Product Overview
The MS08-2-15A-R08-1120-57EDJM is a dual-displacement radial piston hydraulic motor from Poclain Hydraulics’ MS/MSE08 series, featuring a full displacement of 934 cc/rev and a half displacement of 467 cc/rev with an integrated parking brake (EDJM option). It is designed for wheel-drive and tool-drive applications requiring high torque at low speed.
The MS/MSE08 series is the mid-large frame offering in Poclain’s multi-purpose motor line, covering displacements from 467 to 1,248 cc/rev with up to 41 kW of power, 7,945 N·m maximum torque and 450 bar maximum pressure (MS version) / 400 bar (MSE version), with a multi-speed concept reaching up to 450 rpm. The series employs a modular design concept allowing a single base motor to be configured with different displacement groups, flow-distribution modules, brake modules and output-end modules, serving construction equipment, material handling, agriculture, environment, mining, rail, marine and industry.
The model code breaks down as follows: MS08 identifies the MS series 08 frame size; 2 denotes the displacement group (934/467 cc/rev dual displacement); 15A is the flow-distribution/function module (1=single displacement valving, 5=standard configuration, A=valving cover type); R08 is the output-end/mounting configuration (R=radial bearing support, 08=flange specification); 1120 is the shaft and mounting flange code (1=without mounting bearing support, 1=5×Ø18 on Ø140 flange, 2=with studs and nuts); 57EDJM denotes additional options (5=brake specification, 7=shaft seal type, E=electrical control interface, D=dual displacement, J=surface heat treatment on shaft, M=high speed or reduced charge pressure).
Every unit undergoes 100% simulated operating-condition bench testing prior to shipment. Mounting flange, shaft end and port dimensions match the original Poclain MS08 series exactly, enabling true drop-in interchangeability with zero modification required.
Technical Specifications
MS08/MSE08 Series Frame Size Specifications:
MS08-8: Full displacement 627 ml/r, half displacement 313 ml/r, theoretical torque at 10 MPa 937 N·m, rated torque 2,343 N·m, rated pressure 25 MPa, max pressure 40 MPa, rated speed 70 rpm, speed range 0–170 rpm
MS08-9: Full displacement 702 ml/r, half displacement 351 ml/r, theoretical torque at 10 MPa 1,049 N·m, rated torque 2,623 N·m, rated pressure 25 MPa, max pressure 40 MPa, rated speed 70 rpm, speed range 0–170 rpm
MS08-0: Full displacement 780 ml/r, half displacement 390 ml/r, theoretical torque at 10 MPa 1,166 N·m, rated torque 2,914 N·m, rated pressure 25 MPa, max pressure 40 MPa, rated speed 70 rpm, speed range 0–170 rpm
MS08-1: Full displacement 857/429 ml/r, theoretical torque at 10 MPa 1,281 N·m, rated torque 3,202 N·m, rated pressure 25 MPa, max pressure 35 MPa, rated speed 65 rpm, speed range 0–155 rpm
MS08-2 (This Model): Full displacement 934/467 ml/r, theoretical torque at 10 MPa 1,396 N·m, rated torque 3,490 N·m, rated pressure 25 MPa, max pressure 35 MPa, rated speed 65 rpm, speed range 0–140 rpm
MSE08 (Series): Full displacement 1,043–1,248 ml/r, max torque 6,680–7,950 N·m, max pressure 400 bar
MS08/MSE08 Series Common Specifications:
Series Max Displacement: 1,248 cc/rev (76.1 cu.in/rev)
Series Max Torque: 7,945 N·m (5,859 lb-ft)
MS Series Max Working Pressure: 450 bar (6,527 psi)
MSE Series Max Working Pressure: 400 bar (5,801 psi)
Series Max Power: 41 kW (55 HP)
Series Max Speed: 450 rpm
Type: Radial piston LSHT hydraulic motor
Control: Single or dual displacement
Brake: Service brake and parking brake options
Motor Type: Wheel motor / shaft motor (modular)
Anti-Skid Option: TwinLock™ available
Displacement Range: 467–1,248 cc/rev
Original Design: Poclain Hydraulics, France
MS08-2-15A-R08-1120-57EDJM Additional Specifications:
Model Code: MS08-2-15A-R08-1120-57EDJM
Cam Configuration: Dual displacement cams, 934/467 ccm
Valving Type: 1 displacement valving
Mounting Flange: 5×Ø18 on Ø140
Shaft Type: With studs and nuts
Brake Configuration: Integrated parking brake module
Front Unit: Without mounting bearing support
Options: Electrical control interface, dual displacement control, surface heat treatment on shaft, high speed or reduced charge pressure
Max Speed: 140 rpm
Max Pressure: 450 bar
Rated Pressure: 25 MPa
Weight: ~45–55 kg (depending on configuration)
Key Technical Advantages
1. Dual Displacement Cam Ring Design for Wide Operating Range
The MS08-2 features a dual-displacement cam ring design with on-line switching between 934 cc/rev full displacement and 467 cc/rev half displacement. The full-displacement mode delivers 3,490 N·m rated torque for heavy-duty startup and grade climbing; the half-displacement mode significantly increases speed capability (up to 140 rpm) for light-load cruising. A single motor covers the full spectrum from low-speed high-torque to high-speed low-torque operation.
2. Integrated Parking Brake with Electrical Control Interface
This model is configured with an integrated parking brake module employing a hydraulically released, spring-applied fail-safe design that automatically locks when system pressure is lost, ensuring safe machine parking. The electrical control interface (E option) supports electrical control of displacement switching for easy integration into machine electronic control systems.
3. Modular Architecture for Maximum Adaptability
The MS/MSE08 series employs Poclain’s modular design concept, allowing displacement group, flow-distribution module, brake module and output-end module to be reconfigured for wheel-drive or shaft-drive installation. The 1120 output-end configuration features a 5×Ø18 on Ø140 standard flange, supporting wheel-drive mounting.
4. High-Precision Cam Ring and Long Service Life
The MS08-2 cam ring is manufactured from high-hardness alloy steel with precision grinding to resist high-frequency contact fatigue from piston rollers. A hydrodynamic oil film forms between rollers and cam ring, significantly reducing wear rate and extending overhaul intervals. The modular design allows replacement of individual worn modules rather than the entire motor, substantially reducing total cost of ownership.
5. 100% Simulated Load Testing & Drop-In Interchangeability
Each MS08-2 unit is bench-tested under simulated operating conditions prior to dispatch, covering pressure cycling, speed shifting, brake performance and thermal variation. Mounting flange, shaft end and port dimensions match the original Poclain MS08 series exactly, enabling direct replacement without pipework or interface modification.
Application Areas
The MS08 series is widely deployed in heavy-duty travel and tool drives:
Construction: road rollers, skid steer loaders, excavator travel drives, trenchers
Agriculture: combine harvesters, self-propelled sprayers, cotton pickers
Material Handling: forklifts, aerial work platforms, beam carriers
Mining: subsurface loaders, coal mining machinery travel drives, heavy-duty handling cars
Marine & Offshore: deck machinery, winch drives
Industrial: shredders, industrial conveyors
Expert Maintenance Tips
1. Brake Running-In and Inspection: The integrated parking brake module requires running-in after installation. Run the motor at 50 rpm and perform 10 consecutive brake applications of 30 seconds each, then reverse rotation direction and repeat. After running-in, perform static brake torque verification to confirm release pressure is within the technical manual range. Abnormally high release pressure typically indicates friction plate wear or piston seal failure—replace promptly.
2. Dual Displacement Valving Module Maintenance: The dual displacement valving module is controlled by pilot pressure. If shift response is sluggish or excessively harsh, inspect the pilot control spool for sticking and the flow-distribution shaft O-rings for aging. Shift operations should be performed at low speed or standstill to avoid impact loading on the distribution mechanism.
3. Oil Cleanliness and Temperature Control: Maintain system oil cleanliness at ISO 4406 18/16/13 or better. Operating oil temperature should be kept below 80°C; elevated temperatures accelerate brake friction plate and seal degradation. Replace hydraulic oil and filter after the first 500 hours, then follow a 2,000-hour or annual replacement cycle.
4. Drain Line Management: The drain port must return to the reservoir independently—housing back pressure must not exceed 2 bar. The drain line end must remain submerged to prevent air ingestion. After extended shutdown, fill the housing with clean hydraulic oil before restarting.
5. Periodic Piston Group and Cam Ring Inspection: As a radial piston motor, the MS08-2’s primary wear points are the piston rollers and cam ring contact surface. Inspect piston roller wear and cam ring working surface every 2,000 hours. Both displacement cam surfaces require inspection. Abnormal noise or efficiency loss requires immediate shutdown and service.
