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AZPT Gear Pump
AZPT Gear Pump
 

AZPT External Gear Pump Rexroth OEM Replacement

Pump Type External Gear Pump
Displacement Range Min 20cc/rev, Max 36cc/rev
Pressure Rating Rated Pressure 22Mpa, Max Pressure 25Mpa
Speed Range Min 500 RPM, Max 3000 RPM
Material Aluminum Alloy
Mounting Type Flang or through-bolting with spigot
Rotation Counter-clockwise or clockwise
Key Features High Performance
OEM Manufactured Compatibility Rexroth
MOQ 10 PCS
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Our AZPT external gear pump replacement are direct drop-in alternatives to original Rexroth units, engineered to deliver identical performance and reliability at a competitive cost.
Designed to efficiently convert mechanical energy (torque, speed) into hydraulic energy (flow, pressure), our pumps utilize pressure-dependent gap sealing and precision manufacturing to minimize heat loss and match OEM efficiency.
We offer full coverage of 4 frame sizes (B, F, N, G) and all performance versions (Standard, High Performance, SILENCE, SILENCE PLUS), with configurable flanges, ports, shafts, and multi-pump setups to ensure seamless compatibility.
Our SILENCE-replacement models leverage the dual-flank principle to reduce flow pulsation by up to 75%, matching the low-noise performance of the original. 12-tooth gears and pressure-adaptive sealing ensure optimal efficiency, while robust slide bearings provide reliable high-pressure and low-speed emergency operation—just like the OEM pump.
Nominal size     20 22 25 28 32 36
Series     2x
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 V=12mm2/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
V=25mm2/s at P2 nmin rpm 500 500 500 500 500 500
Maximum rotational speed at P2 nmax rpm 3000 3000 3000 2800 2800 2800

  Nominal Size（cm³/r） Material Part Number Maximum Pressure(bar) Maximum Speed(rpm)
Counter-clockwise Clockwise
AZPT-22-…CB20MB 20 0 517 625 309 0 517 625 308 280 3000
22 0 517 725 312 0 517 725 016 280 3000
25 0 517 725 313 0 517 725 017 280 3000
28 0 517 725 314 0 517 725 018 260 3000
32 0 517 725 315 0 517 725 019 240 2800
36 0 517 725 316 0 517 725 020 210 2600
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 AZPT external 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
Tang Drive
Splined Shaft
Parallel Keyed Shaft
Front Cover Rectangular Flange
2-bolt Flange
2-bolt Mounting
Port Connection SAE Flange Connection ACC. to ISO 6162-1 with Metric Thread
SAE Flange Connection ACC. to ISO 6162-1 with UNC Thread
Square Flange(German Version)
UN-thread Acc. to ISO 11926-1/ASME B 1.1,O-ring1)
Sealing Material NBR(Nitrile Rubber)
FKM(Fluoroelastomer)
NBR(Nitrile Rubber),Shaft Seal in FKM(Fluoroelastomer)
Rear Cover Axial Pressure and Suction Port
Standard(Cast Iron)
Our AZPT external gear pump replacement are precision-engineered to fully match OEM specifications, ensuring seamless drop-in compatibility and performance equivalent to the original equipment.
Every AZPT external gear pump undergoes rigorous dimensional calibration, pressure testing, and flow performance validation to guarantee reliable operation and long service life. Our products hold CE and RoHS certifications, meeting EU safety, health, and environmental protection standards, making them suitable for global industrial hydraulic applications.
We back our quality with a 12-month warranty covering manufacturing defects and performance deviations. Our dedicated after-sales team provides prompt technical support, troubleshooting, and replacement services throughout the warranty period, minimizing system downtime and protecting your operational productivity.

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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