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Rexroth A8VO120LA1KH2/72R1-NZG05F004 Hydraulic Pump
Overview
The Rexroth A8VO120LA1KH2/72R1-NZG05F004 is a high-performance axial piston variable displacement double pump manufactured by Bosch Rexroth. As part of the A8VO series (Series 61/63), this pump features a swashplate design with two axial tapered piston rotary groups and is engineered for open-circuit hydrostatic drive systems, delivering precise control of fluid flow and exceptional reliability in demanding mobile and industrial applications-2. The A8VO series is widely recognized for its high power density, low noise operation, excellent suction characteristics, and long service life.
Technical Features
Swashplate Variable Double Pump Design — The pump utilizes a swashplate-type axial piston variable displacement design with two axial tapered piston rotary groups, specifically engineered 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 between Vg max and Vg min (=0). This design enables optimal conversion of mechanical energy into hydraulic energy while providing two independent hydraulic circuits in a single compact unit-39-22.
High Displacement & Pressure Capacity — The pump has a maximum displacement of 120 cm³ per revolution, making it suitable for medium-to-high flow industrial applications. It operates at a nominal pressure of 350 bar (5,076 psi) and can withstand peak pressures up to 400 bar (5,800 psi). Some specifications indicate capability up to 450 bar intermittent pressure. The maximum speed is 2,400 rpm, with a maximum flow rate of up to 288 L/min-12-.
LA1KH2 Electronic-Hydraulic Proportional Control — The pump is equipped with LA1KH2 control, which combines hydraulic stroke limiter functionality with negative control and external pilot pressure supply. This electronic-hydraulic proportional control system supports load sensing (LS) or constant power control strategies. The pump can automatically adjust displacement and output pressure based on real-time system load demands, delivering precisely the required hydraulic power and achieving energy savings of 15–25% while effectively reducing system heat generation. The external pilot pressure is applied to port X3 to modulate power settings--36-.
Integrated Auxiliary Pump with Shared Suction Port — The pump features a built-in auxiliary pump with a pressure relief valve, serving both hydraulic circuits through a common suction port. This integrated design simplifies system architecture and ensures consistent supply of pilot and boost pressure for reliable operation-2-22.
Individual Power Control for Each Rotary Group — The two rotary groups feature individual power controllers, allowing each hydraulic circuit to be independently controlled and regulated according to its specific operational requirements. This provides exceptional flexibility for applications with multiple independent hydraulic functions-2-22.
Direct Engine Flywheel Mounting — The pump is designed for direct mounting on the flywheel housing of diesel engines, simplifying installation and improving system integration while eliminating the need for separate coupling arrangements-2-39.
Power Take-Off (PTO) Capability — The pump features a power take-off (drive output) that enables the mounting of additional axial piston pumps and gear pumps in parallel to the main pumps, allowing for flexible system expansion and multi-pump configurations without requiring separate drive units-2-22.
Excellent Suction Characteristics — The A8VO series features superior suction performance, ensuring reliable operation even under challenging inlet conditions. The suction pressure must not drop below 0.8 bar absolute. The case drain chamber is internally connected to the suction chamber, eliminating the need for a separate case drain line to the tank in many applications-2-39.
High Efficiency & Power-to-Weight Ratio — The pump delivers high volumetric efficiency (approximately 95%) and overall efficiency (approximately 90%) while maintaining an outstanding power-to-weight ratio. The compact design contributes to space-saving installation and efficient system design. The pump weighs approximately 55–60 kg-12-13.
Long Service Life & Robust Construction — Designed with high-quality materials, optimized cylinder block-piston assemblies, high-precision valve plates, and high-rigidity bearing supports, the pump is built for long-term reliability in demanding industrial environments. Key moving components receive special surface hardening treatment, improving wear resistance by over 30%. The main shaft is forged from high-strength alloy steel, providing excellent impact resistance. The fully enclosed housing structure effectively prevents external contaminant ingress-36.
Low Noise Operation — The pump is designed for low noise levels, enhancing operator comfort and supporting environmental compliance in noise-sensitive working environments-13.
Wide Operating Range — The pump operates effectively with mineral oil-based hydraulic fluids across a wide viscosity and temperature range. The maximum permissible temperature for any part of the system is 90°C. The pump can adapt to different working pressures and temperature ranges, making it suitable for a variety of industrial environments-3-13.
Multiple Control Device Options — A wide range of control instruments is available for different control and regulating functions, including LA0, LA1, load sensing controls (LA0S, LA1S, LA0KS, LA1KS), and electrical control with proportional solenoid (EP), providing flexibility for various application requirements-22.
Standardized Mounting Interface — The pump strictly follows ISO and GB installation standards, with modular design for oil ports, control circuits, and electrical interfaces, ensuring seamless integration with mainstream hydraulic system architectures both domestically and internationally-36.
72R1 Series Index — The "72R1" designation indicates Series 72 with clockwise rotation when viewed from the shaft end, ensuring proper operation and compatibility with other hydraulic components. The "R1" indicates a clockwise rotating pump intended for direct mounting on the flywheel case in diesel engines, with the main pump and auxiliary pump sharing the same rotation direction-.
NZG05F004 Configuration — This suffix specifies the standard sealing and porting configuration, with NBR seals used for standard mineral oil-based hydraulic fluid compatibility-2.
Key Functionalities
Stepless Variable Displacement — The flow rate can be infinitely varied by adjusting the swashplate angle, providing precise, stepless control over hydraulic output from zero to maximum displacement across the entire operating range. 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-39.
LA1KH2 Electronic-Hydraulic Proportional Control — The control system supports load sensing (LS) or constant power control strategies, automatically adjusting pump displacement and output pressure based on real-time load demands. The pump truly delivers "as much as needed," significantly reducing engine fuel consumption (15–25% energy savings), effectively reducing system heat generation, and extending hydraulic oil and seal life. The external pilot pressure is applied to port X3 to modulate power settings. The hydraulic stroke limiter with negative control provides precise flow management-36-.
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 mobile and industrial hydraulic systems requiring consistent and powerful operation across multiple independent circuits-2.
Independent Circuit Operation — As a variable double pump, the A8VO provides two independent hydraulic circuits in a single unit, each with its own individual power controller. This allows for simultaneous, independent operation of multiple hydraulic functions, such as separate travel and implement circuits in mobile machinery-2-22.
Direct Engine Mounting & System Integration — The pump can be mounted directly on the diesel engine flywheel housing, eliminating the need for separate couplings and mounting arrangements. This simplifies installation, reduces system complexity, and improves overall machine integration. The power take-off capability allows additional pumps to be driven in parallel-2.
Multiple Pump Configurations — The power take-off (drive output) capability allows the pump to serve as a primary unit driving secondary pumps, reducing system complexity and enabling compact, space-saving hydraulic system designs. Additional axial piston pumps or gear pumps can be mounted in parallel to the main pumps-2-22.
Energy Efficient Operation — The LA1KH2 electronic-hydraulic proportional 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, and lowers power consumption. Energy savings of 15–25% can be achieved compared to conventional fixed displacement systems-36.
Built-in System Protection — The integrated auxiliary pump includes a pressure relief valve for system protection, and optional additional pressure-reducing valves can be fitted. The high volumetric efficiency (approximately 95%) and overall efficiency (approximately 90%) contribute to reduced operating costs and improved system reliability-2-22.
Temperature Monitoring & Predictive Maintenance — The pump housing is equipped with temperature and pressure monitoring interfaces, facilitating the integration of intelligent diagnostic systems for fault early warning and predictive maintenance. This enables proactive maintenance scheduling and reduces unexpected downtime-36.
High Reliability & Low Maintenance — With its robust construction, high-quality materials, optimized design, and wear-resistant components, the pump ensures long-term operational stability with minimal maintenance requirements. The design life is extended through careful material selection and surface hardening treatments-36.
Application Sectors
The Rexroth A8VO120LA1KH2/72R1-NZG05F004 hydraulic pump is designed for heavy-duty mobile and industrial applications requiring high-pressure, high-power hydraulic drives with electronic-hydraulic proportional control and independent circuit operation. The A8VO series is widely used across a broad spectrum of industries:
| Industry Sector | Typical Applications |
|---|---|
| Rotary Drilling Rigs | Main pump for large rotary drilling rigs (e.g., SANY 180 series), core drilling rigs, geological exploration equipment, foundation construction machinery |
| Construction Machinery | Excavators, wheel loaders, bulldozers, concrete pump trucks, cranes, drilling equipment |
| Mining Machinery | Mining excavators, loaders, material handling systems, mineral processing equipment capable of withstanding high loads and harsh working environments |
| Agricultural Machinery | Combine harvesters, tractors, self-propelled agricultural equipment requiring high-pressure hydraulics |
| Industrial Equipment | CNC machine tools, die-casting machines, plastic injection molding machinery requiring stable hydraulic power |
| Marine & Offshore | Ship hydraulic systems, steering gear, anchor winches, deck machinery |
| Metallurgy & Steel | Steel mill hydraulic systems, rolling mills, continuous casting equipment |
| Aerospace | Aerospace ground support equipment, test stands |
| Petroleum & Petrochemical | Oil field machinery, drilling equipment, petrochemical processing |
| Power Generation | Power plant hydraulic systems, coal handling equipment |
| Ceramic Industry | Ceramic press machines, tile presses, refractory presses |
Performance Specifications (Model-Specific)
| Specification | Value |
|---|---|
| Manufacturer | Bosch Rexroth |
| Series | A8VO (Series 61/63) |
| Model Code | A8VO120LA1KH2/72R1-NZG05F004 |
| Material Number (MNR) | R971049321 |
| Pump Type | Axial piston variable displacement double pump (swashplate design) |
| Circuit Type | Open circuit |
| Displacement (Vg max) | 120 cm³/rev |
| Nominal Pressure (Continuous) | 350 bar (5,076 psi) |
| Peak Pressure (Intermittent) | 400 bar (5,800 psi) |
| Maximum Intermittent Pressure (Some specs) | 450 bar (6,525 psi) |
| Maximum Speed | 2,400 rpm |
| Maximum Flow Rate | 288 L/min |
| Control Type | LA1KH2 — Electronic-hydraulic proportional control with hydraulic stroke limiter, negative control, and external pilot pressure supply |
| Control Features | Load sensing (LS) or constant power control strategies |
| External Pilot Port | Port X3 |
| Energy Savings | 15–25% |
| Rotation Direction | Clockwise (72R1 — Series 72, clockwise rotation, main pump and auxiliary pump share same rotation) |
| Mounting Type | Direct engine flywheel housing mounting |
| Power Take-Off | Available for mounting additional axial piston and gear pumps |
| Suction Port | Common suction port for auxiliary pump and both circuits |
| Auxiliary Pump | Built-in with pressure relief valve |
| Seals | NBR (standard for mineral oil compatibility) |
| Housing Material | Cast iron |
| Weight | 55–60 kg |
| Fluid Compatibility | Mineral oil-based hydraulic fluids (HLP per DIN 51524) |
| Maximum System Temperature | 90°C |
| Minimum Suction Pressure | 0.8 bar absolute |
| Volumetric Efficiency | ~95% |
| Overall Efficiency | ~90% |
| Installation Standards | ISO and GB standard mounting interfaces |
| Additional Features | Temperature/pressure monitoring interfaces for predictive maintenance |
| Key Wear Resistance | Special surface hardening on critical components (30%+ improvement) |
Conclusion
The Rexroth A8VO120LA1KH2/72R1-NZG05F004 is a high-performance axial piston variable displacement double pump that exemplifies Bosch Rexroth's decades of expertise in hydraulic drive technology. With its advanced swashplate design, LA1KH2 electronic-hydraulic proportional control, integrated auxiliary pump, individual power control for each rotary group, 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 defining feature is its LA1KH2 electronic-hydraulic proportional control system, which provides load sensing or constant power control strategies with hydraulic stroke limiter functionality and external pilot pressure supply. This enables the pump to automatically adjust displacement and output pressure based on real-time load demands, delivering precisely the required hydraulic power while achieving 15–25% energy savings, reducing system heat generation, and extending component life.
As a variable double pump, the A8VO120 provides two independent hydraulic circuits in a single unit, each with its own individual power controller, making it ideal for mobile machinery requiring simultaneous, independent operation of multiple hydraulic functions such as travel and implement circuits. The direct engine flywheel mounting and power take-off capability simplify installation and enable flexible system expansion.
With high pressure capability (nominal 350 bar, peak 400 bar), excellent suction characteristics, low noise operation, high volumetric efficiency (approximately 95%), and robust construction featuring special surface hardening for wear resistance, this pump is an ideal solution for a wide range of heavy industrial applications — from rotary drilling rigs, construction machinery, and mining equipment to agricultural machinery, marine systems, and industrial machinery.
As a proven, reliable, and energy-efficient solution for open-circuit hydrostatic drives worldwide, the A8VO120LA1KH2/72R1-NZG05F004 stands out as a versatile component where electronic-hydraulic proportional control, independent dual-circuit operation, high-pressure performance, and long-term dependability are essential requirements.
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