Sauer Danfoss Series 90 Heavy-Duty Piston Pumps

The Sauer Danfoss Series 90 is widely regarded as the industry benchmark for high-performance axial piston pumps in closed-circuit systems. These pumps are specifically designed for hydrostatic transmissions in the most demanding mobile and industrial applications.

This product page highlights two primary heavy-duty configurations: the 90R130 (130cc) and the 90R180 (180cc). These specific models—90R130MA5NN80L3C8HC4GBA424224 and 90R180-KA-5-CD-80-S-M-C8-H-03-FAC-26-26-24—are engineered to deliver maximum power density and precise control. Featuring a swashplate design with variable displacement, these pumps allow for seamless speed and direction control of hydraulic motors, making them the preferred choice for heavy-duty transit mixers, large crawlers, and mining equipment.

Engineering & Performance Highlights

Choosing the exact OEM configuration ensures that your machine maintains its original torque and response characteristics.

90R130MA5NN80L3 (130cc): This unit features a 130cc displacement and is equipped with MA (Manual Displacement Control). This allows for mechanical-to-hydraulic control, often used in applications where manual operator precision is required.
90R180-KA-5-CD (180cc): As the larger displacement variant, the 180cc model provides massive flow and torque. The KA control signifies an advanced displacement control system, typically integrated with electrical or hydraulic pilot signals for automated or remote operation.
Closed-Circuit Efficiency: Both pumps include an integrated charge pump to replenish oil, maintain control pressure, and circulate cooling fluid, ensuring the closed-loop system operates at peak efficiency even under extreme pressure.
High-Pressure Durability: Rated for continuous operation at 420 bar and peak pressures up to 480 bar, these Series 90 pumps are built with heavy-duty bearings and reinforced housings to withstand severe shock loads.

90R180-KA-5-CD-80-S-M-C8-H-03-FAC-26-26-24, 80002029

90R130MA5NN80L3C8HC4GBA424224

90R250KP5CD80T4C8J03NNN424224

90R250KA5EG80S3C8K03NNN424224

Exact Technical Specifications Matrix

Specification	90R130MA5NN80L3C8HC4	90R180-KA-5-CD-80-S-M
Pump Displacement	130 cm³/rev	180 cm³/rev
Control Type	MA (Manual Displacement Control)	KA (Specific Elect./Hyd. Control)
Rotation Direction	Right-Hand (R)	Right-Hand (R)
Nominal Pressure	420 bar	420 bar
Peak Pressure	480 bar	480 bar
Max. Operating Speed	~3100 rpm	~2650 rpm
Application Circuit	Closed-Loop Hydrostatic Drive	Closed-Loop Hydrostatic Drive

Frequently Asked Questions (FAQs)

Q1: What does the “R” signify in the 90R130 and 90R180 model codes? The “R” stands for Right-hand (clockwise) rotation as viewed from the drive shaft end. It is critical to match the rotation of the pump with the output of your engine or PTO to prevent internal damage and ensure the pump primes correctly.

Q2: Can a 90R130 pump be used in an open-circuit hydraulic system? No. The Series 90 pumps, including the 90R130 and 90R180, are specifically designed for closed-circuit hydrostatic transmissions. They rely on an integrated charge pump and specific porting that is not compatible with standard open-circuit reservoir and valve setups.

Q3: What is the main difference between the MA and KA control options? The MA control is a Manual displacement control, usually operated by a lever or mechanical linkage. The KA control is a more complex control module often involving electrical solenoids or hydraulic pilots, allowing for electronic integration with a machine’s ECU or cabin joystick.

Q4: Are these Sauer Danfoss pumps compatible with the current Danfoss Power Solutions brand? Yes. Danfoss Power Solutions acquired Sauer-Danfoss. These Series 90 pumps are the exact same high-quality components, and the model codes remain interchangeable with current Danfoss production standards.

Q5: What maintenance is required for these Series 90 piston pumps? Regular maintenance involves changing the hydraulic fluid and the specific high-pressure closed-loop filters. Due to the tight tolerances in 420 bar systems, even minor contamination can lead to “slippage” or catastrophic failure of the cylinder block and swashplate.