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AZPU Gear Pump
AZPU Gear Pump
 

Rexroth AZPU Hydraulic Gear Pump Replacement

Pump Type External Gear Pump
Displacement Range Min 22.5cc/rev, Max 63cc/rev
Pressure Rating Rated Pressure 17Mpa, Max Pressure 25Mpa
Speed Range Min 500 RPM, Max 3000 RPM
Material Aluminum Alloy
Mounting Type Flang or through-bolting with spigot
Rotation Clockwise, counter-clockwise
Key Features High Performance
OEM Manufactured Compatibility Rexroth
MOQ 10 PCS
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Rexroth AZPU hydraulic gear pump alternatives from our dedicated factory are high-performance, fixed-displacement solutions engineered for industrial and mobile applications. Covering a nominal displacement range of 22 to 63 cc/rev, this pump delivers stable flow and exceptional volumetric efficiency (≥95%). Designed for demanding conditions, it supports continuous pressures up to 250 bar and intermittent pressures up to 280 bar. As a direct manufacturer, we offer competitive pricing and comprehensive OEM customization—including tailored drive shafts, front cover dimensions, and port connections. Experience a seamless, durable, and highly reliable drop-in equivalent for your hydraulic systems.
Nominal size 22 25 28 32 36
Series 2x
Displacement geometric,per revolution Vg cm³ 22.5 25 28 32 36
Pressure at suction port S1)             absolute pe bar 0.7 … 3
Maximum continuous pressure p1 bar 250 250 250 250 250
Maximum intermittent pressure2) p2 bar 280 280 280 280 280
Maximum pressure peaks p3 bar 300 300 300 300 300
Minimum rotational speed V=12mm2/s P<100 bar nmin rpm 500 500 500 500 500
          P=100 … 180 bar nmin rpm 1200 1200 1000 1000 1000
          P=180 bar … P2 nmin rpm 1400 1400 1400 1400 1200
V=25mm2/s at P2 nmin rpm 600 600 500 500 500
Maximum rotational speed at P2 nmax rpm 3000 3000 3000 2800 2800
                 
Nominal size 40 45 50 56 63
Series 2x
Displacement geometric,per revolution Vg cm³ 40 45 50 56 63
Pressure at suction port S1)             absolute pe bar 0.7 … 3
Maximum continuous pressure p1 bar 250 250 220 195 170
Maximum intermittent pressure2) p2 bar 280 280 250 225 200
Maximum pressure peaks p3 bar 300 300 280 250 230
Minimum rotational speed V=12mm2/s P<100 bar nmin rpm 500 500 500 500 500
          P=100 … 180 bar nmin rpm 800 800 800 800 800
          P=180 bar … P2 nmin rpm 1200 1000 1000 1000 1000
V=25mm2/s at P2 nmin rpm 500 500 500 500 500
Maximum rotational speed at P2 nmax rpm 2800 2600 2600 2300 2300

  Nominal Size（cm³/r） Material Part Number Weight(kg)
Counter-clockwise Clockwise
AZPU-22-…CB20MB 22 0 517 725 322 0 517 725 026 10.3
25 0 517 725 323 0 517 725 027 10.4
28 0 517 725 324 0 517 725 028 10.5
32 0 517 725 325 0 517 725 029 10.7
36 0 517 725 326 0 517 725 030 10.9
40 0 517 725 327 0 517 725 031 11.0 
45 0 517 725 328 0 517 725 032 11.2
50 0 517 825 301 0 517 825 001 11.4
56 0 517 825 302 0 517 825 002 11.7
63 0 517 825 303 0 517 825 003 12.0 
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.

Our AZPU external hydraulic gear pump replacement 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 Shaft Tapered Keyed Shaft
Splined Shaft
Parallel Keyed Shaft
Front Cover Rectangular Flange
2-bolt Flange
Port Connection SAE Flange Connection acc. to ISO6162-1 with Metric Thread
SAE Flange Connection acc. to ISO6162-1 with UNC Thread
Square Flange(German Version)
Square Flange(Italian Version)
UN-thread According to ISO 11926-1/ASME B 1.1,O-ring
Sealing Material NBR(Nitrile Rubber)
FKM(Fluorocarbon Rubber)
NBR(Nitrile Rubber),Shaft Seal in FKM(Fluorocarbon Rubber)
Rear Cover Axial Pressure and Suction Port
Standard(Cast Iron)
As a trusted manufacturer, we ensure your OEM replacement for the AZPU External gear pump is built on a foundation of strict quality control. Our closed-loop process from raw material to final delivery guarantees absolute reliability:
  • Material Traceability: Strict qualification and inspection of all raw materials before production.
  • Certified Machining: ISO 9001-aligned manufacturing, verified by advanced CMM metrology.
  • 100% Unit Testing: Rigorous dynamic pressure and functional verification for every single pump before dispatch.
  • Guaranteed Delivery: Arrives ready for work, backed by up to a 12-month warranty and responsive technical support.

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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