Rexroth A4FO Fixed Pump

Rexroth A4FO axial piston fixed pump unit

Description:

The Rexroth A4FO is a robust axial‑piston fixed displacement pump employing a swashplate design — engineered for open‑circuit hydraulic drives in both mobile and stationary systems. Flow output is directly proportional to drive shaft speed and the pump’s displacement. The A4FO series offers high power density, impressive volumetric efficiency, and a compact footprint, making it suitable for heavy‑duty applications such as construction equipment, industrial presses, and marine hydraulics.

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Advantages of Rexroth A4FO Fixed Pump

  • Consistent & Predictable Flow: Fixed displacement means flow output scales directly with drive speed — ideal for systems where stable flow is critical.

  • High Pressure Capability: Able to deliver nominal pressures up to 400 bar (with peaks to 450 bar on smaller sizes) — suitable for heavy‑duty hydraulic systems.

  • High Power Density & Efficiency: Swashplate axial‑piston design ensures compact size and high volumetric/mechanical efficiency relative to output.

  • Compact & Installation‑Friendly: Optimized dimensions enable use in tight or constrained spaces; through-drive option allows cascading additional pumps.

  • Good Suction/ Priming & Low Noise: Strong suction characteristics, stable fluid draw, and relatively low noise improve reliability and operator comfort.

  • Durable & Long‑Life Design: Engineered for stationary and mobile applications, designed for long service intervals and dependable performance under heavy load.

Parameter Specification / Detail
Design Type Axial piston, fixed displacement, swashplate, open‑circuit pump
Applicable Sizes NG 22, 28, 71, 125, 180, 250, 500 (and intermediate)
Geometric Displacement (V₉) 22, 28, 71, 125, 180, 250, 500 cm³/rev (depending on size variant)
Nominal Pressure (p_nom) – Sizes 22 & 28: 400 bar – Sizes 71–500: 350 bar
Maximum Pressure (p_max) – Sizes 22 & 28: 450 bar – Sizes 71–500: 400 bar
Flow at nominal speed (q_v) e.g. Size 22 → 79 l/min; Size 28 → 84 l/min; Size 71 → 156 l/min; Size 125 → 225 l/min; Size 180 → 324 l/min; Size 250 → ~375–475 l/min; Size 500 → ~660–750 l/min (depending on speed variant)
Speed Range (nominal / max) Varies by size: e.g. NG 22: up to 3600 rpm (nominal), 4500 rpm (max) ; Larger sizes progressively lower speed — e.g. size 500 max ~1600‑1800 rpm.
Approx. Weight E.g. NG 22 & 28 ~13.5 kg; Size 71 ~34 kg; Size 125 ~61 kg; Size 180 ~76 kg; Size 250 ~120 kg; Size 500 ~220 kg (varies by configuration)
Fluid Type Mineral‑oil based hydraulic fluids (e.g. HLP oils per DIN 51524). Pump may also work with certain fire‑resistant or synthetic fluids depending on size / seal materials.
Applications Mobile machinery (cranes, excavators, concrete pumps, loaders), industrial presses, marine hydraulics, heavy-duty equipment — wherever fixed displacement, high-pressure flow is required.
Design Attributes High total efficiency; high power density; optimized compact dimensions for constrained installations; good suction characteristics; low noise level; long service life; economical design; possible through-drive to combine additional pumps.