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AZPN Gear Pump
AZPN Gear Pump
 

Rexroth AZPN External Gear Pump OEM Replacement

Pump Type External Gear Pump
Displacement Range Min 20 cc/rev, Max 36 cc/rev
Pressure Rating Rated Pressure 23 Mpa,Max Pressure 28 Mpa
Speed Range Min 500 RPM, Max 3000 RPM
Material Aluminum Alloy
Mounting Type Flange or through-bolting with spigot
Rotation Counter-clockwise,clockwise
Key Features High Performance
OEM Manufactured Compatibility Rexroth
MOQ 10 PCS
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Rexroth AZPN external gear pump alternatives from our dedicated factory are heavy-duty hydraulic solutions built with robust cast iron and high‑strength alloy components. Covering a displacement range from 20 to 36 cc/rev, they deliver consistent high‑volume flow at operating speeds between 600 and 3,000 RPM. Engineered for heavy‑load applications, these pumps support a rated pressure of 25 MPa and a maximum intermittent pressure of 28 MPa. Featuring ISO/SAE‑compliant drive shafts and flange‑type port connections, they are available in clockwise and counter‑clockwise rotations for seamless system integration. As a direct manufacturer, we offer full OEM customization—including multi‑pump combinations, custom shaft profiles, and front cover configurations—to match your exact hydraulic requirements. Benefit from a reliable, cost‑effective drop‑in replacement for your industrial hydraulic systems.

Operating Conditions AZPN Series 1x
Nominal size 20  22  25  28  32  36 
Displacement geometric,per revolution Vg cm³ 20  22.5  25  28  32  36 
Pressure at suction port S1)   absolute pe bar 0.7 …3
Maximum continuous pressure p1 bar 230  230  230  210  180  160 
Maximum  intermittent pressure2) p2 bar 250  250  250  230  200  180 
Maximum pressure peaks p3 bar 270  270  270  250  220  200 
Minimum rotational speed at V=12  mm²/s p≤100 bar nmin rpm 500  500  500  500  500  500 
p=100…180 bar nmin rpm 600  600  600  600  600  600 
p=180 bar.….p₂ nmin rpm 800  800  800  800  800  800 
Maximum rotational speed V=25mm²/s at  p₂ nmin rpm 500  500  500  500  500  500 
at  p₂ nmax rpm 3000  3000  3000  2800  2800  2800 
Operating Conditions AZPN Series 2x
Nominal size 20  22  25  28  32  36 
Displacement geometric,per revolution Vg cm³ 20  22.5  25  28  32  36 
Pressure at suction port S1)   absolute pe bar 0.7 …3
Maximum continuous pressure p1 bar 250  250  250  230  210  180 
Maximum  intermittent pressure2) p2 bar 280  280  280  260  240  210 
Maximum pressure peaks p3 bar 300  300  300  280  260  230 
Minimum rotational speed at V=12  mm²/s p≤100 bar nmin rpm 500  500  500  500  500  500 
p=100…180 bar nmin rpm 600  600  600  600  600  600 
p=180 bar.….p₂ nmin rpm 800  800  800  800  800  800 
Maximum rotational speed V=25mm²/s at  p₂ nmin rpm 500  500  500  500  500  500 
at  p₂ nmax rpm 3000  3000  3000  2800  2800  2800 

  Nominal Size(cm³/r) Material part number Weight
  (kg)
counter-clockwise clockwise
AZPN-11-… CB20MB 20  0 510 625 335 0 510 625 035   5.4 
25  0 510 725 352 0 510 725 047   5.6 
28  0 510 725 364 0 510 725 055   5.7 
32  0 510 725 353 0 510 725 048   5.9 
Operating Characteristics & Calculation Reference
Determining Operating Characteristics
The following formulas help estimate flow, torque, and power based on operating conditions. Values are for reference during system design and pump selection.
Formulas shown are commonly used for hydraulic gear pump performance estimation.
Symbol Description
Vg Displacement per revolution [cm³]
Δp Differential  pressure  [bar](Δp = p – pe)
n Rotational speed [rpm]
ηv Volumetric efficiency
ηhm Hydraulic-mechanical efficiency
ηt Total efficiency(ηt = ηv × ηhm)
Calculated values may vary depending on operating conditions, oil viscosity, and system configuration.
 
Suggested Applications
In addition to standard industrial and mobile hydraulic systems, our hydraulic gear pump solutions are also widely used in:
•Construction Machinery

Komatsu Excavator

•Agricultural Machinery 

New Holland Windrowers

•Material Handling Equipment

Forklift

•Industrial Hydraulic Systems

Rubber Vulcanizing Machine

•Mobile Hydraulic Systems

Street Sweeper

These application-oriented solutions support custom configurations to meet different system pressures, flow requirements, and installation conditions.

The AZPN external gear pump supports extensive customization options, including drive shafts, front covers, port connections, sealing materials, and direction of rotation to meet diverse hydraulic system requirements.

Customization Item Available Options
Drive Shafts Tapered keyed shaft
Tang drive
Splined shaft
Parallel keyed shaft (SAE)
Parallel keyed shaft (ISO)
Front Covers Rectangular flange spigot
2-bolt flange spigot
2-bolt mounting spigot
4-bolt mounting spigot
Outrigger bearing spigot
Port Connections Pipe thread according to ISO 228-1
UN thread according to ISO 11926-1 / ASME B1.1 O-ring port
Square flange (German version)
Square flange (Italian version)
Metric thread according to ISO 6149 with O-ring
Sealing Materials NBR (nitrile rubber)
FKM (fluoroelastomer)
NBR (nitrile rubber)
Direction of Rotation Clockwise
Counter-clockwise
We ensure the exact performance of every OEM replacement for the Rexroth AZPN series external hydraulic gear pump through strict, end-to-end manufacturing controls:
  • Material Verification: We cast our own housings and physically cut samples to guarantee zero internal porosity. In-house gear production ensures absolute control over material strength.
  • Automated Precision: CNC machining centers integrated with robotic arms eliminate human error, maintaining exact dimensional consistency for every component.
  • Contamination Control: To ensure internal cleanliness, all pumps are assembled in a strict temperature-controlled, dust-free cleanroom.
  • 100% Performance Tested: Every finished unit undergoes strict air-tightness verification and dynamic bench testing, guaranteeing a volumetric efficiency of ≥95%.
  • Quality Guarantee: We stand behind our manufacturing standards, backing our pumps with up to a 12-month warranty under normal operating conditions.

Hydraulic Gear Pump – FAQ

What is an external gear pump?

An external gear pump is a positive-displacement hydraulic pump that uses two externally meshing gears to deliver stable hydraulic flow.

What applications are external gear pumps commonly used for?

External gear pumps are widely used in construction machinery, agricultural equipment, industrial hydraulic systems, material handling, and mobile hydraulics.

What pressure range can an external gear pump handle?

Most external gear pumps operate at rated pressures up to 200–250 bar, with higher peak pressure depending on design and materials.

What displacement ranges are available?

External gear pumps are available in a wide range of displacements, typically from 1 cc/rev to over 100 cc/rev, depending on series and configuration.

What speed range is suitable for external gear pumps?

Typical operating speed ranges from 500 to 3000 RPM, depending on load conditions, oil viscosity, and pump design.

Can external gear pumps be customized?

Yes. External gear pumps can be customized in terms of displacement, pressure rating, shaft type, mounting flange, port size, and rotation direction.

Are external gear pumps interchangeable with OEM brands like Rexroth?

Many external gear pumps are designed to be dimensionally interchangeable with major OEM brands such as Rexroth, Danfoss, Eaton, and Parker.

What materials are used for external gear pumps?

Common materials include aluminum alloy housings for lightweight applications and cast iron housings for higher pressure and heavy-duty use.

What hydraulic fluids can be used?

External gear pumps are compatible with mineral hydraulic oils, HLP/HV oils, and other standard industrial hydraulic fluids.

How do I select the right external gear pump?

Selection depends on pressure rating, displacement, speed range, application requirements, and installation dimensions. Contact our engineers for technical support.

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