Product Overview
The OMS Series is the classic medium-duty low-speed high-torque gerotor hydraulic motor family from Danfoss (formerly Sauer-Danfoss/White Drive Motors), spanning eight displacements from 80.5 cm³/rev to 401.9 cm³/rev. Featuring disc valve distribution and a roller-stator set with tapered roller bearing support, the OMS Series is specifically engineered for prolonged operation under severe conditions — high pressures, low speeds, low-viscosity oils, and frequent reversals.
The core engineering feature of the OMS Series is its disc valve driven by a separate small cardan shaft, combined with a balance plate design that minimizes hydraulic and mechanical losses. The result is high volumetric and mechanical efficiency even under high-pressure conditions. The series is a direct drop-in replacement for Danfoss/White OMS Series OEM motors of matching specification.
The flagship model in this batch, OMS315 151F5106, is the second-largest displacement in the OMS lineup, with a geometric displacement of 314.9 cm³/rev. It delivers 200 bar continuous pressure drop, 240 bar intermittent, and 260 bar peak, with 825 N·m continuous torque and up to 1000 N·m intermittent torque. Maximum continuous output power is 15 kW — making it an ideal choice for heavy-duty drive applications. Every unit undergoes 100% simulated load-condition bench testing before shipment.
Technical Specifications
OMS315 151F5106 (OMS Series)
Model: 151F5106 (Danfoss/White OMS 315)
Series: OMS Series 3
Displacement: 314.9 cm³/rev (nominal 315 cc/rev)
Max Continuous Speed: 240 rpm
Max Intermittent Speed: 285 rpm (intermittent values permitted max 10% of each minute)
Minimum Stable Speed: Approx. 5 rpm
Continuous Pressure Drop: 200 bar (230 bar max continuous inlet pressure)
Intermittent Pressure Drop: 240 bar
Peak Pressure Drop: 260 bar (peak values permitted max 1% of each minute)
Continuous Output Torque: 825 N·m
Intermittent Output Torque: 1000 N·m
Max Continuous Output Power: 15 kW
Intermittent Max Output Power: 17 kW
Max Continuous Flow: 75 L/min
Intermittent Max Flow: 90 L/min
Max Starting Pressure (unloaded shaft): 8 bar
Control Type: Disc valve distribution driven by separate cardan shaft; bidirectional rotation; speed infinitely adjustable via hydraulic flow
Mounting Flange: Standard 4-hole flange, 82.5 mm pilot diameter, 106.4 mm diagonal bolt center distance
Output Shaft: 32 mm cylindrical with parallel key (A10×8×45 DIN 6885)
Port Size: G 1/2 BSP, side ports staggered
Drain Port Size: G 1/4 BSP (drain line required when return pressure exceeds 10 bar)
Bearing Type: Tapered roller bearings (radial and axial load capable)
Material: Cast iron housing
Weight: Approx. 12.3 kg
Data source: Hidraoil distributor technical data, Hydrokit product page, and Danfoss OMS Series 3 technical bulletin (DKMH.PN.130.A1.02). Simultaneous operation at maximum speed and maximum pressure is not permitted. Intermittent values permitted max 10% of each minute; peak values permitted max 1% of each minute.
OMS200 151F0570 (OMS Series)
Model: 151F0570 (Danfoss/White OMS 200)
Series: OMS Series 3
Displacement: 200.9 cm³/rev (nominal 200 cc/rev)
Max Continuous Speed: 375 rpm
Max Intermittent Speed: 450 rpm
Continuous Pressure Drop: 160 bar (200 bar max continuous inlet pressure)
Intermittent Pressure Drop: 200 bar
Peak Pressure Drop: 225 bar
Continuous Output Torque: 438 N·m
Intermittent Output Torque: 540 N·m
Peak Output Torque: 576 N·m
Max Continuous Output Power: 14 kW
Max Continuous Flow: 75 L/min
Mounting Flange: Standard 4-hole flange, 82.5 mm pilot diameter
Output Shaft: 32 mm cylindrical with parallel key
Port Size: G 1/2 BSP
Drain Port Size: G 1/4 BSP
Bearing Type: Tapered roller bearings
Material: Cast iron housing
Weight: Approx. 11.1 kg
Data source: Eternal Hydraulic OMS Series technical data table and White Drive OMS 200 product data.
OMS125 (OMS Series)
Model: OMS 125 (OMSS/OMSW 125 Series)
Displacement: 126.3 cm³/rev (nominal 125 cc/rev)
Max Continuous Speed: 600 rpm
Max Intermittent Speed: 720 rpm
Continuous Pressure Drop: 175 bar (17.5 MPa)
Intermittent Pressure Drop: 200 bar (20 MPa)
Peak Pressure Drop: 225 bar (22.5 MPa)
Continuous Output Torque: 303 N·m
Intermittent Output Torque: 345 N·m
Peak Output Torque: 373 N·m
Max Continuous Output Power: 16 kW
Max Continuous Flow: 75 L/min
Mounting Flange: Standard 4-hole flange, 82.5 mm pilot diameter
Output Shaft: 32 mm cylindrical with parallel key
Bearing Type: Tapered roller bearings
Material: Cast iron housing
Weight: Approx. 10.3 kg
Data source: Eternal Hydraulic OMS Series technical data table.
OMS250 (OMS Series)
Model: OMS 250 (OMSS/OMSW 250 Series)
Displacement: 252.6 cm³/rev (nominal 250 cc/rev)
Max Continuous Speed: 300 rpm
Max Intermittent Speed: 360 rpm
Continuous Pressure Drop: 200 bar
Intermittent Pressure Drop: 250 bar
Peak Pressure Drop: 270 bar
Continuous Output Torque: 720 N·m
Intermittent Output Torque: 870 N·m
Max Continuous Output Power: 14.5 kW
Intermittent Max Output Power: 18.0 kW
Max Continuous Flow: 75 L/min
Mounting Flange: Standard 4-hole flange, 82.5 mm pilot diameter
Output Shaft: 32 mm cylindrical with parallel key
Bearing Type: Tapered roller bearings (front and rear)
Material: Cast iron housing
Weight: Approx. 11.6 kg
Data source: Neilson Hydraulics White Drive OMS 250 product page and Lunsa OMS250 product data.
Key Technical Advantages
1. Separate Cardan Shaft Driven Disc Valve with Balance Plate Design
The core engineering innovation of the OMS Series is its disc valve driven by a separate small cardan shaft, combined with a balance plate design. This structure allows the valve plate to automatically maintain optimal contact with the rotor end face during operation, minimizing hydraulic and mechanical losses. The result is high volumetric and mechanical efficiency even under high-pressure conditions, with system energy efficiency significantly superior to conventional shaft-distribution designs.
2. Tapered Roller Bearings for High Radial and Axial Load Capacity
The OMS315 151F5106 and all OMS Series models use tapered roller bearings to support the output shaft, with tapered roller bearings at both front and rear. This bearing configuration enables the motor to withstand significant dynamic and static radial loads as well as axial loads, allowing direct drive of chain sprockets, gears, and other mechanisms subject to radial forces without additional bearing housings.
3. OMS Series 3 Durability Optimization
Danfoss introduced the OMS Series 3 in 2000 with several important optimizations over the original OMS: improved output efficiency at high pressures, increased permissible pressure and torque values, and significantly improved service life under high loads. The OMS315 151F5106 is a Series 3 version, using the “151F0506” new code system, representing higher performance levels and longer service life.
4. Cast Iron Housing and High Power Density
The entire OMS Series features cast iron housings for excellent rigidity and durability. The OMS315 delivers 825 N·m continuous torque and 15 kW continuous power at 314.9 cm³/rev displacement — power density that leads its class among medium-duty orbit motors. Standardized 4-hole mounting flanges and 32 mm cylindrical keyed shaft configurations allow flexible adaptation across different drive requirements.
Application Areas
Construction Machinery: Excavator travel drives, skid-steer loader travel systems, compact track chassis drives
Agricultural Machinery: Combine harvester drive systems, tractor implement drives, spraying equipment
Material Handling: Conveyor drives, winch and hoist mechanisms, auger drives
Municipal Equipment: Snow removal auger drives, street sweeper brush drives
Marine & Offshore: Deck machinery winches, anchor windlass drives
Industrial Drives: Specialty production line rotary mechanisms, machine tool hydraulic clamping drives
Expert Maintenance Tips
Installation Guidelines:
Before installation, verify system oil cleanliness meets ISO 18/13 or better. The OMS Series disc valve is driven by a separate cardan shaft, making it more sensitive to particulate contamination. Install a 10μm filter upstream of the motor inlet.
The OMS315 151F5106 uses a 32 mm cylindrical keyed shaft (A10×8×45 DIN 6885). Ensure proper fit precision between the key and equipment-side keyway. Shaft alignment must be within 0.05mm using a flexible coupling.
When return line pressure exceeds 10 bar, the G 1/4 BSP drain port must be connected to route case leakage separately back to the reservoir. Keep the drain line unobstructed and ensure case pressure does not exceed the shaft seal rating.
During initial commissioning, run at no more than 30% of rated pressure for at least 30 minutes of no-load break-in to allow the valve plate and rotor end face to seat properly.
Operational Maintenance:
Normal operating oil temperature should not exceed 80°C. Monitor case temperature regularly; if abnormally high, prioritize checking distribution face wear or system internal leakage.
Use premium anti-wear hydraulic oil with viscosity maintained at 20-43 cSt at operating temperature. The OMS Series is particularly suited for low-viscosity oil applications, but avoid oil with excessive water content.
Inspect volumetric efficiency every 2,000 hours or every 12 months. If efficiency drops by more than 10% of rated value, disassemble and inspect the valve plate and roller-stator assembly.
