Product Overview
The Danfoss OMR/OMV Series orbital hydraulic motors represent the global benchmark in low-speed, high-torque (LSHT) hydraulic motor technology, operating on the volumetric principle combining a Gerotor gear set with a disc valve or spool valve distribution system. The OMR Series is a medium-duty motor range spanning displacements of 36–400 cm³/r, with maximum continuous pressure up to 200 bar and maximum continuous torque of 400 Nm. The OMV Series targets medium-to-heavy-duty applications with displacements from 314.5 to 801.8 cm³/r, pressure ratings up to 275 bar, and maximum continuous torque reaching 1,880 Nm.
The three core models covered herein — OMR 315 (151-0417), OMR 200 (151-0715), and OMV 315 (151B3287) — are manufactured to Danfoss OEM specifications with 100% drop-in interchangeability. Mounting flange dimensions, shaft specifications, and port configurations correspond exactly to genuine Danfoss products, requiring no modification to piping or drivetrain interfaces. Every unit undergoes 100% simulated duty-cycle testing before shipment, verifying volumetric efficiency, torque output, and seal integrity. The OMR Series comes standard with a high-pressure shaft seal, enabling operation without a case drain line under elevated return pressure conditions.
Technical Specifications
OMR 315 (Model Code: 151-0417):
Model: OMR 315
Danfoss Reference: 151-0417
Brand: Danfoss / Sauer-Danfoss OMR Series
Geometric Displacement: 315 cm³/r (315.7 cm³/rev)
Max. Speed: 190 rpm
Max. Continuous Torque: 400 Nm
Max. Power: 5.0 kW
Max. Flow: 60 L/min
Max. Inlet Pressure: 175 bar
Max. Pressure Drop: 70 bar (continuous)
Mounting Flange: SAE-A 2-bolt oval flange
Shaft: 25 mm cylindrical, parallel key A8×7×32 mm (DIN 6885)
Port: G 1/2″ BSP
Shaft Seal: High-pressure shaft seal
Rotation: Bidirectional reversible
Weight: Approx. 9.04 kg
OMR 200 (Model Code: 151-0715):
Model: OMR 200
Danfoss Reference: 151-0715
Brand: Danfoss / Sauer-Danfoss OMR Series
Geometric Displacement: 199.8 cm³/r
Max. Speed: 300 rpm (intermittent)
Max. Continuous Torque: 300 Nm
Max. Power: 8.0 kW (intermittent)
Max. Flow: 60 L/min
Max. Inlet Pressure: 175 bar
Max. Pressure Drop: 110 bar (continuous)
Mounting Flange: 2-bolt flange (SAE-A standard)
Shaft: 25 mm cylindrical, parallel key 8 mm width
Port: G 1/2″ BSP
Shaft Seal: High-pressure shaft seal
Rotation: Bidirectional
Weight: Approx. 3.63 kg
OMV 315 (Model Code: 151B3287):
Model: OMV 315
Danfoss Reference: 151B3287
Brand: Danfoss / Sauer-Danfoss OMV Series
Geometric Displacement: 314.5 cm³/r (19.19 in³/r)
Max. Continuous Inlet Pressure: 210 bar (3050 psi)
Max. Intermittent Inlet Pressure: 250 bar (3630 psi)
Max. Peak Pressure: 300 bar (4350 psi)
Mounting Flange: 4-bolt square flange, bolt circle dia. 200 mm
Shaft: 50 mm straight shaft with M12 threaded end, key A14×9×70 mm (DIN 6885)
Port: G 1″, side-ported offset manifold (4×M12)
Drain Port: G 1/4″ standard bearing housing drain
Shaft Seal: Standard NBR
Bearings: Tapered roller bearings, front and rear
Rotation: Clockwise / counterclockwise reversible
Weight: Approx. 31.8 kg (gross)
Key Technical Advantages
1. High-Pressure Shaft Seal with Case-Drain-Free Design
The OMR Series features a high-pressure shaft seal that permits reliable operation under elevated return pressure while eliminating the need for an external case drain line. From an engineering perspective, this design carries significant implications for compact travel drive systems: a conventional motor requiring a drain line not only adds plumbing complexity but also introduces a potential leak point in the vibration-rich environment of travel mechanisms. The case-drain-free design gives the OMR Series a distinct system integration advantage in space-constrained travel drives such as skid steer loaders and aerial work platforms.
2. OMV Series Tapered Roller Bearings for Heavy-Duty Axial Load Capacity
The OMV 315 (151B3287) employs tapered roller bearings at both front and rear positions, simultaneously accommodating high radial and axial loads. The engineering significance of this configuration lies in the fact that when the motor directly drives a sprocket or gear, radial loads from the drivetrain and axial thrust act simultaneously on the output shaft. The conical raceway geometry of tapered roller bearings decomposes and distributes these combined loads uniformly across the roller contact surfaces, preventing premature fatigue failure that would occur with single-axis bearings under combined loading.
3. OMR Series Pressure-Compensated Balance Plate for High-Pressure Efficiency
The OMR Series employs a pressure balance plate that flexes toward the rotor during startup to minimize internal leakage, then relaxes at operating pressure to reduce mechanical friction losses. This dynamic “seal-on-start, release-on-run” mechanism allows the OMR Series to maintain stable volumetric efficiency at 175 bar operating pressure, delivering maximum continuous torque of 400 Nm.
4. Modular Platform with Broad Interchange Compatibility
The Danfoss O-Series is built on a modular design platform, with the OMR Series sharing interface-level compatibility with the OMP, OMH, OMS, OMT, and OMV series in terms of flanges, shafts, and ports. The platform enables drop-in interchange with Eaton Char-Lynn H/S/2000/6000 series, Parker TG/TL series, and M+S MR/MS/MT series motors. For equipment operators, this translates into shorter lead times and more favorable cost structures for replacement motors that match original products in form, fit, and function.
5. Cast Iron Housing with High Radial and Axial Load Capacity
Both OMR and OMV series motors utilize high-strength cast iron housings with precision-machined critical mating surfaces. The OMV Series, paired with tapered roller bearings in a cast iron housing, maintains structural rigidity and dimensional stability under high-torque output, making it suitable for heavy-duty intermittent shock applications such as crushers and winches.
Application Areas
Construction Equipment: Skid steer wheel drives, mini excavator travel motors, aerial work platform drives, trenchers
Agricultural Equipment: Combine header drives, auger drives, irrigation equipment, tractor attachment drives
Material Handling: Forklift travel drives, conveyor drives, hydraulic winches
Lawn & Turf Equipment: Zero-turn mower wheel drives, golf course maintenance equipment
Forestry Equipment: Wood chipper drives, forestry feed systems
Specialty Vehicles: Street sweepers, snow removal equipment, municipal maintenance vehicles
Expert Maintenance Tips
Installation Notes:
The OMR 315 (151-0417) uses an SAE-A 2-bolt oval flange with a 25 mm cylindrical shaft and A8×7×32 mm parallel key. Verify the flange bolt pattern matches the host machine before installation.
The OMV 315 (151B3287) uses a 4-bolt square flange (200 mm bolt circle) with a 50 mm straight shaft featuring an M12 threaded end. Ensure the flange face is clean and free of debris; apply Danfoss-recommended torque values to flange bolts (M12 bolts: 70–80 Nm recommended).
Apply a light coating of grease to spline or keyed shaft surfaces before assembly to prevent corrosion and ensure smooth engagement.
The OMV 315 features a standard G 1/4″ drain port. Route the drain line separately to the reservoir (below oil level) and avoid sharing it with the main return line.
Operation & Maintenance:
Replace the hydraulic oil filter after the first 50 hours of operation and verify fluid cleanliness to NAS Level 9 or ISO 18/16/13 or better.
Recommended oil viscosity range is 20–75 cSt; maintain normal operating oil temperature between 20°C and 60°C.
The OMR Series can operate without a case drain line provided case pressure remains within shaft seal limits. If system return back-pressure is persistently elevated, an independent drain line is recommended.
After extended storage, run the motor at low speed and light load for 10–15 minutes to re-establish the internal oil film before gradually applying full load.
