BMSY 400 Hydraulic Motor | BMSY-400-E4-G-S | BMSY-400-E2-KS | LSHT Orbit Motor

The BMSY 400 Series from LIC Hydraulic is a premier Low-Speed High-Torque (LSHT) orbit motor utilizing advanced Geroler and Disc Valve technology. Models like the BMSY-400-E4-G-S and BMSY400E2KS are engineered for high-performance applications where smooth rotation and consistent torque are critical. With its robust internal design, the BMSY 400 offers a superior alternative to international standards such as the Danfoss OMS and Eaton 2000 series. We provide 100% drop-in replacements, ensuring that displacement, mounting patterns, and shaft configurations align perfectly with your existing hydraulic systems.

Technical Specifications

• Displacement: $400\text{ cm}^3\text{/rev}$ ($24.4\text{ in}^3\text{/rev}$)

• Max Pressure: Continuous $160\text{–}200\text{ bar}$ (up to $2900\text{ psi}$)

• Max Torque: Up to $900\text{–}1000\text{ Nm}$

• Max Speed: $150\text{–}190\text{ rpm}$

• Shaft Options: $32\text{ mm}$ Parallel Keyed, Splined, or Tapered.

• Mounting: 2-bolt SAE A or 4-bolt Square Flange.

Core Advantages

• Optimized Geroler Set: The roller-contact geometry provides higher mechanical efficiency and a longer service life by minimizing internal friction during high-pressure cycles.

• Disc Valve Compensation: The balanced valve plate automatically adjusts for thermal expansion and wear, maintaining peak volumetric performance even in harsh operating temperatures.

• High Radial Load Capacity: Integrated heavy-duty tapered roller bearings allow for high external forces on the shaft, ideal for direct-drive pulleys or heavy winch drums.

• Universal Interchangeability: Designed as a precise fit for global OEM machinery, reducing inventory costs and maintenance downtime.

Expert Maintenance Tips

• Initial Priming: Always fill the motor housing with filtered hydraulic oil through the ports before the first startup to ensure the internal Geroler set is lubricated.

• Drain Line Recommendation: For applications involving high back-pressure or frequent reversals, connecting the external case drain line is highly recommended to maximize shaft seal longevity.

• Fluid Cleanliness: To protect the precision-ground surfaces, maintain oil at ISO 19/16 cleanliness or better. Contaminants are the primary cause of scoring on the valve plate and Geroler set.