90M075NC0N8N0C6W00NNN0000F0 Sauer Danfoss Hydraulic Piston Motor

Product Overview

The 90M075NC0N8N0C6W00NNN0000F0 and 90M100NC0N8N0S1W00NNN000020 are Sauer Danfoss Series 90M fixed-displacement axial piston motors, high-pressure core actuators for closed-circuit hydrostatic transmission systems. The 90M series features a parallel axial piston/slipper design with a fixed swashplate, covering displacements from 55 to 130 cm³/rev with a maximum working pressure of 450 bar, offering compact structure, light weight, and proven reliability.

The 90M075NC0N8N0C6W00NNN0000F0 corresponds to the 75 cm³/rev displacement size, while the 90M100NC0N8N0S1W00NNN000020 corresponds to 100 cm³/rev. Both motors are bidirectional, capable of intake or discharge through either port, suitable for closed-circuit hydrostatic transmissions requiring forward/reverse switching. An optional loop flushing valve provides additional cooling and fluid cleaning for the working circuit.

Each unit is manufactured to exact Sauer Danfoss 90M series specifications, with mounting flange (SAE C / SAE D), drive shaft specifications, port locations, and interfaces fully dimensionally matched for drop-in interchangeability. Every motor undergoes 100% simulated load testing on our test bench, validating output torque, volumetric efficiency, and operational stability across the rated and peak pressure ranges before shipment.

Technical Specifications 

90M075NC0N8N0C6W00NNN0000F0 Core Specifications

• Model: 90M075NC0N8N0C6W00NNN0000F0

• Series: Sauer Danfoss 90M Series

• Motor Type: Fixed-displacement axial piston motor

• Geometric Displacement: 75 cm³/rev (4.57 in³/rev)

• Maximum Working Pressure: 450 bar (6,525 psi)

• Peak Pressure: 480 bar (6,960 psi)

• Rated Pressure: 350 bar

• Continuous Speed (at max. displacement): 3,600 rpm

• Theoretical Torque: 1.19 N·m/bar (730 lbf·in/1,000 psi)

• Mounting Flange: SAE C flange / cartridge mount

• Drive Shaft: Splined shaft

• Circuit Type: Closed circuit

• Rotation Direction: Bidirectional

• Weight (approx.): 26 kg (SAE flange mount)

90M100NC0N8N0S1W00NNN000020 Core Specifications

• Model: 90M100NC0N8N0S1W00NNN000020

• Series: Sauer Danfoss 90M Series

• Motor Type: Fixed-displacement axial piston motor

• Geometric Displacement: 100 cm³/rev (6.10 in³/rev)

• Maximum Working Pressure: 450 bar (6,525 psi)

• Peak Pressure: 480 bar (6,960 psi)

• Rated Pressure: 420 bar

• Continuous Speed (at max. displacement): 3,300 rpm

• Maximum Speed: 3,650 rpm

• Theoretical Torque: 1.59 N·m/bar (970 lbf·in/1,000 psi)

• Mounting Flange: SAE C flange

• Drive Shaft: Splined shaft

• Circuit Type: Closed circuit

• Rotation Direction: Bidirectional

• Weight (approx.): 34 kg (SAE flange mount)

Sauer Danfoss 90M Series Full Displacement Range

• 90M055: 55 cm³/rev, max working pressure 450 bar, continuous speed 3,900 rpm

• 90M075: 75 cm³/rev, max working pressure 450 bar, continuous speed 3,600 rpm

• 90M100: 100 cm³/rev, max working pressure 450 bar, continuous speed 3,300 rpm

• 90M130: 130 cm³/rev, max working pressure 450 bar, continuous speed 3,100 rpm

Data referenced from Danfoss PowerSource official technical documentation and Sauer Danfoss 90M series technical manual.

Key Technical Advantages

1. Parallel Axial Piston/Slipper Design with High Power Density

The 90M series utilizes a parallel axial piston/slipper design combined with a fixed swashplate. The piston slippers form a hydrodynamic oil film under high pressure, enabling low-friction operation. The fixed swashplate design delivers constant output speed at constant flow input without requiring a regulating mechanism, offering simple construction and high reliability for applications demanding precise transmission ratio accuracy. The 90M100 delivers a theoretical torque of 1.59 N·m/bar at 450 bar maximum working pressure, achieving a leading power density among comparable products.

2. 450 bar High-Pressure Capability for Closed-Circuit Applications

Both the 90M075 and 90M100 feature a maximum working pressure of 450 bar with peak pressure up to 480 bar, suitable for high-pressure closed-circuit hydrostatic transmission systems. The motors can intake or discharge through either port for bidirectional rotation, meeting the hydraulic drive requirements of vehicle forward/reverse or equipment forward/reverse operation. An optional loop flushing valve continuously provides cooling and filtration for the closed circuit, preventing oil overheating and contaminant accumulation.

3. Precision-Machined Piston Pairs with High Volumetric Efficiency

Piston-to-bore clearances are controlled to micron-level tolerances through precision lapping, maintaining high volumetric efficiency under rated conditions. The valve plate and cylinder block end faces are precision-machined to ensure stable oil film formation and sealing reliability under high-pressure conditions. The fixed swashplate surface receives specialized treatment to reduce slipper friction and wear rates, extending motor service life.

4. Compact Lightweight Design with Proven Reliability

The 90M075 SAE flange mount weighs approximately 26 kg, and the 90M100 approximately 34 kg, achieving compact installation dimensions and low weight while delivering 75–100 cm³/rev displacement. The lightweight design reduces unsprung mass on vehicles or equipment, contributing to improved fuel economy and handling performance. The motors utilize high-quality bearings and seals, validated through rigorous bench testing to meet long-life operation requirements in harsh conditions such as construction and agricultural machinery.

5. OEM Interchangeability and 100% Simulated Load Testing

The 90M075NC0N8N0C6W00NNN0000F0 and 90M100NC0N8N0S1W00NNN000020 feature mounting flange dimensions (SAE C), drive shaft specifications (splined shaft), inlet/outlet port positions, and interfaces fully matched to the original Sauer Danfoss motor, enabling direct replacement without piping or bracket modification. Every motor undergoes 100% simulated load testing on our test bench, validating output torque, volumetric efficiency, and sealing integrity across the 350 bar rated and 480 bar peak pressure ranges, ensuring first-time pass on commissioning.

Application Areas

The 90M075NC0N8N0C6W00NNN0000F0 and 90M100NC0N8N0S1W00NNN000020 are widely deployed in the following machinery and systems:

• Agricultural Machinery: Combine harvester hydrostatic travel drives (John Deere, Claas Dominator, New Holland CR, Case IH and other brand models), grape harvesters, windrowers

• Construction Equipment: Asphalt paver travel drives, road roller vibration and travel circuits (Bomag, Dynapac, Ammann and other brand models)

• Material Handling: Telescopic handler hydrostatic transmissions (Merlo and other brands), forestry forwarders (Timberjack) travel drives

• Concrete Mixer Trucks: Mixing drum hydraulic drive systems

• Specialty Equipment: Various mobile machinery requiring high-pressure closed-circuit hydrostatic transmission

Expert Maintenance Tips

Pre-Installation Checks:

• Verify motor rotation direction matches system requirements. The 90M series is bidirectional, allowing inlet/outlet port function interchange.

• Fill the motor housing with clean hydraulic oil (ISO VG46 recommended) before installation to prevent dry-start damage to piston pairs and valve plate.

• Check mounting flange fit with the drive end. SAE C flange bolts should be tightened to specified torque.

• Verify splined shaft fit with the drive-end spline sleeve. Clearances should meet standard requirements; do not force installation.

Hydraulic Fluid and Filtration:

• Use ISO VG46 anti-wear hydraulic oil with a cleanliness level of NAS Class 9 (ISO 18/15) or better.

• A loop flushing valve should be installed in the closed-circuit system to continuously provide cooling and filtration.

• Replace all hydraulic fluid after the first 100 hours, then every 2000 hours or annually.

Operational Monitoring:

• Continuous working pressure must not exceed 450 bar; short-term peak pressure must not exceed 480 bar.

• Case drain pressure should normally remain below 2 bar. Ensure the drain line is unobstructed.

• Motor housing temperature must not exceed 90°C. If exceeded, inspect the cooling system and circuit leakage.

• Every 1000 hours, check splined shaft wear and seal condition; replace if wear exceeds specifications.