90R075DD1NN80P4S1 Danfoss Series 90 Variable Piston Pump 450bar

Product Overview

The 90R075DD1NN80P4S1DZ1GBA323224 together with the 90R/90L series (including 90R075, 90R100 and 90R180) are precision-engineered interchangeable axial piston variable-displacement pumps fully compatible with the Danfoss (Sauer-Danfoss) Series 90. Designed in swashplate configuration for closed-circuit hydrostatic transmissions, flow is proportional to drive speed and displacement and infinitely variable. These units integrate a charge pump, high-pressure relief valves and pressure-limiter system for high power density and reliability. They deliver 100% form-fit-function interchangeability with original Danfoss models. Every pump undergoes rigorous 100% simulated operating-condition testing to guarantee volumetric efficiency, boost performance and reliability under continuous rated conditions.

Technical Specifications 

• Models: 90R075DD1NN80P4S1DZ1GBA323224 (DD control); 90R075, 90L075, 90R100, 90L100, 90R180, 90L180
• Geometric displacement (max): 90R075/90L075 – 75 cm³/rev; 90R100/90L100 – 100 cm³/rev; 90R180/90L180 – 180 cm³/rev
• Maximum working pressure: 450 bar
• Maximum pressure: 480 bar
• Rated speed: 90R075 – 3600 rpm; 90R100 – 3300 rpm; 90R180 – 2600 rpm
• Maximum speed: 90R075 – 3950 rpm; 90R100 – 3650 rpm; 90R180 – 2850 rpm
• Minimum speed: 500 rpm
• Theoretical flow at rated speed: 90R075 approx. 270 L/min; 90R100 approx. 330 L/min; 90R180 approx. 468 L/min
• Control type: DD (3-position F-N-R solenoid control) and other electric, manual or hydraulic options
• Charge pressure range: 18–34 bar
• Housing material: High-strength cast iron
• Approximate weight (with MA control): 90R075 – 49 kg; 90R100 – 68 kg; 90R180 – 136 kg
• Circuit type: Closed circuit
• Direction of rotation: Right-hand (R) or left-hand (L) available

Key Technical Advantages

1. High power-density swashplate design enables infinitely variable displacement with excellent efficiency, ideal for compact closed-circuit hydrostatic transmissions.
2. Integrated charge pump, pressure limiter and high-pressure relief valves provide comprehensive overpressure protection and system replenishment, improving safety and thermal management.
3. Flexible control options including solenoid, electric displacement and manual controls deliver rapid response and precise flow/direction management.
4. Robust cast-iron housing combined with heavy-duty bearings and precision rotating group ensures high rigidity, vibration resistance and extended service life under continuous high-pressure duty.
5. Full dimensional and functional interchangeability with original Danfoss Series 90 units, including mounting, shaft, ports and controls, plus auxiliary mounting pads, allows true drop-in replacement and multi-pump configurations without system modifications.

Application Areas

Suitable for closed-circuit mobile hydrostatic transmissions including crawler excavator travel drives, bulldozers, loaders, harvesters, forestry machinery, port equipment, compactors and any application requiring bidirectional high-pressure variable flow with high power density.

Expert Maintenance Tips

Ensure precise shaft alignment and complete charge-circuit integrity during installation to prevent cavitation (maintain absolute pressure at charge inlet ≥ 0.7 bar). Confirm case drain is correctly routed to the reservoir within allowable back pressure before start-up. Use specified mineral-based hydraulic oil and maintain recommended cleanliness levels with regular filter changes. Set high-pressure values according to the system’s maximum working pressure. When using auxiliary drive, observe torque limits of the secondary pump. Periodically inspect the port plate, pistons and charge pump; replace serviceable wear components as needed to restore performance. Avoid prolonged over-pressure or overspeed operation.