Product Overview
The MS08-0-121-M08-1120-E000 is a single-displacement radial piston hydraulic motor from Poclain Hydraulics’ MS/MSE08 series, featuring a displacement of 780 ml/r. 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; 0 denotes the displacement group (780 ml/r full displacement); 121 is the flow-distribution/function module (1=valving type, 2=lug fixing, 1=standard configuration); M08 is the mounting flange and shaft code; 1120 is the output-end configuration (1=without mounting bearing support, 1=5×Ø18 on Ø140 flange, 2=with studs and nuts); E000 denotes additional options.
The MS08 series employs an internal curve radial piston design with a flange-plane output, enabling direct connection to wheel or tool ends. The MS08 series is OEM-installed on Caterpillar, Volvo CE, JCB, Case, New Holland, Bobcat, John Deere, Takeuchi, Claas, Fendt, Amazone, Agrifac and Hardi machinery platforms.
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 (This Model): 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 857/428 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: 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 6,680–7,945 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 (internal curve cam ring design)
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
MS08-0-121-M08-1120-E000 Additional Specifications:
Model Code: MS08-0-121-M08-1120-E000
Poclain Part Number: 003843738B
Type: Compact radial piston motor, internal curve design
Displacement: 780 ml/r (full displacement)
Theoretical Torque at 10 MPa: 1,166 N·m
Rated Torque: 2,914 N·m
Rated Pressure: 25 MPa (250 bar)
Max Pressure: 40 MPa (400 bar)
Rated Speed: 70 rpm
Speed Range: 0–170 rpm
Valving Type: Single displacement valving module (121 code)
Mounting Flange: Standard wheel flange configuration
Output-End Configuration: 5×Ø18 on Ø140 flange, with studs and nuts
Weight: ~70 kg (154 lbs)
Max Power: 36 kW (1C single displacement configuration)
Key Technical Advantages
1. Internal Curve Radial Piston Design for High Startup Torque and Smooth Low-Speed Operation
The MS08-0 employs Poclain’s patented internal curve radial piston design, with multiple pistons distributed along the cam ring’s internal curve to deliver high torque at extremely low speeds. With a rated torque of 2,914 N·m, the motor operates smoothly across the entire 0–170 rpm speed range without stick-slip. High startup torque ensures reliable starting under load, making it ideal for wheel-drive and tool-drive applications requiring high startup torque.
2. High Pressure Capability — 400 Bar Maximum Working Pressure
The MS08-0 supports 25 MPa rated working pressure and 40 MPa maximum working pressure (up to 450 bar for MS version), delivering excellent power density in medium-power hydrostatic transmission applications. This pressure rating offers significant advantages in travel drive and tool drive applications requiring high torque density.
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 for wheel loaders, dump trucks, road rollers and more.
4. High-Precision Cam Ring and Long Service Life
The MS08-0 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 MS08-0 unit is bench-tested under simulated operating conditions prior to dispatch, covering pressure cycling, speed stepping 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: wheel loaders (New Holland W70C, etc.), road rollers, compact excavator travel drives, beam carriers
Agriculture: combine harvesters, self-propelled sprayers, mowers
Material Handling: heavy-duty forklifts, beam carriers, aerial work platforms
Mining: subsurface loaders, coal mining machinery travel drives, heavy-duty handling cars
Marine & Offshore: deck machinery, winch drives
Industrial: shredders, industrial conveyors, mill drives
Expert Maintenance Tips
1. 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 seal degradation. Replace hydraulic oil and filter after the first 500 hours, then follow a 2,000-hour or annual replacement cycle.
2. 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.
3. Wheel Flange Mounting Surface Inspection: The MS08-0-121 features wheel flange mounting (5×Ø18 on Ø140). Periodically inspect the output flange plane and wheel hub mating surface for wear or deformation. Ensure flange mating surface parallelism deviation does not exceed 0.05 mm during installation, and tighten bolts evenly in a diagonal sequence to Poclain technical manual torque values.
4. Periodic Piston Group and Cam Ring Inspection: As a radial piston motor, the MS08-0’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. Abnormal noise or efficiency loss requires immediate shutdown and service.
5. Modular Repair Strategy: The MS/MSE08 series modular design allows replacement of individual worn modules rather than the entire motor. Establish a modular spare parts inventory including flow-distribution module seals, piston groups and cam rings to minimize machine downtime. When replacing modules, follow Poclain official technical manual torque values and assembly sequences.
