Product Overview
The OMVW630 and OMV630 are key specifications in Danfoss’s OMV Series of ultra-large displacement low-speed, high-torque (LSHT) orbital hydraulic motors. Both offer 630cc-class displacement, with the OMVW version configured for wheel-mount applications (tapered shaft) and the OMV version configured for standard mount applications (cylindrical or splined shaft). The series covers displacements from 315 to 800 cm³/r with maximum continuous pressure up to 240 bar, maximum continuous torque up to 1880 N·m, and maximum continuous flow of 200 L/min. Featuring a Geroler roller-type displacement mechanism with an independently driven, hydraulically balanced disc valve synchronized by a universal shaft, the OMV Series minimizes hydraulic and mechanical losses while providing automatic wear compensation for sustained high volumetric efficiency.
The OMVW630 (151B0273/151B0268) and OMV630 (151B3187/151B3189) are 100% drop-in replacements for Danfoss OMV/OMVW Series motors, matching mounting flanges, shaft specifications, and port configurations exactly. The OMVW version features a 4-bolt wheel flange and tapered shaft for wheel-drive applications, while the OMV version features an SAE 4-bolt square flange and cylindrical shaft (or 16-tooth splined shaft) for general industrial drive applications. Every unit undergoes 100% simulated load testing before shipment.
Technical Specifications (Bulleted List)
OMVW630 151B0273 (Wheel Mount / Tapered Shaft)
Brand Series: Danfoss OMVW Series
Displacement: 630 cm³/rev (geometric 400.9 cm³/U)
Max Continuous Pressure Drop: 200 bar
Max Intermittent Pressure Drop: 240 bar
Max Peak Pressure Drop: 280 bar
Max Continuous Speed: 500 rpm
Max Intermittent Speed: 600 rpm
Max Continuous Torque: 1180 N·m
Max Intermittent Torque: 1410 N·m
Max Continuous Power: 53.5 kW
Max Intermittent Power: 64 kW
Max Continuous Flow: 200 L/min
Max Intermittent Flow: 240 L/min
Min Starting Torque (Continuous): 910 N·m
Min Starting Torque (Intermittent): 1090 N·m
Control Type: Disc valve, independently driven hydraulically balanced valve plate, automatic wear compensation
Bearing Type: Tapered roller bearings (front and rear)
Mounting Flange: 4-bolt wheel flange, width L1 = 29.0 mm
Shaft Type: Conical shaft
Port Size: 1″ GAS side port / 1/4″ GAS drain port
Rotation: Bi-directional
Weight: Approx. 35.5 kg
OMVW630 151B0268 (Wheel Mount / 50mm Cylindrical Shaft)
Brand Series: Danfoss OMVW Series
Displacement: 630 cm³/rev
Max Continuous Pressure Drop: 200 bar
Max Intermittent Pressure Drop: 240 bar
Max Continuous Speed: 320 rpm
Max Continuous Torque: 1660 N·m
Max Continuous Power: 48 kW
Max Continuous Flow: 200 L/min
Control Type: Disc valve, independently driven hydraulically balanced valve plate
Mounting Flange: 4-bolt wheel flange
Shaft Type: Ø50 mm cylindrical shaft
Port Size: 1″ GAS side port / 1/4″ GAS drain port
Rotation: Bi-directional
OMV630 151B3187 (Standard Mount / 16T Splined Shaft)
Brand Series: Danfoss OMV HD Series
Displacement: 630 cm³/rev
Max Continuous Pressure Drop: 240 bar
Max Continuous Torque: 1880 N·m
Max Continuous Flow: 200 L/min
Control Type: Disc valve, independently driven hydraulically balanced valve plate
Bearing Type: Tapered roller bearings (front and rear)
Mounting Flange: 4-bolt square flange, pilot Ø160 × 11 mm, bolt circle Ø200 mm
Shaft Type: 16-tooth splined shaft, Ø2-1/8″, M12 threaded end
Port Size: 1-5/16-12 UN main port / 9/16-18 UNF drain port
Rotation: Bi-directional
Weight: Approx. 37.8 kg
OMV630 151B3189 (Standard Mount / 50mm Cylindrical Shaft)
Brand Series: Danfoss OMV HD Series
Displacement: 630 cm³/rev
Max Continuous Pressure Drop: 240 bar
Max Continuous Torque: 1880 N·m
Max Continuous Flow: 200 L/min
Control Type: Disc valve, independently driven hydraulically balanced valve plate
Bearing Type: Tapered roller bearings (front and rear)
Mounting Flange: 4-bolt square flange, pilot Ø160 × 11 mm, bolt circle Ø200 mm
Shaft Type: Ø50 mm cylindrical shaft, parallel key A14×9×70 mm (DIN 6885)
Port Size: 1-5/16-12 UN main port / 9/16-18 UNF drain port
Rotation: Bi-directional
Key Technical Advantages
1. Disc Valve with Independent Drive and Automatic Wear Compensation
The OMV/OMVW Series features Danfoss’s advanced disc valve structure, with the valve plate synchronously and independently driven by a universal shaft to precisely control oil distribution to each working chamber, minimizing hydraulic and mechanical losses. The distribution face includes automatic wear compensation — the clearance does not increase with wear, maintaining high volumetric efficiency (>90%) throughout the motor’s service life. Optimized flow channel design further reduces pressure drop for energy savings under 200–240 bar operating conditions.
2. Geroler Roller-Type Displacement Mechanism with High Starting Torque
The displacement mechanism utilizes a Geroler roller-type gear set that replaces sliding friction with rolling friction, achieving mechanical efficiency far exceeding conventional Gerotor motors. The OMVW630 151B0273 delivers minimum starting torque of 1090 N·m at maximum intermittent pressure, ensuring reliable operation under heavy-load startup conditions. The optimized gear design ensures smooth and quiet operation, and the roller-equipped gear ring reduces frictional resistance and extends service life.
3. Tapered Roller Bearing System with High Load Capacity
Tapered roller bearings are installed at both front and rear ends of the output shaft, capable of withstanding high radial and axial loads simultaneously, allowing the motor to directly drive wheels, sprockets, and other heavy-duty working mechanisms without additional external bearing support. This design simplifies the drivetrain architecture, reduces overall system cost, and improves transmission reliability. The OMVW wheel-mount version is optimized for wheel drive with a tapered shaft-hub fit ensuring high concentricity.
4. Wide Temperature Range and Harsh Environment Adaptability
The OMV/OMVW Series operates reliably across a wide temperature range of -30°C to +90°C and is compatible with a wide variety of hydraulic fluids. The motor housing is constructed from high-strength cast iron, providing excellent pressure resistance and structural rigidity. The OMV630 151B3187 features a 16-tooth splined shaft and M12 threaded end, suitable for high-torque transmission and frequent reversing in heavy-duty industrial drive applications.
5. 100% Simulated Load Testing
Every OMV/OMVW Series motor is validated on a 100% simulated load test bench before shipment. Testing protocols cover continuous operation at rated pressure, cyclic intermittent pressure loading, peak torque output, and internal leakage measurement, ensuring delivered performance matches published specifications.
Application Areas
Construction Machinery: Skid steer loader travel drive, crusher bucket drive, trenchless drilling rig drive
Material Handling: Heavy-duty winch/haulage drive, conveyor drive, port lifting equipment
Agricultural Machinery: Fendt 900 Vario tractor front-end loader hydraulic drives, combine harvester travel drive
Forestry Equipment: Wood chipper drive, skidder winch drive
Municipal Equipment: Snow removal equipment drive wheels, road sweeper travel drive
Industrial Equipment: Heavy-duty belt drive units, specialty vehicle travel drive, machine tool feed drives
Expert Maintenance Tips
Pre-Installation Checklist: Verify system oil cleanliness meets ISO 22/20/16. Use a return filter rated at 10 μm or finer. For OMVW wheel-mount versions, ensure the 4-bolt wheel flange pilot fits flush against the mounting surface. Clean the shaft taper and hub taper before installation. Tighten the lock nut to specified torque. For OMV standard mount versions, ensure the 4-bolt square flange pilot Ø160 mm fits flush with bolt circle Ø200 mm aligned. Confirm proper key (A14×9×70 mm) fit between the Ø50 mm shaft and coupling.
Case Drain Configuration: The OMV/OMVW Series features a high-pressure shaft seal and typically operates without a drain line. When system back pressure exceeds the shaft seal rating, connect the drain port (1/4″ GAS for OMVW630, 9/16-18 UNF for OMV630). The drain line should remain unobstructed with the outlet submerged below reservoir oil level. Install a restrictor to maintain at least 3.5 bar case pressure, preventing air ingestion.
Break-In Procedure: Before full-load operation, run new or overhauled motors at no more than 30% of continuous ratings for at least 30 minutes. This allows the Geroler displacement mechanism, disc valve, and bearings to achieve optimal mating surfaces.
Fluid Management: Use 68# anti-wear hydraulic oil with working viscosity maintained at 20–75 cSt. Normal operating oil temperature should be 20–60°C, with ambient temperature not exceeding +90°C. Monitor oil cleanliness regularly; replace hydraulic fluid and clean filters immediately when contamination exceeds ISO 22/20/16.
Long-Term Storage: For storage exceeding 3 months, fill the motor interior with clean hydraulic oil and plug all ports to prevent internal corrosion. Before recommissioning, manually rotate the shaft to confirm free movement without binding.
