Denison M5AF Hydraulic Vane Motor | M5AF018 Fixed Displacement Motor

Genlu Hydraulic proudly introduces our M5AF Series high-performance fixed displacement vane motors. Engineered to meet the rigorous standards of the classic Denison (Parker) M5AF series, these motors are specifically designed for high-efficiency industrial drives, winch systems, and heavy-duty mobile applications. Known for exceptional starting efficiency, smooth low-speed performance, and superior resistance to fluid contamination, the M5AF series effectively eliminates “stick-slip” issues in heavy mechanical transmissions. Genlu guarantees 100% Drop-in Interchangeability in mounting dimensions (SAE standards), drive shaft specifications, and port geometries compared to the original Denison units. Each motor is validated through 100% simulation load testing to ensure optimal breakaway torque and volumetric stability in harsh operational environments.

Technical Specifications 

• Product Series: Denison M5AF Series Fixed Displacement Vane Motor

• Key Configuration Models: M5AF-018-1R02-B1W, M5AF-018-2R01-B1W2

• Displacement: 18 cm³/rev (M5AF018)

• Rated Operating Pressure: 21 MPa (210 bar)

• Peak Pressure: 25 MPa (250 bar)

• Maximum Rated Speed: 3000 rpm

• Rotation: Bidirectional (R/L variants)

• Shaft Specification: Standard SAE splined or keyed shaft

• Operational Feature: Fixed displacement with integrated leak-compensation design

Key Technical Advantages:

• Signature Vane Self-Compensation Technology: Utilizes classic Denison vane compensation to maintain ideal contact pressure between vanes and the stator cam ring. This ensures peak volumetric efficiency even after extended service life.

• Superior Low-Speed Control: Unlike gear motors, the vane architecture allows for stable torque output at extremely low speeds (below 50 rpm), ensuring smooth operation without vibration or stick-slip.

• High Contamination Tolerance: Hardened internal rotating groups provide exceptional resilience against fluid-borne contaminants, making the M5AF series highly reliable even in environments with standard filtration.

• High Power-to-Weight Ratio: The compact housing design combined with high pressure ratings delivers maximum torque output in a minimal footprint, ideal for space-constrained machine designs.

Application Areas:

• Heavy Lifting & Winching: Marine/Land crane hoist drives, anchor windlasses, and drilling rig power mechanisms.

• Industrial Automation: Heavy conveyor drive systems and mixing station reduction drives.

• Mobile Machinery: Municipal street sweeper brush drives and auxiliary drives for specialized agricultural equipment.

Expert Maintenance Tips:

• Case Drain Installation: To prevent shaft seal blowout due to high case pressure, always connect the case drain port directly back to the reservoir, ensuring the motor casing remains at low pressure at all times.

• Pre-Priming is Mandatory: Before initial commissioning, flood the motor housing with clean hydraulic fluid through the top drain port. This ensures the vanes establish a protective oil film instantly upon startup, preventing dry-run damage.

• Thermal Monitoring: While the M5AF series is robust, maintain oil temperatures below 80°C. Prolonged operation at higher temperatures accelerates seal aging and vane wear; consider implementing an independent oil cooling circuit for heavy-duty systems.