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Rexroth A4VSO125DR/30R-PPB13N00 Hydraulic Pump
Overview
The Rexroth A4VSO125DR/30R-PPB13N00 is a high-performance axial piston variable displacement pump manufactured by Bosch Rexroth. As part of the A4VSO series, this pump features a swashplate design and is engineered for open-circuit hydraulic drive systems, delivering precise control of fluid flow and exceptional reliability in demanding industrial applications. The A4VSO series is widely recognized for its high power density, low noise operation, and very 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, ensuring efficient and reliable hydraulic power conversion. The flow is proportional to the input drive speed and displacement, and by adjusting the swashplate angle, it is possible to infinitely vary the output flow.
Nominal Displacement — The pump has a displacement of 125 cm³ per revolution, placing it in the medium-to-high flow range within the A4VSO series.
High Pressure Capacity — The pump operates at a nominal pressure of 350 bar (5,076 psi) and can withstand maximum intermittent pressures up to 400 bar (5,800 psi), making it suitable for high-pressure heavy-duty hydraulic systems.
DR Constant Pressure Control — The pump is equipped with DR (Druckregelung — pressure control) constant pressure control. When the system pressure is below the DR valve setting, the pump operates as a fixed displacement pump; 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 pressure setting range is 50 to 350 bar.
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.
Excellent Suction Performance — The A4VSO series features superior suction characteristics, ensuring reliable operation even under challenging inlet conditions and reducing the likelihood of cavitation.
Low Noise Operation — The pump features low working noise and low flow pulsation, enhancing operator comfort and supporting environmental compliance.
Long Service Life — Designed with high-quality materials, wear-resistant components, and special long-life, high-precision aviation-grade full roller bearings, the pump is built for long-term reliability in demanding industrial environments.
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 modular approach facilitates flexible system design and expansion.
N00 Configuration — The "N00" suffix indicates no auxiliary pump and no through-drive shaft extension, representing a standard configuration without through-drive.
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 oil temperature range is -15°C to +80°C, with an environmental temperature range of -15°C to +60°C, and a viscosity range of 12 to 800 mm²/s.
High Power-to-Weight Ratio — The pump offers a high power-to-weight ratio, contributing to space-saving installation and efficient system design.
Short Control Response Times — The pump features short control response times and excellent dynamic characteristics, ensuring quick and efficient operation in systems where rapid changes in flow or pressure are required.
Versatile Mounting Options — The pump features SAE and ISO standard flanges for easy integration, with optional shaft types including parallel key or splined shafts.
Key Functionalities
Variable Displacement Flow Control — The flow rate is proportional to the drive speed and displacement and can be infinitely varied by adjusting the swashplate angle, providing precise, stepless control over hydraulic output across the entire operating range.
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, focusing on controlling the direction and magnitude of fluid flow within hydraulic systems. This configuration is ideal for applications where the fluid returns to the reservoir after each cycle.
Multiple Pump Configurations — The through-drive capability allows the pump to serve as a primary unit driving secondary pumps, reducing system complexity and eliminating the need for separate couplings and mounting arrangements.
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 valves to protect the system from excess pressure, ensuring safe operation under varying load conditions.
Rapid Response Capability — With short control response times, the pump ensures rapid adaptation to changing system demands, making it suitable for dynamic hydraulic applications.
High Reliability & Low Maintenance — With its robust construction, high-quality components, and wear-resistant design, the pump ensures long-term operational stability with minimal maintenance requirements.
Application Sectors
The Rexroth A4VSO125DR/30R-PPB13N00 hydraulic pump is designed for heavy-duty industrial applications requiring high-pressure, high-power hydraulic drives with precise pressure control. The A4VSO series is widely used across a broad spectrum of industries:
| Industry Sector | Typical Applications |
|---|---|
| Steel & Metallurgy | Rolling mills, continuous casting lines, forging presses, steel mill hydraulic stations, slab handling equipment |
| Industrial Hydraulics | Hydraulic presses (oil presses, forging presses), injection molding machines, machine tool control systems |
| Ceramic & Refractory Presses | Ceramic press machines, brick presses, refractory material presses, vulcanizing presses |
| Mining Equipment | Conveyor drives, crushers, material handling systems, mining machinery, excavation equipment |
| Construction Machinery | Concrete mixers, mobile cranes, drilling equipment, graders, asphalt pavers, excavators, wheel loaders, bulldozers |
| Marine & Offshore | Ship hydraulic systems, marine winches, deck machinery, shipbuilding machinery, water conservancy and hydropower gate machinery |
| Paper Manufacturing | Paper machinery hydraulic systems |
| Petroleum & Petrochemical | Oil field machinery, petrochemical equipment |
| Railway & Tunnel Construction | Shield tunneling machinery, railway tunnel boring machines |
| Agricultural Machinery | Combine harvesters |
| Heavy-Duty Machinery | Heavy industrial machinery requiring consistent high-pressure hydraulic power |
Performance Specifications (Model-Specific)
| Specification | Value |
|---|---|
| Manufacturer | Bosch Rexroth |
| Series | A4VSO |
| Model Code | A4VSO125DR/30R-PPB13N00 |
| Pump Type | Axial piston variable displacement pump (swashplate design) |
| Circuit Type | Open circuit |
| Displacement | 125 cm³/rev |
| Nominal Pressure (Continuous) | 350 bar (5,076 psi) |
| Maximum Intermittent Pressure | 400 bar (5,800 psi) |
| Maximum Speed | 1,800 rpm |
| Control Type | DR — Constant pressure control |
| Pressure Setting Range | 50 to 350 bar |
| Rotation Direction | Clockwise (R) when viewed from shaft end |
| Shaft Type | Parallel key shaft (DIN 6885) or splined shaft |
| Mounting Type | Flange mounting (B-type ISO 4-hole) |
| Seals | NBR (nitrile rubber) with FKM shaft seal |
| Porting | PPB13N00 configuration |
| Through-Drive | N00 — No auxiliary pump, no through-drive shaft extension |
| Weight | 65–70 kg |
| Fluid Compatibility | Mineral oil-based hydraulic fluids (HLP per DIN 51524) |
| Fluid Cleanliness Requirement | ISO 4406 minimum |
| Operating Temperature Range (Oil) | -15°C to +80°C |
| Operating Temperature Range (Environment) | -15°C to +60°C |
| Viscosity Range | 12 to 800 mm²/s |
| Power-to-Weight Ratio | High |
Conclusion
The Rexroth A4VSO125DR/30R-PPB13N00 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 performance, through-drive capability, and robust construction, it delivers exceptional power density, precise flow control, and reliable operation for demanding open-circuit hydraulic systems.
The pump's variable displacement capability with DR constant pressure control ensures energy-efficient operation, while its low noise profile, high volumetric efficiency, and long service life make it an ideal solution for a wide range of industrial applications—from steel mills, forging presses, and ceramic presses to construction equipment, mining machinery, marine systems, and machine tool controls.
As a proven, reliable, and energy-efficient solution for industrial hydraulic applications worldwide, the A4VSO125DR/30R-PPB13N00 stands out as a versatile component where consistent high-pressure performance, precise pressure control, and long-term dependability are essential requirements.
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