Diameter 18 28 45 60/63 72 85 100
127-2 (B) 1 1/4 in 14T 12/24DP – – – – – ● ● K071 1/2 in 17T 12/24DP – – – – – ● ● K24
● = Available ○ = On request
▼ 127-2
13B
45°
Ø12
7+0
.050
+0.0
20
AA3
A2
A4
Ø181
A4
A
B
45°
ø181
A3
A2
13
ø127
+0.0
50+0
.020
K07(SAE J744 32-4 (C))
NG A1 A2 A3 A43) K24(SAE J744 38-4 (C-C))
NG A1 A2 A3 A43)
85 301.5 13 67.9 M12×1.75;through
85 302 8 68 M16×2;24 deep
100 301.5 13 67.9 M12×1.75;through
100 302 8 68 M16×2;24 deep
A1 (to mounting flange) A1 (to mounting flange)
Section A-B Section A-B
Bosch Rexroth AG, RE 92703/10.2014
58 A10VO series 52 and 53 | Axial piston variable pumpOverview of attachment options
Dimensions [mm]
Overview of attachment options
Through drive Attachment options of 2nd pump
Flange ISO 3019-1
Hub for splined shaft
Short des.
A10V(S)O/5xNG (shaft)
A10VO/31 NG (shaft)
A1VO/10NG (shaft)
External gear pump
82-2 (A) 5/8 in K01 10 (U) 18 (U) 18 (S2) Series F3/4 in K52 10 (U)
18 (U)18 (S, R)
18 (S, R) 18 (S3)
101-2 (B) 7/8 in K68 28 (S,R)45 (U, W)1)
28 (S,R)45 (U,W)
35 (S4) Series N/G
1 in K04 45 (S,R)60, 63 (U, W)2)
72 (U, W)2)
45 (S,R) 35 (S5) –
127-4 (C) 1 1/4 in K15 60, 63 (S, R)72 (S,R)
– – –
1 1/2 in K16 85 (S)100 (S)
– – –
127-2 (C) 1 1/4 in K07 85 (U,W)100 (U, W)
71 (S,R) – PGH5
1 1/2 in K24 85 (S)100 (S)
– – –
1) Not for NG28 with K682) Not for NG28 with K04
59
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Combination pumps A10VO + A10VO
Dimensions [mm]
Combination pumps A10VO + A10VO
Through the use of combination pumps, it is possible to have independent circuits without the need to fit splitter gearboxes. When ordering combination pumps, the type designations of the 1st and 2nd pump must be linked with a “+” sign.Order example:A10VO85DRS/53R-VSC12K04+A10VO45DRF/53R-VSC11N00It is permissible to use a combination of two single pumps of the same nominal size (tandem pump) considering a dynamic mass acceleration of maximum 10 g (= 98.1 m/s2) without additional support brackets. For combination pumps consisting of more than two pumps, the mounting flange must be rated for the permis-sible mass torque (please consult us).
Permissible mass moment of inertia
NG 10 18 28 45 60/63 72 85 100
static Tm Nm – – 890 900 1370 1370 3080 3080
dynamic at 10 g (98.1 m/s2) Tm Nm – – 89 90 137 137 308 308
Weight with through-drive plateWeight without through-drive plate (e.g. 2nd pump)
m kg –8
1311.5
1815
2418
2822
2822
4536
4536
Distance, center of gravity without through drive l1 mm – 78 85 96 105 105 122 122
Distance, center of gravity with through drive l1 mm – 87 99 115 127 127 150 150
l1l2
m2m1
m1, m2, m3 Weight of pump [kg]
l1, l2, l3 Distance, center of gravity
[mm]
Tm = (m1 × l1 + m2 × l2 + m3 × l3) ×1
[Nm]102
Bosch Rexroth AG, RE 92703/10.2014
60 A10VO series 52 and 53 | Axial piston variable pumpConnector for solenoids
Dimensions [mm]
1) Power outlets for 2 valves, can be actuated separately
Connector for solenoids
DEUTSCH DT04-2P-EP04Molded connector, 2-pin, without bidirectional suppressor diode The following type of protection is provided with installed mating connector:
▶ IP67 (DIN/EN 60529) and ▶ IP69K (DIN 40050-9)
▼ Circuit diagram symbol
▼ Mating connector DEUTSCH DT06-2S-EP04
Consisting of DT designation
1 case DT06-2S-EP04
1 wedge W2S
2 sockets 0462-201-16141
The mating connector is not included in the delivery contents.This can be supplied by Bosch Rexroth on request (material number R902601804).
Electronic controls
Control Electronics function electronics Further information
Electric pressure control Controlled power outlet RA analog 95230
RC2-2/211) digital 95201
36.7
(2)(1)
36.7
68.5
ø37
50
Changing plug positionIf necessary, you can change the position of the connector by turning the solenoid.To do this, proceed as follows:
▶ Loosen the mounting nut (1) of the solenoid. To do this, turn the mounting nut (1) one turn counter-clockwise.
▶ Turn the solenoid body (2) to the desired orientation. ▶ Retighten the fixing nut.
Tightening torque: 5+1 Nm. (WAF 26, 12-sided DIN 3124)
On delivery, the position of the connector may differ from that shown in the brochure or drawing.
RE 92703/10.2014, Bosch Rexroth AG
Axial piston variable pump | A10VO series 52 and 53 Installation instructions
61
1) Because complete air bleeding and filling are not possible in this position, the pump should be air bled and filled in a horizontal po-sition before installation.
2) For NG10 and NG28 series 52, L1 is opposite, L must then be con-nected if necessary.
3) Only series 53
Installation instructions
GeneralThe axial piston unit must be filled with hydraulic fluid and air bled during commissioning and operation. This must also be observed following a longer standstill as the axial piston unit may drain back to the reservoir via the hydraulic lines.Particularly with the “drive shaft up/down” installation position, filling and air bleeding must be carried out com-pletely as there is, for example, a danger of dry running.The case drain fluid in the pump housing must be directed to the reservoir via the highest available drain port (L, L1
2), L23 )).
For combinations of multiple units, the case drain fluid must be drained off at each pump. If a shared reservoir line is used for this purpose, make sure that the case pressure in each pump is not exceeded. In the event of pressure differences at the drain ports of the units, the shared drain line must be changed so that the minimum permissible case pressure of all connected units is not exceeded in any situation. If this is not possible, separate drain lines must be laid if necessary.To achieve favorable noise values, decouple all connecting lines using elastic elements and avoid above-reservoir installation. In all operating conditions, the suction line and drain line must flow into the reservoir below the minimum fluid level. The permissible suction height hS results from the overall loss of pressure. However, it must not be higher than hS max = 800 mm. The minimum suction pressure at port S must also not fall below 0.8 bar absolute during operation and during cold start.When designing the reservoir, ensure adequate distance between the suction line and the case drain line. This pre-vents the heated, return flow from being drawn directly back into the suction line.NoteIn certain installation positions, an infl uence on the control characteristics can be expected. Gravity, dead weight and case pressure can cause minor shifts in con-trol characteristic curves and changes in response time.
For key, see page 63.
Installation position See the following examples 1 to 12.Further installation positions are available upon request.Recommended installation position: 1 and 3
Below-tank installation (standard)Below-tank installation means the axial piston unit is installed outside of the reservoir below the minimum fluid level.
Installation position Air bleeding Filling
12)
LL1
S
X
ht min SB
F
h min
F S + L or L1
21)
X
SB
F
L
L1
S
ht min
h min
F S + L1
3 3)
L
L2
L1
S
SB
Fht min
h min
F S + L or L1
4
SB
F
LL1
S
ht min
h min
F S + L or L1
Bosch Rexroth AG, RE 92703/10.2014
62 A10VO series 52 and 53 | Axial piston variable pumpConnector for solenoids
Dimensions [mm]
1) Because complete air bleeding and filling are not possible in this position, the pump should be air bled and filled in a horizontal po-sition before installation.
2) For NG10 and NG28 series 52, L1 is opposite, L must then be con-nected if necessary.
3) Only series 53
Above-reservoir installationAbove-reservoir installation means the axial piston unit is installed above the minimum fluid level of the reservoir. To prevent the axial piston unit from draining in position 6, the height difference hES min must be at least 25 mm. Observe the maximum permissible suction height hS max = 800 mm.
Installation position Air bleeding Filling
52)
X
LL1
S
F
SB
hs max
ht minh min
F L1 or L
61)2)
SB
S
F
LL1
hs max
ht minh min
hES min
X
F L1
73)
L
L2
SL1
F
SB
hs max
ht minh min
F L2
81)
SB
SF
LL1
hs max
ht minh min
F S or L
A check valve in the case drain line is only permissible in individual cases. Consult us for approval.
For key, see page 63.
RE 92703/10.2014, Bosch Rexroth AG
63
1) Because complete air bleeding and filling are not possible in this position, the pump should be air bled and filled in a horizontal po-sition before installation.
2) For NG10 and NG28 series 52, L1 is opposite, L must then be con-nected if necessary.
3) Only series 53
Axial piston variable pump | A10VO series 52 and 53
Reservoir installationInside-reservoir installation is when the axial piston unit is installed in the reservoir below the minimum fluid level. The axial piston unit is completely below the hydraulic fluid.If the minimum fluid level is equal to or below the upper edge of the pump, see chapter “Above-reservoir installation”.Axial piston units with electrical components (e.g., electric control, sensors) may not be installed in a reservoir below the fluid level.
Installation position Air bleeding Filling
92)
LL1
S
h min
SB h t min
X
Via the highest available port L
Automatically via the open port L or L1 due to the position under the hydraulic fluid level
10
L
L1
S
SB
h min
h t min
X
Via the highest available port L1
Automatically via the open port L, L1 or S due to the position under the hydraulic fluid level
113)
L
L2
SSB
h min
h t min
12
LL1
S SB
h min
h t min
Via the highest available port L
Automatically via the open port L, L1 or S due to the posi-tion under the hydraulic fluid level
Key and assembly note
Legend
F Filling / air bleeding
S Suction port
L; L1 Reservoir port
SB Baffle (baffle plate)
ht min Minimum required immersion depth (200 mm)
hmin Minimum required distance to reservoir bottom (100 mm)
hES min Minimum necessary height needed to protect the axial piston unit from draining (25 mm).
hS max Maximum permissible suction height (800 mm)
64
Bosch Rexroth AG, RE 92703/10.2014
A10VO series 52 and 53 | Axial piston variable pumpProject planning notes
Bosch Rexroth AGMobile ApplicationsAn den Kelterwiesen 1472160 Horb a.N., GermanyTel. +49 7451 [email protected]
© This document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth AG. It may not be reproduced or given to third parties without its consent. The data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. The information provided does not release the user from the obligation of independent judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.
Project planning notes
▶ The A10VO pump is designed to be used in open circuits. ▶ Project planning, installation and commissioning of the
axial piston units requires the involvement of skilled personnel.
▶ Before using the axial piston unit, please read the core-sponding instruction manual thoroughly and completely. If necessary, request these from Bosch Rexroth.
▶ Before finalizing your design, request a binding installa-tion drawing.
▶ The data and notes contained herein must be adhered to. ▶ Pressure controllers are not backups against pressure
overload. A separate pressure relief valve is to be pro-vided in the hydraulic system.
▶ Depending on the operating condition of the axial piston unit (operating pressure, fluid temperature), the charac-teristic curve may shift.
▶ Not all versions of the product are approved for use in a safety function pursuant to ISO 13849. Please consult the responsible contact person at Bosch Rexroth if you require reliability parameters (e.g. MTTFd) for functional safety.
▶ Working ports: – The ports and fastening threads are designed for the
specified peak pressure. The machine or system manufacturer must ensure that the connecting ele-ments and lines correspond to the specified operat-ing conditions (pressure, flow, hydraulic fluid, tem-perature) with the necessary safety factors.
– The service and function ports can only be used to accommodate hydraulic lines.
Safety instructions
▶ During and shortly after operation, there is a risk of burns on the axial piston unit and especially on the solenoids. Take appropriate safety measures (e.g., by wearing protective clothing).
▶ Moving parts in control equipment (e.g. valve spools) can, under certain circumstances, get blocked in posi-tion as a result of contamination (e.g. impure hydraulic fluid, abrasion, or residual dirt from components). As a result, the flow of hydraulic fluid 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 filtering) cannot rule out errors, but can only help mini-mize risks. The machine/system manufacturer must test whether remedial measures are needed on the machine for the application concerned in order to set the con-sumer being driven to a safe position (e.g. safe stop) and if necessary to ensure it is properly implemented.