Product Overview
The A7V080LRH1/61R-PZB01 is a Bosch Rexroth A7VO Series size 63 bent-axis axial piston variable displacement pump with a nominal displacement of 80 cm³/rev, nominal operating pressure of 350 bar (5100 psi), and peak pressure capability of 400 bar (40 MPa). Designed for hydrostatic drives in open circuits, the pump features a bent-axis design with axial tapered piston rotary group, delivering output flow proportional to drive speed and displacement, with stepless variation via bent-axis angle adjustment.
This model is equipped with the LRH1 constant power controller (with hydraulic stroke limiter, negative control, Δp = 25 bar), enabling continuous change or limitation of pump displacement across the entire control range through the hydraulic stroke limiter, achieving precise power management.The LRH1 control mode is suitable for applications requiring drive power limitation, such as travel drive systems in Liebherr wheel loaders and rotary drilling rigs.
The A7VO series pumps are characterized by compact construction, robust durability, and long service life, featuring a high-strength cast iron housing, high-performance rotary group, and optimized port plate flow passages.The pump is widely deployed in construction machinery, mining equipment, and marine hydraulic systems for both mobile and stationary applications.
The companion model A7V028DRG/63L-NZB01-S is a 28 cm³/rev displacement DRG remote-controlled pressure compensator configuration, suitable for small-to-medium power hydraulic systems requiring remote pressure adjustment. Both belong to the A7VO series, enabling system integration solutions covering different displacement and control requirements.
Every A7V080LRH1/61R-PZB01 undergoes 100% simulated duty-cycle testing prior to shipment — covering pressure holding, flow output, control response, and internal leakage — ensuring complete drop-in interchangeability with original Rexroth pumps without installation or plumbing modifications.
Technical Specifications
Model: A7V080LRH1/61R-PZB01
Brand: Bosch Rexroth
Series: A7VO Series 63
Pump Type: Open-circuit bent-axis axial piston variable displacement pump
Nominal Displacement: 80 cm³/rev
Nominal Operating Pressure: 350 bar (35 MPa / 5100 psi)
Peak Pressure: 400 bar (40 MPa / 5800 psi)
Maximum Speed: 2240 rpm
Control Type: LRH1 constant power control (with hydraulic stroke limiter, negative control, Δp = 25 bar)
Circuit Type: Open circuit
Direction of Rotation: Right-hand (R, clockwise viewed from shaft end)
Seals: P (NBR Nitrile)
Shaft Type: Z (standard keyed shaft)
Mounting Flange: B (standard mounting flange)
Working Ports: 01 (standard port configuration)
Housing Material: High-strength cast iron
Weight: Approx. 40 kg
Fluid Compatibility: Mineral-based hydraulic oil (HLP series recommended)
Fluid Cleanliness Requirement: ISO 18/16/13 or better
Operating Temperature Range: 30–90 ℃
Companion Model Reference:
Model: A7V028DRG/63L-NZB01-S
Series: A7VO Series 63
Nominal Displacement: 28.1 cm³/rev
Control Type: DRG remote-controlled pressure compensator
Direction of Rotation: Left-hand (L)
Seals: N (NBR Nitrile)
Shaft Type: Z (standard keyed shaft)
Mounting Flange: B (standard mounting flange)
Working Ports: 01 (standard port configuration)
Key Technical Advantages
1. Bent-Axis Design — High Volumetric Efficiency and Self-Centering
The A7V080LRH1/61R-PZB01 employs a bent-axis design with axial tapered piston rotary group, in which the cylinder and port plate utilize spherical porting for automatic self-centering during rotation, resulting in low peripheral speed and high volumetric efficiency. The bent-axis configuration offers a larger displacement range and higher power density compared to swashplate designs, particularly suitable for medium-displacement applications of 80 cm³/rev and above. The spherical porting design maintains excellent port plate contact under high pressure, reducing internal leakage and extending service life.
2. LRH1 Constant Power Control — Precise Power Management
The LRH1 controller is a constant power control with hydraulic stroke limiter (negative control), enabling continuous change or limitation of pump displacement across the entire control range through the hydraulic stroke limiter.The LRH1 control mode ensures that drive power does not exceed the set value at constant drive speed, achieving optimal power utilization through a hyperbolic pressure-displacement control characteristic. The control start pressure setting range is 50 bar to 350 bar with a differential pressure Δp = 25 bar.This control mode is particularly suitable for mobile machinery applications requiring engine power output limitation under variable load conditions.
3. Compact Structure and High Power Density
The A7VO series pumps are renowned for their short construction length and robust design.The A7V080LRH1/61R-PZB01 weighs approximately 40 kg at 80 cm³/rev displacement, with power density leading among comparable bent-axis pumps. The compact structural design provides exceptional adaptability within the limited installation space of construction machinery, while the high-strength cast iron housing ensures long-term reliability under heavy-duty and vibration-prone conditions.
4. Exceptional Field Interchangeability and Media Compatibility
The A7V080LRH1/61R-PZB01 features mounting flange (B), shaft specifications (Z), and port layouts conforming to Rexroth A7VO Series size 63 standards, enabling drop-in interchangeability with other A7VO80 models of the same specification. The pump is compatible with mineral-based hydraulic oil, with NBR seals suitable for standard industrial hydraulic systems. Original Rexroth A7VO pumps can be directly replaced without modifying system installation interfaces or plumbing layouts.
5. Wide Application in Mobile and Stationary Hydraulic Systems
The A7VO series pumps are designed for hydrostatic drives in open circuits, with output flow proportional to drive speed and displacement, and stepless variation via bent-axis adjustment.The pump is suitable for both mobile construction machinery travel drive systems and stationary industrial hydraulic power units, demonstrating exceptional adaptability across diverse operating conditions. The companion A7V028DRG/63L-NZB01-S with DRG remote-controlled pressure compensator configuration is suitable for small-to-medium displacement systems requiring remote pressure adjustment, enabling multi-pump system integration with the A7V080.
Application Areas
Wheel Loaders: Liebherr and other large loader travel drive hydraulic systems, LRH1 constant power control enabling engine power matching
Rotary Drilling Rigs: Main winch and power head drive hydraulic systems
Road Rollers and Pavers: Travel drive and vibration hydraulic systems
Mining Dump Trucks: Travel drive hydrostatic transmission systems
Marine and Offshore: Deck machinery and winch hydraulic systems
Industrial Hydraulic Power Units: Open-circuit power sources for metallurgical equipment and test benches
Machine Tools and Injection Molding Machines: Hydraulic power units leveraging stepless variable displacement for energy-saving operation
The A7V080LRH1/61R-PZB01 is ideally suited for medium-to-large power open-circuit hydraulic systems requiring 350 bar continuous working pressure and displacements in the 80 cm³/rev range — the classic configuration for construction machinery travel drives and industrial hydraulic power units.
Expert Maintenance Tips
1. Shaft Alignment and Coupling Requirements
Maintain concentricity between the pump shaft and drive shaft within 0.05 mm. Flexible couplings are strongly recommended to accommodate minor angular misalignment. The A7V080LRH1/61R-PZB01 weighs approximately 40 kg — use appropriate lifting equipment during installation and never strike the shaft end. Tighten mounting flange bolts in diagonal sequence to the specified torque to ensure uniform flange loading.
2. Pre-Start Priming Procedure
Before initial startup, the pump must be slowly filled through the case drain port with clean hydraulic oil to ensure adequate lubrication, cooling, and sealing during startup. Start the pump in jog mode until the pump and piping are sufficiently filled and vented. After complete venting, run at low pressure for 5–10 minutes, check piping and component tightness, then gradually increase to rated pressure.
3. LRH1 Controller Commissioning
Commission the LRH1 constant power controller ensuring the power setting matches the drive source (engine or electric motor) power output. The control start pressure setting range is 50 bar to 350 bar with a differential pressure Δp = 25 bar.During commissioning, first verify the control start pressure setting, then check the linearity of the power characteristic curve. The hydraulic stroke limiter enables continuous pump displacement limitation across the entire control range; ensure the limit value matches actual system requirements.
4. Fluid Cleanliness and Filtration
Fluid cleanliness of ISO 18/16/13 (NAS Class 8) or better is recommended. Use pressure line filters with a filtration ratio β10 ≥ 75 (per ISO 4572). Avoid suction filters, which increase suction resistance and cavitation risk; if essential, use with a vacuum switch monitor. Install a breather filter with filtration accuracy ≤10 μm on the reservoir and regularly check oil level and fluid condition.
5. Restart Procedure After Extended Shutdown
If the pump has been idle for more than 30 days, manually rotate the shaft several turns to verify free rotation before restarting. Check for abnormal leakage at the case drain port. After startup, operate at low pressure for 10–15 minutes until oil temperature reaches normal operating range before applying full load. When using fire-resistant fluids, shorten oil change intervals and increase fluid sampling frequency due to reduced lubricity.
