A11VO75DR/10R-NPD12N00 Rexroth Axial Piston Pump 75cc 350 bar

Product Overview

The A11VO75DR/10R-NPD12N00 is a Bosch Rexroth swashplate-type axial piston variable displacement pump from the A11VO series. With a maximum displacement of 75 cm³/rev and DR pressure control, this open-circuit pump is engineered primarily for hydrostatic drives in mobile machinery applications.

This product offers a 100% genuine OEM-interchangeable solution, manufactured to Bosch Rexroth’s original quality standards and specifications. Every unit undergoes 100% simulated working condition testing—covering rated pressure, peak pressure, and full speed range—to ensure field reliability matching original equipment performance. The pump housing is constructed from high-strength cast iron, with precision-ground friction pairs (cylinder block/valve plate and slipper/swashplate) featuring specialized surface treatments for superior wear resistance and volumetric efficiency.

The A11VO75 supports self-priming operation, pressurized tank supply, or optional built-in charge pump (impeller type). Output flow is proportional to drive speed and displacement, infinitely variable between Vg max and Vg min = 0. The 100% through-drive capability allows direct series mounting of gear pumps or axial piston pumps up to the same nominal size, eliminating the need for additional power dividers.

Technical Specifications 

• Model: A11VO75DR/10R-NPD12N00

• Manufacturer: Bosch Rexroth

• Material Number: R902006435

• Pump Type: Swashplate axial piston variable pump (open circuit)

• Size: 75

• Max Displacement (Vg max): 75 cm³/rev

• Rated Pressure: 350 bar

• Peak Pressure: 400 bar

• Maximum Speed: 2,500 rpm

• Maximum Flow Rate: 188 L/min

• Maximum Power Output: 110 kW

• Control Unit: DR pressure control

• Direction of Rotation: Clockwise (viewed from shaft end)

• Shaft End: Parallel keyed shaft, DIN 6885

• Mounting Flange: SAE J744 4-hole flange

• Port Connection: Pressure and suction ports SAE side-mounted, opposite arrangement (metric mounting threads)

• Seals: NBR

• Shaft Seal Ring: FKM

• Weight: Approx. 45–51 kg

• Through Drive: 100% through-drive capable

Key Technical Advantages

1. Precision Swashplate Design with Superior Volumetric Efficiency
The advanced swashplate axial piston design incorporates a spherical valve plate and hydrostatically supported copper-alloy slippers. This friction pair design offers self-compensating wear capability, maintaining volumetric efficiency above 94% during long-term operation. Precision machining holds critical clearance tolerances at the micron level, minimizing internal leakage and maximizing energy efficiency.

2. 100% Through-Drive Capability for Simplified System Architecture
The pump rear end supports 100% through-drive, allowing direct series mounting of gear pumps or axial piston pumps of the same nominal size. This eliminates the need for additional power dividers, significantly reducing installation space requirements and simplifying hydraulic system piping layout while lowering overall system costs.

3. DR Pressure Control with Fast, Precise Response
The DR pressure control maintains system pressure at a preset constant value regardless of flow demand fluctuations. The control valve responds rapidly with minimal pressure overshoot, ensuring smooth and precise actuator motion. The power setting can be externally adjusted while the pump is in operation, greatly enhancing on-site commissioning and maintenance convenience.

4. Low Noise Operation and Extended Service Life
Internal structural upgrades significantly reduce fluid pressure pulsation and background noise levels. Heavy-duty bearings and reinforced internal components withstand high shock loads and continuous vibration in harsh operating environments. High-precision casting and strict heat treatment processes ensure dimensional stability and fatigue resistance under extreme temperature variations.

5. Multiple Operating Modes for Maximum Versatility
Supports self-priming, pressurized tank supply, and built-in charge pump configurations. High-displacement variants can be equipped with a built-in impeller-type charge pump (A11VLO version), significantly enhancing cavitation resistance at high speeds.

Application Areas

The A11VO75DR/10R-NPD12N00 is widely deployed across the following mobile and industrial equipment sectors:

• Construction Equipment: Excavators, mobile cranes, trenchers—powers main boom movements, heavy lifting, and swing drives

• Agricultural Machinery: Harvesters, large tractors—drives auxiliary implements, steering systems, and cooling fans

• Mining & Forestry: Drilling rigs, log loaders, crushers—delivers stable high-pressure force in high-dust, high-vibration environments

• Industrial Manufacturing: Hydraulic presses, waste balers—provides precise variable flow for metal forming and clamping

• Specialty Vehicles: Concrete pump trucks, rotary drilling rigs—meets high power density and reliability requirements

Expert Maintenance Tips

1. Fluid Cleanliness Control
Strictly maintain hydraulic fluid cleanliness to ISO 4406 18/15 or higher. Replace hydraulic fluid and filter elements every 1,000–2,000 operating hours. When filling for the first time, use a 10 μm filtration unit.

2. Installation Precautions
Ensure the pump housing is completely filled with hydraulic fluid before installation—never start dry. Position the drain port higher than the pump body to prevent oil starvation in the pump chamber after shutdown, which could cause dry running and damage to core components at startup. Shaft alignment accuracy should be maintained within 0.05 mm to prevent premature bearing failure due to misalignment.

3. Piping Connection Standards
Pressure and suction ports use SAE side-mounted opposite arrangement. Thoroughly flush all piping before connection to remove metal chips, weld slag, and contaminants. The suction line must be completely leak-free to prevent air ingress and cavitation damage.

4. Regular Inspection and Maintenance
Periodically inspect pump shaft seals and the sealing condition of all connecting lines. After the first 50 hours of operation, re-torque all mounting bolts and re-verify control valve setpoints. Before restarting after extended downtime, manually rotate the shaft several revolutions to confirm smooth movement and ensure adequate lubrication.