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Rexroth A10VSO100DR/31R-VPA12N00 Hydraulic Pump
Overview
The Rexroth A10VSO100DR/31R-VPA12N00 (Material Number R902566701) is a high-performance axial piston variable displacement pump manufactured by Bosch Rexroth. As part of the proven A10VSO Series 31, this pump features a swashplate design and is engineered for open-circuit hydraulic systems, delivering precise control of fluid flow and exceptional reliability in demanding industrial and mobile applications.
Technical Features
Swashplate Axial Piston Design — The pump utilizes a swashplate-type axial piston variable displacement design specifically tailored for open-circuit hydrostatic drives. The flow output is proportional to the input drive speed and displacement volume, and by adjusting the swashplate angle, output flow can be infinitely varied from zero to maximum displacement.
Nominal Displacement & Pressure Ratings — The pump has a maximum geometric displacement of 100 cm³ per revolution. It operates at a nominal pressure of 280 bar (4,060 psi) and can withstand maximum intermittent pressures up to 350 bar (5,076 psi). The maximum flow rate is 150 L/min.
DR Constant Pressure Control — The pump is equipped with DR constant pressure control. This control mechanism maintains a stable system pressure regardless of load variations. When the system pressure is below the DR valve setting, the pump operates at full displacement; when the set pressure is reached, the DR valve activates, reducing displacement to maintain constant pressure and supply only the oil volume required by the system. The DRG variant indicates that remote pressure control capability is supported.
Robust Construction & High Power-to-Weight Ratio — The pump features a compact cast iron housing with ISO 3019-2 (metric) 2-hole mounting flange and an ISO shaft key. It has a weight of approximately 50 kg and is designed to withstand both axial and radial loads on the drive shaft. FKM sealing material is used as standard, ensuring compatibility with a wide range of hydraulic fluids.
Excellent Suction Performance — The A10VSO series features superior suction characteristics with a minimum absolute inlet pressure requirement of 0.8 bar to prevent cavitation. The pump features two case drain ports, ensuring reliable operation even under challenging inlet conditions.
Low Noise Operation — The pump is designed for low operating noise with low pressure pulsation, enhancing operator comfort and supporting environmental compliance in noise-sensitive industrial environments.
Long Service Life & High Reliability — Designed with high-quality materials, a robust cast iron construction, and wear-resistant components featuring a hydraulically balanced oil film thickness design enabling pure liquid friction between the cylinder block and the oil distribution plate, the pump is built for long-term reliability in demanding environments.
Short Control Response Times — The pump features short control response times, ensuring rapid adaptation to changing system demands and precise operation in dynamic hydraulic applications.
Clockwise Rotation — The pump is designed for clockwise rotation when viewed from the shaft end, denoted by the "R" in its model code, ensuring proper operation and compatibility with other hydraulic components.
Through-Drive Capability — While this specific configuration does not include a through-drive (N00), the A10VSO series supports through-drive capability for mounting additional pumps up to the same nominal size when specified with an appropriate through-drive option, enabling compact system expansion.
Wide Operating Range — The pump operates effectively with mineral oil-based hydraulic fluids (HLP according to DIN 51524) across a wide viscosity and temperature range. The recommended operating viscosity range is 16–36 mm²/s, with a viscosity limit of 10 mm²/s to 1000 mm²/s short-term. The oil temperature range is -25°C to +90°C.
Good Self-Priming Capability — The pump has good self-priming characteristics, enabling reliable operation without the need for an external charge pump in many applications. It can be mounted above the tank with a suction height not exceeding 0.5 m.
Key Functionalities
Stepless Variable Displacement — The flow rate can be infinitely varied by adjusting the swashplate angle, providing precise, stepless control over hydraulic output across the entire operating range from zero to maximum displacement. This allows the pump to optimize flow according to actual needs, improving overall system efficiency.
Constant Pressure Regulation — The DR pressure compensator maintains a constant system pressure regardless of load variations. When the pump reaches the set pressure, the controller reduces displacement to match system demand, ensuring stable performance and protecting downstream components. The variable pump delivers only the hydraulic oil required by the consumer, minimizing energy waste.
Open-Circuit Hydrostatic Transmission — The pump is specifically designed for open-circuit operation, where fluid returns to the reservoir after each cycle, making it ideal for industrial and mobile hydraulic systems requiring consistent and powerful operation.
Energy Efficient Operation — The DR constant pressure control enables energy savings compared to fixed displacement pumps in dynamic load scenarios, reducing hydro-mechanical losses, heat generation, and power consumption.
Overload Protection — The pump incorporates built-in high-pressure relief protection. When the system pressure reaches the set maximum (350 bar peak), the pump automatically reduces displacement, ensuring safe operation under varying load conditions.
High Reliability & Low Maintenance — With its robust construction, high-quality materials, wear-resistant components, and proven design featuring hydraulically balanced oil film thickness for pure liquid friction, the pump ensures long-term operational stability with minimal maintenance requirements.
Application Sectors
The Rexroth A10VSO100DR/31R-VPA12N00 hydraulic pump is designed for heavy-duty industrial and mobile applications requiring high-pressure, high-power hydraulic drives with precise constant pressure control. The A10VSO series is widely used across a broad spectrum of industries:
| Industry Sector | Typical Applications |
|---|---|
| Industrial Machinery | Injection molding machines, hydraulic presses, die-casting machines requiring stable and reliable pressure and flow |
| Machine Tools | CNC machine tools, heavy-duty machining centers requiring precise hydraulic control |
| Metallurgy & Steel | Steel mill hydraulic systems, rolling mills, continuous casting lines, forging presses |
| Mining Equipment | Mining machinery, excavators, material handling systems requiring high-pressure hydraulic power |
| Construction Machinery | Excavators, loaders, concrete pump trucks, construction equipment requiring reliable hydraulic power |
| Marine & Offshore | Ship hydraulic systems, deck machinery, steering gear, marine equipment |
| Mobile Hydraulics | Cranes, heavy transport machinery, self-propelled equipment |
| Energy Sector | Oil and gas equipment, power generation systems |
| Agricultural Machinery | Heavy agricultural equipment requiring high-pressure hydraulics |
| Ceramic Industry | Ceramic press machines, tile presses, brick presses |
| Paper Manufacturing | Paper mill hydraulic systems |
| Hydraulic Systems | Machine tools, metallurgical equipment, forging, mining and lifting machinery, agricultural machinery, ship engineering |
| General Industry | Test rigs, industrial automation requiring precise pressure control |
| Aerospace | Aerospace ground support equipment, hydraulic test stands |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Bosch Rexroth |
| Model Code | A10VSO100DR/31R-VPA12N00 |
| Material Number | R902566701 |
| Pump Type | Axial piston variable displacement pump (swashplate design) |
| Circuit Type | Open circuit |
| Displacement (Vg max) | 100 cm³/rev |
| Nominal Pressure (Continuous) | 280 bar (4,060 psi) |
| Maximum Pressure (Intermittent) | 350 bar (5,076 psi) |
| Maximum Speed | 2,500 rpm (continuous), 1,500 rpm (nominal) |
| Maximum Flow Rate | 150 L/min |
| Control Type | DR — Constant pressure control (remote pressure control supported) |
| Rotation Direction | Clockwise (R) when viewed from shaft end |
| Shaft Type | ISO shaft key |
| Mounting Type | ISO 3019-2 (metric), 2-hole flange |
| Through-Drive | Without through drive |
| Seals | FKM (fluoroelastomer) standard |
| Housing Material | Cast iron |
| Weight | 49–50 kg |
| Fluid Compatibility | Mineral oil-based hydraulic fluids (HLP per DIN 51524) |
| Recommended Viscosity Range | 16–36 mm²/s (optimal), 10–1000 mm²/s short-term |
| Operating Temperature Range (Oil) | -25°C to +90°C |
| Operating Temperature Range (Environment) | 30-90°C |
| Maximum Leakage Oil Temperature | 90°C |
| Minimum Suction Pressure (absolute) | 0.8 bar |
| Case Drain Ports | Two |
| Self-Priming Capability | Yes |
Conclusion
The Rexroth A10VSO100DR/31R-VPA12N00 is a high-performance axial piston variable displacement pump that exemplifies Bosch Rexroth's decades of expertise in hydraulic drive technology. With its advanced swashplate design, DR constant pressure control, excellent suction characteristics, and robust cast iron construction, it delivers exceptional power density, precise flow control, and reliable operation for demanding open-circuit hydraulic systems.
The pump's DR constant pressure control system is its defining feature, providing reliable pressure cut-off and stable system pressure regulation. This ensures that the pump delivers only the flow required by the system at the set pressure, maintaining energy-efficient operation while protecting downstream components and the prime mover from overpressure conditions.
With a displacement of 100 cm³, nominal pressure of 280 bar, peak pressure up to 350 bar, maximum flow of 150 L/min, and a compact 50 kg cast iron construction, this pump is an ideal solution for a wide range of high-power industrial applications — from injection molding machines, hydraulic presses, and steel mills to mining equipment, marine systems, construction machinery, and energy sector applications.
As a proven, reliable, and energy-efficient solution for open-circuit hydrostatic drives worldwide, the A10VSO100DR/31R-VPA12N00 stands out as a versatile component where constant pressure control, high-pressure performance, and long-term dependability are essential requirements.
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