90M055 Danfoss Hydraulic Motor 55cc 450bar 3900rpm

Product Overview

The 90M series is a key member of the Danfoss Sauer Series 90 axial piston motor family. Featuring a parallel axial piston/slipper design with a fixed swashplate, the Series 90 motors are available in four displacements ranging from 55 cm³ to 130 cm³. The 90M series represents the fixed displacement motor variants, commonly used in combination with Series 90 variable pumps (such as the 90R series) for closed-circuit hydrostatic transmissions, travel drives, fan drives, and industrial applications.

90M series motors offer bidirectional rotation capability and can intake or discharge fluid through either port. Optional loop flushing valves provide additional cooling and cleaning for the working circuit.

Our product provides a fully interchangeable direct replacement for the original Danfoss Sauer 90M series motor, with identical mounting dimensions, port specifications, and shaft configurations. Every unit undergoes 100% simulated duty-cycle testing—performance-validated under rated pressure, peak pressure, and full speed range to ensure volumetric efficiency, mechanical efficiency, torque output, noise levels, and thermal characteristics meet or exceed original OEM specifications.

Model 1: 90M055

Technical Specifications 

• Model: 90M055

• Displacement: 55 cm³/rev

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

• Peak Pressure: 480 bar (6,960 psi)

• Max. Continuous Speed (@ max. displacement): 3,900 rpm

• Max. Speed (@ max. displacement): 4,250 rpm

• Rated Flow (@ rated speed): 215 L/min

• Max. Flow (@ max. speed): 234 L/min

• Theoretical Torque: 0.88 Nm/bar (530 lbf-in/1,000 psi)

• Direction of Rotation: Bidirectional

• Circuit Type: Closed circuit

• Mounting: SAE C flange or cartridge

• Port Connections: Dual axial ports

• Loop Flushing Valve: Optional

• Weight: SAE approx. 22 kg, cartridge approx. 26 kg

Key Technical Advantages

1. Parallel Axial Piston/Slipper Design
The proven parallel axial piston and slipper design with a fixed swashplate delivers efficient and reliable power transmission. Volumetric efficiency reaches 95% or higher.

2. Ultra-High Pressure Capability
With maximum working pressure of 450 bar and peak pressure of 480 bar, the 90M055 delivers exceptional power density. Maximum corner power reaches 187 kW (251 hp).

3. Bidirectional Rotation & Closed-Circuit Compatibility
Supports bidirectional rotation with fluid intake/discharge through either port. Optional loop flushing valve provides cooling and cleaning.

4. Low-Noise Design
Operating noise ≤ 70 dB(A), meeting industrial standards. Lifetime-lubricated bearings reduce maintenance costs.

5. Modular Mounting Configurations
Available in SAE C flange and cartridge mounting options, with splined, tapered, or straight shaft options.

Application Areas

• Agricultural machinery (harvesters, combines, windrowers)

• Construction equipment (pavers, rollers, trenchers)

• Material handling equipment

• Forestry machinery

• Turf care equipment

• Mining equipment

• Specialty vehicles (fire ladder trucks, snowmobile travel systems)

Expert Maintenance Tips

1. Shaft seals and all O-rings must be replaced after every disassembly.

2. Pre-lubricate all moving parts with clean hydraulic fluid before assembly.

3. Monitor case drain flow regularly—an abnormal increase indicates potential piston or slipper wear.

4. Inspect bearing wear every 500 hours of operation.

5. Prime the motor housing with hydraulic oil before initial start-up.

6. Ensure hydraulic system filtration meets β₁₀ ≥ 75.

Model 2: 90M075

Product Overview

The 90M075 is the 75 cm³ displacement model in the Danfoss Sauer Series 90 axial piston motor family. Positioned in the middle of the four 90M series sizes, this model combines high-speed capability (3,600 rpm) with ample torque output (1.19 Nm/bar)—making it one of the most versatile and widely used models in the 90M series.

Our product provides a fully interchangeable direct replacement for the original Danfoss Sauer 90M075 series motor. Each unit undergoes 100% simulated duty-cycle testing—performance-verified at rated and peak pressures.

Technical Specifications 

• Model: 90M075

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

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

• Peak Pressure: 480 bar (6,960 psi)

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

• Max. Speed (@ max. displacement): 3,950 rpm

• Rated Flow (@ rated speed): 270 L/min

• Max. Flow (@ max. speed): 296 L/min

• Theoretical Torque: 1.19 Nm/bar (730 lbf-in/1,000 psi)

• Direction of Rotation: Bidirectional

• Circuit Type: Closed circuit

• Mounting: SAE C flange or cartridge

• Port Connections: Dual axial ports

• Loop Flushing Valve: Optional

• Weight: SAE approx. 26 kg, cartridge approx. 33 kg

Key Technical Advantages

1. Optimized Displacement-Power Balance
With 75 cm³ displacement, the 90M075 strikes an ideal balance between high-speed capability (3,600 rpm) and torque output (1.19 Nm/bar)—the most versatile model in the 90M series.

2. Parallel Axial Piston/Slipper Design
Proven design delivers high efficiency and reliability. Volumetric efficiency reaches 95% or higher.

3. Ultra-High Pressure Capability
Maximum working pressure of 450 bar, peak pressure of 480 bar. Maximum corner power reaches 187 kW (251 hp).

4. Low-Noise & Long-Life Design
Operating noise ≤ 70 dB(A). Lifetime-lubricated bearings reduce maintenance costs.

5. Modular Mounting Configurations
Available in SAE C flange and cartridge mounting options.

Application Areas

• Agricultural machinery (harvesters, combines, windrowers)

• Construction equipment (pavers, rollers, trenchers)

• Material handling equipment

• Forestry machinery

• Turf care equipment

• Mining equipment

Expert Maintenance Tips

1. Shaft seals and all O-rings must be replaced after every service.

2. Lubricate all moving parts with clean hydraulic fluid before assembly.

3. Monitor case drain flow—a significant increase indicates piston or slipper wear.

4. Inspect bearing wear every 500 hours of operation.

5. Ensure hydraulic system filtration meets β₁₀ ≥ 75.

Model 3: 90M100

Product Overview

The 90M100 is a large-displacement model in the Danfoss Sauer Series 90 axial piston motor family, with 100 cm³/rev displacement. This model delivers significantly higher torque output (1.59 Nm/bar), making it ideal for medium-to-heavy duty applications such as large combines, heavy rollers, and industrial drives.

Our product provides a fully interchangeable direct replacement for the original Danfoss Sauer 90M100 series motor. Each unit undergoes 100% simulated duty-cycle testing—full-performance validation at rated and peak pressures.

Technical Specifications 

• Model: 90M100

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

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

• Peak Pressure: 480 bar (6,960 psi)

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

• Max. Speed (@ max. displacement): 3,650 rpm

• Rated Flow (@ rated speed): 330 L/min

• Max. Flow (@ max. speed): 365 L/min

• Theoretical Torque: 1.59 Nm/bar (970 lbf-in/1,000 psi)

• Direction of Rotation: Bidirectional

• Circuit Type: Closed circuit

• Mounting: SAE C flange

• Port Connections: Dual ports

• Loop Flushing Valve: Optional

• Weight: Approx. 34 kg

Key Technical Advantages

1. High Torque Output
With 100 cm³ displacement delivering 1.59 Nm/bar theoretical torque—approximately 34% higher than the 90M075 (1.19 Nm/bar). Combined with 450 bar working pressure, this provides powerful driving capability.

2. Parallel Axial Piston/Slipper Design
Proven design delivers high efficiency and reliability.

3. Ultra-High Pressure Capability
Maximum working pressure of 450 bar, peak pressure of 480 bar. Maximum corner power reaches 292 kW (392 hp).

4. Low-Noise Design
Operating noise ≤ 70 dB(A).

Application Areas

• Large agricultural machinery (harvesters, combines, windrowers)

• Heavy construction equipment (heavy rollers, pavers)

• Material handling equipment

• Forestry machinery

• Mining equipment

Expert Maintenance Tips

1. Shaft seals and all O-rings must be replaced after every disassembly.

2. Thoroughly lubricate all components with clean hydraulic fluid before assembly.

3. Regularly check case drain flow—an abnormal increase indicates internal wear.

4. Inspect bearing wear every 500 hours of operation.

5. Ensure hydraulic system filtration meets β₁₀ ≥ 75.

6. Prime the motor housing with hydraulic oil before initial start-up.

Model 4: 90M130

Product Overview

The 90M130 is the largest displacement model in the Danfoss Sauer Series 90 axial piston motor family, with 130 cm³/rev displacement. As the “flagship” specification of the 90M series, it delivers the highest theoretical torque output of 2.07 Nm/bar, specifically designed for demanding applications in heavy construction, large-scale agriculture, and industrial heavy-duty drives.

Our product provides a fully interchangeable direct replacement for the original Danfoss Sauer 90M130 series motor. Every unit undergoes 100% simulated duty-cycle testing—full-performance validation at rated pressure (450 bar) and peak pressure (480 bar).

Technical Specifications 

• Model: 90M130

• Displacement: 130 cm³/rev (7.90 in³/rev)

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

• Peak Pressure: 480 bar (6,960 psi)

• Max. Continuous Speed (@ max. displacement): 3,100 rpm

• Max. Speed (@ max. displacement): 3,400 rpm

• Rated Flow (@ rated speed): 403 L/min

• Max. Flow (@ max. speed): 442 L/min

• Theoretical Torque: 2.07 Nm/bar (1,260 lbf-in/1,000 psi)

• Direction of Rotation: Bidirectional

• Circuit Type: Closed circuit

• Mounting: SAE D flange

• Port Connections: Dual ports

• Loop Flushing Valve: Optional

• Weight: Approx. 45 kg

Key Technical Advantages

1. Maximum Displacement, Highest Torque Output
With 130 cm³/rev delivering 2.07 Nm/bar theoretical torque—the highest in the 90M series. Combined with 450 bar working pressure, this delivers exceptionally powerful driving capability—maximum corner power reaches 354 kW (475 hp).

2. Parallel Axial Piston/Slipper Design
Proven design delivers high efficiency and reliability.

3. Ultra-High Pressure Capability
Maximum working pressure of 450 bar, peak pressure of 480 bar.

4. SAE D Standard Mounting
SAE D 4-bolt flange mounting conforms to international standards for easy integration into heavy equipment systems.

5. Low-Noise Design
Operating noise ≤ 70 dB(A)—low noise levels compared to competing products in its class.

Application Areas

• Large agricultural machinery (large combine harvesters)

• Heavy construction equipment (large rollers, pavers)

• Mining equipment

• Forestry machinery (large logging equipment)

• Material handling and port machinery

• Specialty vehicle travel systems

Expert Maintenance Tips

1. Shaft seals and all O-rings must be replaced after every disassembly.

2. Thoroughly lubricate all components with clean hydraulic fluid before assembly.

3. Regularly check case drain flow—an abnormal increase indicates internal wear.

4. Weight is approx. 45 kg—use proper lifting equipment during installation and removal to prevent personal injury or component damage.

5. Inspect bearing wear every 500 hours of operation.

6. Ensure hydraulic system filtration meets β₁₀ ≥ 75 to protect precision components.

7. Prime the motor housing with hydraulic oil before initial start-up.