A2V500HDLHR5GP A2V1000HHX5EP Rexroth Bent Axis Pump

Product Overview

The A2V500HDLHR5GP/08 (Material No. R2145387), A2V1000HHX5EP, and A2V250HDHR5GP are core models within the Bosch Rexroth A2V series 5 of bent-axis variable displacement axial piston pumps, corresponding to the 500 cc, 1000 cc, and 250 cc large displacement specifications respectively. The A2V series features a bent-axis design for hydrostatic drives in closed, semi-closed, and open circuits. Maximum flow is proportional to drive speed and displacement and is infinitely variable at constant drive speed. The A2V series is interchangeable with Uchida, Hydromatik, and Brueninghaus equivalents.

A2V Series Core Features: New, simplified high performance rotary group with enhanced technical data and well-proven spherical control area; heavy duty rolling bearings for intermittent high pressure operation; for continuous duty at high pressures, hydrostatic bearings are available; improved port plate design and compact design reduces noise level by 5 dBA; operation on fire-resistant fluids is possible; complete primary units with all auxiliary devices for closed circuits.

Model Code Breakdown (for procurement and engineering reference):

Using A2V 500 HDLHR 5GP/08 as example:

• A2V: Rexroth bent-axis variable displacement axial piston pump series

• 500: Nominal size (NG), geometric displacement 500 cm³/rev

• HD: Hydraulic control, pressure related — drives servo piston through pilot pressure signals to change swash axis inclination angle for displacement adjustment

• L: Additional constant HP control function

• H: Additional function code

• R: Clockwise rotation (viewed from shaft end)

• 5: Series 5

• GP: G = housed pump design; P = keyed shaft

• /08: Design number

• R2145387: Rexroth material number

Using A2V1000HHX5EP as example:

• A2V: Rexroth bent-axis variable displacement axial piston pump series

• 1000: Nominal size (NG), geometric displacement 1000 cm³/rev

• HHX: Hydraulic control variant code

• 5: Series 5

• EP: Electric Proportional control, with proportional solenoid

Using A2V250HDHR5GP as example:

• A2V: Rexroth bent-axis variable displacement axial piston pump series

• 250: Nominal size (NG), geometric displacement 250 cm³/rev

• HD: Hydraulic control, pressure related

• H: Additional function code

• R: Clockwise rotation

• 5GP: Series 5, housed pump design, keyed shaft

Drop-in Replacement Advantage: Manufactured to exact Rexroth OEM specifications, these pumps achieve complete drop-in interchangeability with the original A2V series for mounting flange, shaft dimensions, port layout, and control module interface. The A2V series is compatible with Uchida and other brand equivalents. Every pump undergoes 100% simulated load testing prior to shipment, validating 350 bar pressure loading, variable displacement control response, and volumetric efficiency under conditions replicating real-world duty cycles.

Technical Specifications 

A2V250 Series General Specifications:

• Series: Rexroth A2V Series 5 (Bent-Axis Variable Displacement Pump)

• Nominal Size: NG 250

• Geometric Displacement: 250 cm³/rev

• Rated Pressure: 350 bar (continuous)

• Peak Pressure: 400 bar (intermittent)

• Maximum Speed (Closed Circuit): 2500 rpm

• Maximum Speed (Semi-Closed Circuit, Vg max): 1320 rpm

• Maximum Speed (Open Circuit, Vg max): 1500 rpm

• Maximum Output Flow (Closed Circuit): 625 L/min

• Maximum Power (Δp = 350 bar, Closed Circuit): 365 kW

• Maximum Output Flow (Semi-Closed Circuit, Vg max): 320 L/min

• Maximum Power (Semi-Closed Circuit, Vg max): 192 kW

• Maximum Output Flow (Open Circuit, Vg max): 364 L/min

• Maximum Power (Open Circuit, Vg max): Approx. 219 kW

• Mounting: Flange mounting

• Shaft: Keyed shaft (P code)

• Housing Material: High-strength cast iron

• Seal Material: NBR, suitable for mineral oil-based and fire-resistant hydraulic fluids

• Fluid Cleanliness: ISO 4406 18/15/12 or better

• Recommended Fluid: ISO VG32 / VG46 anti-wear hydraulic oil

Model A2V250HDHR5GP Configuration:

• Model Code: A2V250HDHR5GP

• Material Number: R910662739 (example)

• Control Type: HD — Hydraulic Control, Pressure Related

• Additional Function: H — Additional function code

• Rotation: Clockwise (R code)

• Shaft: Keyed shaft (P code)

• Series: 5

• Rated/Peak Pressure: 350 bar / 400 bar

A2V500 Series General Specifications:

• Series: Rexroth A2V Series 5 (Bent-Axis Variable Displacement Pump)

• Nominal Size: NG 500

• Geometric Displacement: 500 cm³/rev

• Rated Pressure: 350 bar (continuous)

• Peak Pressure: 400 bar (intermittent)

• Maximum Speed (Closed Circuit): 2000 rpm

• Maximum Speed (Semi-Closed Circuit, Vg max): 1060 rpm

• Maximum Speed (Open Circuit, Vg max): 1200 rpm

• Maximum Output Flow (Closed Circuit): 1000 L/min

• Maximum Power (Δp = 350 bar, Closed Circuit): 583 kW

• Maximum Output Flow (Semi-Closed Circuit, Vg max): 514 L/min

• Maximum Power (Semi-Closed Circuit, Vg max): 309 kW

• Maximum Output Flow (Open Circuit, Vg max): 582 L/min

• Maximum Power (Open Circuit, Vg max): Approx. 291 kW

• Maximum Torque: 2864 N·m

• Mounting: Flange mounting

• Shaft: Keyed shaft (P code)

• Housing Material: High-strength cast iron

• Seal Material: NBR, suitable for mineral oil-based and fire-resistant hydraulic fluids

• Fluid Cleanliness: ISO 4406 18/15/12 or better

Model A2V500HDLHR5GP/08 Configuration:

• Model Code: A2V500HDLHR5GP/08

• Material Number: R2145387

• Control Type: HD — Hydraulic Control, Pressure Related

• Additional Function: L — Constant HP Control; H — Additional function code

• Rotation: Clockwise (R code)

• Shaft: Keyed shaft (P code)

• Series: 5

• Design Number: /08

A2V1000 Series General Specifications:

• Series: Rexroth A2V Series 5 (Bent-Axis Variable Displacement Pump)

• Nominal Size: NG 1000

• Geometric Displacement: 1000 cm³/rev

• Rated Pressure: 350 bar (continuous)

• Peak Pressure: 400 bar (intermittent)

• Maximum Speed (Closed Circuit): 1600 rpm

• Maximum Speed (Semi-Closed Circuit, Vg max): 850 rpm

• Maximum Speed (Open Circuit, Vg max): 950 rpm

• Maximum Output Flow (Closed Circuit): 1600 L/min

• Maximum Power (Δp = 350 bar, Closed Circuit): 933 kW

• Maximum Output Flow (Semi-Closed Circuit, Vg max): 825 L/min

• Maximum Power (Semi-Closed Circuit, Vg max): 496 kW

• Maximum Output Flow (Open Circuit, Vg max): 921 L/min

• Maximum Power (Open Circuit, Vg max): Approx. 487 kW

• Mounting: Flange mounting

• Shaft: Per EP code specification

• Housing Material: High-strength cast iron

• Seal Material: NBR, suitable for mineral oil-based and fire-resistant hydraulic fluids

Model A2V1000HHX5EP Configuration:

• Model Code: A2V1000HHX5EP

• Control Type: HHX — Hydraulic control variant; EP — Electric Proportional Control

• Rotation: Per model configuration

• Series: 5

• Shaft: Per model configuration

A2V Series Large Displacement Size Reference:

• A2V250: 250 cm³/rev, closed circuit max speed 2500 rpm, max flow 625 L/min, max power 365 kW

• A2V355: 355 cm³/rev, closed circuit max speed 2240 rpm, max flow 795 L/min, max power 464 kW

• A2V500: 500 cm³/rev, closed circuit max speed 2000 rpm, max flow 1000 L/min, max power 583 kW

• A2V1000: 1000 cm³/rev, closed circuit max speed 1600 rpm, max flow 1600 L/min, max power 933 kW

Key Technical Advantages

1. Bent-Axis Design with High Power Density
The A2V series employs a bent-axis design where the piston axis is angled relative to the drive axis. The piston lateral force exerted on the cylinder block is minimal, reducing the tilting moment between the cylinder block and valve plate, allowing the rotary group to maintain a stable hydrostatic bearing film at high speeds. The A2V500 delivers maximum power of 583 kW and maximum flow of 1000 L/min in closed circuit at 350 bar nominal pressure; the A2V1000 delivers 933 kW and 1600 L/min respectively, leading the large displacement class in power density.

2. Heavy-Duty Rolling Bearings with Hydrostatic Bearing Option
The A2V series is equipped with heavy duty rolling bearings specifically designed for intermittent high pressure operation. For applications requiring continuous high-pressure operation, hydrostatic bearings are available, effectively reducing bearing wear rates and extending maintenance intervals. This dual bearing configuration enables the A2V series to flexibly adapt to operating conditions ranging from intermittent shock loads to continuous high-pressure operation.

3. HD Hydraulic Control with L Constant HP Function
The A2V500HDLHR5GP/08 and A2V250HDHR5GP are equipped with HD hydraulic control (pressure related). HD control drives the servo piston through pilot pressure signals to change the swash axis inclination angle for stepless displacement adjustment. The HD control type enables real-time displacement adjustment based on control pressure signals with fast response times. The A2V500HDLHR5GP/08 additionally integrates L constant HP control function, enabling the pump to automatically reduce displacement along a constant power curve as system pressure rises, achieving precise matching between hydraulic system power and prime mover output power while effectively preventing prime mover overload.

4. Port Plate Design with 5 dBA Noise Reduction
The A2V series employs improved port plate design and compact construction, reducing noise levels by 5 dBA compared to previous generation products. Metering slot pre-compression and pre-decompression angles are optimized to minimize pressure spikes and flow pulsation during piston chamber high-to-low pressure transitions. The compact housing design further suppresses structural vibration and fluid-borne noise propagation.

5. Fire-Resistant Hydraulic Fluid Compatibility
The A2V series is compatible with fire-resistant hydraulic fluids, providing safe hydraulic power solutions for industrial applications with fire risk (such as metallurgy, mining, and marine). The seal material is NBR, with standard configuration suitable for mineral oil-based hydraulic fluids. For HFD and other fire-resistant hydraulic fluid applications, select FKM seal configuration.

6. Complete Primary Units with Modular System
The A2V series offers complete primary units, integrating all auxiliary devices required for closed circuits, including valve blocks and boost pumps, forming ready-to-install closed-circuit pump groups. Modular design supports flexible combinations of various control modes and additional functions. Standardized mounting interfaces require no adaptation for replacement, significantly reducing equipment downtime.

Application Areas

• Metallurgical Equipment: Rolling mill hydraulic screwdown systems, continuous casting machine hydraulic systems, steelmaking furnace hydraulic power sources

• Forging Equipment: Large open-die forging presses, closed-die forging press main hydraulic pumps (core application areas for A2V500 and A2V1000)

• Mining & Tunneling: Tunnel boring machine thrust hydraulic systems, mine hoist hydraulic drives, roadheader hydraulic systems

• Marine & Offshore: Ship deck machinery hydraulic systems, large steering gear hydraulic power units, marine winch hydraulic drives

• Test Equipment: Large hydraulic test benches, fatigue testing machine hydraulic power sources

• Power Generation: Turbine bypass system hydraulic actuators, hydro turbine governor hydraulic systems

• Industrial Hydraulic Power Units: Large hydraulic power units, central oil supply systems

Expert Maintenance Tips

1. Hydraulic Fluid Cleanliness
The A2V series HD control servo spool operates with extremely tight clearances and is highly sensitive to particulate contamination. System fluid cleanliness must meet ISO 4406 18/15/12 or better. Recommended fluids are ISO VG32 or VG46 anti-wear hydraulic oils. Install a 10 μm absolute-rated filter element at the pump inlet. Replace elements at 500 hours after first commissioning, then every 1,000 operating hours or 6 months, whichever comes first.

2. HD Hydraulic Control and L Constant HP Control Commissioning
The A2V500HDLHR5GP/08 and A2V250HDHR5GP HD control types drive the servo piston through pilot pressure signals. During commissioning, first confirm that pilot pressure supply is normal and the control pressure setting meets system requirements. The L constant HP control function’s power control curve start point is mechanically adjustable. During commissioning, set the power control start point with the pump at neutral (zero displacement), then apply load at rated speed and adjust the screw to set the power curve (P×Q=constant). The power control setting must ensure that the system does not exceed the prime mover’s available power at maximum working pressure.

3. A2V1000HHX5EP Electro-Proportional Control Commissioning
The A2V1000HHX5EP EP control receives current signals via proportional solenoid. During commissioning, confirm that the proportional solenoid supply voltage and current range conform to Rexroth technical specifications. Verify the control current signal waveform with an oscilloscope every 2,000 hours to ensure proper PWM waveform and accurate displacement control. The HHX hydraulic control variant’s additional functions should be confirmed during commissioning.

4. Case Drain Line Requirements
The case drain line must return directly to the reservoir. Maximum permissible back pressure is 2 bar (0.2 MPa). The drain outlet must terminate below oil level at all times to prevent air ingestion. The drain line diameter must not be smaller than the pump case drain port size. For 500 cc and 1000 cc class large displacement pumps, case drain flow is substantial — drain line design must fully account for flow demand to avoid excessive case pressure from pipe resistance.

5. Pre-Start Priming and Air Bleeding
Before first start, fill the pump housing with clean hydraulic fluid through the case drain port. After installation, turn the drive shaft by hand several revolutions to confirm free rotation without binding. Position the control at neutral (zero displacement) and run at low speed for 5–10 minutes. Verify continuous bubble-free flow from the case drain. Only then apply load.

6. Fire-Resistant Hydraulic Fluid Compatibility Confirmation
If the system uses HFD or other fire-resistant hydraulic fluids, confirm that the pump seal material configuration is FKM (fluororubber) and that the hydraulic fluid brand and model are compatible with Rexroth technical specifications. The A2V series standard configuration is NBR seals, suitable for mineral oil-based hydraulic fluids. When changing hydraulic fluid types, simultaneously check seal material compatibility and perform system flushing and fluid replacement according to Rexroth technical manual requirements.