Sauer Danfoss Series 90 Variable Piston Pump

The Sauer Danfoss Series 90 is a family of highly advanced, variable displacement axial piston pumps with a swashplate design, engineered exclusively for closed-circuit hydrostatic transmissions. Renowned for their incredible power density and rugged reliability, these pumps form the core drive system for heavy-duty mobile machinery. The specific model 90L100KA5NN80S3C7E03 features a 100 cm³/rev displacement and left-hand (CCW) rotation, equipped with an integrated charge pump and high-pressure relief valves to provide smooth, precise, and infinitely variable speed control.

Key Features:

Brand: Sauer Danfoss (Danfoss Power Solutions)
Series: Series 90 (90L = Left Rotation, 90R = Right Rotation)
Displacement: 100 cc/rev (Size 100)
Max. Pressure: 420 bar (Nominal) / 480 bar (Peak)
Application: Closed Circuit Hydrostatic Drives.

Product Overview The Sauer Danfoss 90 Series Variable Pump sets the industry standard for closed-loop hydraulic power. By varying the angle of the swashplate, the pump can infinitely control the flow rate and reverse the fluid direction without the need for directional control valves. This provides seamless, continuous control of a hydraulic motor’s speed and direction, making it the ultimate solution for vehicle propulsion and heavy rotating implements.

Why Choose the Sauer Danfoss Series 90?

Compact & Power-Dense: Extremely high power-to-weight ratio allows for flexible installation in tight engine compartments.
Integrated Charge Pump: Includes a built-in charge (boost) pump that replenishes closed-circuit fluid, provides control pressure, and circulates cooling oil through the system.
Versatile Control Options: Available with a wide array of control systems, including Manual Displacement Control (MDC), Electrical Displacement Control (EDC), and Hydraulic Displacement Control (HDC), adapting to any machine interface.
Exceptional Durability: Features a robust cast-iron housing and heavy-duty bearings capable of withstanding the harsh vibrations and pressure spikes common in off-highway applications.

Common Applications:

Construction: Transit concrete mixers, road rollers, skid steer loaders, and excavators.
Agriculture: Combine harvesters, self-propelled sprayers, heavy tractors.
Forestry & Mining: Feller bunchers, underground loaders, and drilling rigs.
Material Handling: Large forklifts and straddle carriers.

Specification	Value / Description
Product Type	Variable Displacement Axial Piston Pump
Circuit Type	Closed Circuit
Series	Sauer Danfoss Series 90
Displacement ( $V_{g max}$ )	100 cm³/rev (Other sizes available: 42, 55, 75, 130, 180, 250)
Nominal Pressure	420 bar (6090 psi)
Peak Pressure	480 bar (6960 psi)
Max. Operating Speed	~3300 rpm (for size 100)
Model Breakdown	90 L 100 KA 5 NN 80 S3 C7 E03
– 90	Series 90 Variable Pump
– L	Direction of Rotation: Left-hand (Counter-Clockwise)
– 100	Displacement Size: 100 cc/rev
– KA	Control Type: Specific control configuration (e.g., specific voltage EDC or non-linear manual control)
– 5 NN	Displacement Limiters & Auxiliary Mounting options (NN = None/Standard)
– 80	Porting Configuration
– S3	Shaft Type: Splined Shaft (SAE standard)
– C7	Charge Pump Size / Displacement
– E03	High-Pressure Relief Valve Setting (e.g., specific pressure bar setting)