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Rexroth A10VG45HD3D1/10L-NSC10FO23D Hydraulic Pump
Overview
The Rexroth A10VG45HD3D1/10L-NSC10FO23D is a high-performance axial piston variable displacement pump manufactured by Bosch Rexroth. As part of the A10VG series, this pump features a swashplate design and is engineered for hydrostatic transmissions in closed circuits, delivering precise control of fluid flow and exceptional reliability in demanding mobile and industrial applications. The A10VG series is widely recognized for its compact construction, high power density, and long service life.
Technical Features
Swashplate Axial Piston Design — The pump utilizes a swashplate-type axial piston variable displacement design specifically engineered for closed-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. When the swashplate passes through the neutral position, the flow direction changes smoothly, enabling seamless bidirectional operation.
HD3D Hydraulic Proportional Control — The pump is equipped with HD3D control, which is a hydraulic proportional control system that is pilot-pressure related. The pump's output flow varies infinitely between 0% and 100% in proportion to the pilot pressure difference applied to the two control signal ports (Y1 and Y2). The pilot signal from an external source is a pressure signal with negligible flow consumption, as it only acts on the control valve spool. This control valve then directs control oil to and from the stroke cylinder to adjust the pump's displacement as required. A feedback lever connected to the stroke piston maintains the pump's flow for any given pilot signal. This control mechanism provides precise, stepless adjustment of flow and direction.
Nominal Displacement & Pressure Ratings — The pump has a maximum geometric displacement of 45 cm³ per revolution. It operates at a nominal pressure of 300 bar and can withstand maximum intermittent peak pressures up to 350 bar. Some specifications indicate a nominal pressure of 350 bar and maximum pressure up to 400 bar. The pump is rated for continuous operation from 500 rpm up to 3300 rpm, with a limited maximum speed of 3550 rpm for short periods.
Integrated Boost Pump — The pump features an integrated boost pump that serves as both a feed pump and a control pump, providing both boost and pilot oil supply. This integrated design ensures reliable operation and efficiency by maintaining consistent supply of boost and pilot pressure. The maximum boost pressure is limited by an internal boost pressure relief valve. The boost pump displacement at 20 bar is 8.6 cm³ for the size 45 variant.
High-Pressure Relief Valves with Boost Function — The pump is equipped with two high-pressure relief valves on the high-pressure oil port side to prevent overloading of the hydrostatic transmission (pump and motor). These high-pressure relief valves also function as boost valves, providing additional safety and performance assurance. An additional boost pressure relief valve is also incorporated.
High Efficiency — The pump delivers high volumetric efficiency of approximately 95% and total efficiency of approximately 90%, providing excellent energy conversion efficiency. This contributes to reduced energy consumption and lower operating costs.
Long Service Life & Robust Construction — Designed with high-quality materials, a cast iron housing, and robust construction, the pump is built for long-term reliability in demanding industrial environments. The pump has a longer service life compared to other pump products, reducing the frequency of maintenance and replacement.
Low Noise Operation — The pump is designed for low noise operation, making it suitable for noise-sensitive environments while maintaining high working pressure capabilities. Low flow pulsation further contributes to smooth system operation.
Excellent Suction Characteristics — The pump features superior suction characteristics, ensuring stable performance during oil suction and reliable operation even under challenging inlet conditions.
Compact & Lightweight Design — The pump offers a compact, lightweight design per unit power, helping to reduce the weight of overall equipment and lower transportation and installation costs. The weight of the A10VG45 is approximately 27 kg.
Excellent Sealing Performance — The pump features excellent sealing performance due to the cylindrical plungers and cylinder holes, which are easy to process and achieve high matching accuracy. Internal leakage of the pump is very small, maintaining high volumetric efficiency even under high-pressure conditions.
Left-Hand Rotation — The "10L" in the model number indicates left-hand (counterclockwise) rotation when viewed from the shaft end. This ensures proper integration into hydraulic systems and compatibility with other components.
NSC10FO23D Porting Configuration — This suffix specifies the standard porting configuration for the pump, including port sizes, mounting interface, and control port arrangements.
Wide Operating Range — The pump operates effectively with mineral oil-based hydraulic fluids across a wide viscosity and temperature range. The pump body material is cast iron, and the seals are available in NBR or FKM depending on fluid compatibility requirements.
Key Functionalities
Closed-Circuit Hydrostatic Transmission — The pump is specifically designed for closed-circuit hydrostatic transmissions, where fluid is continuously recirculated between the pump and motor in a sealed loop. This configuration minimizes losses and leakage, providing high efficiency and precise power delivery for applications requiring controlled hydraulic drive.
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. By precisely controlling the angle of the swashplate, the flow rate can be optimized according to actual needs, improving the overall efficiency of the system.
Proportional Flow Control — The HD3D control system provides hydraulic proportional control where the pump's output flow is directly proportional to the pilot pressure difference applied to the control signal ports. This allows for smooth, accurate, and infinitely variable adjustments to flow and direction.
Smooth Flow Direction Changes — When the swashplate moves through the neutral position, the flow direction changes smoothly, enabling seamless bidirectional operation without abrupt transitions. This is essential for applications requiring reversible drive functionality.
Overload Protection — The dual high-pressure relief valves protect both the pump and motor from overload by limiting the maximum pressure in the high-pressure side of the hydrostatic transmission. These valves also function as boost valves, providing an additional layer of system protection and ensuring safe operation under varying load conditions.
Integrated Boost and Pilot Supply — The integrated boost pump provides both boost oil to maintain the closed circuit loop pressure and pilot oil for the control system. This eliminates the need for external pilot supply systems, simplifying system design and reducing component count.
Energy Efficient Operation — The variable displacement capability enables energy savings by allowing the pump to deliver only the flow and pressure required by the load. High volumetric efficiency (approximately 95%) and total efficiency (approximately 90%) reduce hydro-mechanical losses, minimize heat generation, and lower power consumption.
High Reliability & Low Maintenance — With its robust construction, high-quality materials, and wear-resistant components, the pump ensures long-term operational stability with minimal maintenance requirements, reducing downtime and total cost of ownership.
Application Sectors
The Rexroth A10VG45HD3D1/10L-NSC10FO23D hydraulic pump is designed for heavy-duty mobile and industrial applications requiring high-pressure, high-power hydraulic drives with precise proportional control in closed-circuit systems. The A10VG series is widely used across a broad spectrum of industries:
| Industry Sector | Typical Applications |
|---|---|
| Construction Machinery | Excavators, wheel loaders, telescopic handlers, cranes, concrete pump trucks, pavers (asphalt pavers), bulldozers |
| Rotary Drilling Rigs | Main pump for rotary drilling rigs, core drilling equipment, foundation construction machinery |
| Agricultural Machinery | Combine harvesters, tractors, self-propelled agricultural equipment requiring hydrostatic drives for wheels or tracks |
| Material Handling Equipment | Hydrostatic drives for wheels or tracks in material handling systems, conveyor drives |
| Industrial Machinery | Injection molding machines (high-pressure control for mold clamping units), blow molding equipment, plastic machinery |
| Marine & Offshore | Ship hydraulic systems, deck machinery, winches, steering gear |
| Mining Equipment | Mining machinery, material handling systems, conveyor drives |
| Steel & Metallurgy | Rolling mill hydraulic stations, continuous casting lines, metallurgical machinery |
| Ceramic & Refractory Presses | Ceramic press machines, tile presses, refractory material presses |
| Paper Manufacturing | Paper mill hydraulic systems, paper machinery |
| Petroleum & Petrochemical | Oil field machinery, drilling equipment, petrochemical processing |
| Power Generation | Coal handling systems, power plant hydraulic equipment |
Performance Specifications
| Specification | Value |
|---|---|
| Manufacturer | Bosch Rexroth |
| Series | A10VG |
| Model Code | A10VG45HD3D1/10L-NSC10FO23D |
| Pump Type | Axial piston variable displacement pump (swashplate design) |
| Circuit Type | Closed circuit (hydrostatic) |
| Displacement (Vg max) | 45 cm³/rev |
| Nominal Pressure (Continuous) | 300 bar (4,350 psi) |
| Maximum Pressure (Intermittent) | 350 bar (5,076 psi) |
| Peak Pressure Capability | Up to 400 bar (some specifications) |
| Maximum Continuous Speed | 3,300 rpm |
| Limited Maximum Speed (Short periods) | 3,550 rpm |
| Minimum Speed | 500 rpm |
| Maximum Flow Rate (at n=3300 rpm, Vg=45 cm³) | 152 L/min |
| Rated Power (at 300 bar, Vg max) | 75.9 kW |
| Torque Output (at 300 bar, Vg max) | 220 Nm |
| Torque Output (at 100 bar, Vg max) | 73.2 Nm |
| Control Type | HD3D — Hydraulic proportional control, pilot-pressure related |
| Control Signal | Pilot pressure difference applied to ports Y1 and Y2 |
| Boost Pump Displacement (at 20 bar) | 8.6 cm³ |
| Maximum Boost Pressure | 40 bar (size 45) |
| Rotation Direction | Left-hand (counterclockwise) when viewed from shaft end (10L) |
| Housing Material | Cast iron |
| Seals | NBR (standard) or FKM/Viton (optional) |
| Weight | Approx. 27 kg |
| Fluid Compatibility | Mineral oil-based hydraulic fluids, synthetic hydraulic oils |
| Operating Viscosity Range | 15–160 mm²/s |
| Operating Temperature Range | -25°C to +90°C |
| Fluid Cleanliness Requirement | ISO 4406 minimum |
| Volumetric Efficiency | ~95% |
| Total Efficiency | ~90% |
| Moment of Inertia (Rotary Group) | 0.0033 kgm² |
| Maximum Angular Acceleration | 4,000 rad/s² |
| Filling Capacity | 0.75 L |
| Rotary Stiffness (Shaft End S) | 53,404 Nm/rad |
Conclusion
The Rexroth A10VG45HD3D1/10L-NSC10FO23D 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, HD3D hydraulic proportional control, integrated boost pump, dual high-pressure relief valves with boost function, and robust cast iron construction, it delivers exceptional power density, precise flow control, and reliable operation for demanding closed-circuit hydrostatic transmission applications.
The pump's defining feature is its HD3D control system, which provides hydraulic proportional control where the output flow is infinitely variable in proportion to the pilot pressure difference applied to the control signal ports. This allows for smooth, accurate, and stepless adjustments to flow and direction, with seamless transitions when the swashplate passes through the neutral position.
With high efficiency (volumetric efficiency ~95%, total efficiency ~90%), low noise operation, a wide operating speed range from 500 to 3300 rpm, and a robust cast iron construction weighing approximately 27 kg, this pump is an ideal solution for a wide range of heavy industrial applications — from construction machinery, agricultural equipment, and material handling systems to rotary drilling rigs, injection molding machines, marine systems, mining equipment, and ceramic presses.
As a proven, reliable, and energy-efficient solution for closed-circuit hydrostatic drives worldwide, the A10VG45HD3D1/10L-NSC10FO23D stands out as a versatile component where proportional control capability, high-pressure performance, and long-term dependability are essential requirements.
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