T90R055MADNN8AS3DDD03 Danfoss Piston Pump 55cc 420bar

Model 1: T90R055MADNN8AS3DDD03MIX424220

Product Overview

The T90R055MADNN8AS3DDD03MIX424220 is a Danfoss T90 Series swashplate-type axial piston variable displacement pump. The T90 Series is Danfoss’s core product line for closed-circuit hydrostatic drive applications, specifically designed for concrete mixer trucks, agricultural machinery, construction equipment, and other mobile applications. Developed based on over 30 years of market application experience, the series offers three frame sizes—055, 075, and 100. The T90R055 delivers a maximum displacement of 55 cm³/rev.

This model features an R configuration (right-hand rotation) with MA manual displacement control. The MA control adjusts the swashplate angle via mechanical linkage or cable, enabling stepless displacement regulation—ideal for simplified systems that do not require electro-hydraulic proportional control. MIX424220 is the production batch and customization code.

As a direct OEM-equivalent replacement solution for the Danfoss T90 Series, this product offers complete in-situ interchangeability, strictly adhering to Danfoss’s original design specifications and mounting interface standards. Every unit undergoes 100% simulated duty-cycle testing, ensuring that key performance metrics—including volumetric efficiency, pressure-flow characteristics, and case drain flow at rated pressure and full displacement—meet or exceed original factory specifications.

Technical Specifications

• Model Number: T90R055MADNN8AS3DDD03MIX424220

• Brand Series: Danfoss T90 Series

• Pump Type: Swashplate Axial Piston Variable Displacement Pump (Closed Circuit)

• Frame Size: 055

• Maximum Displacement: 55 cm³/rev

• Maximum Working Pressure: 420 bar (6092 psi)

• Rated Speed: 3500 rpm

• Maximum Speed: 3700 rpm

• Minimum Speed: 500 rpm

• Theoretical Flow at Rated Speed: 215 L/min (57 US gal/min)

• Control Type: MA – Manual Displacement Control

• Rotation Direction: R – Right-hand (clockwise from shaft end)

• Mounting Type: SAE Flange Mounting (ISO 3019-1-127-4)

• Shaft Type: Splined (ANSI B92.1-1970, 23 teeth, 16/32 pitch)

• Charge Pump: Integral built-in charge pump

• Design Features: Parallel axial piston/slipper design, tiltable swashplate for variable displacement

• Hydraulic Fluid: Mineral Oil

• Recommended Filtration: Refer to Danfoss T90 Series Technical Manual

• Weight: Approx. 35–40 kg (configuration dependent)

Key Technical Advantages

1. Closed-Circuit Dedicated Design with High System Integration
The T90 Series is specifically designed for closed-circuit hydrostatic applications, featuring an integral built-in charge pump that provides system replenishing oil, cooling flow, and control pilot pressure. This design eliminates the need for an external charge pump, significantly simplifying system layout and reducing installation space requirements and system costs.

2. 420 bar Ultra-High Pressure Rating – Industry Leading
The T90 Series delivers a maximum working pressure of 420 bar (6092 psi) . This pressure rating is among the industry’s highest for closed-circuit piston pumps, enabling the pump to withstand extreme pressure shocks encountered in concrete mixer trucks, mining equipment, and other heavy-duty mobile applications, ensuring system reliability and safety.

3. MA Manual Displacement Control – Simple and Reliable
MA manual displacement control adjusts the swashplate angle via mechanical linkage or cable, enabling stepless displacement regulation from 0 to 55 cm³/rev. This control method does not rely on electronic controllers or proportional solenoids—offering simple construction, direct response, and exceptional reliability—making it particularly suitable for applications with minimal electronic control dependency or where ultimate reliability is paramount.

4. Parallel Axial Piston/Slipper Design – High Power Density
The T90 Series employs a parallel axial piston/slipper design with a tiltable swashplate to vary displacement. This design delivers exceptionally high power density within a compact footprint. The 055 frame size outputs substantial hydraulic power at 420 bar, providing ample power reserves for mobile equipment.

5. Bi-Directional Rotation Capability with PLUS+1™ Compatibility
The T90 Series supports both clockwise and counter-clockwise rotation, allowing flexible selection based on host machine layout. The series is also compatible with Danfoss PLUS+1™ compliant controls and sensors, facilitating integration with advanced electronic control systems.

Application Areas

• Concrete Mixer Trucks (Primary Application): The T90 Series is Danfoss’s dedicated hydrostatic drive solution for concrete mixer trucks, providing reliable hydraulic power for mixer drum rotation

• Agricultural Machinery: Combine harvesters, forage harvesters, windrowers

• Construction Equipment: Pavers, rollers, trenchers

• Material Handling Equipment: Forklifts, reach stackers

• Forestry Equipment: Feller bunchers, skidders

• Mining Equipment: Underground transport vehicles, loaders

Expert Maintenance Tips

1. Model Confirmation & Pre-Installation Inspection: Prior to installation, confirm the complete model code as T90R055MADNN8AS3DDD03MIX424220. This is a T90 055 frame size, right-hand rotation configuration. Verify that the SAE flange mounting specification (ISO 3019-1-127-4) and splined shaft type (ANSI B92.1-1970, 23 teeth, 16/32 pitch) match the host machine PTO interface. Manually rotate the shaft before installation to confirm smooth, obstruction-free rotation.

2. Closed-Circuit Air Purge & Charge: The T90 Series is a closed-circuit design—ensure thorough system air purge before first start-up. Air in the closed circuit can cause cavitation, noise, and performance degradation. After start-up, run at low speed with repeated direction changes to purge air from both high and low pressure circuits.

3. Fluid Cleanliness Control: Closed circuits have stringent fluid cleanliness requirements. Use hydraulic fluid meeting Danfoss specifications with filtration not低于 ISO 18/15. Complete system flushing is mandatory before initial start-up.

4. MA Manual Control Tuning: MA manual displacement control adjusts displacement via mechanical linkage or cable. Ensure the control cable has no excessive bends, no binding, and full stroke coverage from zero to maximum displacement. Confirm that pump output flow is zero at neutral (zero displacement) to prevent vehicle creep at idle.

5. Charge Pressure Verification: The T90 Series features an integral built-in charge pump. After first start-up, verify charge pressure is within specification range (typically 18–25 bar). Low charge pressure causes sluggish control response and inadequate piston/slipper lubrication; excessive charge pressure may cause system overheating.

6. Case Drain Port Positioning & Pressure Monitoring: Ensure the drain port is positioned higher than the pump body to prevent oil starvation in the pump chamber after shutdown. Case pressure must not exceed 1.5 bar (absolute) . Install a pressure gauge on the case drain line for real-time monitoring.

Model 2: T90R100MADNN8AS3D7F03MIX383820

Product Overview

The T90R100MADNN8AS3D7F03MIX383820 is a Danfoss T90 Series swashplate-type axial piston variable displacement pump. The T90 Series is Danfoss’s core product line for closed-circuit hydrostatic drive applications, specifically designed for concrete mixer trucks, agricultural machinery, construction equipment, and other mobile applications. Developed based on over 30 years of market application experience, the series offers three frame sizes—055, 075, and 100. The T90R100 delivers a maximum displacement of 100 cm³/rev.

This model features an R configuration (right-hand rotation) with MA manual displacement control. The MA control adjusts the swashplate angle via mechanical linkage or cable, enabling stepless displacement regulation. The 100 frame size is the largest displacement offering in the T90 Series, delivering the highest power output capability. MIX383820 is the production batch and customization code.

As a direct OEM-equivalent replacement solution for the Danfoss T90 Series, this product offers complete in-situ interchangeability, strictly adhering to Danfoss’s original design specifications and mounting interface standards. Every unit undergoes 100% simulated duty-cycle testing, ensuring that key performance metrics—including volumetric efficiency, pressure-flow characteristics, and case drain flow at rated pressure and full displacement—meet or exceed original factory specifications.

Technical Specifications (Bulleted List)

• Model Number: T90R100MADNN8AS3D7F03MIX383820

• Brand Series: Danfoss T90 Series

• Pump Type: Swashplate Axial Piston Variable Displacement Pump (Closed Circuit)

• Frame Size: 100

• Maximum Displacement: 100 cm³/rev

• Maximum Working Pressure: 420 bar (6092 psi)

• Rated Speed: 3000 rpm

• Maximum Speed: 3200 rpm

• Minimum Speed: 500 rpm

• Theoretical Flow at Rated Speed: 330 L/min (87 US gal/min)

• Control Type: MA – Manual Displacement Control

• Rotation Direction: R – Right-hand (clockwise from shaft end)

• Mounting Type: SAE Flange Mounting (ISO 3019-1-127-4)

• Shaft Type: Splined (ANSI B92.1-1970, 23 teeth, 16/32 pitch)

• Charge Pump: Integral built-in charge pump

• Design Features: Parallel axial piston/slipper design, tiltable swashplate for variable displacement

• Hydraulic Fluid: Mineral Oil

• Recommended Filtration: Refer to Danfoss T90 Series Technical Manual

• Weight: Approx. 70–75 kg

Key Technical Advantages

1. 100 cc Large Displacement – Maximum Power Output
The T90R100 is the largest displacement offering in the T90 Series at 100 cm³/rev. At 420 bar working pressure, theoretical flow at rated speed reaches 330 L/min. This displacement class makes it the ideal choice for hydrostatic drives in large mobile equipment, delivering abundant hydraulic power for heavy-duty concrete mixer trucks, large combine harvesters, and other demanding applications.

2. 420 bar Ultra-High Pressure Rating – Withstanding Extreme Conditions
The T90 Series delivers a maximum working pressure of 420 bar (6092 psi) . The 100 frame size maintains the same pressure rating as the 055 frame size while delivering significantly higher flow output, ensuring system safety and reliability under extreme operating conditions.

3. MA Manual Displacement Control – Simple and Reliable
MA manual displacement control adjusts the swashplate angle via mechanical linkage or cable, enabling stepless displacement regulation from 0 to 100 cm³/rev. This control method does not rely on electronic controllers—offering simple construction, direct response, and exceptional reliability—making it particularly suitable for applications with minimal electronic control dependency.

4. Parallel Axial Piston/Slipper Design – Compact High Power Density
The T90 Series employs a parallel axial piston/slipper design with a tiltable swashplate to vary displacement. The 100 frame size achieves exceptionally high power density within a compact footprint, making it particularly suitable for mobile equipment with constrained installation space.

5. Integral Charge Pump with Bi-Directional Rotation
The T90 Series features an integral built-in charge pump providing system replenishing oil, cooling flow, and control pilot pressure for the closed circuit. The pump also supports both clockwise and counter-clockwise rotation, allowing flexible selection based on host machine layout.

Application Areas

• Large Concrete Mixer Trucks (Primary Application): The T90 Series is Danfoss’s dedicated hydrostatic drive solution for concrete mixer trucks—the 100 frame size delivers robust power for heavy-duty mixer drum rotation

• Large Agricultural Machinery: Large combine harvesters, forage harvesters

• Construction Equipment: Large pavers, rollers

• Material Handling Equipment: Heavy forklifts, reach stackers

• Mining Equipment: Underground loaders, mining trucks

Expert Maintenance Tips

1. Model Confirmation & Pre-Installation Inspection: Prior to installation, confirm the complete model code as T90R100MADNN8AS3D7F03MIX383820. This is a T90 100 frame size, right-hand rotation configuration. The 100 frame size weighs approximately 70–75 kg—significantly heavier than the 055 frame size—ensure lifting equipment and mounting brackets have adequate load capacity. Verify that the SAE flange mounting specification (ISO 3019-1-127-4) and splined shaft type (ANSI B92.1-1970, 23 teeth, 16/32 pitch) match. Manually rotate the shaft before installation to confirm smooth, obstruction-free rotation.

2. Closed-Circuit Air Purge & Charge: The T90 Series is a closed-circuit design—ensure thorough system air purge before first start-up. The 100 frame size has larger displacement and consequently holds more air in the system—purge more thoroughly and patiently. After start-up, run at low speed with repeated direction changes to purge air from both high and low pressure circuits.

3. Fluid Cleanliness Control: Closed circuits have stringent fluid cleanliness requirements. The 100 frame size’s larger displacement means higher flow rates and more demanding lubrication requirements. Use hydraulic fluid meeting Danfoss specifications with filtration not低于 ISO 18/15. Complete system flushing is mandatory before initial start-up.

4. MA Manual Control Tuning: MA manual displacement control adjusts displacement via mechanical linkage or cable. The 100 frame size has higher swashplate actuation torque—ensure the control cable has adequate strength and rigidity, no excessive bends, no binding, and full stroke coverage from zero to maximum displacement. Confirm that pump output flow is zero at neutral (zero displacement).

5. Charge Pressure Verification: The T90 Series features an integral built-in charge pump. The 100 frame size charge pump delivers higher flow than the 055 frame size. After first start-up, verify charge pressure is within specification range (typically 18–25 bar). Investigate promptly if charge pressure is abnormal.

6. Case Drain Port Positioning & Pressure Monitoring: Ensure the drain port is positioned higher than the pump body to prevent oil starvation in the pump chamber after shutdown. Case pressure must not exceed 1.5 bar (absolute) . The 100 frame size has higher case drain flow—ensure the drain line has adequate diameter to avoid excessive back pressure.