151-0029 Danfoss OMP 80 Orbital Hydraulic Motor

Product Overview

The Danfoss OMP, OMR and OMM Series are established LSHT (Low-Speed High-Torque) orbital hydraulic motor platforms designed for compact, reversible and high-torque hydraulic drives.

The requested product references include:

• OMP 80 — 151-0029
• OMP 200 — 151-5250
• OMR 200
• OMR 250
• OMM 50 — 151G0013

These are different motor families and should not be treated as a single interchangeable platform.

Danfoss continues to maintain historical OMP product information and service documentation through its PowerSource archive, even where individual products have been discontinued.

The OMP and OMR families are medium-size orbital motor platforms, while OMM is a more compact motor family intended for lighter-duty applications. Danfoss technical literature places OMP and OMR in the medium-size orbital motor category and OMM among the smaller orbital motors.

For replacement applications, complete part-number matching is essential because mounting, shaft, ports, bearings, seals and valve options can vary significantly.

Technical Specifications

OMP 80 — 151-0029

Public cross-reference documentation identifies 151-0029 as an OMP 80 configuration.

• Brand: Danfoss / Sauer-Danfoss
• Series: OMP
• Product Type: LSHT Orbital / Gerotor Hydraulic Motor
• Part Number: 151-0029
• Motor Size: OMP 80
• Geometric Displacement: 80.0 cm³/rev
• Displacement: 4.88 in³/rev
• Mounting Flange: SAE A oval flange
• Centering Diameter: 82.5 mm
• Shaft: Cylindrical Ø25 mm
• Shaft Key: A8 × 7 × 32 mm, DIN 6885
• Port Style: Side port
• Port Thread: BSPP
• Minimum Speed: Approximately 10 rpm
• Maximum Continuous Speed: 755 rpm
• Maximum Intermittent Speed: 945 rpm
• Maximum Continuous Pressure Drop: 140 bar
• Maximum Intermittent Pressure Drop: 175 bar
• Peak Pressure Drop: 225 bar
• Maximum Continuous Flow: 60 L/min
• Maximum Intermittent Flow: 75 L/min
• Maximum Continuous Torque: 151 Nm
• Maximum Intermittent Torque: 195 Nm
• Minimum Starting Torque: 132 Nm continuous / 168 Nm intermittent
• Maximum Continuous Output: 10.2 kW
• Maximum Intermittent Output: 12.5 kW
• Return Pressure with Drain: 175 bar continuous / 200 bar intermittent / 225 bar peak

OMP 200 — 151-5250

The 151-5250 configuration is identified as OMP 200 with a Ø25 mm cylindrical shaft, special SAE A mounting and rear G1/2 ports.

• Brand: Danfoss / Sauer-Danfoss / White Drive legacy platform
• Series: OMP
• Product Type: LSHT Orbital / Gerotor Hydraulic Motor
• Part Number: 151-5250
• Motor Size: OMP 200
• Geometric Displacement: 200 cm³/rev
• Shaft: Cylindrical Ø25 mm
• Center Tap: M8
• Shaft Key: A8 × 7 × 32 mm
• Mounting: 2-bolt SAE A special flange
• Pilot Diameter: 82.5 mm
• Bolt Circle: 106.4 mm
• Port: G1/2 rear port
• Bearing: Journal bearing
• Shaft Seal: HNBR high-pressure
• Check Valve: Yes
• Integrated Shock Valves: 80 bar / 1,160 psi
• Paint: No paint
• Weight: 9.22 kg

This should be treated as the specification of the 151-5250 configuration, not as a universal specification for every OMP 200 motor.

OMR 200 / OMR 250

Danfoss officially identifies OMR as a medium-size orbital motor family.

However, because the original request does not provide complete OMR 200 and OMR 250 configuration numbers, the exact pressure, speed, flow, torque and weight cannot be responsibly assigned to these two references from the available official documentation reviewed here.

For engineering replacement, the complete OMR part number should be verified before specifying:

• Displacement
• Maximum speed
• Continuous/intermittent pressure
• Torque
• Port configuration
• Shaft configuration
• Bearing arrangement

OMM 50 — 151G0013

Danfoss PowerSource directly identifies 151G0013 as OMM 50 Hydraulic Motor.

Published configuration data provides:

• Brand: Danfoss / White Drive
• Series: OMM
• Part Number: 151G0013
• Displacement: 50.3 cm³/rev
• Shaft Type: Cylindrical
• Shaft Diameter: 16 mm
• Center Tap: M6
• Shaft Key: A5 × 5 × 16 mm, DIN 6885
• Mounting: 3-bolt round flange
• Pilot Diameter: 31.5 mm
• Bolt Circle: 45 mm
• Working Ports: G3/8 BSP side ports
• Drain Port: G1/8 BSP
• Check Valve: Yes
• Shaft Seal: NBR standard
• Maximum Continuous Pressure: 140 bar
• Maximum Intermittent Pressure: 175 bar
• Peak Pressure: 225 bar
• Maximum Continuous Speed: 400 rpm
• Maximum Intermittent Speed: 500 rpm
• Maximum Continuous Torque: 46 Nm
• Maximum Intermittent Torque: 88 Nm
• Maximum Continuous Power: 2.4 kW
• Maximum Intermittent Power: 3.2 kW
• Recommended Oil Viscosity: 20–75 cSt
• Net Weight: Approximately 2.40 kg

Control Method

OMP, OMR and OMM are fixed-displacement orbital motors.

Their operating principle is:

• Motor speed: primarily controlled by hydraulic flow
• Available torque: primarily determined by differential pressure and displacement
• Rotation direction: changed by reversing hydraulic flow
• Displacement control: fixed displacement; no integrated variable-displacement mechanism

System-level speed and load control is therefore normally achieved through the hydraulic pump, directional valve, proportional flow control and pressure-control circuit.

Key Technical Advantages

1. LSHT Gerotor Architecture

OMP, OMR and OMM use orbital/gerotor powertrain technology designed for:

• Low-speed rotation
• High starting torque
• Reversible operation
• Compact hydraulic packaging
• Frequent start-stop duty

This architecture is especially effective for agricultural, mobile and material-handling machinery.

2. Fixed-Rim Gearwheel Set

Danfoss / White Drive product information identifies the fixed-rim gearwheel set as an important design feature.

This supports:

• Stable gear engagement
• Consistent torque transmission
• Reduced mechanical fluctuation
• Long-term operating reliability

3. Spool Valve Integrated with the Output Shaft

The orbital motor design incorporates a spool valve integrated with the output shaft.

This architecture helps maintain:

• Compact internal packaging
• Controlled commutation
• Stable directional switching
• Efficient hydraulic-to-mechanical transmission

4. Multiple Shaft and Mounting Configurations

The O-series platform is available in configurations including:

• Cylindrical shafts
• Splined shafts
• Tapered shafts
• SAE flanges
• Special flanges
• Side ports
• Rear ports

The requested examples illustrate the importance of complete part-number matching:

151-0029 → Ø25 mm cylindrical shaft

151-5250 → Ø25 mm cylindrical shaft + special SAE A flange

151G0013 → Ø16 mm cylindrical shaft + 3-bolt round flange

5. Compact OMM Architecture

OMM 50 is substantially smaller and lighter than the OMP 200 configuration.

At approximately 2.40 kg, the OMM 50 is well suited to compact hydraulic drives where installation space and total machine weight are important.

6. Bearing Options for Different Mechanical Loads

Different O-series configurations may use journal, needle or roller-bearing arrangements.

Bearing selection should therefore be evaluated according to:

• Radial load
• Axial load
• Shaft speed
• Load position
• Required bearing life

A bearing specification from one motor configuration should not automatically be applied to the entire series.

Application Areas

OMP 80 — 151-0029

Typical applications include:

• Agricultural machinery
• Compact conveyors
• Material handling
• Small hydraulic winches
• Sweepers
• Light construction machinery
• Mobile hydraulic equipment

OMP 200 — 151-5250

Typical applications include:

• Agricultural machinery
• Construction equipment
• Conveyor drives
• Material handling equipment
• Hydraulic winches
• Industrial rotary drives
• Mobile machinery

The Ø25 mm shaft, special SAE A mounting and integrated 80-bar shock valves make the configuration particularly relevant to retrofit and replacement applications.

OMR 200 / OMR 250

Typical target applications include:

• Agricultural machinery
• Forestry equipment
• Material handling
• Construction equipment
• Industrial drives
• Conveyors
• Hydraulic winches

Exact application suitability should be confirmed against the complete OMR configuration.

OMM 50 — 151G0013

Typical applications include:

• Agricultural attachments
• Mobile conveyors
• Harvesting equipment
• Hay balers
• Side trimmers
• Compact material-handling equipment

Danfoss/White Drive documentation specifically associates OMM/OML products with agricultural equipment, mobile conveyors and harvesting machinery.

Expert Maintenance Tips

1. Always Purchase by Complete Part Number

Do not specify only:

OMP 80
OMP 200
OMM 50

Use the complete verified reference:

151-0029
151-5250
151G0013

For OMR 200 and OMR 250, obtain the complete configuration code before final technical approval.

2. Verify Shaft Alignment

Inspect:

• Shaft concentricity
• Pilot fit
• Coupling alignment
• Spline engagement
• Mounting-face flatness

Poor alignment can increase bearing loads and accelerate shaft-seal wear.

3. Calculate External Shaft Loads

For sprocket, gear, pulley and wheel applications, evaluate:

Torque + Radial Load + Load Distance + Speed + Bearing Life

rather than relying on output torque alone.

4. Pay Attention to High-Speed Operation on OMP 80

The 151-0029 configuration is published with a 755 rpm continuous and 945 rpm intermittent maximum speed.

At high speed, temperature, return pressure, shaft load and internal leakage should be monitored carefully.

5. Verify Shock-Valve Configuration on OMP 200

The 151-5250 configuration includes integrated 80-bar shock valves.

A replacement motor without the same valve functionality may behave differently during sudden stopping, impact loading or directional reversal.

6. Maintain Hydraulic Fluid Quality

Recommended service inspections include:

• Hydraulic-fluid cleanliness
• Correct viscosity
• Filter condition
• Oil temperature
• Return-line restriction
• Pressure spikes

The published OMM 50 configuration specifies an oil-viscosity range of 20–75 cSt.

7. Perform 100% Simulated Operating-Condition Testing

For replacement OMP / OMR / OMM motors, our recommended QA program includes:

• Displacement verification
• Pressure testing
• Flow testing
• Speed testing
• Starting-torque testing
• Continuous-torque testing
• Internal-leakage testing
• Rotation-direction testing
• Shaft runout inspection
• Bearing inspection
• Temperature-rise testing
• Noise and vibration testing
• Complete configuration verification

The engineering target is:

Dimensional Interchangeability + Hydraulic Performance Equivalence + Functional Reliability