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Rexroth AA10VSO28DFR1/31R-PPA12N00 Hydraulic Pump
Overview
The Rexroth AA10VSO28DFR1/31R-PPA12N00 (Material Number R910910590) 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.
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 .
DFR1 Pressure and Flow Control (Load Sensing) — The pump is equipped with DFR1 control, which combines pressure compensation with flow control (load sensing) . The "1" in DFR1 indicates that there is no orifice in the X oil line. This 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. This DFR1 control system enables the pump to match output precisely to system demand, significantly reducing energy waste and heat generation.
Nominal Displacement & Pressure Ratings — The pump has a maximum geometric displacement of 28 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).
Excellent Suction Performance — The A10VSO series features superior suction characteristics, ensuring reliable operation even under challenging inlet conditions and reducing the likelihood of cavitation . This promotes consistent fluid flow and enhances overall system performance, with high resistance to cavitation and sudden drops in suction or housing pressure .
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 & 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 . The drive shaft can withstand both axial and radial loads .
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 requiring accurate control .
High Power-to-Weight Ratio — The pump offers an excellent power-to-weight ratio, contributing to space-saving installation and efficient system design -5-8. The pump weight is approximately 30 kg .
Through-Drive Capability — The pump features through-drive capability, allowing for the mounting of additional pumps up to the same nominal size directly onto it without requiring separate coupling mechanisms . This allows for versatile multi-circuit system configurations.
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 .
Standardized Mounting & Porting — The pump features an SAE 2-bolt mounting flange (ISO 3019-2) with a splined shaft (SAE J744). The porting configuration includes SAE flange ports located on opposite sides with metric mounting screws -8. Two case drain ports are provided for convenient installation .
NBR Seals — The pump is equipped with NBR (nitrile rubber) seals, ensuring compatibility with standard mineral oil-based hydraulic fluids
Wide Operating Range — The pump operates effectively with mineral oil-based hydraulic fluids across a wide viscosity and temperature range, with an applicable temperature range of 30-90°C .
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.
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 -5. This ensures that the pump delivers only the flow required by the actuator, minimizing overflow losses and improving system efficiency.
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.
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.
Multiple Pump Configurations — The through-drive capability allows the pump to serve as a primary unit driving secondary pumps (gear pumps or axial piston pumps up to the same nominal size), reducing system complexity and enabling compact, space-saving hydraulic system designs.
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 -1. This reduces hydro-mechanical losses, minimizes heat generation, lowers power consumption, and contributes to significant energy savings compared to fixed displacement systems. Overall efficiency is high with low pressure pulsation.
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.
Application Sectors
The Rexroth AA10VSO28DFR1/31R-PPA12N00 hydraulic pump is designed for medium-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 :
| Industry Sector | Typical Applications |
|---|---|
| Industrial Hydraulics | Machine tools, hydraulic presses, test rigs, injection molding machines requiring stable and reliable pressure and flow |
| Construction Machinery | Excavators, cranes, concrete pump trucks, small to medium construction equipment |
| Agricultural Machinery | Combine harvesters, tractors, self-propelled agricultural equipment |
| Material Handling Equipment | Forklifts, pallet trucks, conveyor systems requiring precise hydraulic control |
| Mining Equipment | Mining machinery, material handling systems requiring efficient hydraulic power |
| Marine & Offshore | Ship hydraulic systems, deck machinery, steering gear |
| Ceramic Industry | Ceramic press machines, tile presses, brick presses |
| General Industry | Industrial automation systems requiring precise hydraulic actuation |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Bosch Rexroth |
| Series | A10VSO, Series 31 |
| Model Code | AA10VSO28DFR1/31R-PPA12N00 |
| Material Number | R910910590 |
| Pump Type | Axial piston variable displacement pump (swashplate design) |
| Circuit Type | Open circuit |
| Displacement (Vg max) | 28 cm³/rev |
| Nominal Pressure (Continuous) | 280 bar (4,060 psi) |
| Maximum Pressure (Intermittent) | 350 bar (5,076 psi) |
| Control Type | DFR1 — Pressure and flow control (load sensing) |
| Rotation Direction | Clockwise (R) when viewed from shaft end |
| Shaft Type | Splined shaft SAE J744 |
| Mounting Type | SAE 2-bolt flange (ISO 3019-2) |
| Porting Configuration | PPA12N00 — SAE flange ports, opposite side, metric screws |
| Through-Drive | Capable (for mounting additional pumps up to same size) |
| Seals | NBR (nitrile rubber) |
| Housing Material | Cast iron |
| Weight | Approx. 30 kg |
| Fluid Compatibility | Mineral oil-based hydraulic fluids (HLP per DIN 51524) |
| Operating Temperature Range | 30-90°C |
| Fluid Cleanliness Requirement | ISO 4406 minimum (recommended 18/16/13 or better) |
| Case Drain Ports | Two |
Conclusion
The Rexroth AA10VSO28DFR1/31R-PPA12N00 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, through-drive capability, 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. 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 28 cm³, nominal pressure of 280 bar, peak pressure up to 350 bar, and a compact cast iron construction weighing approximately 30 kg, this pump is an ideal solution for a wide range of medium-pressure applications — from industrial machinery, machine tools, and hydraulic presses to construction equipment, agricultural machinery, and material handling systems .
As a proven, reliable, and energy-efficient solution for open-circuit hydrostatic drives worldwide, the AA10VSO28DFR1/31R-PPA12N00 stands out as a versatile component where load-sensing control, high-pressure performance, low noise operation, and long-term dependability are essential requirements.
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