Rexroth A2FO23 A2FO45 A2FO56 A2FO500 Axial Piston Fixed Pump

The premium A2FO Series Axial Piston Fixed Displacement High-Pressure Pumps (encompassing high-speed specific models A2FO23 61R-PBB05, A2FO45/61L-PPB05, A2FO56/61R-PPB05, and the industrial heavy-duty massive delivery execution A2FO500/60R-VPH / VPH11) by Chengyuan Hydraulic represent durable, professional fluid power components engineered for 100% direct drop-in interchangeability within global open-circuit hydraulic networks. Manufactured in strict structural alignment with Bosch Rexroth official Series 60 and Series 61 technical codes, this fixed-displacement pump portfolio perfectly matches original mounting pilot profiles, shaft end configurations (parallel keyed or splined types), and high-pressure ports. B2B global industrial procurement sectors can implement immediate on-site equipment swaps without modification to system chassis brackets or connecting manifolds.

Operating as the rugged hydraulic energy generator for heavy-duty systems, the A2FO pump line leverages an advanced 40° bent-axis piston arrangement. By discarding the conventional slipper-and-swashplate layout of standard inline pumps, this bent-axis configuration delivers high mechanical strength and exceptional resistance to high shaft speed thresholds and extreme peak shock pressures. At Chengyuan, zero compromise is tolerated; every A2FO fixed pump completing production must pass our 100% rigorous dynamic simulation test bench schedule. By evaluating fluid delivery stability at a continuous 350 bar load, tracking case drain leakage profiles across the entire thermal bandwidth, monitoring operational noise levels, and ensuring volumetric precision, we guarantee our replacement units mirror original-brand performance in the field.

Technical Specifications

• Product Series Classification: A2FO Bent-Axis Axial Piston Fixed Displacement Pump (Series 60 / 61)

• Hydraulic Circuit Application: Open Circuit System Configurations

• Nominal Continuous Operating Pressure: 350 bar (35 MPa)

• Maximum Peak Shock Pressure: 400 bar (40 MPa)

• Drive Shaft Specification: P (Parallel keyed drive shaft adhering to DIN 6885)

• Model-Specific Engineering Data (Catalog Verified):

  • Model Designation: A2FO23 61R-PBB05 (Series 61, Clockwise Rotation)

  • Geometric Displacement: 22.9 cc/rev ($cm^3/rev$); Rotation: R (Clockwise); Maximum speed under minimum inlet pressure: 4750 rpm; Theoretical output flow at 1450 rpm: 33.2 L/min; Net Weight: Approx 10.0 kg.

  • Model Designation: A2FO45/61L-PPB05 (Series 61, Counter-Clockwise Rotation)

  • Geometric Displacement: 45.6 cc/rev ($cm^3/rev$); Rotation: L (Counter-Clockwise); Maximum speed under minimum inlet pressure: 3750 rpm; Theoretical output flow at 1450 rpm: 66.1 L/min; Net Weight: Approx 18.0 kg.

  • Model Designation: A2FO56/61R-PPB05 (Series 61, Clockwise Rotation)

  • Geometric Displacement: 54.8 cc/rev ($cm^3/rev$); Rotation: R (Clockwise); Maximum speed under minimum inlet pressure: 3150 rpm; Theoretical output flow at 1450 rpm: 79.5 L/min; Net Weight: Approx 18.0 kg.

  • Model Designation: A2FO500/60R-VPH (VPH11) (Series 60, Heavy Industrial Execution)

  • Geometric Displacement: 500.0 cc/rev ($cm^3/rev$); Rotation: R (Clockwise); Sealing Configuration: V (Premium FKM Viton compounds for high-temperature resilience); Maximum self-priming speed: 1400 rpm (extendable under boost filtration input); Theoretical flow at 1000 rpm: 500.0 L/min; Net Weight: Approx 240.0 kg.

Key Technical Advantages

• 40° Bent-Axis Layout & Optimized Power Density: Features a 40° bent-axis piston arrangement where the tapered piston heads are integrated directly into the drive shaft flange. This layout eliminates the traditional slipper wear track found in swashplate pumps, reducing centrifugal stresses, maximizing radial/axial strength, and optimizing the power-to-weight ratio.

• Micron-Precision Lapped Bi-Metal Valve Plate Pair: The interface running between the rotating cylinder barrel and the flat steel valve plate is processed with multi-axis CNC mirror-lapping. The plate surface incorporates a high-grade, vacuum-sintered copper alloy layer held to a flatness tolerance within $\le 1\,\mu\text{m}$. Under a continuous 350 bar load, this layout generates a highly stable hydrostatic oil film, keeping volumetric efficiency above 95% and suppressing system heat generation.

• High-Tensile Monoblock Ductile Iron Housing: The pump housing is cast as a single piece from high-density ductile iron, delivering high yield strength and fatigue resistance. Under severe 400 bar pressure peaks, micro-elastic deflection is minimized, preserving precise coaxial alignment between the internal bearings and the cylinder centerline to suppress fluid-borne mechanical noise.

• Heavy-Duty Tapered Roller Bearings for Residual Load Resistance: The input shaft assembly is supported by oversized tapered roller bearings pre-set to tight tolerances. This robust configuration allows the drive shaft to comfortably handle radial and axial residual loads introduced by external mechanical couplings or gear drives, extending service life under continuous industrial vibration.

Application Areas

Thanks to its high rotational velocity capabilities, robust structural framework, and strong shock-load tolerance, the A2FO pump series is widely integrated as the primary power generator across open hydrostatic systems:

• Mobile Truck Hydraulics & Municipal Assets: Primary crane super-structure power units for truck cranes, secondary charging pumps for high-capacity concrete transit mixers, heavy-duty municipal waste compactors, and asphalt cold millers.

• Heavy Industrial Pressing & Tooling Machinery: High-delivery primary charging pumps for four-column universal hydraulic press lines, secondary power units for industrial scrap metal shears/balers, and sheet-metal press brakes.

• Marine Deck Operations & Port Cargo Logistics: Primary fluid power sources for marine deck mooring winches, main pump drives for port rubber-tired gantry (RTG) crane slewing drives, and container reach stackers.

Expert Maintenance Tips

• Mandatory Pre-Commissioning Housing Priming: Because the A2FO series relies entirely on the internal oil bath inside the pump frame for piston-and-cylinder lubrication, the housing must be fully pre-filled with clean, filtered hydraulic fluid via the highest available drain/vent port prior to initial commissioning. Running the unit dry will destroy the core tribological pairs within seconds.

• Verify Absolute Suction Line Seal Integrity & Diameter: As a self-priming open-circuit pump, the suction plumbing must be airtight and sized for proper flow. Ensure the inlet vacuum level does not drop below -0.3 bar. Any air entry or restricted flow will cause severe cavitation pitting, leading to premature delamination of the bi-metal valve plate.

• Enforce Strict Fluid Hygiene Benchmarks: Maintain system fluid cleanliness at or above ISO 4406 19/16/13 (NAS Class 7-8). Conduct routine inspection intervals and replace intake/return filter elements to prevent abrasive particles from scratching the internal mating faces, preserving the high volumetric efficiency of the A2FO pump.