BMS Series Hydraulic Orbit Motor | BMS-195 BMS-245 BMSZ BMSS | Danfoss OMS Alternative

The BMS Series high-pressure hydraulic orbit motors by Chengyuan Hydraulic are premium power components fully compatible with Danfoss OMS and Eaton 2000 series industrial standards. This versatile range, including models BMS-195, BMS-245, BMSZ-200, and BMSS-250, utilizes an advanced Disc Valve distribution logic and Geroler gear set design. Engineered for medium to heavy-duty applications under harsh conditions, the BMS series delivers massive torque while maintaining exceptional volumetric efficiency. As a signature product of Chengyuan, every BMS motor undergoes 100% simulated load testing to ensure 100% original-place interchangeability in mounting dimensions and operational performance.

Technical Specifications :

• Core Series: BMS (Standard), BMSZ (Wheel), BMSS (Short)

• Displacement Range: $80\text{ cm}^3/\text{rev}$ to $495\text{ cm}^3/\text{rev}$ (e.g., $195, 200, 245, 250$)

• Rated Operating Pressure: $17.5\text{–}20\text{ MPa (175–200 bar / 2500–2900 psi)}$

• Peak Pressure: $22.5\text{ MPa (225 bar / 3260 psi)}$

• Max Flow Rate: $75\text{–}100\text{ L/min}$

• Max Speed Range: $300\text{–}800\text{ rpm}$ (depending on displacement)

• Max Output Torque: Up to $1000\text{ N}\cdot\text{m}$ (Continuous)

• Sealing: High-pressure resistant NBR/FKM shaft seal

Key Technical Advantages:

• Geroler Gear Set Design: Unlike standard gerotors, the BMS series features a gear set with rollers, which drastically reduces mechanical friction during startup. This ensures smooth operation at low speeds without “juddering” and increases wear resistance by over 30%.

• Disc Valve Distribution Technology: The distribution disc is driven independently of the output shaft and automatically compensates for wear during operation. This ensures consistent volumetric efficiency under high pressure and minimizes heat generation from internal leakage.

• Reinforced Bearing Architecture: The standard BMS model is equipped with large tapered roller bearings capable of handling significant radial and axial loads. The BMSZ wheel version allows the load to be closer to the bearing center, making it ideal for direct wheel drives.

• BMSS Short Compact Integration: For space-constrained gearbox integrations or specialized attachments, the BMSS bearingless short design connects directly to the load shaft, significantly reducing the overall drivetrain length.

Application Areas:

• Agricultural Machinery: Harvester reel drives, seeder systems, and sprayer pump drives.

• Construction Equipment: Road sweeper brushes, mini-excavator travel drives, and auger systems.

• Industrial Attachments: Hydraulic winches, conveyor belt drives, and injection molding auxiliary drives.

Expert Maintenance Tips:

• Case Drain Management: Despite the high-pressure seal, it is highly recommended to connect the case drain port in high-shock or closed-loop systems. Maintain case backpressure below 2 MPa to protect the shaft seal.

• Pre-Lubrication at Startup: Before initial operation, fill the motor case with clean hydraulic oil. Run the motor at low speed with no load for 10–15 minutes to bleed air from the system before applying full load.

• Filtration Standard: Orbital motors are sensitive to fine particulates. We recommend a return filter of at least 20 microns, maintaining oil cleanliness to ISO 4406 19/17/14 standards.