BM2-400 Cycloid Orbit Motor High Torque LSHT

Product Overview

The BM2-400 (and BM2-50/63/80/100/125/160/200/250 series) is a cycloid (Gerotor) low-speed high-torque orbital hydraulic motor designed for high interchangeability with Danfoss OMR / OMS and similar mainstream series. Featuring precision stator-rotor geometry and spool-valve distribution, these motors deliver high starting torque, smooth low-speed operation and compact installation for medium-duty applications. Emphasis is placed on volumetric efficiency, high-pressure shaft seals and long service life. Every unit undergoes 100% simulated condition testing to ensure reliable performance in agricultural, construction and industrial hydraulic systems. The BM2 series targets economical medium-duty use across a wide displacement range.

Technical Specifications 

• Model: BM2-400 (BM2 Series)
• Geometric Displacement: 400 cm³/rev
• Continuous Maximum Pressure Drop: 9–14 MPa (configuration-dependent)
• Intermittent Maximum Pressure Drop: 10–17.5 MPa
• Continuous Maximum Torque: approx. 418–720 Nm
• Intermittent Maximum Torque: approx. 464–905 Nm
• Continuous Maximum Speed: approx. 120–140 rpm
• Intermittent Maximum Speed: approx. 162 rpm
• Continuous Maximum Flow: approx. 50–58 L/min
• Control Type: Spool-valve cycloid orbital motor
• Bearings & Seals: High-capacity bearings with high-pressure shaft seal
• Approximate Weight: 10–15 kg (configuration-dependent)

Key Technical Advantages

1. Advanced stator parameter design provides low starting pressure, high efficiency, good retention and smooth, low-noise operation.
2. High-pressure shaft seal design tolerates elevated return pressure, enabling series or parallel operation and simplifying system plumbing.
3. Special linkage structure and precision machining extend spline and bearing life under medium-duty continuous service.
4. Compact envelope with multiple flange, shaft and port options supports full drop-in interchangeability with Danfoss OMR / OMS and equivalent motors.
5. 100% simulated operating condition testing validates performance consistency under real pressure, flow and load conditions.

Application Areas

Agricultural machinery (conveyors, drives), construction vehicles, material handling equipment, winches and hoists, augers, light construction machinery, and other mobile or stationary hydraulic systems requiring high torque at low to medium speeds.

Expert Maintenance Tips

Ensure precise flange alignment and control side loads during installation. Use anti-wear hydraulic oil with operating viscosity of 20–43 cSt and keep oil temperature below 80°C. Run at reduced load for initial break-in (recommended 1 hour at 40% of continuous pressure). Regularly inspect the shaft seal and fluid cleanliness. Limit intermittent operation to no more than 10% of each minute. Recommended return pressure ≤ 5 MPa; install a case drain if higher. In case of abnormal noise or performance loss, first check system contamination and fluid condition.