Danfoss T90R100MADNN8AS Hydraulic piston pump

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Product details

Danfoss T90R100MADNN8AS – The Core of Efficient Hydrostatic Transmission

The Danfoss T90R100MADNN8AS is a heavy-duty variable displacement Hydraulic piston pump designed specifically for closed-circuit systems, and belongs to Danfoss's highly recognized T90 series. As a highly integrated hydraulic pump, it features a swashplate axial piston design with a displacement of 100 cc/rev, delivering smooth and responsive hydraulic power for a wide range of construction machinery, agricultural equipment, and specialty vehicles. It is the ideal choice for high-load, high-reliability hydraulic systems.

This Hydraulic piston pump combines a compact design with high power density, supporting bidirectional variable output for precise control of actuator speed and direction. This significantly enhances the efficiency and controllability of the entire hydraulic system. Its built-in charge pump, integrated valve block, and precision control components greatly simplify system plumbing, allowing a single hydraulic pump to realize complex closed-circuit transmission functions, effectively reducing overall machine energy consumption and maintenance costs.

Whether for demanding traction drives or work functions requiring infinitely variable speed, the Danfoss T90R100MADNN8AS Hydraulic piston pump – with its excellent volumetric efficiency, low noise characteristics, and long service life – ensures your hydraulic system operates reliably around the clock, continuously delivering robust power under heavy-duty conditions.

I. Brand & Series Overview

Danfoss (formerly Sauer-Danfoss) T90 series is an optimized axial piston variable pump upgraded from proven S90 platform, specially designed for closed-circuit hydrostatic transmission. It has only 3 displacement sizes (055/075/100), optimized for concrete mixer drum drive and heavy-duty agricultural machinery travel systems, featuring high power density, heavy shock resistance and excellent adaptability to harsh outdoor operating environments.

II. Full Model Code Decoding

T90R100

- T90: Exclusive closed-circuit piston pump series customized for mixers & agricultural equipment

- R: Right-hand rotation (clockwise) viewed from the input shaft end

- 100: Maximum theoretical displacement: 100 mL/r (cm³/rev), the largest size in T90 lineup

MADNN

- MA: MDC Mechanical Displacement Control (bidirectional lever servo control for stepless swashplate adjustment & reversible flow output)

- D: Standard high-pressure relief valve configuration with preset pressure limitation

- N: Standard charge pump displacement matched for 100cc main pump flow

- N: Bare pump structure without rear auxiliary tandem pump mounting pad

8AS

- 8: SAE standard splined input shaft, widely compatible with mixer reducer transmissions

- A: SAE standard mounting flange & port layout

- S: Nitrile rubber shaft seal for conventional mineral-based hydraulic oil applications

III. Core Performance Specifications

1. Displacement: Stepless variable from 0 to 100 cm³/rev

2. Speed Ratings

- Minimum stable speed: 500 r/min

- Rated continuous speed: 3000 r/min

- Short-term max speed: 3200 r/min

3. Pressure Ratings

- Continuous working pressure: 400 bar

- Intermittent peak pressure: 450 bar

- Ultimate shock pressure: Up to 480 bar

- Integrated charge system stable pressure: 20~28 bar

4. Net Weight: Approx. 68 kg

5. Volumetric Efficiency: ≥93% under full high-pressure load, low efficiency drop at elevated temperatures

6. Fluid & Temperature: Anti-wear mineral hydraulic oil recommended; operating temp: -20℃~+95℃, optimal viscosity: 16~100 cSt

7. Filtration Requirement: System filtration accuracy ≥10μm; extra inlet strainer required for dusty mixer working conditions

IV. Structural & Design Advantages

1. Swashplate variable design with parallel piston-slipper assembly; reversible flow enables direct motor rotation reversal

2. Built-in integrated charge pump for system replenishment, circuit cooling and servo control oil supply, simplifying external piping

3. Reliable MDC mechanical lever control, ideal for mixer manual speed regulation and agricultural machinery gear shifting

4. Ductile iron housing with outstanding vibration & deformation resistance for rough mixer road conditions

5. Modular valve manifold integrating high-pressure relief, charge regulation and bidirectional check valves for easy maintenance

6. Compatible with PLUS+1™ control system for optional sensor-based intelligent upgrade

V. Typical Application Fields

1. Primary use: Main drive pump for concrete mixer truck drums

2. Agricultural machinery: Closed hydrostatic travel systems for large combine harvesters & tractors

3. Special construction equipment: Closed-loop transmission for motor graders, road rollers and heavy sanitation vehicles

VI. Installation & Maintenance Guidelines

1. Keep input shaft misalignment ≤0.08mm; never force coupling alignment to prevent spline breakage and seal leakage

2. Maintain full housing oil filling all the time; bleed air thoroughly before restart after long shutdown to avoid cavitation

3. Keep charge pump inlet absolute pressure 0.7~3bar (min. 0.2bar for cold start)

4. Standard service interval: 2000 working hours; shorten to 1000 hours for heavy-duty mixers for oil & filter replacement

5. Max case drain pressure limited to 5bar; drain line must run directly to tank without backpressure

Product Overview

The Danfoss T90R100MADNN8AS is a high-performance swashplate axial piston hydraulic pump designed for demanding applications in industrial machinery, construction equipment, and heavy-duty systems. Its primary function is to provide stable and efficient power to hydraulic systems, meeting stringent requirements under complex operating conditions.

Technical Specifications and Performance Advantages

1. Displacement and Pressure

• Rated Displacement: 100 cc/rev, ensuring high flow output for rapid actuator movements in hydraulic systems.

• Continuous Operating Pressure: 35 MPa, with a peak pressure of 42 MPa to handle transient pressure surges under heavy loads.

• High Rotational Speed: Up to 2,800 rpm for efficient power transmission.

2. Efficiency and Reliability

• Volumetric Efficiency: Measured at 94.5%, minimizing energy loss and enhancing overall system efficiency.

• Pressure Pulsation: Reduced by 12%, ensuring smooth hydraulic system operation and extending component lifespan.

• Low Noise: Operating at just 77 dB, suitable for noise-sensitive environments.

3. Construction and Materials

• Cast Iron Housing: High impact resistance for harsh operating conditions.

• Imported Bearings: Lifespan of up to 8,000 hours, reducing maintenance frequency.

• Through-Shaft Drive: Supports tandem mounting of a second pump for dual-circuit designs, enhancing system flexibility.

Applications

The Danfoss T90R100MADNN8AS hydraulic piston pump is widely used in the following fields:

1. Construction Machinery

• Hydraulic systems for 5–8-ton wheel loaders, powering travel, steering, and work attachments.

• Vibration systems for road rollers, providing a stable high-pressure hydraulic source.

2. Industrial Equipment

• Hydraulic screw-down systems in metallurgical equipment, meeting high-precision, high-load demands.

• Steering gear systems in marine vessels, ensuring reliable operation in rough sea conditions.

3. Special Operating Conditions

• Hydraulic drive systems for mining machinery, adapting to extreme environments with dust and vibration.

• Main oil pumps for concrete pump trucks in construction machinery, ensuring stable continuous operation.

Core Role in Hydraulic Systems

As the power source of a hydraulic system, the Danfoss T90R100MADNN8AS hydraulic piston pump optimizes system performance through:

1. Efficient Energy Conversion: Transforming mechanical energy into hydraulic energy to power actuators (e.g., hydraulic cylinders, motors).

2. Stable Pressure Output: Precision swashplate design ensures minimal pressure fluctuations, improving system control accuracy.

3. Adaptability to Complex Conditions: Supports closed-circuit designs for travel drives while remaining compatible with open-circuit applications.

Selection and Procurement Recommendations

1. Selection Criteria

• Choose the model based on system pressure ratings and flow requirements. For example, compared to the Rexroth A11VO260 or Sauer 90R75, the T90R100 offers superior performance in high-pressure, high-speed scenarios.

• Verify the operating oil temperature range (-20°C to +95°C) to avoid performance degradation due to overheating.

2. Procurement Considerations

• Supplier Qualifications: Select authorized Danfoss distributors (e.g., Ningbo Hi-Tech Zone Huili Machinery Technology Co., Ltd.) to ensure genuine products and after-sales support.

• Acceptance Standards: Require suppliers to provide factory test reports and verify serial numbers against Danfoss’s official website.

• Warranty Period: Clearly define the warranty period (typically 18 months) in contracts to safeguard long-term usage.