Product Overview
The MSE18-2-G17-E12-2410-2500 is the flagship radial piston hydraulic motor from the Poclain Hydraulics MS/MSE18 Series, representing over half a century of Poclain’s technical expertise in low-speed high-torque direct drive technology. The MS18/MSE18 Series represents the highest power class within the Poclain MS Classic platform, achieving a maximum displacement of 2,812 cc/rev, maximum power of 70 kW (94 HP), maximum torque of 17,900 Nm, and maximum pressure up to 450 bar, with high speeds reached at 170 rpm through a multispeed concept. The series is specifically developed for compactor wheel drive, while also being extensively deployed in wheel drive or tool drive systems across construction equipment, material handling, agricultural machinery, environmental equipment, mining, rail, marine, and industrial applications.
The MSE18-2-G17-E12-2410-2500 belongs to the “2” displacement group within the MSE18 frame size, with a full displacement of 2,812 cc/rev and a semi-displacement of 1,406 cc/rev in a dual displacement configuration. Model code breakdown: MSE18 designates the 18 frame size dual displacement motor in the MS Series (MSE version working pressure 400 bar; MS version 450 bar); 2 indicates the displacement group (full displacement 2,812 cc/rev); G17 specifies the mounting flange and shaft configuration; E12 defines port location and connection specification; 2410 specifies the control and valve body configuration; and 2500 indicates the special option code.
The motor is manufactured to original Poclain Hydraulics specifications with 100% drop-in interchangeability, requiring no modification to mounting interfaces, port positions, or hydraulic connections. Every unit undergoes 100% simulated operating condition testing at the factory, including rated pressure loading, volumetric efficiency verification, seal integrity assessment, and low-speed smoothness validation prior to shipment.
Technical Specifications
MSE18-2-G17-E12-2410-2500:
Series / Type: Poclain MS/MSE18 Series radial piston hydraulic motor, dual displacement
Displacement group: Displacement Group 2
Full displacement: 2,812 cc/rev (171.5 cu.in/rev)
Semi-displacement: 1,406 cc/rev (85.8 cu.in/rev)
Design: Radial piston cam-lobe design, working cylinders radially arranged around crankshaft
Working pressure (MSE version): 400 bar (5,802 psi / 40 MPa)
Maximum pressure (continuous): 400 bar
Peak pressure: 450 bar (MS version)
Maximum torque: 17,900 Nm (13,202 lb-ft)
Theoretical torque at 100 bar: 4,471 Nm (3,297 lb-ft)
Maximum power: 70 kW (94 HP)
Rated speed (full/semi displacement): 75/90 rpm
Maximum speed: 170 rpm (multispeed concept)
Direction of rotation: Bidirectional
Mounting: Wheel flange mount
Output shaft: DIN 5480 standard spline
Brake: Service brake, parking brake, hydrostatic boosted brake options available
Anti-skid: TwinLock™ integrated anti-skid system compatible
Bearing arrangement: Compact reinforced bearing support, withstands accelerations of 20G
Housing material: High-strength cast iron
Approximate weight: 96 kg (varies with configuration options)
MS18/MSE18 Series displacement range (for reference):
MS18-6: 1,091 cc/rev (semi 546 cc/rev)
MS18-8: 1,395 cc/rev (semi 698 cc/rev)
MS18-9: 1,571 cc/rev (semi 786 cc/rev)
MS18-0: 1,747 cc/rev (semi 974 cc/rev)
MS18-1: 1,911 cc/rev (semi 956 cc/rev)
MS18-2: 2,099 cc/rev (semi 1,050 cc/rev)
MSE18-0: 2,340 cc/rev (semi 1,170 cc/rev)
MSE18-1: 2,560 cc/rev (semi 1,280 cc/rev)
MSE18-2: 2,812 cc/rev (semi 1,406 cc/rev)
Note: The MS version operates at 450 bar working pressure; the MSE version at 400 bar. Displacement, pressure, torque, and speed data above are sourced from Poclain Hydraulics official product technical specifications and technical manuals. For precise technical specifications of the MSE18-2-G17-E12-2410-2500, always consult the official Poclain Hydraulics technical manual or the product nameplate data.
Key Technical Advantages
1. Radial Piston Cam-Lobe Principle for High Starting Torque
The MSE18-2-G17-E12-2410-2500 employs Poclain’s signature radial piston cam-lobe architecture, with working cylinders arranged radially around the crankshaft and pistons converting radial force into crankshaft rotational torque through the cam ring. Piston force is applied directly to the crankshaft eccentricity, maximizing the moment arm and enabling extremely high starting torque even at very low speeds. Notably, the MS18/MSE18 was developed specifically for compaction, and its starting performance is 15% greater than a high-speed motor and gearbox combination, with 12% higher overall efficiency. This makes it easier for operators to start on hills and maneuver around obstacles. The motor reliably withstands accelerations of 20G, making it ideally suited for installation on vibratory rollers and other equipment subject to severe vibration and shock loading.
2. Dual Displacement Switching and Multi-Speed Drive Capability
The MSE18-2-G17-E12-2410-2500 features a dual displacement configuration, capable of switching between full displacement (2,812 cc/rev) and semi displacement (1,406 cc/rev). At full displacement, the motor delivers maximum torque for heavy-load starting and grade climbing. After switching to semi displacement, output speed increases approximately twofold at the same input flow, suitable for rapid travel and transfer operations. The multispeed concept enables motor speeds up to 170 rpm, allowing a single motor to cover both low-speed high-torque and high-speed light-load operating requirements without additional gearboxes or reduction mechanisms, simplifying drivetrain design.
3. Direct Drive Design Optimized for Compaction Equipment
The MS18/MSE18 was developed specifically by Poclain for compaction equipment, employing a direct drive design that eliminates the intermediate transmission stages of high-speed motors with gearboxes. The engineering value of direct drive includes: elimination of gear transmission backlash and energy losses, improving transmission efficiency; reduced system complexity with fewer maintenance points; and greater machine architecture flexibility for manufacturers — silentbloc shock absorbers can be placed either between the drum and the motor, or between the motor and the chassis, whereas high-speed motor solutions require complete isolation from the drum.
4. Modular Design for System Integration Flexibility
The MS/MSE18 Series features a highly modular design with flexible configuration options for wheel flanges, shaft ends (DIN 5480 spline), brake types (service brake, parking brake, hydrostatic boosted brake), and the TwinLock™ integrated anti-skid system. The engineering value of the modular architecture lies in its ability to achieve different functional configurations by replacing end cap modules rather than the entire motor. The TwinLock™ anti-skid system transfers torque from slipping wheels to wheels with greater grip on low-traction surfaces, significantly enhancing machine crossing capability and safety. The MSE18’s parking brake torque of up to 19,000 Nm covers a wide range of 8 to 14 tonne (8.8 to 15 US tons) compactors, enabling seamless machine integration.
5. Compact Structure and High Power Density
The MS/MSE18 Series achieves 2,812 cc/rev displacement capability and maximum power of 70 kW within a compact housing, delivering a power density that leads its class among low-speed high-torque radial piston motors. The motor can be installed directly within the compactor drum or wheel hub (wheel drive applications), with output shaft bearings accommodating simultaneous radial and axial external loads, eliminating the need for separate bearing support housings and simplifying system design while reducing installation costs.
Application Areas
Road construction and maintenance: Vibratory roller wheel drives (Bomag, Hamm, SDLG and comparable brands), the series is specifically developed for compaction equipment
Construction equipment: Skid steer loaders, mini loaders, road milling machine auxiliary drives
Material handling: Heavy-duty forklift travel drives, aerial work platform travel systems
Agricultural machinery: Tractor wheel drives, combine harvester ground drives, self-propelled sprayers
Mining equipment: Underground mining LHDs (load-haul-dump), underground transport vehicle drives
Environmental equipment: Sanitation vehicle travel drives, street sweeper drives
Rail and marine: Suspended locomotives, ship deck auxiliary drives
Tool drives: Drill, milling, and cutting tool rotary drives
Expert Maintenance Tips
1. Fluid Cleanliness Management Is the Primary Task
The MSE18 Series operates with micron-level clearances between radial pistons and the cam ring, and between pistons and cylinder bores. Particulate contamination in hydraulic fluid is the leading cause of piston scoring and cam ring wear. Systems must be equipped with filtration rated to ISO 4406 18/16/13 or better. In high-contamination environments such as compactor or construction job sites, consider increasing filtration to ISO 4406 17/15/12 and shortening filter replacement intervals to 500–800 hours.
2. Case Drain Line Configuration Requirements
Case drain from the MSE18 motor must be routed to the reservoir through the highest drain port, with case pressure strictly controlled within specified limits. Excessive case pressure will cause shaft seal failure; insufficient pressure will reduce lubrication and heat rejection effectiveness. The case drain line must terminate below the minimum oil level in the reservoir to maintain positive return flow under all operating conditions. For models equipped with a brake, the brake leakage oil circuit should drain independently and must not share the motor case drain line.
3. Dual Displacement Switching Mechanism Maintenance
For the dual displacement MSE18-2 configuration, periodically inspect the displacement switching valve response characteristics and seal condition. The switching valve actuation pressure must be set to the value specified in the Poclain technical manual. If displacement switching lag or failure to actuate is observed, it may indicate switching spool sticking or control oil circuit blockage, warranting timely inspection. All switching mechanism seals should be replaced during any teardown procedure.
4. Pre-Start Case Filling and Air Purging
Before first startup after installation or repair, the motor case must be filled with clean hydraulic fluid through the highest case port until fluid overflows. The MSE18 radial piston architecture creates a complex internal case cavity geometry; starting an un-purged motor can cause dry friction damage between piston ball ends and the cam ring, leading to irreversible premature wear.
5. Special Considerations for Wheel Drive Installation
The MSE18 Series is specifically designed for wheel drive applications. During installation, verify that the DIN 5480 spline output shaft is properly aligned with the wheel hub, and that spline engagement length meets design requirements. Installation misalignment will cause abnormal spline wear and bearing side loading, significantly shortening service life. For compactor drum drive applications, pay particular attention to the concentricity between the drum hub and motor flange. Tighten mounting bolts in stages to the specified torque value and re-check torque after 500 operating hours.
6. Low-Speed Smoothness Monitoring and Maintenance
One of the MS/MSE18 Series’ core advantages is smooth low-speed operation. If crawling or vibration is observed at extremely low speeds, it may indicate increased piston-to-bore clearance, cam ring wear, or flow distribution surface sealing degradation. Record the minimum smooth operating speed under standard conditions quarterly as a trend monitoring baseline; deviation exceeding 15% from the initial value warrants inspection.
