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Brueninghaus Hydromatik Rexroth A4VG Pump


Hydraulic Piston Pump Model: A4VG40, A4VG56, A4VG71, A4VG90, A4VG125, A4VG180, A4VG250    
Nominal pressure 400 bar  
Peak pressure 450  
Control device: NV, HD3, HW, DG, DA1, DA2, EP3, EP4, EZ1, EZ2, etc.

A4VG Pump A4VG Pump

Features and Benefits
The A4VG axial piston variable pump in swash plate design for hydrostatic closed circuit transmissions.
Flow is proportional to drive peed and displacement and is infinitely variable.  
Output flow increases with the swivel angle of the wash plate from 0 to its maximum value.  
Flow direction change smoothly when the wash plate is moved through the neutral position.  
A wide range of highly adaptable control devices is available for different control and regulating functions.  
The pump is equipped with two pressure-relief valves on the high pressure ports to protect the hydrostatic transmission (pump and motor) from overload.  
The high-pressure relief valves also function as boost valves. 
The maximum boost pressure is limited by a built-in boost pressure relief valve. 
The integral pressure cut-off is standard.    
   
A4VG Pump Technical Data  
Table of values (theoretical values)   


Rexroth A4VG pump

A4VG40

A4VG56

A4VG71

A4VG90

A4VG125

A4VG180

A4VG250

Displacement    

Vg max

cm3

40

56

71

90

125

180

250

boost pump (20 bar)

Vgp

cm3

8.6

11.6

19.6

19.6

28.3

39.8

52.5

Speed   

conti.  

 rpm

4000

3600

3300

3050

2850

2500

2400

limited maximum

limited

rpm

4200

3900

3600

3300

3250

2900

2600

Intermittent max.

Min.

rpm

5000

4500

4100

3800

3450

3000

2700

Nmin

rpm

500

500

500

500

500

500

500

Flow  

l/min

160

202

234

275

356

450

600

Power

400 bar

kW

107

134

156

183

237

300

400

Torque  

400 bar

Nm

255

356

451

572

795

1144

1590

100 bar

Nm

63.5

89

112.8

143

198.8

286

398

Moment of inertia

JGR

kgm2

0.0038

0.0066

0.0097

0.0149

0.0232

0.0444

0.0983

Angular acceleration

α

rad/s2

30000

24000

21000

18000

14000

11000

6700

Filling capacity

V

L

1.1

1.5

1.3

1.5

2.1

3.1

6.3

Weight approx.

m

kg

31

38

50

60

80

101

156

Control units:
NV – version without control unit 
The mounting surface for the control unit is machined and is sealed with the standard seal for control units and a cover plate. This version is ready for retrofitting to control units (HD, HW, EP, EZ). When used directly for "DA" control and in combinations with "DA" control, the appropriate adjustments must be made to the spring assembly of the control cylinder and control plate.
DA –Hydraulic Control, Speed Related
The DA control is an engine speed-dependent or automotive, type control system. The built-in DA regulating cartridge generates a pilot pressure that is proportional to pump (engine) drive speed. This pilot pressure is directed to the positioning cylinder of the pump by a solenoid actuated 4/3 way directional valve. The hydraulic piston pump displacement is infinitely variable in each direction of flow, and is influenced by both pump drive speed and discharge pressure. Increasing pump drive speed generates a higher pilot pressure from the DA cartridge, with a subsequent increase in pump flow and/or pressure.
Dependent on the selected pump operating characteristics, increasing system pressure (i.e. machine load) causes the pump to swivel back towards a smaller displacement. Engine overload (anti-stall) protection is achieved by the combination of this pressure-related pump de-stroking, and the reduction of pilot pressure as the engine speed drops.
Any additional power requirement, such as implement hydraulic, may result in further engine pull down.
These cause a further reduction in pilot pressure and therefore pump displacement. Automatic power division and full utilization of available power is thus achieved for both the vehicle transmission and the implement hydraulics, with priority given to the implement hydraulics. To provide controllable reduced vehicle speed operation when high engine speeds are required for fast implement hydraulics, various inching options are available. The DA regulating cartridge can also be used in pumps with conventional control devices, such as EP, HW or HD, to provide an engine anti-stall function, or as a combination of automotive and displacement control functions.
EP - Electric Control, With Proportional Solenoid
The electrical energy is converted to a force acting on the control spool. The spool then directs control oil in and out of the stroking piston to stroke the pump as required. A feedback lever, connected to the stroking piston, maintains the pump flow for any given current within the control range.
HD – proportional control, hydraulic, pilot-pressure related  

The pilot signal, which originates from an external, remote source, is pressure only. Flow is negligible as the pilot signal is only acting on the spool of the control valve. This spool then directs control oil into and out of the stroking cylinder to adjust pump displacement as required. A feedback lever, connected to the stroking piston, maintains the pump flow for any given pilot signal.
DG – hydraulic control, direct operated
The stroke cylinder of the pump is directly supplied with control pressure by switching a pilot pressure on or off at ports X1 or X2. In this way, the wash plate and thus the displacement can be adjusted between Vg = 0 and Vg max. A different flow direction is associated with each port.
HW –Hydraulic Control, Mechanical Servo
A feedback lever, connected to the stroking piston, maintains the piston pump flow for any given position of the control lever between 0° and 29°. The switch contact in the neutral position switch is closed when the control lever on the HW control unit is in its neutral position. The switch opens if the control lever is moved out of neutral in either direction. The neutral position switch provides a safety function for drive units that require zero flow under certain operating conditions. (e.g. starting diesel engines).
EZ –Electric Two-Point Control, With Switching Solenoid
By energizing or de-energizing a control current to either switching solenoid a or b, the stroke cylinders of the pump are supplied with control pressure by the EZ control unit. In this way, the swash plate and thus the displacement is switchable without intermediate settings from Vg = 0 to Vg max. Each direction of through put flow is assigned to a solenoid.
Details regarding the choice of hydraulic fluid     
The correct choice of hydraulic fluid requires knowledge of the operating temperature in relation to the ambient temperature: in a closed circuit the circuit temperature. The hydraulic fluid should be chosen so that the operating viscosity in the operating temperature range is within the optimum range (νopt) - the shaded area of the selection diagram. We recommended that the higher viscosity class be selected in each case. Example: At an ambient temperature of X °F (X °C) an operating temperature of 140 °F (60 °C) is set in the circuit. In the optimum operating viscosity range (νopt; shaded area) this corresponds to the viscosity classes VG 46 or VG 68; to be selected: VG 68. Please note: The case drain temperature, which is affected by pressure and speed, is always higher than the circuit temperature.
Hydraulic fluid   
Before starting project planning, please refer to our data sheets RE 90220 (mineral oil), RE 90221 (environmentally acceptable hydraulic fluids) and RE 90223 (HF hydraulic fluids) for detailed information regarding the choice of hydraulic fluid and application conditions. The variable piston pump A4VG is unsuitable for operation with HFA, HFB and HFC. If HFD or environmentally acceptable hydraulic fluids are being used, the limitations regarding technical data and seals mentioned in RE 90221 and RE 90223 must be observed. When ordering, please indicate the used hydraulic fluid.
Limits of viscosity range  
The maximum hydraulic fluid temperature of 115 °C must not be exceeded locally either (e.g. in the bearing area).
The temperature in the bearing area is - depending on pressure and speed - up to 5 K higher than the average case drain temperature.

Rexroth A4VG pump part number and model

R902063240

A4VG125HWD3L/32R-NZF02F071K

R902131523

A4VG71DA1D8/32R-NSF02F021BP

R902072787

A4VG28DGDT1/32R-NSC10F045S

R902131609

A4VG125EP4DT1/32R-NZF02F001BP

R902074032

A4VG90HWDT1/32L-NZF02F001S

R902131820

A4VG250HD3D1/32R-NZD10F011D

R902080089

A4VG56HWD2/32R-NZC02F003S

R902131969

A4VG56EP4D1/32L-NAC02F075SP

R902081217

A4VG180NVDT1/32R-NZD02F021S

R902133053

A4VG125HD3DMT1/32R-NZF02F001D

R902085521

A4VG71DA2D7/32R-NZF02F021SP

R902133113

A4VG125EP3DM1/32R-NAF02F071DP

R902085522

A4VG125DA2D7/32R-NZF02F021SP

R902133354

A4VG125HD3D1/32R-NSF02F021D

R902085703

A4VG71HWD2/32R-NZF02F071P

R902134324

A4VG250HD3D1/32L-NSD10F041D

R902085891

A4VG71HWDT1/32R-NAF02K041E

R902134481

AA4VG140EP4D1/32R-NXF63F071DP

R902088221

A4VG90HWD2/32R-NZF02F071S

R902136132

A4VG125HD3D2/32R-NAF02F021S

R902089470

A4VG71DA1D2/32R-NSF02F011PP

R902136173

A4VG71DA1D2/32R-NZF02F021SQ

R902090711

AA4VG71NVDMT1/32L-NSF52F001D

R902136204

A4VG125HD9MT1/32R-NSF02F041S

R902092401

AA4VG180DWD1/32L-NSD52F071D

R902136209

A4VG125EP0MT1/32R-NSF02F021SP

R902096442

A4VG71DA1D2/32R-NAF02F001DQ

R902136259

A4VG125HD9MT1/32R-NSF02XXX1S

R902099864

A4VG28DGDT1/32R-NSC10K043E

R902136267

A4VG140HD9MT1/32R-NSF02F021S

R902099930

AA4VG250DWDMT1/32L-NSD60F071S

R902136370

A4VG180HD3DM1/32L-NSD02F021D

R902106041

A4VG90HWD1/32R-NAF02F021P

R902137498

AA4VG180EP4D1/32R-NSD60F071DP

R902108182

A4VG56HWDT1/32R-NZC02F016K

R902138600

A4VG180EP4DT1/32L-NZD02F001PP

R902110502

A4VG125DE1D1/32R-NZF02F071FP

R902138673

AA4VG105EP3D1/32R-NXFXXF021FC

R902111154

A4VG40HD3D2/32R-NZC02F023S

R902138976

A4VG180HD3DM1/32R-VSD02F001P

R902111163

A4VG40HD3D1/32R-NSC02F025S

R902146055

A4VG140EP4D1/32L-NSF02F001FP

R902111178

A4VG40HD3DT1/32L-NAC02F043D

R902146062

A4VG125EP3D1/32L-NZF02F001FP

R902111724

A4VG56EP4DM1/32R-NSC02F025PH

R902148231

A4VG40HD3DM1/32R-NSC02F046P

R902111872

A4VG56HD3D1/32R-NSC02F003D

R902148350

AA4VG250EP4DMT1/32R-NSD60F001DRP

R902111873

A4VG56HD3D1/32L-NSC02F005D

R902148549

AA4VG250EP4DT1/32L-NSD60F071DRP

R902111874

A4VG56HD3DM1/32L-NSC02F00XD

R902148574

AA4VG250EP4DT1/32L-NSD60F071DRP

R902111985

A4VG56HD3DT1/32L-NAC02F043D

R902148634

A4VG56HD3DT1/32L-NZC02F003P

R902112689

A4VG90HWDT1/32R-NZF02F021S

R902148645

A4VG250EP4DT1/32L-NZD10N001EP

R902112943

A4VG28DA1D8/32R-NZC10F015DP

R902149552

A4VG125EP4D1/32R-NAF02F021SP

R902113140

A4VG71EP4D1/32R-NSF02F011FP

R902150598

AA4VG125DGX1/32R-NSF52F69XF

R902113146

A4VG71EP4D1/32L-NSF02F001PP

R902151174

A4VG56DWDT1/32R-NTC02F045D

R902113204

A4VG71HD3D1/32R-NZF02F001S

R902151243

A4VG71HD3D2/32L-NZF02F001D

R902113237

A4VG71HD3DT1/32L-NZF02F041D

R902153005

A4VG125EZ2D1/32R-NZF02F001DP

R902113246

A4VG71HD3DT1/32L-NSF02F001D

R902153107

A4VG125HWDL1/32R-NZF02F021S

R902113374

AA4VG71HD3DMT1/32L-NSF52F041D

R902153146

A4VG90HD3D1/32R-NZF02F021F

R902117080

A4VG56EP4D1/32L-NSC02F025SP

R902153187

A4VG250HD3DT1/32R-NSD10F001D

R902118298

A4VG71EP3DT1/32R-NAF02F071FP

R902153216

A4VG125HD3DMT1/32L-NZF02F021F

R902118457

A4VG125HWD2/32R-NZF02F071S

R902153228

A4VG90EP4D1/32R-NZF02F001SP

R902119026

A4VG71EP4D1/32L-NZF02F001SP

R902154025

A4VG125HD3DM1/32R-NSF02F041B

R902119294

A4VG71EP4D1/32R-NAF02F071PP

R902154045

A4VG140EP4DT1/32L-NAF02F021SX

R902119321

A4VG250DA2D2/32R-NSD10F001DP

R902154054

A4VG140EP4DT1/32L-NAF02K691EX

R902120195

A4VG71EP3D1/32R-NSF02F071PP

R902154356

A4VG90EP4DT1/32L-NSF02F001SX

R902120242

A4VG40EP3D2/32R-NSC02F003PP

R902154366

A4VG71HD3DT2/32R-NZF02F021F

R902120398

A4VG125DA2D8/32R-NTF02F071FP

R902154520

A4VG180HWD7/32R-NSD02F021S

R902122244

A4VG56EP3D2/32R-NSC02F025PP

R902154798

A4VG90HD3DMT1/32L-NZF02F071S

R902122404

A4VG71EP4DT1/32R-NZF02F001SP

R902154950

A4VG71EP4DM1/32R-NZF02F001FX

R902122767

AA4VG90EP4D1/32L-NSF52K021EP

R902155505

A4VG125EP4D1/32L-NAF02F001DP

R902122809

A4VG90HD3DM1/32L-NZF02F07XD

R902155530

A4VG250EP4D1/32L-NTD10F001DP

R902122874

A4VG90HD3DT2/32L-NZF02F021S

R902155611

A4VG250EP4DM1/32L-NZD10K073EP

R902123351

A4VG125EP4DT1/32R-NTF02F071BP

R902155647

A4VG250EP4DT1/32L-NTD10F021SP

R902125116

A4VG125EP4D1/32R-NSF02F021DP

R902155675

A4VG180EP4DM1/32L-NSD02F00XBP

R902125209

A4VG125HD3D1/32R-NZF02F001D

R902155728

A4VG140EP4DM1/32R-VZF02F001PP

R902125252

A4VG125HD3D2/32R-NTF02F691P

R902155734

A4VG180EP4DM1/32L-NZD02K023EP

R902125253

A4VG125HD3D2/32R-NSF02F021P

R902155773

A4VG250HD3DT1/32R-NSD10F011S

R902125968

A4VG125EP0MT1/32R-NSF02F691SP

R902155815

A4VG56EZ2DM1/32R-NSC02F003FP

R902125975

A4VG140HD9MT1/32R-NSF02F691S

R902155874

A4VG180EP4DT1/32R-NZD02F011SP

R902125976

A4VG125HD9MT1/32R-NSF02F691S

R902155900

A4VG180EP4DT1/32R-NZD02F011DP

R902128419

A4VG250EP4DM1/32L-NSD10K07XEX

R902155941

A4VG180HD3D2/32L-NSD02FXX1P

R902128426

A4VG250EP4D1/32R-NZD10F001SP

R902155968

A4VG180EP4DM1/32L-NZD02K02XEP

R902128444

A4VG250EP4DT1/32R-NSD10F011DP

R902155989

A4VG180EP4D2/32L-NZD02F071DP

R902128445

A4VG250EP4D1/32R-NSD10F001DP

R902157531

A4VG40EP3D2/32R-NZC02F023PP

R902128461

A4VG250HD3D1/32R-NSD10F021S

R902157706

A4VG56DA1D4/32R-NZC02F025SP

R902128467

A4VG250HD3D1/32R-NSD10F691D

R902157987

A4VG71NVDT1/32R-NZF02F021S

R902128469

A4VG250HD3D1/32L-NSD10F001D

R902157988

A4VG56NVDT1/32R-NZC02F025S

R902128479

A4VG250HD3D1/32L-NZD10F001S

R902158141

A4VG180EP4D1/32R-NZD02F691SP

R902128480

A4VG250HD3D1/32R-NZD10F001D

R902158201

A4VG250HD3D1/32R-NSD10F071D

R902128482

A4VG250HD3DT1/32L-NZD10F001S

R902158365

A4VG90HD3DT1/32L-NZF02F021S

R902129162

A4VG125HD3DMT1/32L-NZF02F01XD

R902158391

A4VG180EP4DM1/32L-NSD02N003EP

R902129713

AA4VG180EP4DT1/32R-NSD52F001PP

R902158393

A4VG250EP4DM1/32L-NZD10K723EP

R902129723

A4VG180EP4D1/32R-NSD02F001DP

R902159323

A4VG90EP4DM1/32R-NZF02F071SP

R902129761

A4VG180HD3D1/32L-NSD02F001D

R902159467

A4VG250EP4DM1/32L-NZD10K07XEP

R902129764

A4VG180HD3D1/32L-NSD02F021D

R902159599

A4VG71HD3DT2/32L-NZF02F021S

R902129892

A4VG180HD9XMT1/32R-NSD02F011F

R902159612

A4VG90HD3DMT2/32L-NZF02F021B

R902129894

A4VG180HD3DMT1/32R-NZD02K021E

R902159633

A4VG250HD3DM2/32R-NZD10F041D

R902129897

A4VG180HD3D2/32R-NTD02F021S

R902159671

A4VG250EP4DMTX/32L-NZD10F021DP

R902129919

A4VG180EP4MT1/32R-NSD02F041SP

R902159695

A4VG90EP4D1/32R-NZF02F001SP

R902129920

A4VG180EP4MT1/32L-NSD02F071SP

R902159726

A4VG180DWDMT1/32R-NSD02F001D

R902131020

A4VG125EP3D1/32L-NSF10F021DC ES

R902159748

A4VG56EP4DT1/32L-NAC02K025EP

R902131079

A4VG250EP4D1/32R-NSD10F021DP

R902159902

A4VG90EZ2D1/32R-NAF02F071BP

R902131364

A4VG250HD3D1/32L-NSD10F071D

R902159912

A4VG56EP4DT2/32R-NZC02F025SP

R902131508

A4VG250HD3D1/32R-NZD10F721D

R902159944

AA4VG180EP4DMT1/32L-NTD52F071PP

R902131510

A4VG250HD3D1/32R-NSD10F001D

R902159979

A4VG180DGD2/32R-NTD02F021S


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