Poclain MS Series Hydraulic Motor | MS02 MS05 MS08 MS11 MS18 MS25 Radial Piston Motor Replacement

Genlu Hydraulic proudly introduces our MS Series (covering MS02, MS05, MS08, MS11, MS18, and MS25 displacement frameworks) high-performance radial piston hydraulic motors. This series is engineered as a seamless, premium replacement for the classic Poclain MS series wheel and industrial motors. As the gold standard in Low-Speed High-Torque (LSHT) fluid power technology, these multi-cam lobe radial piston motors excel in both direct wheel drives for mobile vehicles and heavy-duty industrial rotary applications. Genlu guarantees 100% Drop-in Interchangeability regarding wheel mounting flanges, mechanical brake options, shaft splines, and port orientations compared to original Poclain units. Each motor assembly undergoes 100% simulation testing under dynamic load cycles to certify superior low-speed crawl smoothness, peak pressure stability, and torque efficiency profile compliance.

Technical Specifications 

• Product Series: Poclain MS Series Cam-Lobe Radial Piston Hydraulic Motor

• Key Frame Sizes: MS02, MS05, MS08, MS11, MS18, MS25

• Displacement Range: 172 cc/rev to 3000 cc/rev (depending on specific module layout)

• Rated Operating Pressure: 40 MPa (400 bar)

• Peak Operating Pressure: 45 MPa (450 bar)

• Max Rotation Speed: 100 rpm to 400 rpm (frame size and displacement configuration dependent)

• Max Output Torque: Up to 17,000 N·m (for the largest MS25 displacement variant)

• Displacement Modes: Standard Single Displacement / Dual Displacement (2-Speed Shiftable Control)

• Integrated Mechanical Brake: Optional multi-disc hydraulic parking brake matching OEM torque specs

Key Technical Advantages:

• Advanced Cam Ring Manufacturing: The multi-cam lobe stator ring is forged from high-strength alloy steel and machined via multi-axis CNC centers followed by deep induction hardening. This achieves premium surface matrix durability, eliminating chipping or pitting risks under heavy roller rolling pressures.

• Balanced Radial Piston Architecture: The radial arrangement means hydraulic vectors are perfectly symmetric and statically balanced across the rotor. This neutralizes net radial loads on internal bearings, delivering stutter-free, continuous smoothness even at velocities as low as 1 rpm.

• Outstanding Starting Torque Efficiency: Optimized tribological design at the piston-shoe and roller interfaces, coupled with a highly efficient flat-surface distribution valve plate, minimizes initial breakout friction, retaining a starting torque efficiency of over 90%.

• Compact Modular Vehicle Design: Integrated with heavy-duty twin-row tapered roller bearings, the housing functions effortlessly as a load-bearing wheel hub. It seamlessly houses structural wet multi-plate parking brakes, significantly optimizing overall chassis spatial envelopes.

Application Areas:

• Construction & Earthmoving Machinery: Road roller wheel drives, asphalt drum vibrators, skid-steer loader propulsion, and crawler drill rig undercarriages.

• Agriculture & Forestry Equipment: High-clearance crop sprayer wheel drives, harvester auxiliary traction systems, and forestry delimber feed wheels.

• Specialized Material Handling: Marine deck winches, Self-Propelled Modular Transporters (SPMT) drive wheels, and airport pushback tractors.

Expert Maintenance Tips:

• Case Flushing & Backpressure Management: The motor casing must remain fully filled with clean hydraulic fluid to lubricate the high-load roller-piston track. The case drain backpressure must be closely monitored and restricted to ≤0.15 MPa (1.5 bar) during steady operation to avoid shaft seal damage.

• 2-Speed Displacements Shifting Protocol: For dual-displacement models, switching between high-speed/low-torque and low-speed/high-torque requires a minimum pilot pressure of 1.2 MPa to 3.0 MPa at the 2C shift port. Shifting is strictly prohibited under overspeed coasting conditions.

• Fluid Cleanliness and Viscosity Auditing: Due to micro-matched distribution components, maintain system fluid filtration at ≤15µm (ISO 18/13 class or cleaner). In freezing environments, run a low-pressure warm-up routine to stabilize oil viscosity before running full load operations.