A2F80R6.1P5 Rexroth A2F Fixed Displacement Pump

Product Overview

The A2F Series Fixed Displacement Axial Piston Pump / Motor is a classic bent-axis hydraulic unit designed for hydrostatic power transmission. Historical A2F documentation describes the unit as a fixed-displacement bent-axis axial piston design that can be configured for pump or motor operation depending on the ordering code and hydraulic circuit.

The requested product range includes:

• A2F80R6.1P5
• A2F55R2Z3
• A2F55LEX3
• A2F23R4P4
• A2F55R2Z1
• A2F55L2Z1

For A2F80R6.1P5, the historical series-6.1 coding indicates:

• Size 80
• Clockwise rotation
• Series 6.1
• Keyed shaft
• Open-circuit pump end-plate configuration

Historical A2F/6.1 documentation identifies end plates 5 and 6 for open-circuit pump applications.

For replacement applications, our engineering approach focuses on in-place interchangeability, including displacement, rotation direction, shaft configuration, mounting interface and hydraulic connections, followed by 100% simulated working-condition testing.

Technical Specifications — Bulleted List

A2F80R6.1P5

• Model: A2F80R6.1P5
• Type: Fixed displacement axial piston pump
• Design: Bent-axis configuration
• Displacement: 80.4 cm³/rev
• Rotation: R — clockwise
• Series: 6.1
• Shaft: P — keyed shaft, GB1096-79
• End plate: 5 — open-circuit pump
• Nominal pressure: 350 bar
• Peak pressure: 400 bar
• Open-circuit speed at 0.09 MPa absolute inlet pressure: approximately 1,705 rpm
• Open-circuit speed at 0.10 MPa absolute inlet pressure: approximately 1,800 rpm
• Open-circuit speed at 0.15 MPa absolute inlet pressure: approximately 2,150 rpm
• Approximate weight: 23 kg for the 6.1 size-80 reference
• Actual permissible speed must be selected according to inlet conditions, operating pressure, viscosity and system configuration.

A2F55R2Z3

• Model: A2F55R2Z3
• Displacement: 54.8 cm³/rev
• Rotation: R — clockwise
• Series: 2
• Shaft: Z — DIN 5480 splined shaft
• Port plate: 3
• Type: Fixed displacement pump/motor configuration

A2F55R2Z1

• Model: A2F55R2Z1
• Displacement: 54.8 cm³/rev
• Rotation: R — clockwise
• Series: 2
• Shaft: Z — DIN 5480 splined shaft
• Port plate: 1

A2F55L2Z1

• Model: A2F55L2Z1
• Displacement: 54.8 cm³/rev
• Rotation: L — counter-clockwise
• Series: 2
• Shaft: Z — DIN 5480 splined shaft
• Port plate: 1

A2F23R4P4

• Model: A2F23R4P4
• Displacement: 22.7 cm³/rev
• Rotation: R — clockwise
• Series: 4
• Shaft: P — keyed shaft
• Port plate: 4
• Type: Fixed displacement A2F unit

A2F55LEX3

• Model supplied: A2F55LEX3
• Nominal family: A2F55
• Historical A2F55 displacement: approximately 54.8 cm³/rev
• Exact E/X3 suffix interpretation: not sufficiently verified
• Pressure, speed, shaft and port configuration: should not be published as confirmed specifications until the original nameplate or source drawing is checked.

This model string appears in current aftermarket listings, but listing presence alone is not sufficient evidence for decoding the original Rexroth ordering code.

Key Technical Advantages

1. Bent-Axis Fixed Displacement Architecture

The A2F design uses a bent-axis axial piston arrangement in which fixed displacement is generated directly by the rotary geometry. This provides a mechanically straightforward architecture for hydrostatic transmission systems.

2. High Power Density

The compact bent-axis layout provides a favorable power-to-size relationship, making the A2F architecture suitable for mobile and industrial hydraulic drives where installation space and power density are important.

3. Robust Rotary Group

Historical A2F documentation describes a high-performance rotary group with a spherical control area, self-centering characteristics and robust rolling bearings. These features are intended to support stable operation under demanding hydraulic loads.

4. One-Piece Tapered Pistons

Historical Rexroth documentation describes one-piece tapered pistons with piston rings, a design approach associated with efficient piston guidance and sealing within the bent-axis rotary group.

5. Multiple Shaft and Rotation Configurations

The A2F family supports multiple configuration combinations, including clockwise and counter-clockwise rotation as well as keyed and splined shaft designs. This is particularly important when developing replacement units for legacy machinery.

6. Replacement Engineering and 100% Testing

Our replacement program is focused on:

• In-place interchangeability
• Exact model-code matching
• Shaft and mounting-interface verification
• Rotation-direction verification
• Hydraulic port matching
• 100% simulated working-condition testing

The objective is to deliver a replacement unit that is engineered around the original installation conditions rather than relying on displacement alone.

Application Areas

Typical application areas include:

• Construction machinery
• Excavators
• Road construction machinery
• Hydraulic drive systems
• Winches and hoisting machinery
• Rotary drives
• Mobile hydraulic equipment
• Industrial hydraulic power systems
• Open-circuit hydraulic pump systems
• Legacy Rexroth / Hydromatik / Uchida replacement applications

The A2F architecture is associated with hydrostatic drive applications and may function as a pump or motor depending on its configuration.

Expert Maintenance Tips

Verify rotation direction before commissioning

For historical A2F ordering codes:

• R = clockwise
• L = counter-clockwise
• W = alternating direction

Incorrect rotation can result in incorrect hydraulic flow direction and improper drive operation.

Do not mix specifications between A2F generations

A current A2FM datasheet should not automatically be used as the specification sheet for a legacy A2F pump. For example, the A2F/6.1 keyed-shaft size-80 configuration has a specific 350/400 bar pressure rating and inlet-dependent open-circuit speed limits.

Control inlet pressure on open-circuit versions

For A2F/6.1 open-circuit pumps, permissible speed changes with absolute inlet pressure. Therefore, speed selection must account for suction conditions rather than using the closed-circuit speed value directly.

Maintain hydraulic cleanliness

High-pressure axial piston units require clean hydraulic fluid and properly controlled contamination levels. Filter condition, flushing quality, hose cleanliness and tank cleanliness should be checked before commissioning a replacement unit.

Confirm the complete ordering code

For legacy A2F replacement projects, always compare:

full model code + rotation + shaft + port plate + mounting interface + hydraulic connections.

Matching only A2F55 or A2F80 is not sufficient to guarantee dimensional and functional interchangeability.