variable-displacement axial piston pump

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4 year

Product details

Danfoss Series 90

Positioning: Closed-circuit, variable-displacement axial piston pump, featuring high power density, long service life, and bidirectional operation capabilities. Widely used in hydrostatic drives for mobile machinery.

90R042、90R055、90R075、90R100、90R130、90R180、90R250、90L045、90L055、90L075、90L100、90L130、90L180、90L250

90-R-055-SC

90-R-055-KP

90-R-055-KA

90-R-055-KN

90-R-055-KT

90-R-055-DD

90-R-055-MB

90-R-055-MA

90-R-055-HS

90-R-055-M8

90-R-075-MA

90-R-075-KP

90-R-075-DD

90-R-075-LY

90-R-075-MB

90-R-075-HS

90-R-075-MH

90-R-075-L1

90-R-075-HF

90-R-075-PJ

90-R-100-A5

90-R-100-HF

90-R-100-HS

90-R-100-LY

90-R-100-KA

90-R-100-KP

90-R-100-DD

90-R-100-PJ

90-R-100-L3

90-R-100-MA

90-L-055-KA

90-L-055-KP

90-L-055-HF

90-L-055-MA

90-L-055-MB

90-L-055-DD

90-L-055-M8

90-L-055-HS

90-L-075-KP

90-L-075-KN

90-L-075-HS

90-L-075-HF

90-L-075-L2

90-L-075-LY

90-L-075-MA

90-L-075-PB

90-L-075-PJ

90-L-075-K9

90-L-100-KN

90-L-100-KP

90-L-100-KA

90-L-100-HS

90-L-100-HF

90-L-100-FD

90-L-100-DD

90-L-100-PJ

90-L-100-LW

90-L-100-DC

90-L-100-MA

Danfoss Series 90 Variable-Displacement Axial Piston Pump

Full Name: Danfoss Series 90 Swash-Plate Variable Displacement Axial Piston Pump (Formerly Sauer-Danfoss)

As the core primary pump for closed-circuit hydrostatic transmission systems, this product has been widely applied in construction machinery for over 30 years. Renowned for high reliability, superior power density and modular design, it has become a benchmark for mobile hydraulic drive systems.

1. Core Operating Principle

It adopts a parallel axial piston-slipper assembly with a variable swash plate structure:

1. The main shaft drives the cylinder block and pistons to rotate synchronously, with pistons closely attached to the swash plate.

2. Adjusting the tilt angle of the swash plate directly changes the effective stroke of pistons, enabling stepless displacement regulation.

3. Bidirectional tilting of the swash plate reverses fluid flow direction, allowing direct forward and reverse rotation of the motor without additional directional valves.

4. An integrated charge pump provides make-up oil for the closed circuit, system cooling and pilot pressure for servo control.

2. Standard Models & Displacement Specifications

Seven standard displacement sizes are available in clockwise (90R) and counterclockwise (90L) rotations:

Model Nominal Displacement (cc/rev) Max Operating Pressure Rated Speed

90-030 30 450 bar 4200 rpm

90-042 42 450 bar 4000 rpm

90-055 55 450 bar 3900 rpm

90-075 75 450 bar 3600 rpm

90-100 100 450 bar 3300 rpm

90-130 130 450 bar 3100 rpm

90-180/250 180/250 450 bar 2600/2300 rpm

Instant peak pressure can reach 480 bar, offering extremely high system pressure resistance.

3. Key Structural Features

1. Integrated Built-in Charge Pump: Standard low-pressure charge unit with integrated charge relief valve, high-pressure overload valves and check valves, simplifying circuit design.

2. Rear Mount Flange for Tandem Pumps: Reserved interface for mounting auxiliary gear pumps or piston pumps to realize multi-hydraulic system integration.

3. Modular Control Valves: Valves can be replaced directly without disassembling the pump body for easy modification and maintenance.

4. PLUS+1™ Electronic Control Compatibility: Supports Danfoss bus control systems for intelligent electronic control of construction machinery.

4. Available Control Options for Full Series

- Mechanical Displacement Control (MDC): Manual lever or linkage control for purely mechanical drive systems.

- Hydraulic Displacement Control (HDC): External pilot hydraulic control compatible with hydraulic joysticks.

- Electronic Proportional Displacement Control (EDC): 0–5 V / 0–10 V analog electronic control for precise closed-loop speed regulation.

- Neutral Start Switch (NSS): Zero-displacement neutral protection enables no-load startup to protect the engine.

5. Main Application Scenarios

Specially designed for closed-circuit hydrostatic traction drive:

- Agricultural Machinery: Combine harvesters, windrowers, forage harvesters, cotton pickers

- Road Construction Machinery: Asphalt pavers, road rollers, cold planers, horizontal directional drills

- Forestry & Mining Machinery: Log loaders, underground mining vehicles

- Special Vehicles: Aerial work platforms, road sweepers, special tracked equipment

6. Product Advantages

1. Compact size and high power density significantly reduce installation space.

2. Mature mass production over 30 years ensures low failure rate with comprehensive global after-sales support.

3. Bidirectional flow output simplifies the system and reduces piping and valve components.

4. Compatible with high-viscosity hydraulic oils for low-temperature, dusty and other harsh operating conditions.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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Main Product: hydraulic motor, gear box , hydraulic pump, hydraulic valve , hydraulic winch, hydraulic system

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