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AZMF GEAR MOTOR 2
AZMF GEAR MOTOR 2
 

AZMF Hydraulic Gear Motor OEM Rexroth Replacement

Pump Type External Gear Motor
Displacement Range Min 8cc/rev, Max 28cc/rev
Pressure Rating Rated Pressure 25Mpa, Max Pressure 28Mpa
Speed Range Min 500 RPM, Max 4000 RPM
Material Aluminum Alloy
Mounting Type See offer drawing
Rotation Counter-clockwise or clockwise
Key Features High Performance
OEM Manufactured Compatibility Rexroth
MOQ 10 PCS
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The AZMF Hydraulic Gear Motor is a high-performance Rexroth OEM replacement designed for high-pressure reliability. Built from durable aluminum alloy, it offers a displacement range of 8cc/rev to 28cc/rev and handles speeds from 500 to 4000 RPM.
With a rated pressure of 25MPa (max 28MPa), this motor ensures stable torque and efficiency for demanding systems. Supporting both clockwise and counter-clockwise rotation, the AZMF provides maximum flexibility and precision, making it the ideal cost-effective alternative for industrial and mobile hydraulic applications.
Operating conditions  
Size   8  11  14  16 
Series Series 1x
Displacement geometric,per revolution   Vg cm³ 8  11  14  16 
Motor inlet pressure start up pressure Paartup bar 80  60  50  50 
maximum continuous pressure pi bar 250  250  250  250 
maximum intermittent pressure?) p₂ bar 280  280  280  280 
maximum pressure peak ps bar 300  300  300  300 
minimum inlet pressure absolute³ pmin bar 0.7  0.7  0.7  0.7 
Motor output
pressure for		 bi-directional motors PA bar ≤ continuous pressure
non-bi-directional motors absolute PA bar 3  3  3  3 
upon start-up PA bar 10  10  10  10 
Motors with proportional
pressure relief valve		 max. PA bar 40  40  40  40 
Pressure in the drain port  maximum¹ absolute pL bar 3  3  3  3 
upon start-up pL bar 10  10  10  10 
Minimum rotational
speed at		 v=12mm²/s p<100 bar Nmin rpm 500  500  500  500 
p=100…180 bar min rpm 1000  1000  800  800 
p=180  bar…p₂ nmin rpm 1400  1200  1000  1000 
v=25  mm²/s at  p₂ nmin rpm 700  600  500  500 
Maximum rotational speed at  p₂ nmax rpm 4000  3500  3000  3000 
Maximum rotational speed at p₂and 50%duty cycle nmax rpm 4500  4000  3500  3500 

 

Size 19  22  25  28 
Series Series 2x
Displacement geometric,per revolution   Vg cm³ 19  22.5  25  28 
Motor inlet pressure start up pressure Pstatup bar 50  50  50  50 
maximum continuous pressure P1 bar 250  220  195  170 
maximum  intermittent pressure²) p2 bar 280  250  225  200 
maximum pressure peak p3 bar 300  280  255  230 
minimum inlet pressure absolute³ )pmin bar 0.7  0.7  0.7  0.7 
Motor output
pressure for		 bi-directional motors   PA bar ≤ continuous pressure
non-bi-directional motors absolute PA bar 3  3  3  3 
upon start-up PA bar 10  10  10  10 
Motors with proportional
pressure relief valve		 max. PA bar 40  40  40  40 
Pressure in the drain port  maximum¹ absolute pL bar 3  3  3  3 
upon start-up pL bar 10  10  10  10 
Minimum rotation-
al speed at		 v  12 mm²/s p<100 bar nmin rpm 500  500  500  500 
p=100…180 bar nmin rpm 800  800  800  800 
p=180 bar.….p2 nmin rpm 1000  1000  1000  1000 
v=25  mm²/s at  p₂ nmin rpm 800  800  500  500 
Maximum rotational speed at  p₂ nmax rpm 3500  3500  3000  3000 
Maximum rotational speed at pz and 50%duty cycle nmax rpm 4000  4000  3500  3500 

 

Rexroth AZMF part number table
NG Order number Direction
of rotation		 Maximum intermittent
pressure   p₂ [bar]		 Maximum
rotational speed
[rpm]		 Dimensions    C
Counter-clockwise Clockwise A B
8  0511425300 0511425001 210  4000  43.2  90.7     M6;min.13 deep
11  0511525300 0511525001 210  3500  47.0  95.9   
0511525311   210  3500  47.0  94.1   
14  0511525304   210  3000  47.5  100.9   
16    0511625005 210  3000  47.5  104.4   
19  0511625308 0511625009 180  3000  47.5  109.4   
  0511625003 180  3000  47.5  109.4   
22  (0511725304 0511725005 210  3000  61.1  125.0   

 

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]
△p Differential   pressure   [bar](△p=p₁-PA)
n Rotational speed [rpm]
qv Inlet flow [L/min]
M Torque [Nm]
P Power [kW]
ηv Volumetric efficiency1)
ηhm Hydraulic-mechanical efficiency²)
ηt Total   efficiency(ηt=ηv×ηhm)²)
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 
•Agricultural Machinery
•Material Handling Equipment
•Industrial Hydraulic Systems
•Mobile Hydraulic Systems
These application-oriented solutions support custom configurations to meet different system pressures, flow requirements, and installation conditions.
The AZMF 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 Shafts Tapered keyed shaft
Tang drive
Parallel keyed shaft (SAE)
Splined shaft
Splined shaft (SAE)
Front Covers Outrigger bearing spigot
Rectangular flange spigot
2-bolt mounting spigot
4-bolt mounting spigot
2-bolt flange SAE
Port Connections Pipe thread according to ISO 228-1
Metric thread according to IS0 9974-1¹)
UN-thread according to ISO 11926-1/ ASME B 1.1, O-ring¹)
Square flange (German version)
quare flange
Sealing Materials NBR (nitrile rubber)
FKM (fluoroelastomer)
NBR (nitrile rubber)
Direction of Rotation Clockwise
Counter-clockwise
AZMF Hydraulic Gear Motor (Rexroth Replacement) is engineered by our ISO 9001-certified facility to deliver precise 1:1 compatibility and OEM-level performance. Utilizing high-strength extruded aluminum and case-hardened steel gears, we ensure maximum durability under high-speed and high-pressure conditions. Unlike standard batch sampling, every motor undergoes 100% individual performance testing, including volumetric efficiency and dynamic leakage checks, to guarantee “out-of-the-box” reliability. We provide professional OEM customization for shafts, flanges, and specialized sealing, all backed by a comprehensive 12-month warranty to eliminate your downtime risks and ensure a high-quality, cost-effective hydraulic solution.

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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