BM5U Orbit Motor | BM1 BM2 BM3 BM5 BMH BMT | High Torque Hydraulic Motor

The BM Series Orbit Motors from LIC Hydraulic are designed for applications requiring high torque at low to medium speeds. Covering the entire spectrum from the micro BMM to the powerhouse BM5 (BMT) series, these motors utilize the Geroler principle for maximum mechanical efficiency. The BM5U-985PA1Y1 is a high-displacement flagship unit, capable of handling massive radial loads and frequent Positive/Negative (Bi-directional) rotation cycles. We provide 100% drop-in replacements for global brands like Danfoss, Eaton (Char-Lynn), and Parker, matching all flange, shaft, and port specifications.

Technical Highlights

• Series Hierarchy: BMM (Micro), BMP/BMR (Light), BMS/BMH (Medium), BMT/BM5 (Heavy).

• Max Pressure: Continuous up to $200\text{–}250\text{ bar}$ ($2900\text{–}3625\text{ psi}$).

• Torque Range: From $10\text{ Nm}$ up to $2500+\text{ Nm}$.

• Rotation: Bi-directional with symmetrical efficiency.

Core Advantages

• High Start-up Torque: The Geroler design minimizes “stiction,” allowing the motor to start smoothly under full load without the stuttering common in lower-quality alternatives.

• Rugged Bearing Construction: Equipped with heavy-duty tapered roller bearings, the BM5U can support direct drive wheels or heavy sprocket loads, eliminating the need for external outboard bearings.

• Precision Disc Valve Technology: In the BMT and BM5 series, the disc valve distribution reduces internal leakage and provides high volumetric efficiency even as hydraulic temperatures rise.

• Versatile Customization: Available in a wide array of mounting options (4-bolt, 2-bolt, wheel-mount), shaft types (splined, keyed, tapered), and port sizes to fit any machine architecture.

Expert Maintenance Tips

• Check Rotation Arrow: While most BM motors are bi-directional, ensure your plumbing matches the desired rotation. Reversed flow without checking the relief valve settings can cause unexpected pressure spikes.

• Case Drain Management: For heavy-duty motors like the BM5U, always connect the case drain line if the system back-pressure exceeds the seal rating (typically $20\text{–}50\text{ bar}$). This prevents premature shaft seal failure.

• Fluid Cleanliness: To maintain the precision tolerances of the Geroler set, maintain oil cleanliness at ISO 19/17/14. Particulate contamination is the primary cause of internal “scoring” and loss of low-speed torque.