Poclain MS05 MS25 MS35 Hydraulic Motor | Radial Piston Motor

The MS and MSE series (including MS02, MS05, MS25, and MS35 profiles) high-pressure radial piston hydraulic motors manufactured by Chengyuan Hydraulic are premium fluid power components engineered to match the multi-cam internal curve standards of Poclain Hydraulics. Designed specifically for high-torque low-speed (HTLS) traction drives and heavy industrial winch systems, these motors offer unmatched mechanical torque stability. For specific configurations like MS05-2-133-R05-1220-EFJM (splined drive architecture) and MS05-6-133-F05-1230-DJ00 (wheel flange assembly with brake), Chengyuan guarantees 100% original-place interchangeable compatibility. Every motor undergoes 100% full-load simulated condition testing to verify volumetric displacement efficiency and integrated multi-disc braking metrics under severe 450 bar peak operating envelopes.

Technical Specifications :

• Brand Cross-Reference: Poclain Hydraulics MS / MSE Series

• Target Model Covered: MS05 Series (With full matrix support for MS02, MS25, MS35)

• Specific Model Designations: MS05-2-133-R05-1220-EFJM, MS05-6-133-F05-1230-DJ00

• Stator Displacement Base: 133 (133 $cm^3/rev$ active displacement profile)

• Cam Working Wave Type: 2 / 6 (Multi-cam operating layout)

• Continuous Rated Pressure: 400 bar (40 MPa)

• Intermittent Peak System Pressure: 450 bar (45 MPa)

• Max. Peak Torque Output (MS05): Up to 2100 N·m

• Max. Continuous Rotational Speed: 150 rpm – 200 rpm (Subject to single or dual-displacement configuration)

• Drive Interface Setup: R05 (Involute splined shaft interface); F05 (Heavy-duty wheel flange output)

• Integrated Braking Configuration: 1220 / 1230 (Spring-applied, hydraulic-released multi-disc brake)

• Displacement Control Options: Single standard displacement or integrated 2-displacement dynamic valving

Key Technical Advantages:

• Multi-cam Radial Piston Architecture: Power transmission is achieved via multiple pistons reacting directly against a wave-shaped internal cam stator ring. This design yields exceptionally smooth, continuous torque even at speeds down to 1 rpm, effectively resolving the stiction, cogging, and crawling issues typical of orbital motors.

• Hydrodynamically Balanced Piston-Roller Interfaces: The contact surfaces between the hardened alloy steel pistons and rollers are precision honed to tight micro-tolerances. This creates a highly resilient hydrodynamic oil film during full load, minimizing mechanical wear and pushing startup torque efficiency past 90%.

• Reinforced Radial-Axial Bearing Columns: For wheel-drive formats (MS05-6-F05), the integrated bearing housing features oversized tapered roller roller configurations. This matrix accepts massive radial load weight from off-highway vehicles and handles intense axial cross-forces during steering, omitting the need for independent external hub support.

• Fully Enclosed Wet Multi-disc Safety Braking: As specified by codes 1220/1230, the rear section houses a fully enclosed parking and emergency wet multi-disc brake module. Because the friction plates are fully submerged in hydraulic fluid, heat dissipation is instantaneous and the brake remains entirely isolated from external mud, water, or sand, securing maximum holding safety on severe inclines.

Application Areas:

• Heavy-Duty Mobile Construction Equipment: Crawler drill rig rotation drives, wheel excavator travel drives, and skid steer loaders.

• Mining & Underground Engineering: Header drum drives for mining equipment and specialized heavy-duty underground haul trucks.

• Marine & Cargo Handling Systems: Anchor winches, primary cargo hoists, and deep-sea salvage winch drums.

Expert Maintenance Tips:

• Pre-fill and Prime the Case Cavity Prior to Initial Commissioning: The main internal housing of a multi-cam motor must be completely full of hydraulic fluid at all times to lubricate the rollers and cam face. Before starting a newly installed or recently serviced motor, pre-fill the casing completely with clean hydraulic oil through its highest drain port. Running dry will immediately score the cam rings.

• Route Case Drain Lines Independently Back to the Reservoir: Internal case leakage must be directed back to the tank via a dedicated drain line (minimum 12mm inner diameter hose). Connect this line to the highest available drain port on the motor housing, ensuring it terminates below the oil level in the reservoir. Casing backpressure must never exceed 5 bar to protect the front shaft seals.

• Enforce Strict Oil Contamination Boundaries: Radial piston motors feature ultra-precise clearances and are vulnerable to particulate damage. Maintain system cleanliness at ISO 4406 18/16/13 or better. We recommend a 10-micron high-efficiency fiberglass return filter with magnetic capture capability to prevent micro-scratching on the piston walls and preserve volumetric efficiency.