MMF044DAFGABNGA Danfoss Axial Piston Motor 44cc 380bar

Product Overview

The MMF044DAFGABNGA, MMF044DAFHAHABNNN, MMF046CAKABANNN, and MMF046CAKBBBNNN are swashplate-type axial piston motors from the Danfoss (formerly Sauer-Danfoss) Series 40 MMF family. Featuring a proven swashplate design, these fixed-displacement, high-speed axial piston motors are engineered for closed-circuit hydrostatic transmissions.

Series 40 is one of Danfoss’s most classic hydrostatic product lines, covering single variable pumps (MPV), tandem pumps (MPT), fixed-displacement motors (MMF), and variable motors (MMV) with displacements ranging from 25 to 46 cm³/rev. The MMF series represents the fixed-displacement version, utilizing a parallel arrangement of axial pistons/slip shoes with a fixed swashplate. MMF044 indicates 44 cc/rev displacement, while MMF046 indicates 46 cc/rev displacement. The suffixes DAFGABNGA, DAFHAHABNNN, CAKABANNN, and CAKBBBNNN represent specific configuration codes corresponding to different shaft types, port configurations, and control options.

Designed as 100% interchangeable direct replacements for the original Danfoss Series 40 MMF motors, these products match OEM specifications in mounting dimensions, porting interfaces, and performance characteristics. Every unit undergoes 100% simulated duty cycle testing prior to shipment, validating volumetric efficiency, mechanical efficiency, and sealing integrity under actual operating load conditions.

MMF series motors are recognized for their high output speed, proven reliability, and excellent performance across agricultural machinery, construction equipment, material handling, and forestry applications.

Technical Specifications 

MMF044 Series (MMF044DAFGABNGA / MMF044DAFHAHABNNN)

• Model: MMF044DAFGABNGA / MMF044DAFHAHABNNN

• Series: Danfoss Series 40 MMF Swashplate Axial Piston Fixed Motor

• Geometric Displacement: 44 cm³/rev

• Rated / Continuous Pressure: 345–380 bar

• Peak / Maximum Pressure: 385–415 bar

• Rated Speed: 3300–4000 rpm

• Speed Range: 3300–5300 rpm

• Control Type: Fixed Displacement

• Direction of Rotation: Bi-directional

• Mounting Flange: SAE B

• Port Configuration: Side Twin Ports / Axial ports

• Shaft Type: Splined / Tapered / Straight Key

• Weight: Approx. 11 kg

MMF046 Series (MMF046CAKABANNN / MMF046CAKBBBNNN)

• Model: MMF046CAKABANNN / MMF046CAKBBBNNN

• Series: Danfoss Series 40 MMF Swashplate Axial Piston Fixed Motor

• Geometric Displacement: 46 cm³/rev

• Rated / Continuous Pressure: 345–380 bar

• Peak / Maximum Pressure: 385–415 bar

• Rated Speed: 3300–4000 rpm

• Speed Range: 3300–5300 rpm

• Maximum Speed: 4000–5300 rpm

• Control Type: Fixed Displacement

• Direction of Rotation: Bi-directional

• Mounting Flange: SAE B

• Port Configuration: Side Twin Ports

• Shaft Type: Splined

• Weight: Approx. 11–23 kg (configuration dependent)

Note: Pressure and speed parameters may vary across different configurations (shaft type, seal, porting, etc.). Please refer to the corresponding Danfoss Series 40 technical manual for specific model details.

Key Technical Advantages

1. Swashplate Fixed Displacement Design – High Speed and High Efficiency

The MMF series employs a proven swashplate axial piston architecture with parallel-arranged pistons/slip shoes and a fixed swashplate—simple in structure and highly reliable. The fixed displacement design eliminates the complexity of variable mechanisms, providing superior reliability and extended maintenance intervals under extreme operating conditions. Rated speeds reach 3300–4000 rpm with a speed range covering 3300–5300 rpm, meeting the demands of various high-load and continuous operation conditions.

2. High Pressure Rating with Compact Power Density

MMF series motors deliver rated pressures of 345–380 bar and peak pressures of 385–415 bar. With compact displacements of 44–46 cc/rev, they achieve exceptional power density—making them ideal for space-constrained mobile equipment requiring high-pressure output.

3. 100% Interchangeability – Zero-Modification Drop-In Replacement

Manufactured to exact OEM mounting dimensions, porting specifications, and performance standards, these motors achieve 100% interchangeability with original Danfoss Series 40 MMF units. No machine modifications are required—simply replace and resume operation, minimizing downtime and reducing maintenance costs.

4. 100% Simulated Duty Cycle Testing for Extreme Environment Reliability

Every motor undergoes 100% simulated duty cycle testing before shipment, validating performance under rated and peak pressure conditions—ensuring long-term reliability in demanding agricultural, construction, and mobile applications.

5. Wide Speed Range with Bi-Directional Rotation Capability

MMF series supports a wide speed range from 3300 to 5300 rpm, handling both low-speed high-torque and high-speed light-load requirements. Bi-directional rotation capability provides flexibility for applications requiring forward/reverse operation.

6. Modular Configuration for Versatile Application Adaptation

Series 40 MMF offers multiple shaft types (splined, tapered, straight key), port configurations (side Twin Ports, axial ports), and control options. This modular design enables rapid adaptation to combine harvesters, rollers, forwarders, sweepers, and other diverse applications.

7. Optional Loop Flushing Valve for Optimized Closed-Circuit Cooling

MMF series supports optional loop flushing valves, effectively reducing oil temperature in closed circuits and extending hydraulic component service life.

Application Areas

• Agricultural Machinery: Combine harvester travel drives, balers, self-propelled sprayers

• Construction Equipment: Roller travel drives, skid steers

• Road Construction: Road milling machines, soil stabilizer travel drives

• Material Handling: Forklift travel drives, AGV drives

• Forestry Machinery: Forwarder travel drives, sweeper main brush rotation drives

• Turf Maintenance: Turf machinery hydraulic drives

• Specialty Vehicles: Airport ground support equipment, municipal vehicles

Expert Maintenance Tips

1. Pre-Installation Preparation: Before using the MMF series motor, read and understand the complete Danfoss Series 40 instruction manual. For first commissioning, fill the motor housing with hydraulic fluid using a filling unit with filtration not less than 10 µm. Never operate the motor without fluid.

2. Case Drain Pressure Control: Series 40 MMF motors have a maximum working case pressure of 1.7 bar and a maximum allowable pressure of 5.2 bar. Ensure the case drain line is unobstructed and returns to a separate oil tank to prevent seal damage from excessive housing pressure.

3. Oil Cleanliness Control: MMF series motors require high fluid cleanliness. Recommended system filtration not less than ISO 4406 18/13. Regular oil analysis is recommended with filter change intervals adjusted based on contamination levels.

4. Coupling Alignment: Precise alignment between the motor shaft and drive shaft is required with minimal tolerance. After installation, manually rotate the coupling to verify smooth operation.

5. Flushing Valve Maintenance: For models equipped with flushing valves, regularly inspect the valve’s cracking pressure and flow rate to ensure adequate oil cooling and filtration in the closed circuit.

6. Regular Inspection Schedule: Regular inspection of the hydraulic system and axial piston unit is recommended. Check hydraulic fluid level daily and monitor operating temperature, noise levels, and case drain flow regularly. Abnormal increases may indicate internal wear or seal degradation.

7. Operating Temperature Control: Ensure the hydraulic system operating oil temperature remains within the recommended range (30–90°C) to prevent viscosity reduction and seal degradation from excessive temperatures.