John Deere Hydraulic Pump AT455737 AT428960 | AT302661 AT353758 | High Pressure

The John Deere High-Pressure Piston Pump Series from LIC Hydraulic is the definitive solution for heavy equipment maintenance. Covering critical part numbers such as AT455737, AT428960, and AT302661, these variable displacement pumps are engineered to restore the factory-level speed and breakout force to your loaders, excavators, and graders. We provide 100% drop-in replacements that match original OEM mounting footprints, spline shafts, and sophisticated hydraulic control logic.

Technical Highlights

• Part Numbers: AT455737, 83040488, AT428960, AT302661, AT353758, AT354782.

• System Type: Open-loop (Work hydraulics) or Closed-loop (Drive hydraulics).

• Max Pressure: Continuous duty up to $350\text{ bar}$ ($5075\text{ psi}$); Intermittent up to $400\text{ bar}$.

• Construction: Heavy-duty cast iron or reinforced aluminum housings with hardened rotating groups.

Core Advantages

• Optimized Power Density: These pumps offer maximum flow output in a compact frame, allowing John Deere equipment to maintain high performance without adding excessive weight to the chassis.

• Precision Control Integration: Fully compatible with JD’s advanced hydraulic control systems, including Load Sensing (LS) and Electronic Displacement Control (EDC), ensuring seamless machine response.

• Extreme Durability: Built to survive the high-frequency reversals and pressure spikes characteristic of backhoe and forestry duty cycles, minimizing unplanned downtime.

• Interchangeability Assurance: Every unit is precision-machined to match the exact porting and mounting specifications of the original AT-series pumps, allowing for a “no-hassle” installation in the field.

Expert Maintenance Tips

• Case Flush Procedure: When replacing an AT455737, it is critical to pre-fill the pump case with clean oil. Running the pump “dry” for even 30 seconds will destroy the piston shoes and cylinder block.

• Suction Line Integrity: John Deere machines often operate in vibrating environments. Regularly check the suction hose for air leaks (aeration), which is the primary cause of noise and cavitation failure in piston pumps.

• Filtration Management: To protect the high-precision internal components, always use genuine John Deere hydraulic filters or high-quality 10-micron alternatives to maintain an ISO 18/16/13 cleanliness level.