Product Overview
The MS11-0-121-A11-1830-EJ00 is a high-performance radial piston hydraulic motor from the Poclain Hydraulics MS/MSE11 Series. The MS/MSE11 Series represents the highest power class within the Poclain MS Classic platform, achieving a maximum displacement of 1,687 cc/rev, maximum power of 50 kW, maximum torque of 10,700 Nm, and high speeds up to 200 rpm through a multispeed design concept. Through its compact radial piston cam-lobe architecture, modular design philosophy, and outstanding low-speed high-torque characteristics, this series has been extensively validated in drive systems for construction equipment, material handling, agricultural machinery, mining equipment, and rail applications worldwide.
The MS11-0-121-A11-1830-EJ00 belongs to the “0” displacement group within the MS11 frame size, with a full displacement of 1,048 cc/rev and a semi-displacement of 524 cc/rev in a dual displacement configuration. Model code breakdown: MS11 designates the 11 frame size radial piston motor in the MS Series; 0 indicates the displacement group (1,048 cc/rev); 121 specifies the mounting flange and shaft configuration; A11 defines port location and connection specification; 1830 specifies the control and valve body configuration; and EJ00 indicates the brake or special option configuration. The motor is manufactured to original Poclain Hydraulics specifications with 100% drop-in interchangeability, requiring no modification to mounting interfaces, port positions, or hydraulic connections. Every unit undergoes 100% simulated operating condition testing at the factory, including rated pressure loading, volumetric efficiency verification, seal integrity assessment, and low-speed smoothness validation prior to shipment.
Technical Specifications
MS11-0-121-A11-1830-EJ00:
Series / Type: Poclain MS11 Series radial piston hydraulic motor, dual displacement
Displacement group: Displacement Group 0
Full displacement: 1,048 cc/rev (63.9 cu.in/rev)
Semi-displacement: 524 cc/rev (32.0 cu.in/rev)
Design: Radial piston cam-lobe design, working cylinders radially arranged around crankshaft
Rated pressure (continuous): 25 MPa (250 bar / 3,625 psi)
Maximum pressure (intermittent): 40 MPa (400 bar / 5,800 psi)
Peak pressure: 45 MPa (450 bar / 6,527 psi)
Rated torque: 3,916 Nm (at 10 MPa pressure differential)
Maximum torque: approximately 4,700 Nm (MS11 Series maximum 10,700 Nm; refer to specification table for Group 0)
Rated speed: 65 rpm
Speed range: 0–160 rpm
Maximum power: 44 kW (MS11 Series maximum 50 kW)
Direction of rotation: Bidirectional
Mounting: Wheel flange mount
Brake: EJ00 configuration (with brake option)
Anti-skid: TwinLock™ integrated anti-skid system compatible
Housing material: High-strength cast iron
Approximate weight: 85–110 kg (varies with configuration options)
MS11/MSE11 Series displacement range (for reference):
MS11-7: 730 cc/rev, semi 365 cc/rev
MS11-8: 837 cc/rev, semi 418.5 cc/rev
MS11-9: 943 cc/rev, semi 471.5 cc/rev
MS11-0: 1,048 cc/rev, semi 524 cc/rev
MS11-1: 1,147 cc/rev, semi 573.5 cc/rev
MS11-2: 1,259 cc/rev, semi 629.5 cc/rev
MSE11-9: 1,263 cc/rev, semi 631.5 cc/rev
MSE11-0: 1,404 cc/rev, semi 702 cc/rev
MSE11-1: 1,536 cc/rev, semi 768 cc/rev
MSE11-2: 1,687 cc/rev, semi 843.5 cc/rev
Note: The MS version operates at 450 bar working pressure; the MSE version operates at 400 bar. For precise technical specifications of the MS11-0-121-A11-1830-EJ00, always consult the official Poclain Hydraulics technical manual or the product nameplate data.
Key Technical Advantages
1. Radial Piston Cam-Lobe Principle for High Starting Torque
The MS11-0-121-A11-1830-EJ00 employs Poclain’s signature radial piston cam-lobe architecture, with working cylinders arranged radially around the crankshaft and pistons converting radial force into crankshaft rotational torque through the cam ring. The engineering advantage of this design lies in the direct application of piston force to the crankshaft eccentricity, maximizing the moment arm and enabling extremely high starting torque even at very low speeds. The motor features high starting torque characteristics. Unlike axial piston motors, the radial piston design delivers maximum torque instantaneously upon startup without requiring oil film pressure build-up, making it ideally suited for wheel drive applications involving frequent start-stop cycles and heavy-load starting.
2. Dual Displacement Switching and Multi-Speed Drive Capability
The MS11-0-121-A11-1830-EJ00 features a dual displacement configuration, capable of switching between full displacement (1,048 cc/rev) and semi displacement (524 cc/rev). At full displacement, the motor delivers maximum torque for heavy-load starting and grade climbing. After switching to semi displacement, output speed can be approximately doubled at the same input flow, suitable for rapid travel and transfer operations. This dual-speed concept enables a single motor to cover both low-speed high-torque and high-speed light-load operating requirements without additional gearboxes or reduction mechanisms, simplifying drivetrain design.
3. Modular Design for System Integration Flexibility
The MS/MSE11 Series features a highly modular design with flexible configuration options for wheel flanges, shaft ends, brake types (service brake, parking brake), and the TwinLock™ integrated anti-skid system. The engineering value of the modular architecture lies in its ability to achieve different functional configurations by replacing end cap modules rather than the entire motor. For equipment manufacturers requiring multiple drive configurations, this design significantly simplifies spare parts management and system integration complexity. The TwinLock™ anti-skid function effectively prevents vehicle rollback on slopes or low-traction surfaces, enhancing machine safety.
4. Compact Structure and High Power Density
The MS11 Series achieves 1,048 cc/rev displacement capability within a compact housing, with maximum power up to 50 kW — a power density that leads its class among low-speed high-torque radial piston motors. The motor can be installed directly within wheel hubs (wheel drive applications), with output shaft bearings accommodating simultaneous radial and axial external loads, eliminating the need for separate bearing support housings and simplifying system design while reducing installation costs.
5. Low Noise and Smooth Low-Speed Operation
The radial piston cam-lobe structure maintains stable oil film load-bearing capacity at low speeds, with smooth piston commutation and precision flow distribution through the cam ring profile, achieving smooth output and low noise across the full speed range. Even at extremely low speeds, the motor maintains smooth operation without stick-slip phenomena — critical for travel drive applications requiring precise speed control.
Application Areas
Construction equipment: Skid steer loaders, mini loaders, roller travel drives, road milling machine auxiliary drives
Material handling: Forklift travel drives, telehandlers, aerial work platform travel systems
Agricultural machinery: Tractor wheel drives, combine harvester ground drives, self-propelled sprayers
Mining equipment: Mining mini loaders, underground transport vehicle drives, directional drilling rigs
Rail and marine: Suspended locomotives, ship deck auxiliary drives
Environmental equipment: Sanitation vehicle travel drives, street sweeper drives
Tool drives: Drill, milling, and cutting tool rotary drives
Compatible equipment brands: Suitable for equipment from Caterpillar, Volvo, JCB, Case, Komatsu, John Deere, Case IH, New Holland, Fendt, Claas, Amazone, Agrifac and Hardi.
Expert Maintenance Tips
1. Fluid Cleanliness Management Is the Primary Task
The MS11 Series operates with micron-level clearances between radial pistons and the cam ring, and between pistons and cylinder bores. Particulate contamination in hydraulic fluid is the leading cause of piston scoring and cam ring wear. Systems must be equipped with filtration rated to ISO 4406 18/16/13 or better. In high-contamination environments such as mining or construction job sites, consider increasing filtration to ISO 4406 17/15/12 and shortening filter replacement intervals to 500–800 hours.
2. Case Drain Line Configuration Requirements
Case drain from the MS11 motor must be routed to the reservoir through the highest drain port, with case pressure strictly controlled within specified limits. Excessive case pressure will cause shaft seal failure; insufficient pressure will reduce lubrication and heat rejection effectiveness. The case drain line must terminate below the minimum oil level in the reservoir to maintain positive return flow under all operating conditions. For models equipped with a brake, the brake leakage oil circuit should drain independently and must not share the motor case drain line.
3. Dual Displacement Switching Mechanism Maintenance
For the dual displacement MS11-0 configuration, periodically inspect the displacement switching valve response characteristics and seal condition. The switching valve actuation pressure must be set to the value specified in the Poclain technical manual. If displacement switching lag or failure to actuate is observed, it may indicate switching spool sticking or control oil circuit blockage, warranting timely inspection. All switching mechanism seals should be replaced during any teardown procedure.
4. Pre-Start Case Filling and Air Purging
Before first startup after installation or repair, the motor case must be filled with clean hydraulic fluid through the highest case port until fluid overflows. The MS11 radial piston architecture creates a complex internal case cavity geometry; starting an un-purged motor can cause dry friction damage between piston ball ends and the cam ring, leading to irreversible premature wear.
5. Output Shaft Spline and Mounting Alignment
The MS11 uses wheel flange mounting. During installation, verify that the output shaft spline is properly aligned with the mating component, and that spline engagement length meets design requirements. Installation misalignment will cause abnormal spline wear and bearing side loading, significantly shortening service life. For wheel drive applications, pay particular attention to the concentricity between the wheel hub and motor flange.
6. Low-Speed Smoothness Monitoring and Maintenance
One of the MS11 Series’ core advantages is smooth low-speed operation. If crawling or vibration is observed at extremely low speeds, it may indicate increased piston-to-bore clearance, cam ring wear, or flow distribution surface sealing degradation. Record the minimum smooth operating speed under standard conditions quarterly as a trend monitoring baseline; deviation exceeding 15% from the initial value warrants inspection.
