MS02-2-123-F03-1120-YJP0 Poclain Radial Motor 235cc 450Bar

Product Overview

The MS02-2-123-F03-1120-YJP0 is a high-performance 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, MS version working pressure of 450 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 MS02-2-123-F03-1120-YJP0 belongs to the “2” displacement group within the MS02 frame size, with a displacement of 235 cc/rev. Model code breakdown: MS02 designates the 02 frame size radial piston motor in the MS Series; 2 indicates the displacement group (235 cc/rev); 123 specifies the mounting flange and shaft configuration; F03 defines port location and connection specification; 1120 specifies the control and valve body configuration; and YJP0 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 

MS02-2-123-F03-1120-YJP0:

• Series / Type: Poclain MS02 Series radial piston hydraulic motor

• Displacement group: Displacement Group 2

• Displacement: 235 cc/rev (14.3 cu.in/rev)

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

• Maximum working pressure: 450 bar (6,527 psi / 45 MPa)

• Rated pressure (continuous): 25 MPa (250 bar / 3,625 psi)

• Theoretical torque at 10 MPa: 374 Nm

• Rated torque: 750 Nm

• Maximum torque: 950 Nm

• Maximum power: 18 kW (standard displacement) / 22 kW (MSE version)

• Rated speed: 160 rpm

• Speed range: 0–285 rpm

• Direction of rotation: Bidirectional

• Mounting: Wheel flange mount / Shaft motor

• Output shaft: Splined shaft

• Brake: Service brake, parking brake, emergency brake options available

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

• Bearing arrangement: Double tapered roller bearings, accommodating radial and axial loads

• Housing material: High-strength cast iron

• Approximate weight: 39.5 kg (with brake configuration)

MS02/MSE02 Series displacement range (for reference):

• MS02-8: 172 cc/rev, theoretical torque 273 Nm, rated speed 200 rpm, rated torque 550 Nm, max torque 650 Nm

• MS02-9: 213 cc/rev, theoretical torque 339 Nm, rated speed 200 rpm, rated torque 700 Nm, max torque 850 Nm

• MS02-0: 235 cc/rev, theoretical torque 374 Nm, rated speed 160 rpm, rated torque 750 Nm, max torque 950 Nm

• MS02-1: 255 cc/rev, theoretical torque 405 Nm, rated speed 160 rpm, rated torque 800 Nm, max torque 1,000 Nm

• MSE02-0: 332 cc/rev, theoretical torque 528 Nm, rated speed 160 rpm, rated torque 1,100 Nm, max torque 1,300 Nm

• MSE02-1: 364 cc/rev, theoretical torque 579 Nm, rated speed 125 rpm, rated torque 1,150 Nm, max torque 1,450 Nm

• MSE02-2: 398 cc/rev, theoretical torque 633 Nm, rated speed 100 rpm, rated torque 1,300 Nm, max torque 1,600 Nm

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 authorized distributor technical data. For precise technical specifications of the MS02-2-123-F03-1120-YJP0, 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 MS02-2-123-F03-1120-YJP0 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. The motor maintains smooth operation even at extremely low speeds without stick-slip phenomena.

2. Modular Design for System Integration Flexibility

The MS/MSE02 Series features a highly modular design comprising output module, function module, flow-distribution module, and brake module, allowing customers to select configurations according to their actual requirements. The engineering value of the modular architecture lies in its ability to achieve different functional configurations (such as service brake, parking brake, emergency brake, dual displacement switching, etc.) 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™ integrated anti-skid system transfers torque from slipping wheels to wheels with greater grip on low-traction surfaces, significantly enhancing machine crossing capability and safety.

3. Precision Flow-Distribution Module for High Volumetric Efficiency

The MS/MSE02 Series flow-distribution module employs a disc-type valve plate design with automatic wear-compensation function, maintaining high volumetric efficiency over long-term operation. The function module applies sliding shoes featuring high load capacity, anti-friction, and heat-resistance performance, effectively reducing mechanical friction losses, while the optimized stator curve design improves running stability and impact resistance. The output module employs double tapered roller bearings to withstand stronger radial and axial forces, enabling the motor output shaft to directly absorb radial forces generated by driven components without requiring a separate bearing support housing.

4. Compact Structure and High Power Density

The MS/MSE02 Series achieves 235 cc/rev displacement capability and maximum power of 18–22 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. The compact structure enables high torque output within limited installation space.

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. The motor maintains smooth operation even at extremely low speeds 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

• Mining equipment: Mining mini loaders, underground transport vehicle drives, coal mine drills

• 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 MS02 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 MS02 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. 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 MS02 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.

4. Output Shaft Spline and Mounting Alignment

The MS02 uses wheel flange or shaft 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. Tighten mounting bolts in stages to the specified torque value and re-check torque after 500 operating hours.

5. Low-Speed Smoothness Monitoring and Maintenance

One of the MS02 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.

6. Restart Procedure After Extended Shutdown

If the motor has been idle for more than three months, manually rotate the output shaft to confirm freedom of movement, and inspect the case oil level and shaft seal for leakage before restarting. Extended shutdown can cause oil film drainage from piston-slipper interfaces, creating a dry-start risk. Before restarting, replenish clean hydraulic fluid through the case fill port and operate at low speed and reduced load for 10–15 minutes before returning to normal duty.

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