A11VO260LRDH2/11RNSD12K07 Bosch Rexroth Variable Piston Pump

Product Overview

The Bosch Rexroth A11VO Series 1x is a high-pressure variable displacement axial piston pump platform for open-circuit hydraulic systems. The design uses a swashplate architecture and is characterized by high power density, compact construction, high efficiency and optional through-drive capability. The A11VO version operates without an integrated charge pump, while the A11VLO version adds a charge pump for sizes 130 to 260 and allows higher rotational speeds.

The configurations covered here are:

• A11VO260LRDH2/11R-NSD12K07
• A11VO190LR3DH1/11R-NZD12N00

The A11VO260LRDH2 uses an LRDH2 control combination consisting of power control, pressure cut-off and a hydraulic stroke limiter with positive control. The A11VO190LR3DH1 combines LR3 high-pressure-related power override, pressure cut-off and an H1 hydraulic stroke limiter with negative control. These control descriptions are derived from the official Rexroth type-code system.

For aftermarket replacement, the correct engineering match must include displacement, rotation, sealing configuration, shaft design, mounting flange, working ports, through-drive arrangement and control configuration—not simply the A11VO frame size.

Our equivalent replacement units can also be subjected to 100% simulated working-condition testing to validate displacement response, pressure behavior, mechanical feedback and operating stability before shipment.

Technical Specifications

A11VO260LRDH2/11R-NSD12K07

• Brand: Bosch Rexroth
• Series: A11V(L)O Series 1x
• Pump Type: Open-circuit variable displacement axial piston pump
• Nominal Size: NG260
• Maximum Displacement: 260.0 cm³/rev
• Minimum Displacement: 0 cm³/rev
• Nominal Pressure: 350 bar
• Maximum Pressure: 400 bar
• Nominal Speed at Vg max: 2000 rpm
• Maximum Speed: 2300 rpm
• Nominal Flow at 2000 rpm: 468 L/min
• Rated Power at 350 bar: 273 kW
• Rated Torque at 350 bar: 1448 Nm
• Approx. Weight without Through Drive: 125 kg
• Case Volume: 4.6 L
• Control: LRDH2
• Control Function: Power controller + pressure cut-off + hydraulic stroke limiter
• Stroke Limiter: H2, positive control, Δp = 25 bar
• Rotation: R = clockwise
• Seal: N = NBR, shaft seal ring FKM
• Drive Shaft: S = ANSI B92.1a-1976 splined shaft for single pump
• Mounting Flange: D = SAE J744, 4-hole
• Working Ports: 12 = SAE pressure/suction ports with metric DIN 13 fastening thread and DIN 3852-based sealing
• Through Drive: K07 = SAE C, 1-1/4 in, 14 teeth, 12/24 DP
• Operating Mode: Open circuit, without charge pump

All numerical performance data above are from the Bosch Rexroth RE 92500/2024-11-13 technical data.

A11VO190LR3DH1/11R-NZD12N00

• Brand: Bosch Rexroth
• Series: A11V(L)O Series 1x
• Pump Type: Open-circuit variable displacement axial piston pump
• Nominal Size: NG190
• Maximum Displacement: 193.0 cm³/rev
• Minimum Displacement: 0 cm³/rev
• Nominal Pressure: 350 bar
• Maximum Pressure: 400 bar
• Nominal Speed: 2100 rpm
• Maximum Speed: 2100 rpm
• Nominal Flow: 405 L/min
• Rated Power at 350 bar: 236 kW
• Rated Torque at 350 bar: 1075 Nm
• Approx. Weight without Through Drive: 95 kg
• Case Volume: 3.8 L
• Control: LR3DH1
• LR3: Power controller with high-pressure-related override
• D: Pressure cut-off
• H1: Hydraulic stroke limiter, negative control, Δp = 25 bar
• Rotation: R = clockwise
• Seal: N = NBR, shaft seal ring FKM
• Drive Shaft: Z = DIN 5480 splined shaft
• Mounting Flange: D = SAE J744, 4-hole
• Working Ports: 12 = SAE pressure/suction ports with metric DIN 13 fastening thread
• Through-Drive Code: N00
• Operating Mode: Open circuit, without charge pump

The displacement, pressure, speed, flow, power, torque, weight and case-volume values are listed in the current RE 92500 technical data. The LR3/D/H1 control combination follows the official Rexroth ordering-code definitions.

Key Technical Advantages

1. 350 Bar Nominal High-Pressure Platform

The A11VO Series 1x is specified for a 350 bar nominal pressure and 400 bar maximum pressure. Rexroth defines 400 bar as the maximum pressure within a single operating period rather than an unlimited continuous operating point. The published definition limits a single maximum-pressure period to less than one second with an overall accumulated operating period of 300 hours.

2. Swashplate Variable Displacement Architecture

The pump uses a swashplate design with displacement adjustable from zero to the specified maximum geometric displacement. The NG190 and NG260 versions provide 193 and 260 cm³/rev respectively, allowing substantial hydraulic flow at controlled displacement.

3. LRDH2 Multi-Function Control

The A11VO260LRDH2 configuration combines:

• Power control
• Pressure cut-off
• Hydraulic stroke limiter
• Positive control with Δp = 25 bar

This is more specific than describing the pump simply as a “pressure-controlled variable pump.”

4. LR3DH1 Control Architecture

The A11VO190LR3DH1 configuration combines a power controller with high-pressure-related override, pressure cut-off and a hydraulic stroke limiter using negative control. This makes complete model-code matching important during aftermarket replacement.

5. Through-Drive Capability

The A11V(L)O family supports through-drive arrangements for mounting additional pumps up to the same size. For the A11VO260 configuration, the K07 code identifies a defined SAE C through-drive interface.

6. High Power Density

The official technical data show 273 kW at 350 bar and 2000 rpm for the NG260 configuration, while NG190 delivers 236 kW at 350 bar and 2100 rpm. These figures illustrate the high hydraulic power capability of the platform.

7. Quantified Dynamic Characteristics

Rexroth specifies rotary-group inertia and maximum angular acceleration as part of the technical data:

• NG190 rotary-group inertia: 0.055 kg·m²
• NG260 rotary-group inertia: 0.0878 kg·m²
• NG190 maximum angular acceleration: 6800 rad/s²
• NG260 maximum angular acceleration: 4800 rad/s²

These values are relevant when evaluating driveline dynamics, coupling selection and engine/pump torsional behavior.

8. No Unsupported Material Claims

The current RE 92500 document does not publish exact alloy grades or heat-treatment hardness for the cylinder block, piston assemblies, swashplate or valve plate. Therefore, a technically controlled product page should not invent material grades. The verified engineering characteristics are the swashplate architecture, compact design, high efficiency, high power density, control architecture, sealing configuration and standardized shaft/flange interfaces.

Application Areas

Bosch Rexroth positions A11VO within open-circuit working hydraulics for mobile machinery. A11VO is used as a high-pressure working pump in independent hydraulic circuits, including the working hydraulics of mobile machines.

Typical applications include:

• Excavators
• Walking Excavators
• Wheel Loaders
• Track Loaders
• Mining Machinery
• Demolition Equipment
• Forestry Machinery
• Agricultural Machinery
• Cranes
• High-Power Industrial Hydraulic Power Units

A Bosch Rexroth case example specifically describes an A11VO working pump supplying a Powerline hydraulic circuit for attachments such as buckets, grabs and quick couplers, as well as demolition, mining, mulching, harvesting and stump-grinding equipment.

Expert Maintenance Tips

1. Protect the Inlet Conditions

For A11VO pumps without charge pumps, Rexroth specifies a minimum suction pressure of ≥0.8 bar absolute and a maximum suction pressure of ≤30 bar absolute. Proper inlet sizing and low suction restriction are essential for preventing inlet starvation and damage.

2. Keep Case Pressure Under Control

Maximum case pressure at T1/T2 is 2 bar. The drain circuit must be properly routed to the reservoir and must not create excessive backpressure.

3. Maintain ISO 4406 Cleanliness

Bosch Rexroth specifies a hydraulic-fluid cleanliness level of at least ISO 4406 20/18/15. When viscosity at the drain port falls below 10 mm²/s, the required cleanliness level becomes 19/17/14.

4. Apply Housing Flushing When Required

For configurations using EP, EC4, EB4, HD or stroke limiters such as H1/H2/U2/U6, housing flushing is required during extended zero-flow or low-pressure operation under the specified conditions. The official document gives the required flushing flow by nominal size.

5. Verify Rotation Before Commissioning

The R code identifies clockwise rotation when viewed from the drive shaft. Confirm this against the existing machine’s rotation before startup.

6. Match Shaft and Mounting Configuration Exactly

A11VO260LRDH2 uses the S shaft + D flange + K07 through-drive configuration, while A11VO190LR3DH1 uses the Z shaft + D flange + N00 through-drive configuration. These differences are mechanically significant and must be checked before replacement.

7. Distinguish Rated Speed from Maximum Speed

For A11VO260, the rated speed is 2000 rpm and the listed maximum speed is 2300 rpm. For A11VO190, both the nominal and maximum speed values are 2100 rpm under the published conditions. The two values should therefore be displayed separately on the product page.