05817004 Bomag Hydraulic Motor MMF044 26MPa 18kg

Product Overview

The 05817004 is a swashplate-type axial piston fixed displacement motor built on the Sauer Danfoss MMF044 platform, in the MMF044 displacement size (44 cm³/rev). In the Bomag parts catalog, this motor is identified by part number 05817004, corresponding to the Sauer Danfoss MMF044 model and interchangeable with part numbers 7095926, 13197447, 55936824, 47002237, and 4700395386.

The 05817004 is the core hydraulic component of the Bomag road roller vibratory system, featuring a swashplate axial piston design specifically engineered to drive the vibration systems of heavy-duty compaction equipment. The motor is widely used in Bomag BW 211, BW 213, BW 203 series single drum rollers and tandem vibratory rollers. According to public data, the motor has a rated working pressure of 26 MPa and a weight of approximately 18 kg (some supplier data lists 50 kg, reflecting packaging or configuration differences), with plug-in mounting.

Engineered as a form-fit-function replacement for original Bomag 05817004 motors, this model maintains identical mounting flange dimensions, shaft specifications, and port locations, enabling drop-in interchangeability without modification to the host machine’s mounting interface or hydraulic circuit. Each unit undergoes 100% simulated load testing prior to shipment, validating output torque and volumetric efficiency against original specifications.

Technical Specifications

• Model: 05817004

• Original Brand: Bomag / Sauer Danfoss

• Alternative Part Numbers: 7095926, 13197447, 55936824, 47002237, 4700395386

• Sauer Danfoss Model: MMF044

• Series: Sauer Danfoss Series 40 MMF Fixed Motor Series

• Motor Type: Swashplate-type axial piston fixed displacement motor

• Design Feature: Swashplate configuration, parallel axial piston/slipper arrangement, fixed displacement

• Displacement: 44 cm³/rev (2.65 in³/rev)

• Rated Working Pressure: 26 MPa (260 bar / 3,771 psi)

• Maximum Pressure: 415 bar (41.5 MPa / 6,019 psi)

• Rated Speed (max displacement): 3,300 rpm

• Maximum Speed (max displacement): 4,100 rpm

• Case Pressure (continuous): 1.7 bar (25 psi)

• Case Pressure (maximum): 5.2 bar (75 psi)

• Mounting: Plug-in (SAE B two-bolt flange)

• Shaft Type: Splined / Tapered / Straight key (optional)

• Rotation: Bi-directional

• Weight (approx.): 18 kg (some supplier data lists 50 kg including packaging)

• Mass Moment of Inertia: 0.0032 kg·m²

• Loop Flushing: Optional

• Hydraulic Fluid: Standard hydraulic oil (ISO VG46 anti-wear recommended)

Key Technical Advantages

1. Swashplate Axial Piston Design with High Power Density

The 05817004 employs the classic swashplate design of the Sauer Danfoss Series 40 platform, with axial pistons and slippers arranged in parallel, changing piston stroke through a tiltable swashplate. Series 40 pumps/motors feature a compact, high power density design, achieving a displacement of 44 cm³/rev and a rated working pressure of 26 MPa at a weight of 18 kg. The swashplate configuration provides a compact axial dimension, suitable for the vibration systems of road rollers with limited installation space. The parallel piston/slipper arrangement ensures dynamic balance of the rotating group, reducing vibration and noise levels at high speeds.

2. High-Speed Capability for Vibratory Drive Optimization

The MMF044 achieves a rated speed of 3,300 rpm and a maximum speed of 4,100 rpm at maximum displacement; at minimum displacement, maximum speed reaches 4,850 rpm. This high-speed capability makes the MMF044 particularly suitable for applications requiring high-frequency vibration, such as road roller vibratory drives. Vibratory motors must achieve high-frequency reciprocating motion in short time intervals; the MMF044’s wide-range speed regulation and high-speed capability ensure stable output of vibration frequency, achieving optimal compaction results.

3. Fixed Displacement Stable Output with Bi-Directional Rotation

The fixed displacement design provides constant displacement, simple control logic, and stable operating characteristics. When used as a motor, output speed is proportional to input flow and inversely proportional to displacement; output torque is proportional to system pressure and displacement. The motor supports bi-directional rotation, with forward/reverse output shaft switching achieved by changing the swashplate direction, suitable for vibratory drive systems requiring frequent direction changes. The fixed displacement motor eliminates the need for complex variable adjustment mechanisms, reducing system integration complexity and maintenance risk.

4. Compact Structure with Multi-Standard Mounting Compatibility

The Series 40 MMF044 motor features a compact cast iron housing, with an SAE B two-bolt mounting flange conforming to industry standard interfaces. Shaft options include splined, tapered, and straight key configurations; port connections are available in side, twin, and axial configurations to suit different machine mounting requirements. An optional loop flushing valve helps with heat dissipation and smooth hydraulic flow, improving system efficiency under continuous duty conditions. The motor’s mounting dimensions, shaft interface, and port configuration are identical to original Bomag 05817004, enabling direct replacement.

Application Areas

• Bomag Single Drum Rollers: BW 211 series, BW 213 series soil compactors vibratory drive systems

• Bomag Tandem Vibratory Rollers: BW 203 tandem vibratory rollers vibratory drive systems

• Bomag Soil Compactors: BW 212, BW 214, BW 215, BW 216 series vibratory systems

• Road Construction Machinery: Various compaction equipment requiring high-frequency vibratory drives

• Material Handling: Other industrial drive applications requiring compact axial piston motors

The 05817004 has mature applications in Bomag BW 211, BW 212, BW 213, BW 214, BW 215, and BW 216 series road rollers, serving as a standard configuration motor for Bomag vibratory systems.

Expert Maintenance Tips

1. Mounting Alignment Requirements: The motor features plug-in (SAE B two-bolt flange) mounting. During installation, ensure the coaxiality deviation between the motor shaft and drive-end coupling does not exceed 0.05 mm. Although Series 40 motors are equipped with high-capacity roller bearings, excessive radial forces will accelerate bearing wear and shaft seal aging.

2. Case Pressure Control: The MMF044 has a continuous case pressure of 1.7 bar and a maximum case pressure of 5.2 bar. The drain port must be connected separately to the reservoir with back pressure not exceeding the maximum case pressure value; higher back pressure will damage the shaft seal and deform the housing. When used in series systems, ensure the return back pressure from upstream components does not exceed this limit.

3. Hydraulic Fluid Cleanliness and Viscosity Management: ISO VG46 anti-wear hydraulic oil is recommended. Maintain hydraulic fluid cleanliness at NAS Level 9 or better. Replace hydraulic fluid and filter elements every 1,000 operating hours or annually, with filter element filtration accuracy no less than 10 μm.

4. Vibratory Duty Special Notes: The 05817004 experiences high-frequency alternating loads in road roller vibratory drive applications. Inspect motor mounting bolt tightness and case drain leakage every 500 operating hours. If vibration amplitude increases abnormally, check the wear condition of piston/slipper pairs and swashplate surfaces.

5. Initial Startup and Extended Storage: Fill the motor housing with clean hydraulic fluid during initial installation to prevent dry friction on piston pairs during startup. For motors stored over 6 months, manually rotate the shaft 2–3 revolutions to confirm free rotation, then run at low pressure under no load for 10 minutes before gradually applying load.