151B3020 Danfoss OMT 250 Orbital Hydraulic Motor

Product Overview

The Danfoss OMT, OMR and OMP X Series are LSHT (Low-Speed High-Torque) orbital hydraulic motor platforms designed for demanding mobile, agricultural, material-handling and industrial rotary-drive applications.

The requested references are:

• OMT 250 — 151B3020
• OMR 315 — 151-0246
• OMP X 315 — 11186712

These should not be treated as one interchangeable motor family.

Danfoss PowerSource identifies 151B3020 as an OMT 250 hydraulic motor with 251.8 cm³/rev geometric displacement and a specific Geroler, disc-valve and tapered-roller-bearing configuration.

Danfoss PowerSource identifies 151-0246 as an OMR 315 hydraulic motor and marks it as a discontinued historical product while retaining technical and service documentation.

Most importantly, Danfoss identifies 11186712 as OMP X 315, not simply OMP 315. Its complete official model code specifies the displacement, A2/B11 mounting, G1/2 side ports, 25 mm cylindrical shaft, high-pressure NBR shaft seal, G1/4 drain and check-valve configuration.

Technical Specifications

OMT 250 — 151B3020

• Brand: Danfoss
• Series: OMT
• Product Type: LSHT Orbital Hydraulic Motor
• Part Number: 151B3020
• Complete Model Code: OMT-0250-A-NN-G21-AD-1D-H10-A-A-1B-1-N-NN-NNNNN-NN-NN-NN-SP-NNN
• Motor Size: OMT 250
• Geometric Displacement: 251.8 cm³/rev
• Displacement: 15.36 in³/rev
• Motor Function: Standard
• Gearwheel Set: Geroler
• Valve System: Disc valve with valve drive
• Mounting: 4-bolt square
• Pilot: 125.0 mm × 11.0 mm
• Bolt Circle: 160.0 mm
• Mounting Hole: 14.0 mm
• Shaft Type: PTO
• Shaft Diameter: 1-3/8 inch
• Shaft Standard: DIN 9611
• Main Ports: G3/4
• Port Style: Sideport, staggered
• Additional Mounting Threads: 4 × M10
• Drain Port: G1/4
• Check Valve: Yes
• Hydraulic Valve Function: None
• Sensor: None
• Shaft Seal: NBR, standard
• Front Bearing: Tapered roller bearing
• Rear Bearing: Tapered roller bearing
• Painted: No
• Seal Kit: 151B0113

Official Danfoss OMT motor-size performance data specifies:

• Maximum Continuous Speed: 500 rpm
• Maximum Intermittent Speed: 600 rpm
• Maximum Continuous Torque: 730 Nm
• Maximum Intermittent Torque: 880 Nm
• Maximum Continuous Output: 33.5 kW
• Maximum Intermittent Output: 40.0 kW
• Maximum Continuous Differential Pressure: 200 bar / 2,900 psi
• Maximum Intermittent Differential Pressure: 240 bar / 3,480 psi
• Peak Differential Pressure: 280 bar / 4,060 psi
• Maximum Continuous Flow: 125 L/min / 33.0 US gal/min
• Maximum Intermittent Flow: 150 L/min / 39.6 US gal/min
• Maximum Starting Pressure with Unloaded Shaft: 10 bar / 145 psi

OMR 315 — 151-0246

Danfoss PowerSource confirms:

• Brand: Danfoss
• Series: OMR
• Product Type: Orbital Hydraulic Motor
• Part Number: 151-0246
• Motor Size: OMR 315
• Product Status: Discontinued
• Documentation: Drawings, service information and product documents remain available

Danfoss technical training material specifically uses OMR 315 as a hydraulic flow-calculation example:

• Displacement: 315 cm³/rev
• Reference Speed: 116 rpm
• Calculated Flow: 36.5 L/min

The calculation is:

116 rpm × 315 cm³/rev ÷ 1000 = 36.5 L/min

The current official PowerSource page does not expose the complete performance specification for the exact 151-0246 configuration. Therefore, continuous pressure, intermittent pressure, peak pressure, maximum speed, torque, shaft configuration and weight are intentionally not assigned here without a configuration-specific Danfoss document.

OMP X 315 — 11186712

The official Danfoss PowerSource record identifies this product specifically as OMP X 315.

• Brand: Danfoss
• Series: OMP X
• Product Type: LSHT Orbital Hydraulic Motor
• Part Number: 11186712
• Motor Size: OMP X 315
• Displacement: 315 cm³/rev
• Motor Type: Standard
• Mounting: B11 / A2 flange
• Pilot Diameter: 82.5 mm
• Pilot Height: 8 mm
• Bolt Circle: 106.4 mm
• Main Ports: G1/2
• Port Style: Side port, offset
• Shaft: Cylindrical 25 mm
• Key: Straight key
• Shaft-End Thread: M8
• Shaft Seal: High-pressure NBR
• Dust Seal: Integrated in shaft seal
• Drain: G1/4
• Check Valve: Yes
• Brake Release Port: None
• Speed Sensor: None
• Valve Option: None
• Paint: No Paint
• Packaging: Single Pack
• Status: Discontinued

Official model code:

OMPX-315-NNN-B11-SO-A3-A11-C-E-B-1-N-N-NN-NNN-NNN-NNN-A-NN

Control Method

The OMT, OMR and OMP X platforms use fixed-displacement orbital motor architecture.

The fundamental hydraulic relationships are:

Hydraulic Flow → Motor Speed

Differential Pressure × Displacement → Available Output Torque

Therefore:

• Displacement: Fixed
• Speed Control: Hydraulic flow
• Torque Generation: Differential pressure
• Rotation Direction: Hydraulic flow direction
• Variable Displacement Control: Not integrated in the standard motor architecture

Danfoss describes its orbital motor platforms as providing smooth running, constant operating torque over a wide speed range, high starting torque, high efficiency, high radial and axial bearing capacity and robust compact construction.

Key Technical Advantages

1. Geroler Orbital Powertrain

The exact 151B3020 OMT 250 configuration uses a Geroler orbital gearwheel set combined with a disc valve with valve drive.

This powertrain architecture is designed for efficient conversion of hydraulic energy into low-speed rotary mechanical output.

2. Tapered Roller Bearings

The 151B3020 configuration uses tapered roller bearings at both the front and rear.

This is valuable in mechanically loaded drives involving:

• Sprockets
• Gears
• Wheels
• Pulleys
• PTO-related drives

Actual bearing capability must still be calculated from the applied external loads.

3. High Torque at Low Speed

For OMT 250, Danfoss specifies:

• 500 rpm continuous maximum speed
• 730 Nm continuous maximum torque
• 880 Nm intermittent maximum torque

This operating profile is well suited to direct-drive hydraulic applications where low-speed torque is more important than high rotational speed.

4. High Return-Pressure Capability

Danfoss technical information gives maximum pressure values for the OMT platform, including:

• 210 bar continuous maximum inlet pressure
• 250 bar intermittent
• 300 bar peak

For configurations with a drain connection, maximum return pressure is:

• 140 bar continuous
• 175 bar intermittent
• 210 bar peak

The actual limit must still be verified for the specific shaft-seal and drain configuration.

5. Multiple Mechanical Interfaces

The OMT platform supports multiple shaft and mounting arrangements, including cylindrical, splined, tapered and PTO shaft configurations, as well as standard flange, wheel, brake-wheel and short-motor designs.

For example:

151B3020 → PTO shaft + 4-bolt square mounting

11186712 → 25 mm cylindrical shaft + A2/B11 mounting

This demonstrates why exact part-number matching is essential for replacement engineering.

6. Compact OMP X 315 Interface

The 11186712 OMP X 315 configuration uses:

• 82.5 mm pilot
• 106.4 mm bolt circle
• 25 mm cylindrical shaft
• G1/2 side ports
• G1/4 drain

This combination makes the configuration particularly relevant to retrofit applications where an existing mechanical and hydraulic interface must be preserved.

Application Areas

OMT 250 — 151B3020

Typical applications include:

• Agricultural machinery
• Construction equipment
• Material handling equipment
• Industrial conveyors
• Forestry machinery
• Agricultural attachments
• Hydraulic rotary drives
• PTO-driven machinery

Danfoss identifies orbital motors for construction, agriculture, material handling and lifting, forestry, lawn and turf, machine tools, stationary equipment, marine equipment and special-purpose applications.

OMR 315 — 151-0246

Typical target applications include:

• Agricultural machinery
• Forestry equipment
• Conveyor drives
• Material handling systems
• Mobile hydraulic equipment
• Industrial rotary equipment

The exact application should be verified against the historical configuration drawing for 151-0246.

OMP X 315 — 11186712

Typical applications include:

• Agricultural machinery
• Compact construction equipment
• Material handling
• Conveyor systems
• Mobile hydraulic equipment
• Auxiliary rotary drives
• Forestry applications

The 25 mm cylindrical shaft, A2/B11 mounting, G1/2 side ports and G1/4 drain are specifically defined by the Danfoss configuration record.

Expert Maintenance Tips

1. Keep OMT, OMR and OMP X Separate

The verified product identities are:

151B3020 → OMT 250

151-0246 → OMR 315

11186712 → OMP X 315

Do not market 11186712 simply as OMP 315 because Danfoss officially identifies it as OMP X 315.

2. Verify the PTO Interface on 151B3020

The exact OMT 250 configuration uses:

• 1-3/8 inch PTO shaft
• DIN 9611
• 4-bolt square mounting
• 125 mm pilot
• 160 mm bolt circle

The replacement motor should match the shaft interface, pilot, bolt circle and axial engagement.

3. Verify the 25 mm Shaft on 11186712

The OMP X 315 configuration specifies:

25 mm cylindrical shaft + straight key + M8 shaft-end thread

A different shaft diameter or key geometry must not be substituted simply because the displacement is also 315 cm³/rev.

4. Use Configuration-Specific Documentation for 151-0246

Danfoss officially confirms 151-0246 = OMR 315, but the current PowerSource page does not expose the complete performance specification.

For engineering approval, obtain:

Nameplate + Complete Part Number + Original Drawing

before specifying a replacement.

5. Respect OMT 250 Pressure Limits

Do not use the 300-bar peak figure as a continuous operating pressure.

Danfoss specifies OMT 250:

• 200 bar continuous differential pressure
• 240 bar intermittent
• 280 bar peak

6. Control Return Pressure

For applicable OMT configurations with a drain line:

• Continuous return pressure: 140 bar
• Intermittent: 175 bar
• Peak: 210 bar

Closed-loop and high-temperature applications require particular attention to shaft-seal pressure.

7. Calculate External Shaft Loads

For direct drives using:

• Sprockets
• Gears
• Pulleys
• Wheels

calculate:

Radial Load + Load Distance + Shaft Speed + Bearing Life

Danfoss provides permissible shaft-load curves and calculation guidance for OMT.

8. Respect Intermittent and Peak Duty

Danfoss defines:

Intermittent operation = maximum 10% of every minute

Peak load = maximum 1% of every minute

Intermittent and peak pressure/torque values must therefore not be treated as continuous operating ratings.

9. Perform 100% Simulated Operating-Condition Testing

For replacement Danfoss orbital motors, recommended factory QA includes:

• Displacement verification
• Continuous pressure testing
• Intermittent pressure testing
• Flow testing
• Speed verification
• Starting-torque testing
• Continuous-torque testing
• Internal-leakage testing
• Rotation-direction testing
• Shaft runout inspection
• Shaft/key/spline inspection
• Bearing inspection
• Return-pressure testing
• Temperature-rise testing
• Noise and vibration testing
• Complete configuration verification

For 151B3020, validation should follow the OMT 250 function diagram and configuration data.

For 151-0246, use the original OMR 315 historical configuration documentation.

For 11186712, use the exact Danfoss OMP X 315 configuration code for dimensional and functional verification.