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.
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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 |
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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 |
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|
Flow |
l/min |
160 |
202 |
234 |
275 |
356 |
450 |
600 |
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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 |
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Filling capacity |
V |
L |
1.1 |
1.5 |
1.3 |
1.5 |
2.1 |
3.1 |
6.3 |
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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.
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Rexroth A4VG pump part number and model |
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R902063240 |
A4VG125HWD3L/32R-NZF02F071K |
R902131523 |
A4VG71DA1D8/32R-NSF02F021BP |
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R902072787 |
A4VG28DGDT1/32R-NSC10F045S |
R902131609 |
A4VG125EP4DT1/32R-NZF02F001BP |
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R902074032 |
A4VG90HWDT1/32L-NZF02F001S |
R902131820 |
A4VG250HD3D1/32R-NZD10F011D |
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R902080089 |
A4VG56HWD2/32R-NZC02F003S |
R902131969 |
A4VG56EP4D1/32L-NAC02F075SP |
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R902081217 |
A4VG180NVDT1/32R-NZD02F021S |
R902133053 |
A4VG125HD3DMT1/32R-NZF02F001D |
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R902085521 |
A4VG71DA2D7/32R-NZF02F021SP |
R902133113 |
A4VG125EP3DM1/32R-NAF02F071DP |
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R902085522 |
A4VG125DA2D7/32R-NZF02F021SP |
R902133354 |
A4VG125HD3D1/32R-NSF02F021D |
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R902085703 |
A4VG71HWD2/32R-NZF02F071P |
R902134324 |
A4VG250HD3D1/32L-NSD10F041D |
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R902085891 |
A4VG71HWDT1/32R-NAF02K041E |
R902134481 |
AA4VG140EP4D1/32R-NXF63F071DP |
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R902088221 |
A4VG90HWD2/32R-NZF02F071S |
R902136132 |
A4VG125HD3D2/32R-NAF02F021S |
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R902089470 |
A4VG71DA1D2/32R-NSF02F011PP |
R902136173 |
A4VG71DA1D2/32R-NZF02F021SQ |
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R902090711 |
AA4VG71NVDMT1/32L-NSF52F001D |
R902136204 |
A4VG125HD9MT1/32R-NSF02F041S |
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R902092401 |
AA4VG180DWD1/32L-NSD52F071D |
R902136209 |
A4VG125EP0MT1/32R-NSF02F021SP |
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R902096442 |
A4VG71DA1D2/32R-NAF02F001DQ |
R902136259 |
A4VG125HD9MT1/32R-NSF02XXX1S |
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R902099864 |
A4VG28DGDT1/32R-NSC10K043E |
R902136267 |
A4VG140HD9MT1/32R-NSF02F021S |
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R902099930 |
AA4VG250DWDMT1/32L-NSD60F071S |
R902136370 |
A4VG180HD3DM1/32L-NSD02F021D |
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R902106041 |
A4VG90HWD1/32R-NAF02F021P |
R902137498 |
AA4VG180EP4D1/32R-NSD60F071DP |
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R902108182 |
A4VG56HWDT1/32R-NZC02F016K |
R902138600 |
A4VG180EP4DT1/32L-NZD02F001PP |
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A4VG125DE1D1/32R-NZF02F071FP |
R902138673 |
AA4VG105EP3D1/32R-NXFXXF021FC |
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R902111154 |
A4VG40HD3D2/32R-NZC02F023S |
R902138976 |
A4VG180HD3DM1/32R-VSD02F001P |
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R902111163 |
A4VG40HD3D1/32R-NSC02F025S |
R902146055 |
A4VG140EP4D1/32L-NSF02F001FP |
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R902111178 |
A4VG40HD3DT1/32L-NAC02F043D |
R902146062 |
A4VG125EP3D1/32L-NZF02F001FP |
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R902111724 |
A4VG56EP4DM1/32R-NSC02F025PH |
R902148231 |
A4VG40HD3DM1/32R-NSC02F046P |
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R902111872 |
A4VG56HD3D1/32R-NSC02F003D |
R902148350 |
AA4VG250EP4DMT1/32R-NSD60F001DRP |
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R902111873 |
A4VG56HD3D1/32L-NSC02F005D |
R902148549 |
AA4VG250EP4DT1/32L-NSD60F071DRP |
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R902111874 |
A4VG56HD3DM1/32L-NSC02F00XD |
R902148574 |
AA4VG250EP4DT1/32L-NSD60F071DRP |
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R902111985 |
A4VG56HD3DT1/32L-NAC02F043D |
R902148634 |
A4VG56HD3DT1/32L-NZC02F003P |
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R902112689 |
A4VG90HWDT1/32R-NZF02F021S |
R902148645 |
A4VG250EP4DT1/32L-NZD10N001EP |
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R902112943 |
A4VG28DA1D8/32R-NZC10F015DP |
R902149552 |
A4VG125EP4D1/32R-NAF02F021SP |
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R902113140 |
A4VG71EP4D1/32R-NSF02F011FP |
R902150598 |
AA4VG125DGX1/32R-NSF52F69XF |
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R902113146 |
A4VG71EP4D1/32L-NSF02F001PP |
R902151174 |
A4VG56DWDT1/32R-NTC02F045D |
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R902113204 |
A4VG71HD3D1/32R-NZF02F001S |
R902151243 |
A4VG71HD3D2/32L-NZF02F001D |
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R902113237 |
A4VG71HD3DT1/32L-NZF02F041D |
R902153005 |
A4VG125EZ2D1/32R-NZF02F001DP |
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R902113246 |
A4VG71HD3DT1/32L-NSF02F001D |
R902153107 |
A4VG125HWDL1/32R-NZF02F021S |
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R902113374 |
AA4VG71HD3DMT1/32L-NSF52F041D |
R902153146 |
A4VG90HD3D1/32R-NZF02F021F |
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R902117080 |
A4VG56EP4D1/32L-NSC02F025SP |
R902153187 |
A4VG250HD3DT1/32R-NSD10F001D |
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R902118298 |
A4VG71EP3DT1/32R-NAF02F071FP |
R902153216 |
A4VG125HD3DMT1/32L-NZF02F021F |
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R902118457 |
A4VG125HWD2/32R-NZF02F071S |
R902153228 |
A4VG90EP4D1/32R-NZF02F001SP |
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R902119026 |
A4VG71EP4D1/32L-NZF02F001SP |
R902154025 |
A4VG125HD3DM1/32R-NSF02F041B |
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R902119294 |
A4VG71EP4D1/32R-NAF02F071PP |
R902154045 |
A4VG140EP4DT1/32L-NAF02F021SX |
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R902119321 |
A4VG250DA2D2/32R-NSD10F001DP |
R902154054 |
A4VG140EP4DT1/32L-NAF02K691EX |
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R902120195 |
A4VG71EP3D1/32R-NSF02F071PP |
R902154356 |
A4VG90EP4DT1/32L-NSF02F001SX |
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R902120242 |
A4VG40EP3D2/32R-NSC02F003PP |
R902154366 |
A4VG71HD3DT2/32R-NZF02F021F |
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R902120398 |
A4VG125DA2D8/32R-NTF02F071FP |
R902154520 |
A4VG180HWD7/32R-NSD02F021S |
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R902122244 |
A4VG56EP3D2/32R-NSC02F025PP |
R902154798 |
A4VG90HD3DMT1/32L-NZF02F071S |
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R902122404 |
A4VG71EP4DT1/32R-NZF02F001SP |
R902154950 |
A4VG71EP4DM1/32R-NZF02F001FX |
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R902122767 |
AA4VG90EP4D1/32L-NSF52K021EP |
R902155505 |
A4VG125EP4D1/32L-NAF02F001DP |
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R902122809 |
A4VG90HD3DM1/32L-NZF02F07XD |
R902155530 |
A4VG250EP4D1/32L-NTD10F001DP |
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R902122874 |
A4VG90HD3DT2/32L-NZF02F021S |
R902155611 |
A4VG250EP4DM1/32L-NZD10K073EP |
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R902123351 |
A4VG125EP4DT1/32R-NTF02F071BP |
R902155647 |
A4VG250EP4DT1/32L-NTD10F021SP |
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R902125116 |
A4VG125EP4D1/32R-NSF02F021DP |
R902155675 |
A4VG180EP4DM1/32L-NSD02F00XBP |
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R902125209 |
A4VG125HD3D1/32R-NZF02F001D |
R902155728 |
A4VG140EP4DM1/32R-VZF02F001PP |
|
R902125252 |
A4VG125HD3D2/32R-NTF02F691P |
R902155734 |
A4VG180EP4DM1/32L-NZD02K023EP |
|
R902125253 |
A4VG125HD3D2/32R-NSF02F021P |
R902155773 |
A4VG250HD3DT1/32R-NSD10F011S |
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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 |
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R902128426 |
A4VG250EP4D1/32R-NZD10F001SP |
R902155968 |
A4VG180EP4DM1/32L-NZD02K02XEP |
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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 |
