Sauer-Danfoss M46 Piston Pump | MPV046CBBBSBBAAGABHHDBAHHCNNN | M46-20741

The Sauer-Danfoss M46 Series from LIC Hydraulic is the benchmark for Closed-Circuit Axial Piston Pumps. Specifically designed for medium-power hydrostatic transmissions, models like the MPV046C… (M46-20741) combine high efficiency with a rugged, compact footprint. Featuring integrated charge pumps and high-pressure relief valves, the M46 series provides a complete power solution for mobile machinery requiring variable speed and seamless bi-directional control. We provide 100% drop-in replacements, matching original Danfoss specifications for displacement, pressure settings, and control response.

Technical Highlights

• Displacement: $46\text{ cc/rev}$.

• Part Number: M46-20741.

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

• Control Options: Manual, Hydraulic Pilot, or Electrical Proportional Control.

Core Advantages

• All-In-One Design: The M46 integrates essential closed-loop functions into a single housing, reducing potential leak points and simplifying system maintenance for OEMs and MRO providers.

• Superior Load Sensing: Engineered with highly responsive swashplate actuators, the pump ensures that the machine reacts instantly to operator inputs, providing smooth acceleration and deceleration.

• Rugged Construction: Built to survive the vibration and heat of construction sites, the hardened steel rotating groups and premium seals ensure consistent performance over thousands of operating hours.

• Optimized Thermal Efficiency: The integrated charge pump provides a consistent flow of cooling oil, maintaining optimal system temperatures even during heavy-duty uphill cycles or high-speed travel.

Expert Maintenance Tips

• Initial Startup: Always fill the pump case with filtered hydraulic oil before starting the engine. Running a M46-20741 “dry” for even a few seconds will cause catastrophic failure of the piston shoes.

• Charge Pressure Verification: Regularly monitor the charge pressure (typically $20\text{–}25\text{ bar}$ above case pressure). Low charge pressure is the primary cause of main pump cavitation and sluggish control.

• Oil Cleanliness: To protect the precision-lapped valve plates and pistons, maintain fluid cleanliness at ISO 18/16/13. Always replace high-pressure filters according to the machine manufacturer’s schedule.