A7VO80EP/63R-NPB01 Rexroth Variable Piston Pump

Product Overview

The A7VO80EP/63R-NPB01 is a Bosch Rexroth A7VO Series 63 variable displacement axial piston pump with a bent-axis rotary group for open-circuit hydrostatic drives. Rexroth specifies the A7VO family for mobile and stationary applications, with continuous flow variation achieved by changing the bent-axis position. The Series 63 platform covers sizes 28 to 160 cm³/rev and is rated at 350 bar nominal pressure and 400 bar maximum pressure.

The supplied model codes are:

• A7VO80EP/63R-NPB01
• A7VO80LR/63L-NZB01

Both are 80 cm³/rev Series 63 A7VO pumps, but they use different control architectures, rotation directions and shaft configurations.

A7VO80EP/63R-NPB01 uses EP proportional electric control, clockwise rotation, an NBR sealing configuration, a DIN 6885 keyed shaft, ISO 3019-2 four-hole mounting and rear SAE work ports.

A7VO80LR/63L-NZB01 uses LR power control without power override, counterclockwise rotation, NBR sealing, a DIN 5480 splined shaft, ISO 3019-2 four-hole mounting and rear SAE work ports.

For aftermarket replacement, our engineering process verifies the complete configuration rather than relying on the A7VO80 family designation alone. Confirmed replacement units are supplied for in-place interchangeability and validated through 100% simulated working-condition testing.

Technical Specifications

A7VO80EP/63R-NPB01

• Brand: Bosch Rexroth
• Series: A7VO Series 63
• Product Type: Bent-Axis Variable Displacement Axial Piston Pump
• Circuit: Open Circuit
• Complete Model Code: A7VO80EP/63R-NPB01
• Nominal Displacement: 80 cm³/rev
• Displacement: approximately 4.88 in³/rev
• Nominal Pressure: 350 bar / 5,076 psi
• Maximum Pressure: 400 bar / 5,802 psi
• Maximum-Pressure Duty: up to 10 s for a single operating period, subject to the total operating-period limitation specified by Rexroth
• Rated Speed at Vgmax: 2,240 rpm
• Maximum Speed nmax1: 3,000 rpm at Vgmax under the specified conditions
• Maximum Speed nmax2: 3,350 rpm at lower displacement under the specified inlet conditions
• Theoretical Flow at Rated Speed and Vgmax: 179 L/min
• Theoretical Power at 350 bar and Vgmax: 105 kW
• Theoretical Torque at 350 bar and Vgmax: 446 N·m
• Case Volume: approximately 1.5 L
• Reference Weight: approximately 49 kg.
• Control: EP — Proportional Electric Control
• EP Function: continuous displacement control proportional to the electrical control current applied to the solenoid.
• Auxiliary Control Pressure: approximately 40 bar external control pressure may be required at port Y when operating pressure is below 40 bar.
• Rotation: R — clockwise, viewed on the drive shaft
• Seal Code: N — NBR sealing system
• Shaft: P — parallel keyed shaft according to DIN 6885
• Mounting Flange: B — ISO 3019-2, four-hole
• Work Ports: 01 — SAE flange ports A and S at the rear with metric fastening threads.

Electrical-control note

Rexroth’s Series 63 documentation describes the modern EP2 implementation with 24 V ±20%, 200 mA start-of-control, 600 mA end-of-control, 0.77 A current limit, 22.7 Ω nominal resistance and 100 Hz dither. Because the supplied legacy code is EP, not EP2, those EP2 electrical values should not be advertised as fixed specifications for this exact legacy model without verification from the nameplate or order confirmation.

A7VO80LR/63L-NZB01

• Brand: Bosch Rexroth
• Series: A7VO Series 63
• Product Type: Bent-Axis Variable Displacement Axial Piston Pump
• Circuit: Open Circuit
• Complete Model Code: A7VO80LR/63L-NZB01
• Nominal Displacement: 80 cm³/rev
• Displacement: approximately 4.88 in³/rev
• Nominal Pressure: 350 bar / 5,076 psi
• Maximum Pressure: 400 bar / 5,802 psi
• Rated Speed at Vgmax: 2,240 rpm
• Maximum Speed nmax1: 3,000 rpm
• Maximum Speed nmax2: 3,350 rpm under the specified lower-displacement/inlet conditions
• Theoretical Flow: 179 L/min at rated speed and Vgmax
• Theoretical Input Power: 105 kW at 350 bar and Vgmax
• Theoretical Torque: 446 N·m at 350 bar and Vgmax
• Case Volume: approximately 1.5 L
• Reference Weight: approximately 49 kg.
• Control: LR — Power Controller Without Power Override
• LR Control Range — Beginning of Control: 50–220 bar
• LR Function: displacement changes according to operating pressure so that the defined drive power is not exceeded at constant drive speed.
• Rotation: L — counterclockwise, viewed on the drive shaft
• Seal Code: N — NBR sealing system
• Shaft: Z — DIN 5480 splined shaft
• Mounting Flange: B — ISO 3019-2, four-hole
• Work Ports: 01 — SAE flange ports A and S at the rear with metric fastening threads.

Engineering Difference Between the Two Configurations

A7VO80EP/63R-NPB01

Key configuration:

EP Proportional Electric Control + Clockwise Rotation + DIN 6885 Keyed Shaft

The pump displacement is continuously controlled according to the electrical command signal applied to the proportional solenoid. This configuration is suitable where an electronic machine-control system needs direct variable pump-output management.

A7VO80LR/63L-NZB01

Key configuration:

LR Power Control Without Power Override + Counterclockwise Rotation + DIN 5480 Splined Shaft

The LR controller changes pump displacement in response to operating pressure so that the specified drive power is not exceeded. Rexroth specifies a 50–220 bar beginning-of-control adjustment range.

Although both pumps are 80 cm³/rev, they should therefore not be treated as automatically interchangeable.

Key Technical Advantages

1. Bent-Axis Axial Piston Architecture

The A7VO Series 63 uses an axial tapered-piston rotary group in a bent-axis design for open-circuit hydrostatic drives. Flow is proportional to displacement and drive speed, while displacement is continuously changed through bent-axis adjustment.

2. 350/400 bar Pressure Platform

Rexroth specifies 350 bar nominal pressure and 400 bar maximum pressure for the Series 63 platform. The pressure definition distinguishes continuous design pressure from the limited-duration maximum-pressure operating condition.

3. Electronic Proportional Displacement Control

The EP version allows continuous displacement control using an electrical proportional signal. Rexroth also documents BODAS controllers and amplifiers for controlling the proportional solenoids.

4. Power-Controlled Operation

The LR version is designed to prevent the defined drive power from being exceeded at constant shaft speed. Its control characteristic is approximately hyperbolic, allowing better utilization of available prime-mover power.

5. Compact Installation Architecture

Rexroth specifically identifies A7VO Series 63 sizes 55 and 80 as available with rear or optional side working ports, making them useful in applications with restricted installation space such as compact excavators and concrete mixers.

6. Mobile and Stationary Applications

The A7VO platform is documented for both mobile and stationary applications, covering multiple displacement sizes from 28 to 160 cm³/rev in Series 63.

7. Optimized Rotary Group

Bosch Rexroth’s product material states that the optimized rotary groups of the A7VO Series 63 can improve overall efficiency by approximately 3–5% compared with the common hydraulic pumps referenced in that material. This is a Series-level performance statement rather than a guaranteed improvement for every individual pump and operating condition.

8. Configuration-Level Replacement

For replacement applications, the important engineering checkpoints are:

• Complete model code
• Rotation
• Shaft standard
• Mounting flange
• Port arrangement
• Control architecture
• Control setting
• Machine operating pressure
• Prime-mover speed

This is more reliable than matching the A7VO80 displacement alone.

Application Areas

Bosch Rexroth documents A7VO Series 63 for mobile and stationary hydrostatic systems. Its product material specifically references:

• Compact excavators
• Concrete mixers
• Construction machinery
• Mobile working machines
• Stationary hydraulic systems.

A7VO80EP/63R-NPB01

Typical application logic includes:

• Mobile machines requiring electronic displacement control
• Electrically commanded hydraulic systems
• Variable-flow open-circuit systems
• Mobile equipment integrated with electronic machine-control platforms

A7VO80LR/63L-NZB01

Typical application logic includes:

• Power-limited mobile hydraulic systems
• Constant-speed prime mover driven machines
• Concrete mixers
• Construction equipment
• High-load open-circuit hydraulic systems

Final application approval should be based on the original hydraulic schematic, shaft interface, rotation, control requirements and operating conditions.

Expert Maintenance Tips

1. Do not treat 400 bar as the continuous working pressure.
Rexroth distinguishes 350 bar nominal pressure from 400 bar maximum pressure. Maximum-pressure operation is limited to the specified single and total operating periods.

2. Monitor inlet pressure together with speed and displacement.
The technical data specifies a minimum inlet pressure of 0.8 bar absolute and a maximum inlet pressure of 2 bar absolute, while the required minimum inlet pressure also depends on speed and displacement.

3. Do not treat 3,000/3,350 rpm as unrestricted speeds.
For size 80, Rexroth specifies 2,240 rpm as rated speed at Vgmax, with higher permissible speeds dependent on displacement and inlet conditions.

4. Verify the EP electrical control system before replacement.
Check solenoid voltage, connector, control current, amplifier/controller and command direction. Do not automatically transfer modern EP2 electrical parameters to a legacy EP-coded unit.

5. Reconfirm the LR power setting after replacement.
The LR controller begins controlling within a 50–220 bar range, and Rexroth requests drive power, drive speed and maximum flow information when defining the power-control characteristic.

6. Match the shaft exactly.
A7VO80EP/63R-NPB01 uses a DIN 6885 keyed shaft, while A7VO80LR/63L-NZB01 uses a DIN 5480 splined shaft. The two should not be treated as mechanically interchangeable without dimensional verification.

7. Verify rotation from the drive-shaft end.
R means clockwise and L means counterclockwise when viewed from the drive shaft.

8. Verify the rear SAE work-port arrangement.
Code 01 identifies the rear SAE A/S work-port arrangement with metric mounting threads. Check A, B, S and drain/control connections before installation.

9. Control oil cleanliness and viscosity.
Rexroth warns that operation outside the permissible limits can cause loss of function, reduced service life or destruction of the axial piston unit. Fluid viscosity, inlet conditions and cleanliness should therefore be controlled during commissioning and service.

10. Perform 100% simulated working-condition testing.
For a verified replacement unit, final testing should include:

• Low-speed startup
• Rated-speed verification
• Full-displacement flow
• Pressure build-up
• Pressure-hold verification
• EP current-to-displacement response for the EP configuration
• LR pressure-to-displacement/power response for the LR configuration
• Case leakage
• Temperature rise
• Rotation verification
• Sustained-load stability

For EP units, the critical validation is current → displacement → flow response. For LR units, it is pressure → displacement → input-power response.

Technical Verification Summary

The core series data is based on Bosch Rexroth RE 92202, A7VO Series 63, which defines the product as a variable axial piston pump with bent-axis rotary group for open-circuit hydrostatic drives, with 350 bar nominal pressure and 400 bar maximum pressure.

For A7VO80, the official technical-data table gives:

• 80 cm³/rev
• 2240 rpm nominal speed at Vgmax
• 3000 rpm nmax1
• 3350 rpm nmax2 under the specified lower-displacement/inlet conditions
• 179 L/min theoretical flow
• 105 kW theoretical power at 350 bar
• 446 N·m theoretical torque
• approximately 49 kg
• approximately 1.5 L case volume.

For the control configurations, Rexroth documents EP as proportional electric control and LR as power controller without power override; the exact shaft, seal, flange and rear-port semantics are defined by the Series 63 ordering structure.

One important publication rule for your website: do not merge A7VO80EP/63R-NPB01 and A7VO80LR/63L-NZB01 into one undifferentiated specification block. They share the 80 cm³/rev platform but differ materially in control method, rotation and shaft configuration.