Product Overview
The MS/MSE series low-speed high-torque (LSHT) radial piston hydraulic motors are a flagship product line within the Poclain Hydraulics transmission platform, widely deployed in construction equipment, material handling, agricultural machinery, mining, railway, marine, and industrial applications for wheel motor and tool drive applications. Featuring an advanced radial piston cam ring design combined with disc valve distribution and hydrostatic balance technology, these motors deliver exceptional starting torque and smooth low-speed operation.
Designed to fully comply with Poclain MS/MSE series mounting and interface standards, these motors offer 100% direct interchangeability with original Poclain units—enabling plug-and-play replacement without any管路 modifications or adapter plates, significantly minimizing downtime and retrofit costs.
The MS/MSE series covers an ultra-wide displacement range from 172 cc/rev to 15,000 cc/rev. The MS02/MSE02 offers up to 398 cc/rev with 22 kW power; MS05/MSE05 offers up to 750 cc/rev with 50 kW power; MS08/MSE08 offers up to 1,248 cc/rev with 41 kW power; MS11/MSE11 offers up to 1,687 cc/rev with 50 kW power; MS18/MSE18 offers up to 2,812 cc/rev with 70 kW power; MS25 offers up to 3,006 cc/rev with 90 kW power. MS series operates at 450 bar working pressure, while MSE series operates at 400 bar.
The series features a modular design with single and dual displacement (multispeed) configurations, as well as optional service brakes, parking brakes, and Twin-Lock™ anti-skid systems. Every unit undergoes 100% factory testing under simulated real-world working conditions, validating pressure, flow, torque output, and performance characteristics before shipment—ensuring reliable operation from the very first start.
Model Code Interpretation (using MSE08-2-111-F09-2A50-EJ00 as an example) :
MSE – Series code: Radial piston hydraulic motor (MSE series, 400 bar working pressure)
08 – Size code: MS/MSE08 platform
2 – Displacement type: Dual displacement (2-speed) configuration
111 – Displacement code: Specific displacement configuration
F09 – Mounting flange and interface type
2A50 – Shaft and brake configuration
EJ00 – Special options and seal material code
Technical Specifications
MSE08-2-111-F09-2A50-EJ00
Model: MSE08-2-111-F09-2A50-EJ00
Type: Radial piston hydraulic motor (LSHT)
Maximum Displacement: 1,248 cm³/rev (76.1 in³/rev)
Available Displacement Range: 467 – 1,248 cm³/rev
Maximum Pressure: 450 bar (6,527 PSI)
Maximum Torque: 7,945 N·m (5,859 lb-ft)
Torque (@100 bar): 1,984 N·m
Maximum Power: 41 kW (55 HP)
Maximum Speed: 450 r/min
Displacement Type: Dual displacement (2-speed)
Brake Configuration: Service brake / Parking brake
Anti-skid Option: Twin-Lock™ available
Medium: Mineral oil, synthetic hydraulic oil
Operating Temperature Range: -40°C to +80°C (standard seals)
MS/MSE Series Maximum Specifications by Size :
MS02/MSE02: Max displacement 398 cc/rev, max power 22 kW, max torque 2,500 N·m, max speed 900 r/min
MS05/MSE05: Max displacement 750 cc/rev, max power 50 kW, max torque 4,770 N·m, max speed 700 r/min
MS08/MSE08: Max displacement 1,248 cc/rev, max power 41 kW, max torque 7,945 N·m, max speed 450 r/min
MS11/MSE11: Max displacement 1,687 cc/rev, max power 50 kW, max torque 10,700 N·m, max speed 200 r/min
MS18/MSE18: Max displacement 2,812 cc/rev, max power 70 kW, max torque 17,900 N·m, max speed 170 r/min
MS25: Max displacement 3,006 cc/rev, max power 90 kW
MS35: Max displacement 4,198 cc/rev, max power 110 kW
MS50: Max displacement 6,011 cc/rev, max power 140 kW
MS83: Max displacement 10,019 cc/rev, max power 200 kW
MS125: Max displacement 15,000 cc/rev, max power 240 kW
Key Technical Advantages
1. 100% Direct Interchangeability – Zero Modification Required
The MS/MSE series is engineered to exact Poclain mounting and interface specifications, with identical dimensions, port locations, and shaft end configurations. End users can replace original units directly without any管路 modifications or adapter plates—transforming unplanned downtime into scheduled, rapid maintenance while significantly reducing spare parts procurement costs and equipment downtime losses.
2. Radial Piston Cam Ring Design – Superior Starting Torque and Low-Speed Performance
The advanced radial piston cam ring design, combined with disc valve distribution and hydrostatic balance technology, delivers exceptional starting torque. The pistons move within the cam ring, generating high torque even at extremely low speeds. This design makes the MS/MSE series ideal for wheel drive and low-speed heavy-load applications.
3. Modular Design with Flexible Multi-Function Configuration
The MS/MSE series features a modular design with single displacement (1C) and dual displacement (2C) options for multispeed control. Optional service brakes, parking brakes, and Twin-Lock™ anti-skid systems are available. The modular architecture enables rapid adaptation to different applications from a single platform, significantly reducing inventory complexity and maintenance costs.
4. High-Pressure Capability with Long-Life Bearing System
MS series operates at 450 bar working pressure and MSE series at 400 bar—industry-leading pressure ratings in the radial piston motor class. The high-durability bearing design accommodates substantial external axial and radial loads. Reliable high-temperature shaft seals ensure long-term sealing performance under demanding operating conditions.
5. 100% Factory Testing Under Simulated Working Conditions
Every MS/MSE series unit undergoes rigorous factory testing under simulated real-world conditions, validating pressure, flow, torque output, volumetric efficiency, and thermal characteristics across the full operating range. Test media match actual operating conditions, ensuring each unit is ready for immediate installation and reliable operation upon delivery—eliminating the risk of “dead on arrival” components.
Application Areas
The MS/MSE series motors are widely deployed across the following industries and equipment types:
Construction Equipment: Excavator travel drives, rotary drilling rig power heads
Road Construction: Roller travel drives, asphalt pavers
Material Handling: Forklifts, port cranes, handling equipment
Agricultural Machinery: Combine harvester travel drives, large tractors
Mining Equipment: Mining machinery, rock drilling rigs
Railway Equipment: Railway engineering machinery
Marine & Shipbuilding: Marine winches, deck machinery
Industrial Equipment: Industrial tool drives, conveyors
Expert Maintenance Tips
1. Hydraulic Fluid Cleanliness Management
The MS/MSE series utilizes radial piston designs with minimal clearances between pistons and cylinder bores, making them highly sensitive to fluid contamination. It is recommended to install filters with ≤10μm filtration rating, maintaining fluid cleanliness to ISO 4406 19/17/14 or better. Never use degraded or substandard hydraulic fluids.
2. Air Bleeding Before Start-up
Always bleed air from the motor housing via the highest bleed screw before initial start-up or after extended shutdown periods to prevent cavitation damage. Use a waste oil collector to recover hydraulic fluid escaping during the filling process.
3. Case Drain and Backpressure Control
Ensure the case drain line is unrestricted with no flow restrictions. Excessive case backpressure will cause shaft seal damage and premature bearing failure. The drain line should return directly to the reservoir, not in parallel with the return line.
4. Rotation Direction Confirmation
Reversing the fluid flow direction will reverse the motor‘s direction of rotation. Verify that the system circuit direction matches the required rotation direction before installation.
5. Coupling Alignment Requirements
Maintain shaft alignment within 0.05 mm concentricity and 0.5° angular deviation between the drive shaft and the load shaft. Excessive misalignment will lead to premature bearing wear and shaft seal leakage. The use of flexible couplings is recommended to compensate for minor installation deviations.
6. Periodic Inspection and Maintenance
Inspect shaft seals for leakage and listen for abnormal operating noise every 1,000 operating hours or every 6 months (whichever comes first). If reduced torque output or abnormal operating noise is observed, timely overhaul of the piston assembly and valve plate is recommended.
