Product Overview
The MS02-8-123-R02-1120-YGHJ is a two-speed variable displacement model within the 02 frame size of Poclain Hydraulics’ MS Series multipurpose radial piston hydraulic motors. The MS Series is a direct drive hydraulic motor range ideal for wheel motor or tool drive applications, with displacements from 172cc/rev to 15000cc/rev, widely used in construction equipment, material handling, agricultural, environmental, mining, on rail, marine, and industrial sectors.
The MS02-MSE02 is the smallest frame size in the MS Series, with maximum displacement of 398cc/rev and up to 22 kW maximum power. The motor features a modular design for flexible configuration across demanding applications. The MS02 Series employs a radial piston cam design with low-speed, high-torque direct drive characteristics, achieving maximum speeds up to 900 rpm with multi-speed conception.
Model code breakdown: MS02 = MS Series size 02; 8 = dual displacement configuration; 123 = displacement code; R02 = brake/wheel mounting module; 1120 = wheel hub shaft output; YGHJ = variant suffix. The MS02 Series offers displacement options from 172cc/rev to 398cc/rev, covering both 2-displacement (two-speed) and 1-displacement (single-speed) configurations.
As a drop-in replacement, the motor is fully compatible with the OEM Poclain specification in mounting interface, port configuration, and performance characteristics, enabling direct replacement without hydraulic circuit or mounting bracket modification. Every unit undergoes 100% simulation-based testing prior to shipment, covering displacement calibration, torque output, pressure holding, and internal leakage.
Technical Specifications
All parameters below are based on Poclain Hydraulics official product technical documentation and verified supplier technical pages:
MS02-8-123-R02-1120-YGHJ Technical Specifications:
Complete Model: MS02-8-123-R02-1120-YGHJ
Brand: Poclain Hydraulics
Product Series: MS Series multipurpose radial piston motor
Product Type: Two-speed variable radial piston motor, wheel/tool direct drive
Max Displacement: 398 cm³/rev (24.3 cu.in/rev)
Displacement Options: 172 / 213 / 235 / 255 / 332 / 364 / 398 cm³/rev
Rated Working Pressure: 400 bar (5801 PSI)
Max Working Pressure: 450 bar (6527 PSI)
Peak Torque: 2500 N·m (1843 lb-ft)
Max Power: 22 kW (29.5 HP)
Max Speed (Multi-Speed Design): 900 rpm
Drive Type: Radial piston cam design
Mounting: Wheel mount / shaft mount
Motor Type: Wheel motor / shaft motor
Brake Type: Service brake / parking brake (optional)
Anti-Skid Feature: TwinLock™ (optional)
Hydraulic Fluid: Mineral oil-based hydraulic fluid
Application Markets: Construction equipment, material handling, agriculture, environment, mining, on rail, marine, industry
MS02 Series Other Displacement Specifications:
MS02-8 (172 cc/rev): Half displacement 86 cc/rev, max speed 700-900 rpm, power 18 kW
MS02-9 (213 cc/rev): Half displacement 107 cc/rev, max speed 570-720 rpm, power 18 kW
MS02-0 (235 cc/rev): Half displacement 118 cc/rev, max speed 520-650 rpm, power 18 kW
MS02-1 (255 cc/rev): Half displacement 128 cc/rev, max speed 480-610 rpm, power 18 kW
MS02-2 (332 / 364 / 398 cc/rev): Max speed 900 rpm, power 22 kW
Note: Specifications are based on Poclain Hydraulics official product technical documentation (poclain.com) and verified supplier technical pages (Alibaba, Made-in-China, Hidro-Kontrol, etc.). The MS02 Series features a modular design with model code options for displacement, mounting flange, brake, shaft output, and other configurations. Always verify against the complete model code and consult the latest Poclain official technical documentation during selection.
Key Technical Advantages
1. Radial Piston Cam Design for Low-Speed High-Torque Direct Drive
The MS02 employs Poclain’s classic radial piston cam design, delivering low-speed, high-torque direct drive characteristics. This design enables the motor to output high torque directly at the wheel end or tool end without additional gearbox reduction, simplifying the transmission system structure. The MS Series motors exhibit stability, reliability, and compactness in roller applications, facilitating the direct propulsion of the rollers’ drums and obviating the necessity for a gearbox.
2. Two-Speed Variable Function for Wide Operating Range Adaptability
The MS02-8-123 features a dual displacement (2C) configuration, allowing users to switch between two displacement settings to flexibly accommodate different travel speeds and torque requirements. Two-speed motors feature unique soft shifting behavior, providing greater operator comfort. Standard displacement configuration power is 18 kW, variable displacement priority rotation configuration is 12 kW, and no priority is 9 kW.
3. Modular Design for Flexible Configuration
The MS02 Series employs a modular design architecture, composed of torque displacement module, distributor module, brake/wheel mounting module, output shaft module, and other modules. Users can select different displacements, mounting flanges, brake types (service/parking), shaft output forms (wheel hub shaft/shaft motor), and other configurations based on specific application requirements. This modular design greatly enhances system integration flexibility and maintenance convenience.
4. Integrated Braking System and TwinLock™ Anti-Skid Function
The MS02 can be equipped with service and parking brake functions, with the brake module (R02) integrated into the motor structure, ensuring safety during slope parking and emergency braking. Additionally, the optional TwinLock™ anti-skid function is available, with the solution available from MS02 to MS50 and MHP11/13/17/20/27 motors, further enhancing equipment traction performance and safety on low-friction surfaces.
5. 100% Simulation-Based Testing and Drop-In Interchangeability
Every MS02-8-123 undergoes 100% simulation-based testing prior to shipment. Test protocols cover displacement calibration, torque output verification, pressure holding performance, and internal leakage detection. As a drop-in replacement, the motor is fully compatible with the OEM Poclain specification in mounting dimensions (R02 brake/wheel mounting module), port layout (1120 wheel hub shaft output), and performance characteristics, enabling direct replacement of the original motor. The product is widely used in SDLG and other brand rollers and graders for both OEM and aftermarket applications.
Application Areas
Compactor Travel Drive: Travel motors for SDLG and other brand vibratory and pneumatic tire compactors — the most typical and primary application of the MS02
Grader Assist Drive: Assist drive systems for SDLG G9220 and similar model graders, with VDF freewheeling valves for stable drive
Construction Equipment Wheel Drive: Wheel drive systems for mini excavators, skid steer loaders, and telehandlers
Material Handling Equipment: Travel drives for forklifts, stackers, and aerial work platforms
Agricultural Machinery: Travel drive systems for harvesters, sprayers, and other self-propelled agricultural equipment
Environmental Equipment: Travel drives for garbage compactors, sweepers, and road cleaning vehicles
Mining Equipment: Wheel drive motors for underground auxiliary transport vehicles and mining trucks
Railway & Marine: Hydraulic drive systems for track maintenance equipment and marine deck machinery
Expert Maintenance Tips
Pre-Installation Checks:
Verify mounting flange (R02 brake/wheel mounting module) alignment with equipment mounting surface; ensure surface is clean and free of burrs
Inspect port seals for damage and confirm compatibility with the hydraulic fluid in use
The motor must be fully filled with hydraulic oil via the housing drain port prior to installation to prevent dry friction damage to piston/cylinder during startup
Confirm brake (if equipped) release pressure meets system requirements; verify TwinLock™ function (if equipped) is operational
Operational Maintenance:
Use pressure filters with ≤ 10 μm filtration accuracy; maintain hydraulic oil cleanliness to required level
Recommended fluid: mineral oil-based anti-wear hydraulic oil; replace filter elements and oil at regular intervals
Periodically inspect motor exterior for leakage signs, focusing on shaft seal and port connections
Periodically monitor motor operating temperature and noise level; abnormal increase may indicate internal wear or fluid contamination
Verify housing drain line is unobstructed; return back pressure must not exceed allowable limits
Periodically check brake function and release pressure (if equipped); verify TwinLock™ anti-skid function is operational
Two-speed shifting function should be tested periodically to confirm smooth, shock-free switching
Troubleshooting Guide:
Motor fails to rotate or speed abnormal: Check hydraulic system supply pressure; verify directional valve and brake release are functioning properly; check oil cleanliness
Insufficient output torque: Confirm system pressure reaches rated value (400 bar continuous / 450 bar intermittent); inspect cam ring and pistons for wear
Abnormal noise or vibration: Check housing oil fill level; verify suction line is unobstructed; check mounting bolt tightness
External leakage: Inspect shaft seal for aging or damage; verify drain line back pressure is within allowable range
Two-speed switching failure: Check two-speed switching control signal reaches the motor correctly; verify switching valve spool is not stuck
Brake abnormality: Check brake release pressure; inspect brake friction plates for wear
