Rexroth A10VO71 Variable Pump | AA10VO71 DFR1/31L-VSC12G80 | R902470081 Hydraulic Piston Pump

The A10VO71 Series variable displacement piston pumps from Chengyuan Hydraulic are high-performance units fully compatible with Rexroth 31 Series industrial standards. Featuring a swashplate axial piston design for open-circuit hydrostatic drives, this series excels in precision and efficiency. For the specific model AA10VO71 DFR1/31L-VSC12G80 -SO413 (Part No. R902470081), we utilize a high-precision Load-Sensing regulator (DFR1). Every pump undergoes 100% full-load condition testing to ensure peak volumetric efficiency at 280 bar, guaranteeing 100% original-place interchangeability.

Technical Specifications :

• Series Model: A10VO Series, Size 71

• Displacement: 71 cm³/rev

• Control Type: DFR1 (Load Sensing with pressure and flow control)

• Nominal Pressure: 280 bar (28 MPa)

• Peak Pressure: 350 bar (35 MPa)

• Max. Speed (Self-priming): 2200 rpm

• Max. Flow Rate: Approx. 156 L/min (@ 2200 rpm)

• Rotation: Left Hand (L – CCW)

• Shaft End: SAE Spline (S)

• Mounting Flange: SAE 2-bolt

• Housing Material: High-strength Ductile Iron

• Weight: Approx. 33 kg

Key Technical Advantages:

• DFR1 Precise Control: The DFR1 compensator valve is precision-ground for a highly sensitive differential pressure (Δp) response. It adjusts output flow in real-time based on system demand, significantly reducing heat generation and ensuring smooth actuator movement.

• Reinforced Tribological Pairs: Piston shoes are made of high-strength bimetal materials, and the valve plate surface is nitrided for extreme hardness. This reduces wear at metal-to-metal interfaces under heavy loads, extending service life in high-pressure operations.

• Low-Noise Swashplate Design: Optimized swashplate support and piston force distribution suppress hydraulic pulsation and structural vibration. The noise level at full load remains well below industry averages, improving the working environment.

• Superior Self-Priming Ability: Internally optimized fluid galleries enhance suction performance during high-flow demands, effectively preventing cavitation damage caused by insufficient oil intake at high speeds.

Application Areas:

• Plastic Machinery: Delivering accurate pressure and flow ratios for injection molding.

• Mobile Hydraulics: Auxiliary pumps for excavators, sanitation vehicle systems, and forestry harvesters.

• Industrial Presses: Serving as the main pump in energy-saving load-sensing circuits.

Expert Maintenance Tips:

• Initial Priming: Never start the pump dry. Fill the pump housing with clean hydraulic oil through the drain port before initial operation to protect internal components from instantaneous wear.

• LS Line Bleeding: For DFR1 systems, ensure all air is bled from the Load-Sensing (LS) signal line to prevent flow oscillations or system vibration.

• Fluid Cleanliness: Utilize high-precision suction and return filters to maintain an oil cleanliness level of NAS Class 8 or better. The precision compensators in the A10VO series are highly sensitive to metallic particles.