A11V040DRS/10R-NSC12N00 Rexroth Variable Pump 350Bar

Product Overview

The A11V040DRS/10R-NSC12N00 is a Bosch Rexroth A11VO series 10 swashplate-type axial piston variable displacement pump, nominal size 40 (geometric displacement 42 cm³/rev), purpose-designed for hydrostatic drives in open-circuit hydraulic systems, with a rated working pressure of 350 bar and maximum pressure of 400 bar. The pump operates on the swashplate principle, with flow proportional to drive speed and displacement, infinitely variable from zero to maximum by adjusting the swashplate angle.

The full order code A11V040DRS/10R-NSC12N00 decodes as follows: A11VO indicates the open-circuit swashplate variable pump series; 40 is the nominal size (actual geometric displacement 42 cm³/rev); DRS denotes pressure control with Load Sensing — integrating pressure compensation and flow control functions to dynamically manage system pressure and flow demands; 10 is the series designation; R indicates right-hand rotation (clockwise, viewed from shaft end); N specifies NBR nitrile rubber seals; S specifies splined shaft (ANSI B92.1a compliant); C12 specifies SAE 2-bolt mounting flange (SAE J744 standard); N00 indicates no through-drive and standard port configuration.

Manufactured to exact Rexroth A11VO platform specifications, this pump delivers true drop-in interchangeability. Every unit undergoes 100% simulated operating condition testing before shipment.

Technical Specifications 

A11V040DRS/10R-NSC12N00 (Size 40)

• Model: A11V040DRS/10R-NSC12N00

• Manufacturer: Bosch Rexroth

• Series: A11VO series 10

• Design: Swashplate-type axial piston variable displacement pump, open-circuit

• Nominal Size: 40

• Geometric Displacement: 42 cm³/rev

• Rated Working Pressure: 350 bar (35 MPa)

• Peak Pressure: 400 bar (40 MPa)

• Maximum Speed (Vg max): 3000 rpm

• Maximum Speed (Vg ≤ Vg max): 3500 rpm

• Theoretical Flow at nmax and Vg max: 126 L/min

• Maximum Power (Δp = 350 bar): 74 kW

• Maximum Torque (Vg max and Δp = 350 bar): 234 N·m

• Rotation Direction: Right hand (clockwise, viewed from shaft end)

• Control Type: DRS — Pressure control with Load Sensing (LS)

• Mounting Flange: SAE 2-bolt flange (SAE J744)

• Shaft Specification: Splined shaft (ANSI B92.1a)

• Seal Material: NBR nitrile rubber

• Through-Drive: No

• Port Configuration: Standard SAE flanges, pressure and suction ports laterally opposite

• Weight (Reference): Approx. 28–32 kg

• Operating Fluid: Mineral hydraulic oil

A11VO95DRS/10R-NSD12N00 (Size 95)

• Model: A11VO95DRS/10R-NSD12N00

• Manufacturer: Bosch Rexroth

• Series: A11VO series 10

• Design: Swashplate-type axial piston variable displacement pump, open-circuit

• Nominal Size: 95

• Geometric Displacement: 95 cm³/rev

• Rated Working Pressure: 350 bar (35 MPa)

• Peak Pressure: 400 bar (40 MPa)

• Maximum Speed (Vg max): 2350 rpm

• Maximum Speed (Vg ≤ Vg max): 2780 rpm

• Theoretical Flow at nmax and Vg max: 220 L/min

• Maximum Power (Δp = 350 bar): 128 kW

• Maximum Torque (Vg max and Δp = 350 bar): 521 N·m

• Rotation Direction: Right hand (clockwise, viewed from shaft end)

• Control Type: DRS — Pressure control with Load Sensing (LS)

• Mounting Flange: SAE 4-bolt flange (SAE J744)

• Shaft Specification: Splined shaft (ANSI B92.1a)

• Seal Material: NBR nitrile rubber

• Through-Drive: No

• Weight (Reference): Approx. 50 kg

• Operating Fluid: Mineral hydraulic oil

A11VO75/11L-NZD12N00 (Size 75)

• Model: A11VO75/11L-NZD12N00

• Manufacturer: Bosch Rexroth

• Series: A11VO series 11

• Design: Swashplate-type axial piston variable displacement pump, open-circuit

• Nominal Size: 75

• Geometric Displacement: 74 cm³/rev

• Rated Working Pressure: 350 bar (35 MPa)

• Peak Pressure: 400 bar (40 MPa)

• Maximum Speed (Vg max): 2550 rpm

• Maximum Speed (Vg ≤ Vg max): 3000 rpm

• Theoretical Flow at nmax and Vg max: 189 L/min

• Maximum Power (Δp = 350 bar): 110 kW

• Maximum Torque (Vg max and Δp = 350 bar): 412 N·m

• Rotation Direction: Left hand (counterclockwise, viewed from shaft end)

• Control Type: Confirm full control configuration against Rexroth official ordering code table

• Mounting Flange: SAE 4-bolt flange

• Shaft Specification: Splined shaft

• Seal Material: NBR nitrile rubber

• Through-Drive: No

• Weight (Reference): Approx. 40 kg

Key Technical Advantages

1. Precise System Management via DRS Pressure/Flow Compound Control

The DRS control integrates pressure compensation and Load Sensing (LS) functions, simultaneously managing system pressure and flow demands. When system pressure approaches the set value, the pump automatically de-strokes to maintain constant pressure; when the load-sensing signal (Δp) changes, the pump adjusts flow output based on throttle opening. This compound control strategy significantly reduces energy consumption and oil temperature rise in injection molding holding phases and press pressure-maintenance cycles — ideal for complex hydraulic systems requiring dynamic pressure and flow management.

2. High Power Density and Compact Design from Swashplate Architecture

The A11VO series employs a swashplate design in which pistons act on the swashplate through slippers, delivering a compact structure with high power density. The series covers sizes 40 through 260 with a uniform rated pressure of 350 bar and peak pressure of 400 bar across all sizes, combining high-pressure capability with compact installation dimensions for diverse mobile machinery and industrial power unit applications.

3. 100% Through-Drive Capability for Multi-Pump Systems

The A11VO series supports 100% through-drive capability, allowing same-size or smaller gear pumps and axial piston pumps to be connected in series at the rear of the pump for multi-pump common-shaft output. This extends hydraulic system flow output without increasing installation envelope, simplifying complex hydraulic system layout. When connecting in series, rear pump weight and coaxial precision must be strictly controlled, and total torque and speed matching must be verified.

4. Full Size Coverage with Standardized Interfaces

The A11VO series covers eight sizes — 40, 60, 75, 95, 130, 145, 190, and 260 — spanning displacements from 42 to 260 cm³/rev. Mounting flanges, shafts, and ports use standardized designs per SAE J744, ensuring interface compatibility across displacement sizes for flexible selection and replacement.

5. 100% Simulated Operating Condition Testing

Every pump undergoes a comprehensive factory test protocol: continuous operation at 350 bar rated pressure to verify volumetric efficiency, 400 bar peak pressure cycling to validate housing and seal integrity, and full-speed-range verification of displacement control linearity and DRS control response. Test documentation is supplied with each unit.

Application Areas

• Construction Machinery: Excavators, wheel loaders, road rollers — travel and implement hydraulic systems

• Material Handling Equipment: Forklift and reach stacker hydraulic power systems

• Concrete Pump Trucks: Boom hydraulic systems and pumping circuit hydraulic drives

• Industrial Power Units: Injection molding machines, presses, machine tool hydraulic systems

• Mining & Metallurgical Equipment: Mine transport vehicles, continuous casting machine hydraulic drives

• Agricultural Machinery: Tractor hydraulic hitch and implement drive systems

Expert Maintenance Tips

1. Mandatory Case Pre-Fill and Air Purging

After installation, fill through the highest case port with clean hydraulic fluid filtered to ≤10 μm until oil overflows. Open the bleed plug and run the pump at idle until bubble-free oil flows continuously. Do not apply load until the system is confirmed air-free. Dry starting will cause catastrophic wear to the slipper and swashplate friction pair within seconds.

2. DRS Control Pilot Pressure and LS Signal Calibration

DRS control relies on accurate matching of the pressure compensator setting and Load Sensing signal (Δp). After pump or control module replacement, verify the compensator crack pressure and LS Δp relationship at rated speed and 50% displacement, confirming it falls within the factory calibration curve. LS signal line cleanliness should be maintained at NAS 8 or better. When the pump is adjusted from neutral or low operating pressure, port P must be supplied with control pressure of at least 30 bar and maximum 50 bar.

3. Precision Control for Through-Drive Series Applications

When using through-drive to connect a rear pump, strictly control rear pump weight and coaxial precision, and verify total torque and speed matching. Concentricity deviation should be within 0.05 mm, with angular deviation not exceeding 0.5°. Excessive rear pump weight can cause bearing load imbalance — add support beneath the pump body if necessary.

4. Case Drain Line Requirements

The case drain line must return to the reservoir independently, with backpressure not exceeding 2 bar. The drain line terminus should sit below the reservoir oil level to prevent air ingestion. Variable pumps with EP, HD, and DR control devices operating at neutral or working pressure < 15 bar for extended periods (>10 min) must have the housing flushed through ports T1, T2, or R.

5. Fluid Cleanliness and Viscosity Control

Maintain system cleanliness at NAS 9 or ISO 18/16/13 or better. Optimum operating viscosity is 14–50 cSt. Install a 10 μm nominal filtration element in the suction line; replace after the first 200 hours, then inspect or replace every 500 hours.