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AZPS Gear Pump
AZPS Gear Pump
 

Rexroth AZPS External Gear Pump Replacement | Compatible & Cost-Effective

Pump Type External Gear Pump
Displacement Range Min 4cc/rev, Max 28cc/rev
Pressure Rating Rated Pressure 17Mpa, Max Pressure 25Mpa
Speed Range Min 500 RPM, Max 4000 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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This AZPS external gear pump is a premium replacement part, fully compatible with Bosch Rexroth original AZPS series. It features 1:1 matching mounting dimensions, ports, and performance specs, enabling direct drop-in replacement without machine modification, significantly reducing procurement and maintenance costs.
As an F-platform fixed-displacement precision hydraulic pump, it offers 4–28cm³/rev displacement, 250bar continuous pressure, 280bar intermittent peak pressure, and 700–4000rpm speed range. With ≥96% volumetric efficiency, flow ripple ≤±1%, and 3–5dB lower noise than standard pumps, it delivers stable, efficient performance. Built with 12-tooth involute gears + pressure-adaptive gap sealing, high-strength aluminum alloy body, and gray cast iron rear cover, it ensures durability across -20℃ to +100℃ and 10–1000mm²/s hydraulic fluid viscosity.
ISO/SAE-compliant drive shafts (keyed, splined, 1:5 taper) and square/rectangular flange ports support single or multi-pump combinations. Ideal for injection molding, die-casting, construction machinery, machine tools, and metallurgical equipment—the cost-effective alternative to original Rexroth AZPS pumps.
Nominal size 4 5 8 11 14 16 19 22 25 28
Series 1x 2x
Displacement geometric,per revolution Vg cm³ 4 5.5 8 11 14 16 19 22.5 25 28
Pressure at suction port S1)  absolute pe bar 0.7 … 3
Maximum continuous pressure p1 bar 250 250 250 250 250 250 250 220 195 170
Maximum intermittent pressure2) p2 bar 280 280 280 280 280 280 280 250 225 200
Maximum pressure peaks p3 bar 300 300 300 300 300 300 300 290 265 240
Minimum rotational speed V=12mm2/s P<100 bar nmin rpm 600 500 500 500 500 500 500 500 500 500
          P=100 … 180 bar nmin rpm 1200 1200 1000 1000 800 800 800 800 800 800
          P=180 bar … P2 nmin rpm 1400 1400 1400 1200 1000 1000 1000 1000 1000 1000
V=25mm2/s at P2 nmin rpm 700 700 700 600 500 500 500 500 500 500
Maximum rotational speed at P2 nmax rpm 4000 4000 4000 3500 3000 3000 3500 3500 3000 3000

  Nominal Size（cm³/r） Material Part Number Weight(kg)
Counter-clockwise Clockwise
AZPS-XX-…NM20MB 4 0 517 215 301 0 517 215 001 2.15
5 0 517 315 301 0 517 315 001 2.2
8 0 517 415 301 0 517 415 001 2.3
0 517 415 003 2.3
11 0 517 515 302 0 517 515 001 2.4
0 517 515 312 R 919 010 182 2.4
14 0 517 515 303 0 517 515 002 2.55
16 0 517 615 301 0 517 615 001 2.6
19 0 517 615 302 0 517 615 002 3
22.5 0 517 715 301 0 517 715 001 3.2
0 517 715 005 3.2
25 0 517 715 302 0 517 715 002 3.3
28 0 517 715 303 0 517 715 003 3.4
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 AZPS series 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 Shaft Tapered Keyed Shaft
Tang Drive
Splined Shaft
Parallel Keyed Shaft
Front Cover Rectangular Flange
2-bolt Flange
2-bolt Mounting
4-bolt Mounting
Outrigger Bearing
Port Connection Pipe Thread According to ISO 228-1
UN-thread According to ISO 11926-1/ASME B 1.1,O-ring
Square Flange(German Version)
Square Flange(Italian Version)
Metric Thread According to ISO 6149,O-ring
Sealing Material NBR(Nitrile Rubber)
FKM(Fluorocarbon Rubber)
NBR(Nitrile Rubber),Shaft Seal in FKM(Fluorocarbon Rubber)
Rear Cover Standard(Cast Iron)
Pressure Relief Valve(with Internal/External Residual Flow)
Flow Control Valve(with Internal/External Residual Flow)
Flow Control Valve and Pressure Relief Valve(with Internal Residual Flow)
Our replacement AZPS series gear pumps are produced under strict ISO 9001 quality management systems. Each pump is 100% tested for pressure, flow, noise, sealing and durability to ensure stable performance and full interchangeability with original Rexroth AZPS units.
 
We use high-strength materials and precision machining to ensure long service life, low noise and reliable operation under continuous working conditions. All dimensions and hydraulic specifications are strictly matched for direct drop-in replacement.
 
All our AZPS gear pumps come with a 12-month warranty against defects in material and workmanship. We provide professional after-sales support to ensure your operation runs smoothly and efficiently.

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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