A7FO80/63L-NZB01 Rexroth A7FO80 Fixed Bent-Axis Pump 80cc 350bar

Product Overview

The A7FO80/63L-NZB01 is a core model in Bosch Rexroth’s A7FO series of bent-axis fixed displacement axial piston pumps, belonging to the bent-axis axial tapered piston pump platform designed for open-circuit hydrostatic drives. With a displacement of 80 cm³/rev, continuous rated pressure of 350 bar, and peak pressure of 400 bar, this pump features high speed capability, compact construction, and no requirement for a case drain line.

The A7VO series (including A7VO28, A7VO55, A7VO80, A7VO107, and A7VO160) comprises bent-axis variable displacement piston pumps. Output flow is proportional to drive speed and displacement, with infinitely variable flow achieved by adjusting the bent axis, suitable for both mobile and stationary applications.

Manufactured to Bosch Rexroth original engineering specifications, this pump achieves 100% drop-in interchangeability — the mounting flange and shaft of the A7FO80/63L-NZB01 are fully interchangeable with the A2FO series 6 fixed pump, requiring no piping modifications or mounting alterations for direct replacement. Every unit undergoes 100% simulated load testing prior to shipment, including rated pressure loading, flow-pressure characteristic verification, and thermal rise testing.

Technical Specifications 

A7FO80/63L-NZB01 (Fixed Pump)

• Model: A7FO80/63L-NZB01

• Material Number: R902027371

• Series: A7FO Series, Series 6

• Pump Type: Bent-axis axial tapered piston fixed pump, open circuit

• Displacement: 80 cm³/rev

• Rated Pressure: 350 bar

• Peak Pressure: 400 bar

• Direction of Rotation: L (counter-clockwise, viewed from shaft end)

• Mounting Flange/Shaft: Fully interchangeable with A2FO Series 6 fixed pump

• Weight: Approx. 40.7 kg

• Features: No case drain line required; bearing flush port for high ambient temperature applications

• Series Displacement Range: 29 to 160 cm³/rev

A7VO Series (Variable Pump) — Key Model Specifications

A7VO28

• Displacement: 28.1 cm³/rev

• Rated Pressure: 350 bar

• Peak Pressure: 400 bar

• Max Speed: 3,150 rpm

• Max Flow: 89 L/min

• Max Power (Δp=350 bar): 52 kW

• Max Torque (Δp=350 bar): 156 Nm

• Weight: Approx. 17 kg

A7VO55

• Displacement: 54.8 cm³/rev

• Rated Pressure: 350 bar

• Peak Pressure: 400 bar

• Max Speed: 2,500 rpm

• Max Flow: 137 L/min

• Max Power (Δp=350 bar): 80 kW

• Max Torque (Δp=350 bar): 305 Nm

• Weight: Approx. 25 kg

A7VO80

• Displacement: 80 cm³/rev

• Rated Pressure: 350 bar

• Peak Pressure: 400 bar

• Max Speed: 2,240 rpm

• Max Flow: 179 L/min

• Max Power (Δp=350 bar): 105 kW

• Max Torque (Δp=350 bar): 446 Nm

• Weight: Approx. 40 kg

A7VO107

• Displacement: 107 cm³/rev

• Rated Pressure: 350 bar

• Peak Pressure: 400 bar

• Max Speed: 2,150 rpm

• Max Flow: 230 L/min

• Max Power (Δp=350 bar): 134 kW

• Max Torque (Δp=350 bar): 596 Nm

• Weight: Approx. 49 kg

A7VO160

• Displacement: 160 cm³/rev

• Rated Pressure: 350 bar

• Peak Pressure: 400 bar

• Max Speed: 1,900 rpm

• Max Flow: 304 L/min

• Max Power (Δp=350 bar): 177 kW

• Max Torque (Δp=350 bar): 891 Nm

• Weight: Approx. 71 kg

A7VO series specifications sourced from Bosch Rexroth official data sheet RE 92202.

A7VO Series Control Options

• LR: Power controller (constant horsepower control) with hyperbolic power characteristic

• DR: Pressure controller

• DRG: Pressure controller with remote regulation

• LRD: Power controller with integrated pressure control

• LRG: Power controller with remote regulation

• LRDH1: Power controller with hydraulic stroke limiter

• HD: Proportional control, hydraulic (dependent on pilot pressure)

• EP: Proportional control, electric (12V DC / 24V DC)

• DA: Hydraulic control, dependent on pilot pressure

Key Technical Advantages

1. 100% Drop-in Interchangeability

The mounting flange and shaft of the A7FO80/63L-NZB01 are fully interchangeable with the A2FO Series 6 fixed pump, meaning no piping modifications, coupling changes, or baseplate alterations are required when replacing a failed original unit, dramatically reducing downtime. The A7VO series also adheres to Rexroth standardized mounting interfaces, ensuring complete physical and hydraulic interchangeability with OEM equipment.

2. High Efficiency from Bent-Axis Design

The A7VO series utilizes a bent-axis axial tapered piston rotary group design. Optimized rotary groups improve overall efficiency by 3 to 5 percent compared to common hydraulic pumps. Higher efficiency means less flow is required to transmit the same power, reducing flow losses and energy dissipation in the hydraulic system. The series achieves best-in-class overall efficiency.

3. High Speed Capability & Compact Construction

The A7VO series offers high permissible speeds — up to 3,150 rpm for A7VO28, 2,500 rpm for A7VO55, and 2,240 rpm for A7VO80. High speed capability enables greater output flow from the same displacement, or allows selection of a smaller displacement pump for the same flow requirement, enabling compact system design. The robust, compact bearing system ensures long service life.

4. Wide Selection of Control Devices

The A7VO series offers a comprehensive range of variable control options including power control (LR), pressure control (DR), remote pressure control (DRG), electro-hydraulic proportional control (EP), and hydraulic proportional control (HD). Users can select the optimal control scheme based on specific host machine requirements. The power controller features a hyperbolic characteristic for precise power regulation and optimized prime mover utilization.

5. A7FO80 Fixed Pump Special Advantages

As a fixed displacement pump, the A7FO80/63L-NZB01 requires no case drain line, simplifying system piping layout. It is equipped with a bearing flush port for forced bearing cooling in high ambient temperature applications, extending bearing service life. The pump’s high speed capability and high pressure rating make it suitable for heavy-duty continuous operation.

Application Areas

• Construction Machinery: Excavators, wheel loaders, concrete mixers, compaction equipment hydraulic drive systems

• Mining & Metallurgical Equipment: Mining machinery, metallurgical rolling mills, heavy-duty planers hydraulic power sources

• Metal Forming & Stamping: Hydraulic presses, stamping equipment, metal forming machine tools main hydraulic pumps

• Machine Tools & Industrial Equipment: CNC machine tools, test benches, oilfield equipment hydraulic systems

• Marine & Offshore: Ship deck machinery, port crane hydraulic systems

• Agricultural & Forestry Machinery: Tractors, combine harvesters, forestry equipment hydraulic drive systems

The A7VO series is particularly suitable for construction machinery with very limited installation space (e.g., compact excavators, concrete mixers), with selected sizes additionally available with side ports for further space savings.

Expert Maintenance Tips

Pre-Installation Check: Before installation, the pump case must be filled with clean ISO VG46 anti-wear hydraulic oil through the drain port. Although the A7FO80/63L-NZB01 requires no case drain line, the internal bearings and high-speed sliding components still require adequate lubrication. Never dry-start the pump.

Coupling Alignment: The coaxiality deviation (TIR) between pump shaft and motor shaft must be controlled within 0.05 mm. Misalignment leads to premature bearing wear, shaft seal leakage, and abnormal noise. Flexible couplings must be used.

Fluid Cleanliness Management: System oil cleanliness must achieve NAS Class 9 or higher (ISO 4406 18/16/13). Contamination is the primary cause of premature piston pump failure. ISO VG46 hydraulic oil is recommended; viscosity selection should be based on actual operating temperature.

Bearing Flush Port Usage (A7FO80 Specific): In high ambient temperature applications, connect the bearing flush port. Use clean, cool flush oil through this port for forced bearing flushing at a recommended flow rate of 2 to 5 L/min with flush pressure not exceeding 5 bar.

First Start-up & Restart After Extended Shutdown: After initial installation or extended shutdown, perform a “low-speed no-load air purge” procedure — run at low speed for 3 to 5 minutes until air is fully expelled, then gradually apply load.

A7VO Variable Pump Control Setting Verification: For A7VO series pumps equipped with LR (power control), it is recommended to verify the power control setting using a power meter during initial commissioning to ensure it matches the prime mover’s power rating. Incorrect power settings may cause prime mover overload or insufficient pump output.