OEM MS Series Orbit Motor | MS80 MS160 MS250 MS315 | High Torque Low Speed Hydraulic Motor

Chengyuan Hydraulic presents the MS Series (including MS80, MS160, MS250, and MS315), a lineup of Low Speed High Torque (LSHT) orbit motors specifically designed for rugged environments. This series optimizes the coordination between the disc valve and the Geroler gear set, ensuring that models like the MS160C/4 deliver exceptional low-speed stability and high mechanical efficiency. Chengyuan’s MS motors provide 100% Drop-in Interchangeability with international OEM standards regarding mounting dimensions, shaft specifications (C/4 denoting specific shaft/porting), and performance curves. Supported by our 100% Simulation Load Testing, every motor is verified for volumetric efficiency and thermal stability under rated pressure, guaranteeing reliable power delivery in high-pressure mobile and industrial applications.

Technical Specifications 

• Product Series: MS Series (MS80, MS125, MS160, MS200, MS250, MS315, MS400)

• Model Example: MS160C/4

• Displacement Range: 80.5 ml/r – 395 ml/r

• Rated Pressure: 14 MPa (140 Bar)

• Maximum Pressure (Intermittent): 17.5 MPa (175 Bar)

• Peak Pressure: 22.5 MPa (225 Bar)

• Max Torque: Up to 850 N.m (Model dependent)

• Max Speed: 150 – 800 r/min (Continuous)

• Shaft Type: Type C (32mm Cylindrical Keyed Shaft or others)

• Sealing Integrity: High-pressure shaft seal, allowing backpressure up to 10 MPa without a drain line.

Key Technical Advantages:

• Enhanced Geroler Gear Set: Featuring precision rollers in the stator-rotor assembly, this design minimizes startup friction and significantly boosts mechanical efficiency. It allows motors like the MS160 to maintain consistent torque output at ultra-low speeds (<10 r/min) without “stuttering.”

• High-Pressure Shaft Sealing: Equipped with premium-grade seals, the MS series handles significant case pressure. In most standard applications, the motor operates reliably without an external drain line, simplifying your hydraulic circuit design.

• Precise Disc Valve Logic: Compared to spool valve designs, the disc valve automatically compensates for wear, maintaining high volumetric efficiency over a long service life. The valve faces are super-finished to prevent internal bypass.

• Ductile Iron Heavy-Duty Housing: Cast from high-strength ductile iron (GGG50), the housing withstands sudden pressure spikes and provides superior fatigue resistance in demanding agricultural and construction machinery.

Application Areas:

• Material Handling: Crawler conveyors, hydraulic winches, and belt drives.

• Agricultural Machinery: Seeder rotation, sprayer drives, and small-scale harvesters.

• Municipal Vehicles: Street sweeper brushes, snow plow controls, and water truck pumps.

• Plastic Machinery: Mold adjustment systems for compact injection molding machines.

Expert Maintenance Tips:

• Initial Break-in: After installation, run the motor at 50% of the rated load for one hour. This helps establish an ideal lubricating film between the rollers and the rotor, extending operational life.

• Oil Viscosity Monitoring: The MS series requires an operating oil viscosity of 20-75 cSt. Low viscosity leads to increased internal leakage and accelerated wear on the disc valve.

• Radial Load Management: If using a sprocket or gear drive, verify the maximum allowable radial load on the output shaft. Excessive side load may necessitate an external bearing support to prevent premature seal failure.