AA10VSO71 AA10VSO100 Rexroth Variable Piston Pump 280Bar

Product Overview:

The AA10VSO71DFR/31R-VPA42N00 and AA10VSO100DFR/31R-PPA12KB2 are high-pressure axial piston variable displacement pumps designed specifically for open-circuit applications. Serving as perfect OEM replacements for the Bosch Rexroth Series 31 (SAE version), these pumps offer 100% in-situ interchangeability in dimensions, mounting flanges, and hydraulic ports. Driven by our stringent manufacturing standards, every pump undergoes 100% simulated working condition testing before leaving the factory. This ensures outstanding performance, extended service life, and high volumetric efficiency under extreme industrial conditions, providing a highly cost-effective power core for your hydraulic systems.

Technical Specifications:

• Models: AA10VSO71DFR/31R-VPA42N00 / AA10VSO100DFR/31R-PPA12KB2

• Nominal Displacement: 71 cm³/rev (Size 71) / 100 cm³/rev (Size 100)

• Nominal Pressure: 280 bar (4,000 psi)

• Peak Pressure: 350 bar (5,100 psi)

• Max Permissible Speed: 2,200 rpm (Size 71) / 2,000 rpm (Size 100)

• Control Method (DFR): Pressure and flow control (Load Sensing), precisely matching system flow and pressure demands

• Direction of Rotation: R (Right-hand / Clockwise, viewed from shaft end)

• Mounting Flange & Shaft: Standard SAE specification

• Weight: Approx. 33 kg (Size 71) / Approx. 45 kg (Size 100)

Key Technical Advantages:

• 100% In-Situ Interchangeability: Engineered with standard SAE mounting flanges, splined shafts, and port dimensions, allowing customers to directly replace original Rexroth units without altering any piping or mechanical interfaces, significantly reducing machine downtime.

• Precision Machined Rotary Group: The cylinder block and valve plate are manufactured from high-strength bronze alloy and specially heat-treated steel. Ultra-precision lapping creates an optimal hydrodynamic oil film, maintaining a volumetric efficiency of over 95% at continuous 280 bar pressure while eliminating internal leakage.

• Intelligent DFR Load Sensing Control: The highly responsive DFR control valve automatically adjusts the pump’s output flow and pressure based on the actual load of the actuators. This closed-loop regulation minimizes energy loss during standby and relief phases, improving overall system energy efficiency by up to 30%.

• Heavy-Duty Bearings & Low-Noise Design: Equipped with top-tier international brand tapered roller bearings to withstand high radial and axial loads. The optimized swashplate structure and precisely engineered relief grooves on the valve plate minimize fluid pulsation, resulting in remarkably lower operational noise.

• 100% Factory Simulated Load Testing: We reject random sampling. Every single pump is hooked up to a simulation test bench to undergo rigorous testing—including pressure shock, max speed limits, and flow step-response—guaranteeing that specs aren’t just on paper, but reliably delivered in your machinery.

Application Areas:

Characterized by high pressure, high efficiency, and rapid response, this series of piston pumps is perfectly suited for heavy-duty and precision industrial equipment:

• Plastic Machinery: Clamping and injection systems in injection molding and blow molding machines.

• Metallurgical & Forming Equipment: Main hydraulic power units for hydraulic presses, press brakes, and die-casting machines.

• Mobile Hydraulics: Auxiliary hydraulic circuits in excavators, rotary drilling rigs, and wheel loaders.

• Marine & Offshore: Marine winches, crane hydraulic stations, and steering gear control systems.

Expert Maintenance Tips:

• Initial Start-up & Bleeding: Before the very first start-up, the pump casing must be completely filled with clean hydraulic fluid through the highest case drain port. Failure to do so will result in dry friction and immediate failure of the slipper pads and valve plate.

• Case Drain Pressure Management: The drain line must run directly and unobstructed to the reservoir, terminating below the fluid level. The pressure inside the pump casing must not exceed the suction port pressure by more than 2 bar (29 psi). Excessive back-pressure will cause shaft seal blowout.

• Fluid Cleanliness Control: It is highly recommended to maintain system fluid cleanliness to at least ISO 4406 class 20/18/15. Avoid using excessively restrictive suction filters at the inlet to prevent cavitation noise and premature internal wear.