Danfoss H1P Series Piston Pump | H1P089 H1P115 H1P147 | H1P089RAA4C2NF6

The Danfoss H1P Series from LIC Hydraulic is the pinnacle of axial variable displacement piston pump technology for closed-circuit hydrostatic transmissions (HST). The model H1P089RAA4C2NF6… is a high-integration unit designed for heavy-duty mobile machinery requiring high-pressure stability and precise electronic control. Covering displacements from $78\text{cc}$ to $147\text{cc}$, the H1P series offers unmatched power density. We guarantee 100% mechanical interchangeability and perform 100% full-load and servo-response testing, ensuring peak performance under a continuous $450\text{ bar}$ rating.

Technical Configuration Details

• Displacement: $89.2\text{ cm}^3\text{/rev}$ (H1P089).

• Control Type (NF6): Electric Displacement Control (EDC) for seamless flow adjustment via electrical signals.

• Pressure Rating: Continuous $450\text{ bar}$ ($6500\text{ psi}$); Peak $480\text{ bar}$ ($7000\text{ psi}$).

• Charge Pump (A4C2): High-capacity integrated charge pump to maintain circuit stability and cooling.

• Relief Settings (L45L45): Factory-preset high-pressure relief valves for system protection in both directions.

Key Technical Advantages

• Extreme Power Density: The H1P series features a compact, shorter housing compared to previous generations, allowing for easier integration into modern engine compartments while delivering higher output.

• Advanced Servo Control: Integrated servo-positioning mechanisms provide incredibly smooth directional changes and precise velocity control, enhancing the operator’s control over heavy mobile equipment.

• Rugged Reliability: Engineered with reinforced bearings and high-tensile swashplate supports, the H1P is built to withstand extreme duty cycles and thermal shocks, significantly reducing total cost of ownership.

• Versatile Control Architecture: Supports multiple control options including EDC, HDC, and fan-drive logic, providing a modular platform for diverse application requirements.

Application Areas

• Agriculture: Main drive for self-propelled harvesters, large sprayers, and tractors.

• Construction: Propulsion for soil compactors, asphalt pavers, and concrete mixers.

• Material Handling: Reach stackers and heavy-duty forklifts.

• Forestry: Walk-drives for feller bunchers and forwarders.

Expert Maintenance Tips

• Charge Pressure Verification: In closed-circuit systems, charge pressure is the lifeblood of the pump. Regularly monitor this pressure at the designated port to prevent cavitation and internal component failure.

• EDC Calibration: For electronic control units (NF6), if you experience jerky movement or lag, verify the solenoid dither frequency and ensure the control current is within the specified linear range.

• Hydraulic Fluid Integrity: Closed-circuit systems are sensitive to heat. Maintain your cooling system and filtration (ISO 4406 18/16/13) to prevent thermal degradation of seals and precision piston-to-bore clearances.