MS50-2-G11-R50-2A50-57EJ Poclain MS Series Radial Piston Hydraulic Motor

Product Overview

The MS50-2-G11-R50-2A50-57EJ is a high-displacement, low-speed high-torque (LSHT) direct-drive radial piston hydraulic motor from the Poclain MS multipurpose series. With a maximum displacement of 6011 cc/rev, power output up to 140 kW, and peak torque reaching 43,000 N.m, this motor is engineered for the most demanding heavy-duty applications.

Designed as a 100% interchangeable direct replacement for original Poclain MS50 series motors, this product matches OEM specifications in mounting dimensions, porting interfaces, and performance characteristics. Every unit undergoes 100% simulated duty cycle testing prior to shipment, validating volumetric efficiency, mechanical efficiency, and sealing integrity under actual operating load conditions.

The MS50 series has demonstrated exceptional reliability in tunnel boring machine (TBM) applications—powering cutting drives, screw conveyors, and erector rotation drives—with field-proven service life exceeding ten years in continuous operation.

Technical Specifications (Bulleted List)

• Model: MS50-2-G11-R50-2A50-57EJ

• Series: Poclain MS Multipurpose Radial Piston Motor

• Max Displacement: 6011 cc/rev

• Displacement Range: 3500 – 6011 cc/rev

• Max Working Pressure: 450 bar / 6527 PSI

• Max Torque: 43000 N.m

• Max Power Output: 140 kW

• Max Speed: 225 RPM

• Control Type: 2 Displacements (2C / Dual Displacement)

• Motor Type: Wheel Motor / Shaft Motor

• Brake Options: Service Brake / Parking Brake / Hydrostatic Boosted Brake

• Optional Feature: TwinLock™ Anti-Skid System

• Mounting Interface: 100% interchangeable with original Poclain MS50

Key Technical Advantages

1. High-Displacement Radial Piston Design for Extreme Torque Output
The MS50 series employs a proven radial piston architecture with displacement up to 6011 cc/rev, delivering 43,000 N.m of maximum torque at 450 bar operating pressure. This makes it the ideal choice for wheel motor and tool drive applications in heavy machinery.

2. Dual Displacement Multi-Speed Control for Optimized Efficiency
Supporting dual displacement (2C) control, this motor enables seamless switching between displacement settings to match speed and torque requirements across varying operating conditions. The multi-speed concept allows transition between low-speed high-torque and high-speed modes, significantly improving overall machine productivity.

3. 100% Interchangeability – Zero-Modification Drop-In Replacement
Manufactured to exact OEM mounting dimensions, porting specifications, and performance standards, this motor achieves 100% interchangeability with original Poclain MS50 units. No machine modifications are required—simply replace and resume operation, minimizing downtime and reducing maintenance costs.

4. Modular Design for Versatile Application Adaptation
The MS series features a highly modular architecture supporting both wheel motor and shaft motor mounting configurations, with optional service brakes, parking brakes, and TwinLock™ anti-skid systems. This flexibility enables rapid adaptation to construction equipment, material handling, agricultural machinery, mining equipment, rail systems, marine, and industrial applications.

5. 100% Simulated Duty Cycle Testing for Extreme Environment Reliability
Every motor undergoes 100% simulated duty cycle testing before shipment, validating performance under rated pressure, peak pressure, and maximum speed conditions. As verified in TBM applications, MS series motors deliver flawless operation for over a decade in the harshest environments.

6. Precision Machining and Premium Materials for Extended Service Life
Critical friction pairs are manufactured with precision grinding processes, complemented by high-capacity bearings and durable sealing elements, ensuring long-term reliability under high-load and high-impact conditions.

Application Areas

• Tunnel Boring Machines (TBM): Cutting drive, screw conveyor drive, erector rotation drive

• Construction Equipment: Wheel loaders, motor graders, rollers

• Mining Equipment: Underground LHDs, mining truck wheel drives

• Agricultural Machinery: Large self-propelled sprayers, harvester drives

• Material Handling: Port cranes, forklifts, AGV drives

• Rail & Marine: Railway maintenance machinery, marine deck machinery

Expert Maintenance Tips

1. Mounting Orientation: When installing the motor, ensure the motor case drain port (Port 1) is positioned at the highest point to guarantee proper lubrication and air bleeding.

2. Axial Clearance: Maintain axial clearance between the motor shaft and machine shaft to prevent additional axial loads on motor bearings.

3. Mounting Bolt Torque: Strictly follow the machine manufacturer’s recommended tightening torque. Poclain Hydraulics recommends calculating tightening torque per calculation sheet VD1230.

4. Spline Connection: Do not lubricate the motor shaft bore or the machine shaft outer diameter. Thoroughly clean and degrease both surfaces before installation.

5. Locking Sleeve Installation: For motors with locking sleeve shafts, pre-install the locking sleeve on the motor shaft per standard procedure, then carefully lift and mount the motor onto the machine shaft.

6. Seal Maintenance: Use the OEM-specification seal kit (B40970G) for MS50 shaft seals to ensure sealing performance and service life.

7. Case Drain Pressure Monitoring: Regularly monitor case drain pressure to ensure it remains within design limits, preventing excessive housing pressure that could damage shaft seals.

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