MS08-0-125-R08-1120-EJ00 Poclain Hydraulic Motor 780cc LSHT

Product Overview

The MS08-0-125-R08-1120-EJ00 is a low-speed high-torque radial piston hydraulic motor built on the Poclain MS/MSE08 modular platform, in the MS08-0 displacement group (780 cc/rev full displacement, 390 cc/rev half displacement). The motor features a radial piston cam ring design, specifically engineered for wheel motor or tool drive applications, and represents the largest displacement group within the MS08 series. The MS08 series direct-drive motor delivers up to 41 kW, with a displacement range of 467 to 1,248 cc/rev, maximum working pressure of 400–450 bar, maximum torque of 7,945 N·m, and a multi-speed design reaching speeds up to 450 rpm.

The model code MS08-0-125-R08-1120-EJ00 decodes as follows: MS08 designates the series (MS multipurpose motor series), 0 is the displacement group code (full/half displacement = 780/390 cc/rev), 125 is the distribution shaft module code, R08 is the wheel mounting flange code, 1120 is the brake module configuration code (no brake), and EJ00 is the output shaft and port configuration code. R08 designates the standard wheel mounting flange configuration, with mounting flange dimensions of 8xØ22 on Ø203.2 mm pitch circle diameter. The 1120 code corresponds to the standard wheel mounting configuration without an integrated brake.

Engineered as a form-fit-function replacement for original Poclain MS08-0 series motors, this model maintains identical mounting flange dimensions, shaft specifications, and port locations, enabling drop-in interchangeability. Core components are manufactured from imported materials and completed through precision machining centers. Every unit undergoes 100% simulated load testing prior to shipment, validating output torque and volumetric efficiency against original specifications.

Technical Specifications 

• Model: MS08-0-125-R08-1120-EJ00

• Series: Poclain MS/MSE08 modular hydraulic motor

• Motor Type: Low-speed high-torque radial piston motor (LSHT)

• Design Feature: Radial piston cam ring, dual-displacement switching, modular design

• Full Displacement: 780 cc/rev (47.6 cu.in/rev)

• Half Displacement: 390 cc/rev (23.8 cu.in/rev)

• Displacement Ratio: 2:1 (dual-displacement switching)

• Rated Pressure: 25 MPa (250 bar / 3,625 PSI)

• Maximum Pressure: 40 MPa (400 bar / 5,801 PSI)

• Peak Pressure: 450 bar (6,527 PSI, with multispeed conception)

• Rated Torque: 2,914 N·m (2,149 lb-ft)

• Theoretical Torque at Δp=10 MPa: 1,166 N·m (full displacement) / 571 N·m (half displacement)

• Rated Speed: 70 rpm

• Speed Range: 0–170 rpm

• Maximum Power: 36 kW (48 HP)

• Rotation: Bi-directional

• Mounting: Wheel mounting (R08 standard wheel flange, 8xØ22 on Ø203.2)

• Brake Option: 1120 code — no integrated brake

• Optional Features: Speed sensor, parking brake, flushing valve, Twin-Lock™ anti-skid system

• Weight (approx.): Varies by configuration; confirm with manufacturer

Key Technical Advantages

1. Radial Piston Cam Ring Design with High Starting Torque

The MS08-0-125 employs Poclain’s classic radial piston cam ring design, with multiple pistons radially arranged inside the cam ring, converting radial piston motion into rotational output through roller-type force transmission. This design enables the motor to deliver maximum torque at startup, with no difference between starting torque and running torque, operating smoothly at speeds as low as 1 rpm without stick-slip or speed fluctuation. MS series motors have established themselves as a benchmark in the hydraulic motor market through their high efficiency and ability to run smoothly at very low speeds.

2. Dual-Displacement Switching with Multi-Speed Drive Capability

An integrated dual-displacement control valve enables switching between 780 cc/rev full displacement and 390 cc/rev half displacement via an external pilot pressure signal. Full-displacement mode delivers a maximum torque of 2,914 N·m, suitable for heavy-load starting and climbing conditions; switching to half displacement doubles the output speed for no-load fast travel or light-load high-speed operation. The multispeed conception enables a maximum speed of 170 rpm, significantly improving over conventional LSHT motors. The mechanism allows displacement changes without motor disassembly, enhancing overall machine adaptability.

3. Modular Design with Flexible Configuration

The MS08 series employs Poclain’s signature modular architecture, comprising torque module, distribution shaft module, mounting flange module, and brake module, with standardized interfaces between modules. The MS08 series shares mounting interfaces and control modules with other MS series products including MS02, MS05, and MS11, enabling machine manufacturers to flexibly switch between different displacement requirements. Optional modules include parking brakes, speed sensors, and flushing valves, with individual component replacement possible during maintenance or upgrade. The MS08 series offers multiple mounting configurations, with the R08 standard wheel mounting flange suitable for direct wheel drive applications.

4. High Power Density with Wheel Drive Optimization

The MS08-0-125 delivers a maximum power output of 36 kW and a rated torque of 2,914 N·m at 780 cc/rev displacement, offering the highest power density in the MS08 series. The R08 wheel mounting flange (8xØ22 on Ø203.2) is specifically designed for wheel drive applications, enabling direct installation into the wheel hub without couplings or drive shafts, simplifying the machine’s transmission system. The motor accommodates substantial radial and axial loads, suitable for wheel drive applications in wheel loaders, road rollers, and drilling rigs. The MS08 series has been field-validated in forestry machinery applications, such as the Suffel Smartskidder winch powered by an MS08 motor.

Application Areas

• Construction Machinery: Skid steer loader wheel drives, road roller travel drives, mini excavator travel drives, cold planers

• Mining Equipment: Coal mine drills, scraper conveyors, heavy-duty handling vehicles

• Agricultural Machinery: Combine harvester travel drives, self-propelled sprayers, cotton pickers

• Forestry Machinery: Forwarder winch drives, harvester travel drives

• Material Handling: Forklift drives, aerial work platforms, conveyors

• Municipal & Environmental Equipment: Road sweepers, refuse compactors

MS08 series motors are widely used across construction equipment, material handling, agricultural, environmental, mining, rail, marine, and industrial markets.

Expert Maintenance Tips

1. Mounting Alignment Requirements: The R08 wheel mounting flange has bolt holes distributed as 8xØ22 on Ø203.2 mm pitch circle diameter. During installation, ensure the flange face is clean and free of burrs, and tighten bolts diagonally to the specified torque. The mating surface between the motor shaft and wheel hub should be clean and coated with appropriate grease to prevent corrosion that could hinder future disassembly.

2. Initial Startup Preparation: Fill the motor housing with clean hydraulic fluid during initial installation to prevent dry friction on piston pairs and cam ring during startup. The drain port (L port) must be connected separately to the reservoir with back pressure not exceeding 0.5 MPa; higher back pressure will damage the shaft seal and deform the housing.

3. Dual-Displacement Switching Mechanism Maintenance: Periodically verify the dual-displacement switching valve response pressure. Conduct switching tests every 500 operating hours using 3–5 MPa pilot pressure to ensure crisp, non-sticking actuation. If switching is sluggish, check pilot circuit pressure and valve spool wear.

4. Hydraulic Fluid Cleanliness and Change Intervals: Maintain hydraulic fluid cleanliness at ISO 18/15 or NAS Level 9 or better. Replace hydraulic fluid and filter elements every 1,000 operating hours or annually, with filter element filtration accuracy no less than 10 μm.

5. Restart After Extended Storage: For motors stored over 6 months, manually rotate the shaft 2–3 revolutions to confirm free rotation, then run at low pressure (5 MPa) under no load for 10 minutes, confirming normal case temperature and leakage before gradually applying load.

6. Case Drain Leakage Monitoring: Inspect case drain leakage every 500 operating hours; normal leakage should remain below 2 L/min. A sudden increase indicates potential wear on piston pairs or the distribution plate.

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