BMER Series Hydraulic Motor Replacement | BMER-2-300-WD BMER-2-475-WD

The BMER Series high-torque hydraulic drive motors manufactured by Chengyuan Hydraulic (directly interchangeable with White Drive / Danfoss RE Series) are robust power units specifically engineered for heavy-duty propulsion and industrial drive tasks. Utilizing the advanced Geroler® gear set technology, these motors optimize mechanical efficiency by minimizing friction between the star and the orbit. Whether configured as WD (Wheel Drive) for compact wheel mounting or WS (Standard) for versatile industrial tasks, Chengyuan ensures 100% original-place interchangeability with global brands. Focusing on models like BMER-2-300-WD and BMER-2-475-WD, our design integrates high-capacity bearings and pressure-compensated distribution plates to maintain high volumetric efficiency under extreme pressure. Every unit undergoes 100% simulated load testing to guarantee performance stability in the most demanding B2B environments.

Technical Specifications :

• Brand Compatibility: Interchangeable with White Drive RE series

• Technology Type: High-Torque Geroler Design

• Available Displacement Range:

  • BMER-160: 161.1 $cm^3/rev$

  • BMER-250: 252.0 $cm^3/rev$

  • BMER-300: 301.5 $cm^3/rev$

  • BMER-375: 371.4 $cm^3/rev$

  • BMER-400: 399.0 $cm^3/rev$

  • BMER-475: 475.2 $cm^3/rev$

• Maximum Continuous Pressure: 205 bar (3000 PSI)

• Maximum Intermittent Peak Pressure: 240 bar (3500 PSI)

• Max Torque (Model 475): 1050 Nm (Cont.) / 1260 Nm (Int.)

• Speed Range: Up to 470 rpm (Depending on displacement)

• Mounting Configuration Suffixes:

  • WD: Wheel Mount (Flange positioned for wheel hub integration)

  • WS: Standard / Spline Mount

• Shaft Options: 1-1/4″ Straight Keyed, 14T Spline, or 35mm Tapered shaft

• Porting: Standard SAE or Manifold ports available

Key Technical Advantages:

• Precision Geroler® Gear Set: The stationary outer gear is equipped with rollers that convert sliding friction into rolling motion. This results in a much lower startup pressure ($\le 0.5$ MPa) and significantly improves durability during frequent stop-start or reversing cycles.

• Superior Radial Load Capacity: The internal architecture features heavy-duty tapered roller bearings. In the WD wheel-mount configuration, the motor can sustain massive radial forces directly, making it suitable as a load-bearing drive shaft for skid steers or mowers without the need for additional support.

• Pressure-Compensated Valve Plate: The distribution valve uses an automatic pressure-balancing mechanism. This ensures that the gap between the valve and the rotor is optimized dynamically, maintaining volumetric efficiency above 90% even as pressure climbs.

• High-Pressure Triple Shaft Seal: Equipped with premium NBR/Viton shaft seals, the BMER series handles high backpressures effortlessly. The multi-lip design protects internal components from external contaminants like mud, dust, and water, extending the service life in harsh outdoor conditions.

Application Areas:

• Mobile Propulsion: Wheel drives for skid steer loaders, professional lawn mowers, and small agricultural vehicles.

• Sanitation & Municipal Gear: Drive units for street sweeper brushes, snow blowers, and wood chippers.

• Industrial Conveyance: Heavy-duty winches, conveyor drives, and industrial mixing equipment.

Expert Maintenance Tips:

• Mandatory Pre-Fill Command: Always fill the motor with clean hydraulic oil before initial startup. Running the Geroler set dry, even for a few seconds, can lead to catastrophic scoring of the distribution faces.

• Case Pressure Management: While the shaft seals are high-pressure rated, we recommend connecting a dedicated case drain line to the tank if backpressure is consistently high to lower housing temperature and maximize seal life.

• WD Shaft Inspection: For wheel-drive applications, check the mounting bolt torque regularly. Any misalignment or loose connection can cause vibration that degrades the internal tapered bearings prematurely.