Product Overview
The MSE18-2-12A-R18-1120-5EJ0 is a dual-displacement radial piston hydraulic motor from Poclain Hydraulics’ MS/MSE18 series, featuring a full displacement of 2812 cc/rev and a half displacement of 1406 cc/rev. As an MSE-series (E-version) motor, it delivers a maximum working pressure of 400 bar. The MS/MSE18 series is the large frame offering in Poclain’s multi-purpose motor line, covering displacements from 1091 to 2812 cc/rev with up to 70 kW (94 HP) power, 17,900 N·m (13,202 lb-ft) maximum torque and 450 bar (6,527 psi) maximum pressure, with a multi-speed concept reaching up to 170 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 MS/MSE18 series features 100% interchangeable interfaces with original Poclain motors, with a motor inertia of 0.2 kg·m². The series delivers high starting torque, high mechanical and volumetric efficiency, low noise, low inertia and excellent low-speed performance, with hydrostatic dynamic braking as an inherent design feature.
The model code breaks down as follows: MSE18 identifies the MS/MSE series 18 frame size (E-version, 400 bar maximum working pressure); 2 denotes dual displacement configuration (2812/1406 cc/rev); 12A is the flow-distribution/function module code; R18 is the shaft and mounting configuration code (wheel flange mounting); 1120 is the mounting flange and shaft configuration code; 5EJ0 denotes additional options including electrical control interface and shaft configuration.
Every unit undergoes 100% simulated operating-condition bench testing prior to shipment. Mounting flange, shaft end and port dimensions match the original Poclain MSE18 series exactly, enabling true drop-in interchangeability with zero modification required.
Technical Specifications
MS18/MSE18 Series Frame Size Specifications:
MS18-8: Full displacement 1395 ml/r, half displacement 697 ml/r, max power 62 kW, theoretical torque at 10 MPa 2085 N·m, rated torque 5212 N·m, rated pressure 25 MPa, max pressure 40 MPa, rated speed 55 rpm, speed range 0–150 rpm
MS18-9: Full displacement 1571 ml/r, half displacement 785 ml/r, max power 62 kW, theoretical torque at 10 MPa 2348 N·m, rated torque 5870 N·m, rated pressure 25 MPa, max pressure 40 MPa, rated speed 55 rpm, speed range 0–150 rpm
MS18-0: Full displacement 1747 ml/r, half displacement 873 ml/r, max power 62 kW, theoretical torque at 10 MPa 2611 N·m, rated torque 6528 N·m, rated pressure 25 MPa, max pressure 40 MPa, rated speed 55 rpm, speed range 0–150 rpm
MS18-1: Full displacement 1911 ml/r, half displacement 955 ml/r, max power 62 kW, theoretical torque at 10 MPa 2856 N·m, rated torque 7140 N·m, rated pressure 25 MPa, max pressure 35 MPa, rated speed 55 rpm, speed range 0–135 rpm
MS18-2 (This Model): Full displacement 2099 ml/r, half displacement 1049 ml/r, max power 62 kW, theoretical torque at 10 MPa 3137 N·m, rated torque 7843 N·m, rated pressure 25 MPa, max pressure 35 MPa, rated speed 50 rpm, speed range 0–125 rpm
MS18/MSE18 Series Common Specifications:
Series Max Displacement: 2812 cc/rev (171.6 cu.in/rev)
Series Max Torque: 17,900 N·m (13,202 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: 70 kW (94 HP)
Series Max Speed: 170 rpm
Type: Radial piston LSHT hydraulic motor (internal curve cam ring design)
Control: Single or dual displacement
Brake: Service brake, parking brake and hydrostatic boosted brake options
Motor Type: Wheel motor / shaft motor (modular)
Anti-Skid Option: TwinLock™ available
Motor Inertia: 0.2 kg·m²
Displacement Range: 1091–2812 cc/rev
Original Design: Poclain Hydraulics, France
MSE18-2-12A-R18-1120-5EJ0 Additional Specifications:
Model Code: MSE18-2-12A-R18-1120-5EJ0
Type: Radial piston LSHT hydraulic motor, internal curve cam ring design
Displacement: 2812 cc/rev (171.6 cu.in/rev) full / 1406 cc/rev (85.8 cu.in/rev) half
Displacement Ratio: 2:1
Rated Working Pressure: 25 MPa (250 bar)
Max Working Pressure: 400 bar (MSE version)
Max Torque: 17,900 N·m (13,202 lb-ft)
Max Power: 70 kW (94 HP)
Max Speed: 170 rpm
Valving Type: Dual displacement valving module (12A code)
Mounting Flange: Wheel flange mounting (R18 configuration)
Shaft Configuration: Internal splined shaft, DIN 5480 standard
Anti-Skid Option: TwinLock™ available
Motor Inertia: 0.2 kg·m²
Weight: ~130 kg (depending on configuration)
Operating Temperature Range: -40°C to +115°C
Original Design: Poclain Hydraulics, France
Key Technical Advantages
1. Dual Displacement Design for Wide Operating Range
The MSE18-2-12A features a dual-displacement cam ring design with on-line switching between 2812 cc/rev full displacement and 1406 cc/rev half displacement for a 2:1 ratio. The full-displacement mode delivers up to 17,900 N·m maximum torque for heavy-duty startup and grade climbing; the half-displacement mode significantly increases speed capability for light-load cruising. A single motor covers the full spectrum from low-speed high-torque to high-speed low-torque operation.
2. Internal Curve Radial Piston Design for High Startup Torque and Smooth Low-Speed Operation
The MSE18-2-12A 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. 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 road roller vibration shaft applications. Hydrostatic dynamic braking is an inherent design feature of the motor.
3. Modular Architecture for Maximum Adaptability
The MS/MSE18 series employs Poclain’s modular design concept, allowing displacement group, flow-distribution module, brake module and output-end module to be reconfigured. The wheel flange mounting configuration supports wheel-drive mounting for road rollers, wheeled excavators, scrapers and mining equipment. Optional TwinLock™ integrated anti-skid provides differential locking via hydraulic control for improved traction on challenging terrain.
4. High-Precision Cam Ring and Long Service Life
The MSE18-2-12A 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. The motor features low noise, high radial load capacity and high starting torque.
5. 100% Simulated Load Testing & Drop-In Interchangeability
Each MSE18-2-12A unit is bench-tested under simulated operating conditions prior to dispatch, covering pressure cycling, speed shifting and thermal variation. Mounting flange, shaft end and port dimensions match the original Poclain MSE18 series exactly, enabling direct replacement without pipework or interface modification. Motor performance is very close to original Poclain motors, sometimes even superior to original motors, with both complete motors and spare parts 100% interchangeable.
Application Areas
The MS18/MSE18 series is widely deployed in heavy-duty travel and tool drives:
Road Rollers: vibratory roller vibration shaft drives and travel drives, including Bomag road rollers
Construction: wheeled excavator travel drives, scraper drives, rotary drill head drives, trenchers
Agriculture: combine harvesters, self-propelled sprayers, cotton pickers
Material Handling: heavy-duty 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, mill drives
Expert Maintenance Tips
1. 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. Inspect pilot control pressure and valving module seal condition every 1,000 hours.
2. Wheel Flange Mounting Surface Inspection: The MSE18-2-12A-R18 features wheel flange mounting. 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. Mounting surface flatness requirement is 0.2 mm with Ra 12.5 μm surface roughness.
3. Oil Cleanliness and Temperature Control: Maintain system oil cleanliness at ISO 4406 18/16/13 or better. HV46 hydraulic oil is recommended. 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. Case drain temperature is affected by pressure and speed and is always higher than circuit temperature—system temperature must not exceed 115°C at any point.
4. Drain Line Management and Housing Priming: 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. Fill the housing with clean hydraulic oil before first startup. After extended shutdown, fill the housing again before restarting.
5. Periodic Piston Group and Cam Ring Inspection: As a radial piston motor, the MSE18-2-12A’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. Use Poclain original specification parts when replacing piston groups to ensure fit accuracy and assembly torque per technical manual requirements.
6. Modular Repair Strategy: The MS/MSE18 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.
