MSE02-2-1LA-F03-2A81-YJKM Poclain Radial Motor 398cc 400Bar

Product Overview

The MSE02-2-1LA-F03-2A81-YJKM is the flagship radial piston hydraulic motor from the Poclain Hydraulics MS/MSE02 Series. The MS/MSE02 Series is the most power-dense compact direct drive motor within the Poclain MS Classic platform, featuring a displacement range from 172 to 398 cc/rev, maximum power of 22 kW (29.5 HP), maximum torque of 2,500 Nm, MSE version working pressure of 400 bar, and high speeds reached at 900 rpm through a multispeed 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 wheel drive and tool drive systems across construction equipment, material handling, agricultural machinery, environmental equipment, mining, rail, marine, and industrial applications.

The MSE02-2-1LA-F03-2A81-YJKM belongs to the “2” displacement group within the MSE02 frame size, with a full displacement of 398 cc/rev and a semi-displacement of 199 cc/rev in a dual displacement configuration. Model code breakdown: MSE02 designates the 02 frame size dual displacement motor in the MS Series (MSE version working pressure 400 bar; MS version 450 bar); 2 indicates the displacement group (full displacement 398 cc/rev); 1LA specifies the mounting flange and shaft configuration; F03 defines port location and connection specification; 2A81 specifies the control and valve body configuration; and YJKM indicates the special option code.

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 (Bulleted List)

MSE02-2-1LA-F03-2A81-YJKM:

• Series / Type: Poclain MS/MSE02 Series radial piston hydraulic motor, dual displacement

• Displacement group: Displacement Group 2

• Full displacement: 398 cc/rev (24.3 cu.in/rev)

• Semi-displacement: 199 cc/rev (12.1 cu.in/rev)

• Design: Radial piston cam-lobe design, working cylinders radially arranged around crankshaft

• Working pressure (MSE version): 400 bar (5,801 psi / 40 MPa)

• Maximum working pressure: 400 bar

• Peak pressure: 450 bar (MS version)

• Maximum torque (full displacement): 2,500 Nm (1,843 lb-ft)

• Maximum torque (semi-displacement): 1,260 Nm (930 lb-ft)

• Theoretical torque at 100 bar: 633 Nm (467 lb-ft)

• Maximum power: 22 kW (29.5 HP)

• Maximum speed (full displacement): 265 rpm

• Maximum speed (semi-displacement): 340 rpm

• Maximum speed (high-speed mode): 900 rpm (with multispeed concept)

• Direction of rotation: Bidirectional

• Mounting: Wheel flange mount (5xØ18 auf Ø140)

• Output shaft: Splined shaft

• Brake: Service brake and parking brake options available

• Anti-skid: TwinLock™ integrated anti-skid system compatible

• Housing material: High-strength cast iron

• Approximate weight: 36–41 kg (varies with configuration options)

MS02/MSE02 Series displacement range (for reference):

• MS02-8: 172 cc/rev (semi 86 cc/rev), max power 18 kW

• MS02-9: 213 cc/rev (semi 106 cc/rev), max power 18 kW

• MS02-0: 235 cc/rev (semi 118 cc/rev), max power 18 kW

• MS02-1: 255 cc/rev (semi 128 cc/rev), max power 18 kW

• MSE02-0: 332 cc/rev (semi 166 cc/rev), max power 22 kW

• MSE02-1: 364 cc/rev (semi 182 cc/rev), max power 22 kW

• MSE02-2: 398 cc/rev (semi 199 cc/rev), max power 22 kW

Note: The MS version operates at 450 bar working pressure; the MSE version at 400 bar. Displacement, pressure, torque, and speed data above are sourced from Poclain Hydraulics official technical manual and GS Global Resources technical data. For precise technical specifications of the MSE02-2-1LA-F03-2A81-YJKM, 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 MSE02-2-1LA-F03-2A81-YJKM 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. Piston force is applied directly 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 MSE02-2-1LA-F03-2A81-YJKM features a dual displacement configuration, capable of switching between full displacement (398 cc/rev) and semi displacement (199 cc/rev). At full displacement, the motor delivers maximum torque of 2,500 Nm for heavy-load starting and grade climbing. After switching to semi displacement, output speed increases approximately twofold at the same input flow, with maximum speed up to 900 rpm, suitable for rapid travel and transfer operations. The multispeed 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/MSE02 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 MS/MSE02 Series achieves 398 cc/rev displacement capability and maximum power of 22 kW within a compact housing, delivering 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) or used as a shaft motor, 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, backhoe loaders wheel drives, roller travel systems

• Material handling: Forklift travel drives, telehandlers, aerial work platform travel systems

• Agricultural machinery: Tractor wheel drives, combine harvester ground drives, self-propelled sprayers, mini farming vehicles

• Environmental equipment: Sanitation vehicle travel drives, street sweeper drives, snow blower drives

• Mining equipment: Mining mini loaders, underground transport vehicle drives

• Rail and marine: Suspended locomotives, ship deck auxiliary drives

• Tool drives: Drill, milling, and cutting tool rotary drives

Compatible equipment brands: Suitable for equipment from Bomag, Caterpillar, Volvo, JCB, Case, Komatsu, John Deere, Bobcat and comparable brands.

Expert Maintenance Tips

1. Fluid Cleanliness Management Is the Primary Task

The MS/MSE02 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 MSE02 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 MSE02-2 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 MSE02 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 MSE02 uses wheel flange mounting (5xØ18 auf Ø140). 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 MSE02 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.