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Rexroth A10VSO71DFR1/31R-PPA12N00-S149 Hydraulic Pump
Overview
The Rexroth A10VSO71DFR1/31R-PPA12N00-S149 is a high-performance axial piston variable displacement pump manufactured by Bosch Rexroth. As part of the 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. The A10VSO series is widely recognized for its high power density, excellent suction characteristics, low noise operation, and long service life -1-8.
Technical Features
Swashplate Axial Piston Design — The pump utilizes a swashplate-type axial piston variable displacement design specifically tailored for open-circuit hydrostatic transmissions. 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 -1-6.
DFR1 Pressure and Flow Control (Load Sensing) — The pump is equipped with DFR1 control, which combines pressure compensation with flow control (load sensing). The X-port is plugged in this configuration, and the control operates by maintaining a constant pressure difference between the pump outlet and the load-sensing signal. When the system pressure reaches the set maximum, the pump automatically reduces its displacement to a low-flow standby state. The "1" in DFR1 indicates that there is no orifice in the X oil line. This DFR1 control system enables the pump to match output precisely to system demand, significantly reducing energy waste and heat generation -6-8.
Nominal Displacement & Pressure Ratings — The pump has a maximum geometric displacement of 71 cm³ per revolution -5. 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 156 L/min at 2,200 rpm, and the rated power is 73 kW at nominal pressure -1-5-8.
Excellent Suction Performance — The A10VSO series features superior suction characteristics, ensuring reliable operation even under challenging inlet conditions and reducing the likelihood of cavitation. The pump possesses good self-priming ability and strong anti-cavitation performance, enabling reliable operation at lower inlet pressures -1-7.
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. Optimized fluid dynamics significantly reduce operating noise -1-7-9.
Long Service Life & Robust Construction — Designed with high-quality materials, a robust cast iron construction, and wear-resistant components, the pump is built for long-term reliability in demanding environments. High-precision matching and grinding of piston components (radial clearance only 0.002-0.003mm) combined with heat treatment processes ensure long-term stable operation -7-8.
Short Control Response Times — The pump features short control response times and rapid pressure/flow adjustment, ensuring rapid adaptation to changing system demands and precise operation in dynamic hydraulic applications requiring accurate control -6-7-8.
High Power-to-Weight Ratio — The pump offers an excellent power-to-weight ratio, contributing to space-saving installation and efficient system design. The pump weighs approximately 35.2 kg -5-7.
High Drive Shaft Load Capacity — The drive shaft can simultaneously withstand axial and radial loads, simplifying transmission system design and eliminating the need for additional bearing support -7-8.
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 -6-8.
Standardized Mounting & Porting — The pump features an ISO 2-hole mounting flange (ISO 3019-1 / SAE J744 Type A) with a parallel key shaft (DIN 6885). The porting configuration includes SAE flange ports located on opposite sides with metric mounting screws. Two case drain ports are provided for convenient installation -6-8.
NBR Seals with FKM Shaft Seal — The pump is equipped with NBR (nitrile rubber) seals for the housing and an FKM (fluoroelastomer) shaft seal (designated by the "P" in the model code), ensuring compatibility with standard mineral oil-based hydraulic fluids -6-8.
No Through-Drive — The N00 designation indicates that this specific configuration does not include a through-drive shaft extension. However, 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, allowing for multi-circuit system configurations -6-8.
S149 Special Configuration — The S149 suffix indicates a special configuration variant within the A10VSO series, customized for specific OEM requirements or application conditions -1-2-3.
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, achieving precise proportional control of flow rate with drive speed and displacement -1-6-7.
Load-Sensing Control — The DFR1 control system provides load-sensing functionality, where the pump automatically adjusts its displacement to maintain a constant pressure difference between the pump outlet and the load. This ensures that the pump delivers only the flow required by the actuator, minimizing overflow losses and improving system efficiency -6-7.
Pressure Cut-Off — The DR pressure compensation function provides a pressure cut-off limit. When the system pressure reaches the set maximum (350 bar peak), the pump automatically reduces its displacement to a low-flow state, protecting the system from overpressure conditions and reducing energy consumption -7-8.
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 -1-8.
Energy Efficient Operation — The DFR1 load-sensing control ensures that the pump delivers only the power required by the load, automatically adjusting displacement in response to system demands. This reduces hydro-mechanical losses, minimizes heat generation, lowers power consumption, and contributes to significant energy savings compared to fixed displacement systems -7-8.
High Volumetric Efficiency — The pump delivers high volumetric efficiency, with high-precision machining of piston components ensuring minimal internal leakage. This contributes to overall system efficiency and reduced operating costs -4-7.
High Reliability & Low Maintenance — With its robust construction, high-quality materials, wear-resistant components, and proven design, the pump ensures long-term operational stability with minimal maintenance requirements, reducing downtime and total cost of ownership -7-8.
Application Sectors
The Rexroth A10VSO71DFR1/31R-PPA12N00-S149 hydraulic pump is designed for medium-to-high pressure industrial and mobile applications requiring reliable hydraulic power with load-sensing control. The A10VSO series is widely used across a broad spectrum of industries -7-8:
| Industry Sector | Typical Applications |
|---|---|
| Industrial Hydraulic Systems | Hydraulic power sources for machine tools, presses, test rigs, and various industrial machinery requiring stable and reliable pressure and flow |
| Mobile Machinery | Construction machinery (excavators, loaders, concrete pump trucks), agricultural machinery (combine harvesters, tractors), and other mobile equipment hydraulic transmission systems |
| Machining Equipment | Metal cutting machine tools, forming machine tools requiring high-precision and high-response hydraulic control |
| Plastics & Die-casting Machinery | Injection molding machines, die-casting machines for mold closing and injection control requiring precise pressure and flow regulation |
| Metallurgical Equipment | Rolling mills, metallurgical furnaces capable of withstanding harsh conditions such as high temperatures and high dust levels |
| Marine & Offshore | Ship steering gear, anchor winches, hatch covers, and offshore platform equipment hydraulic systems |
| Mining & Construction | Mining drilling rigs, heavy construction equipment requiring high-pressure, high-flow power |
| New Energy Equipment | Hydraulic drive and regulation devices in wind power systems and solar tracking systems |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Bosch Rexroth |
| Series | A10VSO, Series 31 |
| Model Code | A10VSO71DFR1/31R-PPA12N00-S149 |
| Pump Type | Axial piston variable displacement pump (swashplate design) |
| Circuit Type | Open circuit |
| Displacement (Vg max) | 71 cm³/rev |
| Nominal Pressure (Continuous) | 280 bar (4,060 psi) |
| Maximum Pressure (Intermittent) | 350 bar (5,076 psi) |
| Maximum Speed (at Vg max) | 2,200 rpm |
| Maximum Flow Rate | 156 L/min |
| Flow Rate at 1,500 rpm | 107 L/min |
| Rated Power (at nominal pressure, full flow) | 73 kW |
| Power at 1,500 rpm | 50 kW |
| Torque Output (at nominal pressure) | 316 Nm |
| Control Type | DFR1 — Pressure and flow control (load sensing, X-port plugged, no orifice) |
| Rotation Direction | Clockwise (R) when viewed from shaft end |
| Shaft Type | Parallel key shaft (DIN 6885) |
| Mounting Type | ISO 3019-1 (SAE J744 Type A), 2-hole flange |
| Porting Configuration | PPA12N00 |
| Through-Drive | N00 — Without through-drive |
| Seals | NBR housing / FKM shaft seal |
| Housing Material | Cast iron |
| Weight | 35.2 kg |
| Fluid Compatibility | Mineral oil-based hydraulic fluids (HLP per DIN 51524) |
| Fluid Cleanliness Requirement | ISO 4406 minimum (recommended 18/16/13 or better) |
| Minimum Suction Pressure | 0.8 bar absolute |
| Special Configuration | S149 — Customized variant |
Conclusion
The Rexroth A10VSO71DFR1/31R-PPA12N00-S149 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, DFR1 load-sensing 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 DFR1 control system is its defining feature, providing integrated load-sensing and pressure cut-off functionality. This ensures that the pump delivers only the flow required by the load, maintaining a constant pressure difference while automatically reducing displacement when the set maximum pressure is reached. The absence of an orifice in the X oil line (indicated by the "1" in DFR1) provides specific control characteristics suited for applications where the load-sensing signal line requires direct connection without flow restriction. This load-sensing capability makes the pump particularly well-suited for applications where energy efficiency and precise flow control are critical, such as machine tools, hydraulic presses, and mobile equipment.
With a displacement of 71 cm³, nominal pressure of 280 bar, peak pressure up to 350 bar, maximum speed of 2,200 rpm, maximum flow of 156 L/min, and a compact 35.2 kg cast iron construction, this pump is an ideal solution for a wide range of medium-to-high pressure applications — from industrial machinery, machine tools, and hydraulic presses to construction equipment, agricultural machinery, marine systems, and metallurgical equipment.
As a proven, reliable, and energy-efficient solution for open-circuit hydrostatic drives worldwide, the A10VSO71DFR1/31R-PPA12N00-S149 stands out as a versatile component where load-sensing control, high-pressure performance, and long-term dependability are essential requirements.
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