AT455737 83040488 Danfoss Series 45 Pump 90cc 310bar

Product Overview

The AT28045 / AT455737 / 83040488 / AT302661 / AT457670 / AT444574 / AT280243 corresponds to Danfoss Series 45 open-circuit variable displacement axial piston pumps commonly used in John Deere motor graders (such as 670G, 770G, 870G). It offers true drop-in interchangeability with original OEM units—standard mounting flanges and ports—so no piping modifications are required. Every unit is 100% tested under simulated operating conditions to guarantee reliable performance in open high-pressure systems. Supporting pressure-compensated and load-sensing controls, it provides adjustable flow and high power density for demanding mobile applications.

Technical Specifications 

• Model: AT455737 / 83040488 (Danfoss Series 45)
• Displacement: approx. 90 cm³/rev (typical)
• Continuous pressure: up to 310 bar
• Peak pressure: up to 400 bar (depending on frame)
• Maximum speed: up to 3600 rpm (depending on displacement)
• Control type: Pressure compensated / load sensing and others
• Weight: approximately 30–65 kg (depending on configuration)
• Circuit compatibility: Open
• Compatible machines: John Deere motor graders and similar

Key Technical Advantages

1. Precision swashplate and rotating group: High volumetric efficiency with low internal leakage for excellent system energy efficiency.
2. Multiple control options: Supports pressure compensation, load sensing, and power limiting for flexible matching to operating conditions.
3. High power density and compact design: Suitable for installation in mobile equipment engine compartments.
4. Drop-in interchangeability and OEM compatibility: Direct replacement for John Deere original pumps, minimizing downtime.
5. Long-life bearings and reliable sealing: Designed for continuous high-pressure operation in harsh environments.

Application Areas

• John Deere 670G/770G/870G motor graders
• Main hydraulic pumps on other construction and agricultural mobile equipment
• High-pressure open-circuit systems
• Machinery requiring variable flow and efficient control

Expert Maintenance Tips

Ensure suction lines are adequately sized; route case drain independently. Fully bleed the system before first start-up and maintain high fluid cleanliness. Use recommended viscosity hydraulic oil and inspect filters and oil temperature regularly. Lock control settings after adjustment. For long-term storage, fill with clean oil and seal all ports.