158-3990-001 BMER High Pressure LSHT Orbital Motor 296cc

Product Overview
The 158-3990-001 (and related BMER series models including 158/106/109/110/111/112/113/119/104/114 etc.) is a high-pressure low-speed high-torque (LSHT) orbital hydraulic motor featuring an advanced Geroler gear set and high-speed distribution structure. Designed for high working pressure, high volumetric efficiency and smooth low-speed operation, every unit undergoes 100% simulated operating-condition testing to guarantee exact interchangeability with Eaton Char-Lynn, White RE/530 series, Parker TF/TG, Danfoss OMR and equivalent motors. Standard high-pressure shaft seal eliminates the need for a case drain, making it ideal for medium-to-heavy duty mobile and industrial hydraulic drive systems.

Technical Specifications (Bulleted List)

• Model: 158-3990-001 / BMER series (covers common displacements 125–750 cc, including 6K/2K configurations)
• Geometric displacement range: 118–745 cm³/rev (typical 296 cm³/rev ≈ 18.06 in³/rev)
• Continuous differential pressure: 20.5 MPa (205 bar / 2973 psi for smaller sizes)
• Intermittent differential pressure: 24 MPa (240 bar / 3481 psi)
• Peak pressure: 27.6 MPa
• Maximum continuous speed: displacement-dependent, typically 250–375 rpm (higher for smaller sizes)
• Maximum continuous flow: 45–80 L/min (displacement-dependent)
• Continuous torque: 325–1085 Nm (displacement-dependent; approx. 810 Nm for 300 cc class)
• Intermittent torque: 380–1240 Nm
• Maximum output power: continuous approx. 12–18 kW
• Control: Standard bidirectional rotation (reverse-timed options available)
• Mounting: Magneto 6-bolt or Wheel 4-bolt etc.
• Shaft options: common 1-1/4″ keyed, tapered, splined
• Weight: approx. 10.6–15 kg depending on displacement and mount
• Feature: Standard high-pressure shaft seal, no case drain required

Key Technical Advantages

1. Advanced Geroler gear set with high-speed distribution: Delivers high volumetric efficiency with automatic wear compensation, ensuring smooth shock-free low-speed operation and starting torque close to theoretical values.
2. High-pressure shaft seal and case-drain-free design: Shaft seals rated up to 200 bar system pressure; optimized internal flow eliminates the need for a separate case drain, simplifying plumbing and extending seal life.
3. High side-load capacity and precision manufacturing: Needle-roller bearing structure supports elevated radial loads; high-accuracy machining of critical surfaces ensures long service life and low noise.
4. Wide displacement range and true interchangeability: Covers 118–745 cm³/rev with exact matching of mounting dimensions and performance curves to Eaton, White, Parker and other major brands for direct drop-in replacement.

Application Areas
Agricultural machinery (augers, conveyors, harvester drives), construction equipment (trenchers, sweepers, skid-steer attachments), forestry machines, material-handling and chain drives, winches and boom-rotate systems, vehicle propulsion, and fixed industrial hydraulic installations requiring high-pressure low-speed high-torque output.

Expert Maintenance Tips
Verify exact flange and shaft configuration match the original machine (Magneto or Wheel etc.) before installation. Use clean hydraulic fluid with adequate filtration (β10 ≥ 75 recommended). Fully bleed the system prior to first operation to avoid dry running. Periodically inspect shaft and port seals. Maintain oil temperature within recommended range and limit intermittent high-pressure operation to no more than 10% of total running time. For long-term storage, protect against corrosion and seal all ports.