Product Overview
The OMV Series hydraulic motor is Danfoss’s (formerly Sauer-Danfoss) Orbitron™ large-displacement low-speed high-torque orbital motor family, spanning 5 displacement sizes from OMV315 to OMV800 with a range of 314.5–801.8 cm³/rev and maximum continuous power up to 53.5 kW. The series features a Geroler gearwheel set with disc valve and valve drive system, and tapered roller bearings at both front and rear ends, capable of withstanding high radial and axial loads. It is engineered for heavy-duty applications in construction machinery, mining equipment, and marine deck machinery. The OMV Series delivers high starting torque, constant output torque across a wide speed range, and a high-pressure shaft seal that eliminates the need for an external case drain line.
This product is a drop-in interchange replacement for genuine Danfoss OMV315 (151B3100) hydraulic motors. Mounting flange (4-bolt square flange, pilot Ø160.0mm, bolt circle Ø200.0mm), Ø50mm cylindrical shaft extension, G 1 main port, and G 1/4 drain port are dimensionally identical to OEM specifications, enabling direct replacement without hydraulic circuit or mounting modification. Every motor is subjected to 100% simulated actual-load testing before shipment, ensuring volumetric efficiency, output torque, and sealing performance meet OEM technical standards.
OEM Part Number Coverage:
Technical Specifications
OMV315 (151B3100) Core Specifications:
Model: OMV315 (OEM Part Number: 151B3100)
Geometric displacement: 314.5 cm³/rev (19.19 in³/rev)
Max continuous pressure differential: 200 bar (2900 PSI)
Max intermittent pressure differential: 240 bar (3480 PSI)
Peak pressure: 280 bar (4060 PSI)
Max continuous torque: 920 Nm (8140 lbf·in)
Max intermittent torque: 1110 Nm (9820 lbf·in)
Max continuous speed: 510 rpm
Max intermittent speed: 630 rpm
Max continuous power: 42.5 kW (57.0 hp)
Max intermittent power: 51.0 kW (68.4 hp)
Max continuous oil flow: 160 L/min (42.3 gal/min)
Max intermittent oil flow: 200 L/min (52.8 gal/min)
Max inlet pressure continuous: 210 bar (3050 PSI)
Max inlet pressure intermittent: 250 bar (3630 PSI)
Max inlet pressure peak: 300 bar (4350 PSI)
Max return pressure with drain line continuous: 140 bar (2030 PSI)
Max return pressure with drain line intermittent: 175 bar (2540 PSI)
Max return pressure with drain line peak: 210 bar (3050 PSI)
Min starting torque at max continuous pressure differential: 710 Nm (6280 lbf·in)
Min starting torque at max intermittent pressure differential: 850 Nm (7520 lbf·in)
Starting pressure with unloaded shaft: 8 bar (115 PSI)
Control type: Fixed displacement, disc valve with valve drive
Orbital gearwheel set type: Geroler
Mounting flange: 4-bolt square flange, pilot Ø160.0mm × height 11.0mm, bolt circle Ø200.0mm, hole Ø18.0mm
Shaft type: Ø50mm cylindrical, M12 × 1.75-6H thread in shaft end
Shaft key: A14 × 9 × 70 mm (DIN 6885)
Main ports: G 1 BSP, sideport staggered
Drain port: G 1/4 BSP
Rotation: Bi-directional
Shaft seal: NBR standard, Fluorocarbon (Viton) optional
Bearings: Tapered roller bearings, front and rear
Integral check valve: Standard
Seal kit part number: 151B0129
Weight: Approx. 24.2 kg
Contamination level: ISO 4406 22/20/16
Recommended oil viscosity: 20–75 cSt
Ambient temperature range: -30°C to +90°C
OMV Series Full Range Displacement & Power Comparison:
OMV315 (151B3100): Displacement 314.5 cm³/rev; Continuous power 42.5 kW
OMV400 (151B3101): Displacement 400.9 cm³/rev; Continuous power 53.5 kW
OMV500 (151B3102): Displacement 499.6 cm³/rev; Continuous power 53.5 kW
OMV630 (151B3103): Displacement 629.1 cm³/rev; Continuous power 48 kW
OMV800 (151B3104): Displacement 801.8 cm³/rev; Continuous power 42.5 kW
Key Technical Advantages
1. Geroler Gearwheel Set with Disc Valve Commutation System
The OMV Series utilizes Danfoss’s patented Geroler gearwheel set, where the stator ring gear and rotor transmit power through rolling engagement, significantly reducing friction compared to conventional fixed-tooth designs. Combined with the disc valve with valve drive commutation system, the motor maintains smooth operation and constant output torque across the full speed range, with volumetric efficiency consistently above 90%. This structure enables the OMV315 to deliver 920 Nm continuous torque at 510 rpm continuous speed, with minimum starting torque of 710 Nm — exceeding 77% of rated torque.
2. Dual Tapered Roller Bearing System — Superior Radial and Axial Load Capacity
The OMV315 features tapered roller bearings at both the output end and rear end, capable of simultaneously withstanding significant radial and axial loads. The line-contact load-bearing characteristics of tapered roller bearings provide excellent impact resistance and long service life under heavy-duty conditions. Combined with forced lubrication, the bearing system ensures stable output shaft rotational precision under demanding operating conditions. This bearing configuration allows the OMV315 to directly drive heavy wheels, winch drums, and slewing mechanisms without additional external bearing support.
3. High-Pressure Shaft Seal — No Case Drain Required
The OMV Series comes standard with a High Pressure Shaft Seal system providing reliable sealing across the full operating pressure range. This design eliminates the need for an external case drain line or check valves, simplifying hydraulic circuit routing and removing a common failure point. The OMV315 features an integral check valve for enhanced system safety and reliability. Shaft seal material is NBR standard, with Fluorocarbon (Viton) optional for different hydraulic fluid and temperature requirements.
4. Large Displacement Compact Design with High Power Density
The OMV315 achieves 42.5 kW continuous power output at 314.5 cm³/rev displacement, delivering high power density. The 4-bolt square flange mounting (pilot Ø160.0mm) with Ø50mm cylindrical shaft maintains a compact form factor while ensuring load-bearing capacity, particularly suitable for heavy-duty wheel drive and slewing drive applications with constrained installation space.
Application Areas
Heavy Construction Equipment: Large excavator track drive, rotary drilling rig slewing, heavy vibratory roller drum drive, wheel loader travel drive
Mining Equipment: Mine winch drive, drill feed mechanism, crusher drive, belt conveyor drive
Marine Deck Machinery: Anchor windlass drive, heavy mooring winch drive, deck crane slewing drive
Forestry Equipment: Harvester drive, forwarder winch drive, felling head drive
Special Vehicles: Heavy tow truck drive, airport snow blower auger drive, fire truck winch drive
Agricultural Machinery: Large combine harvester travel drive, large baler drive
Expert Maintenance Tips
Pre-Installation Preparation:
Clean all ports and mounting flanges with lint-free wipes or clean compressed air before installation. Verify O-ring integrity. Torque mounting bolts (M12) in a diagonal sequence over 2–3 passes to 137–150 N·m using a calibrated torque wrench. After installation, manually rotate the output shaft to confirm free and smooth rotation without binding. Check the clearance between the shaft key (A14 × 9 × 70 mm) and mating keyway; clearance should be maintained within 0.05–0.15 mm.
System Flushing & Air Bleeding:
Following initial installation or motor replacement, perform a system flush at low pressure (≤30 bar) for a minimum of 30 minutes to remove particulate contamination. Then run the motor at low speed and no load for 15–20 minutes to bleed air from the system. Observe for foam in the reservoir, system noise, or motor crawling — all indicating residual air. Continue bleeding until operation is smooth.
Hydraulic Fluid Management:
Use anti-wear hydraulic oil with ISO VG 46 or ISO VG 68 viscosity grade (corresponding to the 20–75 cSt operating viscosity range). Maintain fluid cleanliness at ISO 4406 22/20/16 minimum. Operating temperature should not exceed 80°C continuous; short-term peak up to 90°C (ambient temperature limit) is acceptable. Replace hydraulic fluid after the first 50 operating hours, then follow normal maintenance intervals.
Drain Port Management:
The OMV315 features a standard G 1/4 drain port and integral check valve. Route the drain line separately back to the reservoir with the end submerged below the oil level. Drain line back pressure should not exceed 2 bar. The integral check valve protects the shaft seal from system back pressure. The OMV315 allows a maximum continuous return pressure of 140 bar with a drain line, providing generous back pressure margin for system design.
Periodic Inspection:
Check volumetric efficiency every 500 operating hours or quarterly. Test method: lock the output shaft at rated pressure and measure leakage flow. If leakage exceeds 10% of rated flow, internal wear has entered an accelerated phase — schedule service or replacement. Also inspect shaft seals for seepage and tapered roller bearings for abnormal noise or vibration. The seal kit part number is 151B0129 and is recommended for spare parts inventory.
