Danfoss OMR 50 Hydraulic Motor 151-0410

Danfoss OMR-50 Hydraulic Motor (MPN: 151-0410)

The Danfoss OMR-50 (Part Number: 151-0410) is a low-speed high-torque (LSHT) orbital hydraulic motor operating on the precision-engineered Geroler® principle. Designed for continuous medium-to-heavy duty operation across offshore, commercial marine, mobile construction, and industrial manufacturing machinery, the unit delivers consistent volumetric efficiency and low-speed torque.

Featuring a 51.6 cm³/rev (3.15 in³/rev) geometric displacement, this model is built on Danfoss’s robust Series 6 platform, equipped with a cylindrical 25 mm parallel keyed shaft, standard SAE-A 2-bolt mounting flange, and G 1/2 (BSPP) threaded work ports. The motor is configured with an integrated high-pressure HNBR shaft seal and internal bypass check valves, eliminating the necessity of an external case drain line under standard permissible return line pressures.

Model Details:

• Manufacturer: Danfoss Power Solutions (formerly Sauer-Danfoss / White Drive)
• Series: OMR Series (Geroler Mechanism)
• Model Code: OMR 50
• Manufacturer Part Number (MPN): 151-0410
• Superseded / Migration Part Number: 11185537
• Seal Kit Part Number: 151-1286 (NBR/HNBR High-Pressure Seal Kit)

Key Features

1. High-Efficiency Geroler® Gear Set: Precision roll-contact teeth minimize internal friction, enhance mechanical efficiency during cold start-ups, and ensure smooth rotation even at ultra-low speeds (<15 rpm).
2. Integrated High-Pressure HNBR Shaft Seal: Accommodates high backpressures directly in the return line without premature seal extrusion, safely bypassing low-to-medium pressure spikes back to tank without requiring an auxiliary drain port.
3. Standardized SAE-A 2-Bolt Interface: Symmetrical 82.5 mm pilot with 106.4 mm bolt spacing ensures fast, drop-in replacement across global OEM machinery footprints.
4. High Radial and Axial Shaft Load Capacity: Supported by precision journal bearings optimized for chain, belt, gear, or direct-drive shaft coupling setups.
5. Corrosion-Resistant Cast Body: Engineered for harsh marine deck duty, industrial chemical washdown stations, and exposed off-highway vehicle undercarriages.

Compatibility

• Mooring & Anchor Winch Spooling Drives: Auxiliary line capstans, net hauling winches, drum rotation gearboxes.
• Deck Handling Cranes: Slew gear drives, boom hoist auxiliary drives, cable reelers.
• Hatch Cover Actuation: Chain and pinion drive mechanisms on dry cargo vessels.
• Thruster Pod Auxiliary Steering: Small craft emergency hydraulic positioning drives.

Frequently Asked Questions

Can the Danfoss OMR-50 151-0410 motor rotate in both directions?

Yes. The motor is bi-directional. Reversing fluid flow between ports A and B reverses the shaft rotation direction. Differential pressure and torque ratings remain identical in clockwise and counterclockwise operations.

What is the primary difference between Danfoss OMP and OMR series motors?

While both are orbital motors, the OMP series utilizes fixed rollers (Gerotor mechanism), whereas the OMR series incorporates hydrodynamic roller elements (Geroler mechanism) in the outer gear ring. The Geroler design significantly reduces friction, increases operating efficiency, provides smoother low-speed torque under load, and extends service life under continuous industrial duties.

How do I maintain the shaft seal if backpressure rises?

Since the 151-0410 does not feature an external drain connection, high return backpressures directly load the shaft seal. If line backpressure cannot be lowered at the valve block or manifold, you must either install an external relief check valve line or upgrade to an OMR variant equipped with a dedicated case drain port (such as 151-0710).

What replacement seal kit does the 151-0410 use?

The standard seal overhaul kit for this model is Danfoss Part Number 151-1286. It contains genuine high-pressure HNBR shaft seals, body O-rings, and backup rings. Use clean mineral oil during seal assembly to prevent tearing during slip-fit over the 25 mm keyed shaft.