AZPNF-11-028/016RDC0720KB-S0023 Rexroth Hydraulic Gear Pump 28/16cc 250bar

Product Overview

The AZPNF Series is a tandem pump configuration within the Bosch Rexroth AZP platform of external gear pumps, belonging to the high-performance Platform N product line. The two featured models—AZPNF-11-028/016RDC0720KB-S0023 (Material No. 0510765063) and AZPNF-11-028/019LDC2020KB-S0052 (Material No. 0510767315) —are tandem gear pumps that deliver two independent oil sources driven by a single shaft.

The AZPNF Series features Platform N frame size with displacements ranging from 20–36 cm³/rev, continuous operating pressures up to 250 bar, and intermittent pressures up to 280 bar. The pump‘s core construction comprises a pair of gear wheels supported by slide bearings, along with a housing featuring front and rear covers. The slide bearings are specifically engineered for high-pressure applications and exhibit excellent dry-running characteristics, particularly at low rotational speeds.

As original specification models within the Bosch Rexroth AZPNF line, these products enable direct form-fit-function interchangeability with original Rexroth units—no modifications to piping or mounting interfaces required. Our replacement solutions strictly adhere to Rexroth technical standards and undergo 100% simulated in-service testing to ensure performance, reliability, and service life identical to OEM products. They are the ideal choice for hydraulic system maintenance and upgrades in construction machinery, agricultural equipment, and industrial applications.

Technical Specifications 

Model 1: AZPNF-11-028/016RDC0720KB-S0023 (Material No. 0510765063)

Applicable Model:

• AZPNF-11-028/016RDC0720KB-S0023

• Material Number: 0510765063

Model Code Breakdown (per Bosch Rexroth naming convention):

• Product Series: AZPNF — Rexroth AZP Platform N External Gear Pump, Tandem Configuration

• Series Code: 11 — Series designation

• First Section Displacement: 028 — 28 cm³/rev

• Second Section Displacement: 016 — 16 cm³/rev

• Rotation: RDC — Right-hand (clockwise) configuration

• Port/Flange Configuration: 0720KB — Specific interface configuration code

• Custom Code: S0023 — Customer-specific configuration

Series Technical Specifications (per Bosch Rexroth official documentation):

• Product Platform: Platform N

• Pump Type: Fixed Displacement External Gear Pump

• Body Material: High-Strength Cast Iron

• Bearing Type: Slide Bearings

• Gear Teeth: 12-tooth design for reduced flow pulsation and noise

• Sealing: Pressure-dependent gap sealing

• Frame Size: 20 … 36

This Model Detailed Specifications:

• First Section Displacement: 28 cm³/rev

• Second Section Displacement: 16 cm³/rev

• Total Displacement: 44 cm³/rev

• Continuous Operating Pressure: 25 MPa (250 bar / 3,625 psi)

• Intermittent Operating Pressure: 28 MPa (280 bar / 4,060 psi)

• Rotation Direction: Right-hand (clockwise, viewed from shaft end)

• Operating Temperature Range: -20°C to +80°C (standard seals)

• Fluid Compatibility: Mineral hydraulic oil (HLP, HLVP)

• Filtration Requirement: ISO 4406 19/17/13 or higher

Model 2: AZPNF-11-028/019LDC2020KB-S0052 (Material No. 0510767315)

Applicable Model:

• AZPNF-11-028/019LDC2020KB-S0052

• Material Number: 0510767315

Model Code Breakdown (per Bosch Rexroth naming convention):

• Product Series: AZPNF — Rexroth AZP Platform N External Gear Pump, Tandem Configuration

• Series Code: 11 — Series designation

• First Section Displacement: 028 — 28 cm³/rev

• Second Section Displacement: 019 — 19 cm³/rev

• Rotation: LDC — Left-hand (counterclockwise) configuration

• Port/Flange Configuration: 2020KB — Specific interface configuration code

• Custom Code: S0052 — Customer-specific configuration

Series Technical Specifications (per Bosch Rexroth official documentation):

• Product Platform: Platform N

• Pump Type: Fixed Displacement External Gear Pump

• Body Material: High-Strength Cast Iron

• Bearing Type: Slide Bearings

• Gear Teeth: 12-tooth design for reduced flow pulsation and noise

• Sealing: Pressure-dependent gap sealing

• Frame Size: 20 … 36

This Model Detailed Specifications:

• First Section Displacement: 28 cm³/rev

• Second Section Displacement: 19 cm³/rev

• Total Displacement: 47 cm³/rev

• Continuous Operating Pressure: 25 MPa (250 bar / 3,625 psi)

• Intermittent Operating Pressure: 28 MPa (280 bar / 4,060 psi)

• Rotation Direction: Left-hand (counterclockwise, viewed from shaft end)

• Operating Temperature Range: -20°C to +80°C (standard seals)

• Fluid Compatibility: Mineral hydraulic oil (HLP, HLVP)

• Filtration Requirement: ISO 4406 19/17/13 or higher

Key Technical Advantages

1. Tandem Pump Modular Design — One Shaft, Two Circuits, Simplified System Layout
The AZPNF Series tandem pumps deliver two independent oil sources driven by a single shaft. This design significantly reduces the number of drive interfaces required, simplifies hydraulic piping layout, reduces installation space requirements, and minimizes system complexity.

2. Pressure-Dependent Gap Sealing for High Volumetric Efficiency
Rexroth AZP Series employs pressure-dependent gap sealing technology, where operating pressure forces movable slide bearings against the gear end faces to create dynamic seals. This design ensures optimal internal sealing at all operating pressures, significantly improving volumetric efficiency and minimizing heat losses.

3. Slide Bearings with 12-Tooth Gear Design — Low Noise, Long Service Life
Slide bearings are specifically engineered for high-pressure applications with excellent dry-running characteristics at low speeds. The 12-tooth gear design effectively reduces flow pulsation and noise emissions. The optimized bearing and gear combination ensures long-term reliable operation under high-pressure, high-speed conditions.

4. Flexible Multi-Pump Combinations and Configuration Options
The AZPNF Series supports multiple flange options, shaft types, valve arrangements, and multi-pump combinations. Optional integrated flow control or pressure-relief valves reduce piping complexity. The pumps are available in Standard, High-Performance, SILENCE, and SILENCE PLUS variants, flexibly adapting to diverse application requirements.

5. Wide Displacement Range with High Pressure Capacity
Platform N frame size covers 20–36 cm³/rev displacement range with continuous operating pressures up to 250 bar and intermittent pressures up to 280 bar. The combination of wide displacement range and high pressure capability makes it adaptable to diverse hydraulic system requirements—from agricultural machinery to construction equipment.

Application Areas

• Excavators: Hydraulic working systems for small to medium excavators (multi-circuit supply for boom, arm, bucket)

• Wheel Loaders: Hydraulic working systems and steering systems

• Agricultural Machinery: Tractor hydraulic systems, combine harvesters, sprayers

• Material Handling Equipment: Forklift hydraulic systems, aerial work platforms

• Construction Equipment: Road rollers, motor graders, and other heavy equipment hydraulic systems

• Industrial Hydraulic Systems: Industrial hydraulic power units and machine tool hydraulic systems

Expert Maintenance Tips

1. Installation Precautions

• The AZPNF Series is a uni-directional rotation pump—verify that the system‘s required rotation direction matches the pump’s identification marking before installation. Model 1 features right-hand (clockwise) rotation; Model 2 features left-hand (counterclockwise) rotation.

• Ensure coaxial alignment between the pump and drive shaft; flexible couplings are recommended to avoid radial loads on the pump shaft.

• For tandem pump installation, pay special attention to the port connection orientation and piping layout for both pump sections.

2. Fluid Management

• Use mineral hydraulic oils conforming to DIN 51524 standards (HLP, HLVP).

• System fluid cleanliness must meet ISO 4406 19/17/13 or higher.

• Prime the pump by filling the housing with hydraulic fluid through the suction port before initial start-up. Never run the pump dry.

3. Start-Up & Commissioning

• Use jog start method for initial start-up; verify correct rotation direction before continuous operation.

• Allow the pump to run under no-load (low pressure) conditions for 2-3 minutes to purge air and ensure proper lubrication.

• Gradually increase to operating pressure while monitoring noise, temperature, and system pressure for normal operation.

4. Routine Maintenance

• The AZPNF gear pump itself is maintenance-free; however, regular maintenance of the entire hydraulic system is essential for trouble-free pump operation.

• Inspect system fluid cleanliness and condition every 1,000-2,000 operating hours.

• Regularly replace return line filters and suction strainers to prevent contaminant ingress into the pump body.