90R100 90R130 90R Series Piston Pump | 480 bar | Danfoss

Product Overview

The 90R series swashplate axial piston variable pumps represent a classic product line within the Danfoss (formerly Sauer-Danfoss) closed-circuit hydraulic transmission platform, featuring the proven cradle swash plate design specifically developed for closed-circuit hydrostatic drive systems. The series offers eight displacement sizes from 30 to 250 cm³, covering applications from compact to heavy-duty mobile equipment. This product covers two mainstream displacement models — 90R100 and 90R130.

Specific models include:

• 90R100 HF5NN60 L4C7 E00 FAD262620 F001 — 100 cm³ displacement with HF control (hydraulic pilot proportional control)

• 90R130 EA 1NN80S3C8 N03 GBA 161620 — 130 cm³ displacement

Product Positioning: The 90R series is the core product of the Danfoss Series 90 platform, featuring cradle swash plate design. Flow rate is proportional to pump input speed and displacement, with displacement infinitely adjustable between zero and maximum. Flow direction is reversed by tilting the swash plate to the opposite side of the neutral position. With over three decades of production and millions of units manufactured globally, this is one of the most mature and reliable product platforms in closed-circuit hydrostatic transmission.

100% Interchangeability Guarantee: Our pumps strictly adhere to Danfoss Series 90 original mounting dimensions and port layouts, utilizing SAE J518 split-flange connections (Code 62 standard) and ISO 3019-1 mounting flanges. They enable drop-in replacement without modifications to existing piping or brackets. Every unit undergoes 100% simulated duty-cycle testing under actual load conditions to validate performance parameters before shipment, ensuring immediate reliability upon installation.

Quality & Manufacturing Standards: The housing is manufactured from high-strength cast iron, with critical tribological pairs (cylinder barrel/valve plate, pistons/slippers) precision-ground and heat-treated. The 9-piston design with slipper pads sliding on the swash plate delivers smooth flow regulation from zero to maximum in both directions. Modular construction ensures service-friendly maintenance.

Technical Specifications 

Series General Specifications (Series 90 Platform):

• Design: Cradle swash plate axial piston variable pump

• Circuit Type: Closed circuit (hydrostatic transmission)

• Rated Working Pressure: 450 bar (6,525 psi)

• Peak Pressure: 480 bar (6,960 psi)

• Displacement Range: 30 – 250 cm³/rev (8 sizes)

• Minimum Speed: 500 min⁻¹

• Control Options: Multiple (CA, DC, DD, KA, KP, HF, MA, MB, etc.)

• Mounting Flange: Per ISO 3019-1

• Main Ports: 4-bolt split-flange per SAE J518 Code 62

• Port Configuration: Twin or side port

• Case Drain Ports: SAE O-ring boss

• Drive Shaft: Splined

90R100 (90R100 HF5NN60 L4C7 E00 FAD262620 F001):

• Series: Danfoss Series 90

• Displacement: 100.0 cm³/rev (6.10 in³/rev)

• Rated Working Pressure: 450 bar (6,525 psi)

• Peak Pressure: 480 bar (6,960 psi)

• Rated Speed: 3,300 min⁻¹

• Maximum Speed: 3,650 min⁻¹

• Maximum Attainable Speed: 4,000 min⁻¹

• Minimum Speed: 500 min⁻¹

• Theoretical Flow @ Rated Speed: 330 L/min (87 US gal/min)

• Theoretical Torque @ Max Displacement: 1.59 N·m/bar (970 lbf·in/1000 psi)

• Moment of Inertia (Rotating Components): 0.0150 kg·m²

• Mounting Flange: SAE-C 4-bolt (ISO 3019-1 Flange 127-4)

• Main Port Size: 25.4 mm (1.0 in)

• Drive Shaft: Splined ANSI B92.1 (z23 16/32dp)

• Weight (with MA Control): Approx. 68 kg (150 lb)

• Control Type: HF (Hydraulic Pilot Proportional Control)

90R130 (90R130 EA 1NN80S3C8 N03 GBA 161620):

• Series: Danfoss Series 90

• Displacement: 130.0 cm³/rev (7.93 in³/rev)

• Rated Working Pressure: 450 bar (6,525 psi)

• Peak Pressure: 480 bar (6,960 psi)

• Rated Speed: 3,100 min⁻¹

• Maximum Speed: 3,400 min⁻¹

• Maximum Attainable Speed: 3,700 min⁻¹

• Minimum Speed: 500 min⁻¹

• Theoretical Flow @ Rated Speed: 403 L/min (106 US gal/min)

• Theoretical Torque @ Max Displacement: 2.07 N·m/bar (1,260 lbf·in/1000 psi)

• Moment of Inertia (Rotating Components): 0.023 kg·m²

• Mounting Flange: SAE-D 4-bolt (ISO 3019-1 Flange 152-4)

• Main Port Size: 31.75 mm (1.25 in)

• Weight (with MA Control): Approx. 88 kg (195 lb)

Key Technical Advantages

1. Cradle Swash Plate Design — Smooth and Efficient Flow Control
The 90R series features cradle swash plate design, enabling smooth flow reversal simply by tilting the swash plate past the neutral position. In traction drive applications, forward and reverse transitions are seamless without additional directional valves — eliminating shock and pressure surges associated with conventional switching.

2. 480 bar Peak Pressure — High-Pressure Benchmark in Closed Circuits
The entire series delivers 450 bar (6,525 psi) rated pressure and 480 bar (6,960 psi) peak pressure. This pressure rating enables the 90R series to handle everything from agricultural machinery to mining equipment — one of the highest-pressure universal variable pumps in closed-circuit hydrostatic transmissions.

3. 9-Piston Precision Design — Low Pulsation, High Smoothness
The 90R series features a 9-piston design with slipper pads sliding on the swash plate, delivering smooth flow regulation from zero to maximum displacement. The 9-piston configuration effectively reduces output flow pulsation amplitude — combined with precision-ground valve plates, this delivers low-noise, low-vibration operating characteristics.

4. Modular Construction — Service-Friendly, Easy Maintenance
The 90R series features modular construction, with each functional module independently replaceable. Control options (CA, DC, DD, KA, KP, HF, MA, MB, etc.) can be flexibly configured by swapping control modules. This design significantly reduces on-site maintenance difficulty and downtime.

5. Closed-Circuit Optimized Design — Integrated Charge and Cooling
The 90R series is purpose-engineered for closed-circuit applications, with an integrated charge pump and charge relief valve providing stable charge pressure and cooling flow. The closed-circuit design keeps oil circulating between pump and motor, eliminating oil-air contact found in open-circuit reservoirs — extending fluid service life and reducing contamination risk.

6. Extensive Optional Configurations and Through-Drive
The 90R series supports through-drive for mounting additional hydraulic pumps on the same input shaft. Optional features include integral suction filtration, mechanical stroke limiters, neutral position switches, and more. This extensive option set enables the 90R series to flexibly adapt to customized requirements of complex systems.

Application Areas

The 90R series swashplate axial piston variable pumps are widely deployed in closed-circuit hydrostatic drive systems across the following applications:

• Combine Harvesters — hydrostatic traction drives for Claas Lexion, New Holland CR, and Case IH Axial-Flow series

• Forestry Forwarders — traction drives for Ponsse, Timberjack, John Deere, and Valmet

• Road Sweepers — traction drives for Allianz/Johnston

• Concrete Mixers — drum hydraulic drives

• Construction Machinery — traction drive systems for excavators, loaders, bulldozers

• Agricultural Machinery — hydrostatic drives for large tractors

• Industrial Machinery — material handling equipment and industrial transmission applications

Expert Maintenance Tips

1. Housing Priming Before Installation (Critical Step)
As a closed-circuit pump, before initial start-up or after extended downtime, the housing must always be filled with hydraulic fluid. Pre-fill through case drain ports prior to start-up to prevent dry-running damage to critical tribological pairs (cylinder barrel/valve plate, pistons/slippers).

2. Charge Pressure Monitoring
The 90R series relies on the integrated charge pump for charge pressure and cooling flow in closed circuits. Continuously monitor charge pressure during operation. Charge pressure settings can be found on the pump nameplate. Insufficient charge pressure will result in sluggish control response, inadequate lubrication, and system overheating.

3. Filtration and Fluid Cleanliness
Closed-circuit piston pumps are highly sensitive to fluid cleanliness. Recommended filtration per ISO 4406 cleanliness level of 19/17/14 or better. Optional integral suction filters or charge pressure filters should be inspected and replaced regularly.

4. Control Type Verification
The 90R series offers multiple control options (CA, DC, DD, KA, KP, HF, MA, MB, etc.). Before installation and commissioning, verify that the control type code on the nameplate matches system requirements. The HF control featured in this product is hydraulic pilot proportional control — ensure pilot oil lines are correctly connected and leak-free.

5. Initial Start-Up and Break-In
For first-time operation, run the pump at low speed (idle) with no load for 5–10 minutes to purge air from the system and allow proper oil film establishment on all tribological pairs before gradually applying load.

6. Model Code Interpretation
The 90R series model code contains extensive product information: 【90R】indicates 90 series, clockwise rotation (R); 【100】indicates 100 cm³ displacement; 【HF5NN60】indicates control type and configuration; 【L4C7】indicates port and mounting configuration; 【E00】indicates design version; 【FAD262620】indicates material/part number; 【F001】indicates specific configuration code.