Sauer Danfoss 42 Series Axial Piston Pump | 42R28 42L41 42R51 Variable Displacement

The Sauer-Danfoss 42 Series from LIC Hydraulic is a compact, high-power density axial variable displacement piston pump specifically engineered for closed-circuit hydrostatic drives. Covering displacements from $28\text{cc}$ to $51\text{cc}$ (e.g., 42R28, 42L41, 42R51), these pumps are the industry standard for medium-duty mobile applications. Models like 42R28CE1A503B3C2CNN feature integrated charge pumps and multifunctional control valves. We guarantee 100% mechanical interchangeability and subject every unit to 100% full-load testing to ensure precise control and reliable power delivery.

Technical Specifications (Bulleted List)

• Series: Danfoss 42 Series (Closed Circuit)

• Displacements: $28\text{ cm}^3\text{/rev}$, $41\text{ cm}^3\text{/rev}$, $51\text{ cm}^3\text{/rev}$

• Rated Pressure: $350\text{ bar}$ ($5075\text{ psi}$)

• Peak Pressure: $415\text{ bar}$ ($6000\text{ psi}$)

• Max Speed: Up to $4000\text{ rpm}$

• Control Options: MDC (Manual), EDC (Electric Proportional), HD (Hydraulic)

• Rotation: L (CCW) and R (CW) available

• Integral Valves: Includes charge relief, high-pressure relief, and bypass valves

Key Technical Advantages

• Compact Integration: By housing the main pump, charge pump, and all necessary valves in one unit, the 42 Series minimizes hydraulic plumbing, reduces potential leak points, and significantly simplifies machine assembly.

• Smooth Control Response: Equipped with sophisticated displacement control mechanisms (like EDC), the pump provides precise and predictable acceleration and deceleration, critical for the safety and maneuverability of mobile machinery.

• Optimized Quiet Operation: The 9-piston rotating group reduces flow ripple and structural vibration. Combined with precision-ground valve plates, it ensures exceptionally low noise levels across the entire operating range.

• Reliable Charge Cooling: The built-in charge pump provides continuous cooling flow and maintains system pressure within the closed loop, preventing cavitation and extending the service life of internal components under heavy loads.

Application Areas

• Mobile Propulsion: Primary drive pumps for skid steer loaders, rollers, and compact pavers.

• Material Handling: Main traction systems for telescopic handlers and rough-terrain forklifts.

• Ag-Machinery: Drive systems for harvesters and high-clearance sprayers.

• Utility Vehicles: Propulsion and tool drives for municipal sweepers and airport ground support equipment.

Expert Maintenance Tips

• Monitor Charge Pressure: Charge pressure is the lifeblood of a closed-circuit pump. Always verify that charge pressure reaches the specified setting (typically $220\text{–}360\text{ psi}$ above case pressure) upon startup to protect the piston shoes.

• Maintain Oil Cleanliness: Closed-circuit systems recirculate oil; therefore, debris can cause rapid wear. Use high-efficiency filters and replace them according to the ISO cleanliness standards (target 18/16/13).

• Case Pressure Management: Ensure the case drain line is correctly sized and unrestricted. Excessive case pressure (over $2\text{ bar}$/$30\text{ psi}$) will result in shaft seal failure and internal mechanical misalignment.