Poclain MSE Series Piston Motor MSE02 MSE11 MSE18

The industrial and mobile-grade MSE Series Multi-Cam Inner-Curve Radial Piston Hydraulic Motors (highlighting highly specified B2B reference models including MSE11-2-G54-R11-1920-25EJM, MSE18-2-121-T19-1840-5DJP, and the compact MSE02-2-123-R02-1240-J0), engineered by Chengyuan Hydraulic, are heavy-duty Low-Speed High-Torque (LSHT) direct-drive actuators. Designed specifically for hydrostatic wheel drives, crawler undercarriages, road construction compaction rollers, heavy agricultural harvesters, and drilling rig power heads, these motors utilize a multi-stroke radial piston configuration to deliver incredible mechanical efficiency, robust starting torque, and stable crawling performance down to $0.5 \text{ rpm}$.

Engineered strictly to global dimensional and mechanical parameters, Chengyuan’s MSE motors feature 100% direct drop-in interchangeability with premium international standards (such as Poclain Hydraulics’ MSE02, MSE11, and MSE18 generation series). From the wheel mounting flange bolt patterns (PCD), drive shafts, torque arms, to main high-pressure port positions and brake release lines, these units fit seamlessly into existing machine designs. Equipment builders and fleet maintenance operators can execute direct replacements on heavy machinery without structural modification, eliminating engineering bottlenecks and downtime.

Operating as primary traction drives in rugged environments, wheel motors are continuously exposed to severe external shock loads, sudden pressure spikes, rapid direction reversals, and abrasive ambient dust. Any structural degradation of the roller-piston interface or cam ring profiling will lead to immediate loss of vehicle tractive effort. To guarantee field reliability, 100% of Chengyuan’s MSE radial piston motors undergo 100% strict dynamic full-load dynamometer test bench protocols. Each motor is monitored under full operating pressures (40 MPa) and peak transient spikes (45 MPa) to verify volumetric efficiency, breaking torque retention, dual-displacement shifting response, and structural sealing integrity before delivery.

Technical Specifications

• Product Classification: Inner-Curve Multi-Stroke Radial Piston Low-Speed High-Torque (LSHT) Motor

• Design Generation Profile: MSE Series (Generation 2 Architecture)

• Frame Size & Core Displacement Identifiers:

  • Size MSE02 (e.g., MSE02-…-1240): Core displacement code 1240 designates $240 \text{ cm}^3/\text{rev}$, with peak rotational boundaries up to $350 \text{ rpm}$.

  • Size MSE11 (e.g., MSE11-…-1920): Core displacement code 1920 designates $920 \text{ cm}^3/\text{rev}$, with peak rotational boundaries up to $190 \text{ rpm}$.

  • Size MSE18 (e.g., MSE18-…-1840): Core displacement code 1840 designates $1840 \text{ cm}^3/\text{rev}$, with peak rotational boundaries up to $130 \text{ rpm}$.

• System Pressure Ratings:

  • Nominal Continuous Operating Pressure: $40.0 \text{ MPa}$ (400 bar / 5800 psi)

  • Maximum Peak Transient Pressure: $45.0 \text{ MPa}$ (450 bar / 6525 psi)

• Model Configuration Code Breakdown:

  • Part Reference: MSE11-2-G54-R11-1920-25EJM

    • MSE11: Denotes frame size 11 architecture.

    • 1920: Indicates a displacement of $920 \text{ ml/rev}$.

    • G54/R11/25EJM: Specifies the integrated wheel flange geometry, high-pressure porting lines, and built-in valve/dual-displacement control configurations.

  • Part Reference: MSE18-2-121-T19-1840-5DJP

    • MSE18: Denotes ultra-high torque frame size 18 chassis.

    • 1840: Calibrated to $1840 \text{ ml/rev}$ displacement.

    • 121-T19: Equipped with a heavy-duty reinforced direct-mounting wheel flange hub.

  • Part Reference: MSE02-2-123-R02-1240-J0

    • MSE02: Compact size 02 motor casing.

    • 1240: Configured with a $240 \text{ ml/rev}$ geometric displacement envelope.

• Torque Output Boundaries: Ranging from $1,500 \text{ N}\cdot\text{m}$ up to $18,000 \text{ N}\cdot\text{m}$ (highly dependent on frame sizing and effective system differential pressure scales).

• Integrated Brake Option: Available with a built-in multi-disc wet parking brake, with holding torque calibrated to match or exceed the motor’s peak mechanical torque output.

Key Technical Advantages

• Precision-Profiled Multi-Cam Ring Matrix: The wave-formed inner-curve cam ring is machined from high-purity bearing steel using multi-axis CNC grinding systems, followed by deep carbonitriding and super-polishing. Because the piston rollers act radially and orthogonally against the cam track, there is no axial sliding component or slipper-pad friction, delivering high starting torque efficiency and smooth low-speed performance.

• Reinforced Wheel Hub Bearings Assembly: Engineered for direct wheel and chassis integration, the front housing incorporates heavy-duty, pre-loaded tapered roller bearings. This assembly absorbs immense vertical radial loads and severe lateral axial forces during vehicle turning maneuvers, allowing the motor to function as both the structural wheel hub and traction drive without secondary planetary gearboxes.

• Flat Distributor Plane Sealing Technology: The fluid distribution system utilizes a flat, hydraulically balanced valve design that is highly resistant to fluid thermal shocking and particulate contamination. The wide fluid channels minimize localized pressure drop, resulting in a volumetric efficiency of up to 96% while allowing smooth, high-frequency bidirectional directional reversals.

• Fail-Safe Spring-Applied Hydraulic-Released (SAHR) Brake: The integrated parking brake system features multi-disc friction plates submerged in the housing oil for optimal cooling. Operating via fail-safe SAHR logic, the brake automatically locks the drive shaft if system pilot pressure is lost, ensuring positive hold on steep slopes or heavy winching platforms.

Application Areas

MSE series radial piston motors serve as heavy-duty direct-drive wheel or track actuators across critical infrastructure sectors:

• Road Construction & Compaction Machinery: Main vibratory steel-drum and rear pneumatic wheel drives for asphalt rollers, pavers, and cold milling machines.

• Heavy Agricultural & Forestry Equipment: Direct 4WD propulsion systems for combine harvesters, high-clearance crop sprayers, and forestry forwarders.

• Trenchless Drilling & Civil Engineering Gear: High-torque track drives for directional drill rigs, horizontal augers, and compact piling machinery.

Expert Maintenance Tips

• The Motor Casing Must Be Fully Pre-Filled with Clean Hydraulic Oil Via the Highest Case Drain Port Prior to Commissioning: Because of the wide internal envelope of radial piston motors, running the unit dry will leave the top piston rollers and cam tracks without an initial lubricating film. This can cause immediate metal-to-metal galling or micro-pitting upon start-up.

• The Continuous Internal Case Drain Pressure Must Never Exceed $0.1 \text{ MPa}$ ($1 \text{ bar}$), with Transient Peaks Under $0.5 \text{ MPa}$: The case drain line must be plumbed independently and unrestricted directly back to the reservoir. It should never be combined with main return lines or valve drain lines. Excessive case backpressure can compromise the heavy-duty dual-lip shaft seal and restrict piston return strokes, leading to severe roller-to-cam impacting.

• Maintain Hydraulic Fluid Cleanliness at ISO 4406 19/16/13 or Better and Perform Periodic Oil Sampling: Mobile machinery operates in highly abrasive, wet, and dusty environments. If moisture or fine particulates breach worn external seals and enter the motor casing, they will accelerate sub-surface fatigue flaking on the cam ring. Sample the casing oil every 1,000 hours to ensure the fluid’s lubricating properties are maintained.