A4FO28/31R-PSC02K01-S Rexroth Pump 400Bar

Product Overview

The A4FO28/31R-PSC02K01-S is a high-pressure fixed-displacement swashplate axial piston pump engineered on the Bosch Rexroth A4FO Series 31 platform. Designed specifically for open-circuit hydraulic systems in industrial and heavy-duty mobile applications, this unit covers the broader A4FO series (including A4FO16, A4FO22, A4FO28, A4FO40, and A4FO56) and offers 100% direct drop-in interchangeability with original Rexroth pumps. Every pump undergoes 100% full-load simulated factory testing at 400 bar continuous pressure prior to dispatch, guaranteeing maximum volumetric efficiency, superior pressure stability, and long operational life.

Technical Specifications

• Primary Model Code: A4FO28/31R-PSC02K01-S (Covers A4FO series including A4FO16/31R-PSC02K01)

• Brand Architecture: Bosch Rexroth A4FO Series 31

• Pump Design: Swashplate Axial Fixed Displacement Piston Pump (Open Circuit)

• Displacement: 28 cm³/rev (A4FO28)

• Rated Continuous Pressure: 400 bar (40 MPa / 5800 psi)

• Peak Operating Pressure: 450 bar (45 MPa / 6500 psi)

• Maximum Drive Speed: 3000 rpm

• Displacement Type: Fixed Displacement

• Direction of Rotation: Right-hand (R / Clockwise)

• Sealing Material: High-Performance FKM (Viton)

• Unit Weight: Approx. 18 kg

Key Technical Advantages

• Heavy-Duty Swashplate Tribology: Cylinder blocks and pistons feature carbonitrided high-strength alloy steel paired with micro-ground bronze valve plates, maintaining volumetric efficiency above 94% under continuous 400 bar operating conditions.

• Low Noise & Pulsation Optimization: Precision-engineered damping grooves on the valve lens significantly reduce pressure ripple and fluid-borne noise, promoting smoother hydraulic power delivery.

• 100% Direct Drop-in Fit: Flange mounting patterns, drive shaft keys/splines, and SAE fluid ports strictly adhere to original Bosch Rexroth specifications for effortless replacement without plumbing modifications.

• 100% Factory Simulated Testing: Dynamically tested under 400 bar nominal pressure, peak shock loads, and maximum RPM on automated test benches to verify zero external leakage and optimal flow delivery.

Application Areas

• Industrial Machinery: Hydraulic presses, metal balers, injection molding machines, and central hydraulic power units.

• Mobile & Construction Equipment: Secondary open-circuit auxiliary high-pressure supply for large excavators, cranes, road machinery, and concrete pumps.

Expert Maintenance Tips

Flush the main hydraulic circuit thoroughly and replace all suction/return filtration elements prior to mounting the pump. Maintain oil cleanliness strictly at ISO 18/16/13 (NAS Class 8) or cleaner using ISO VG 46/68 anti-wear hydraulic fluid. Always pre-fill the pump cavity completely with clean hydraulic oil through the highest case drain port before initial start-up, performing short engine cranking cycles to bleed trapped air and protect internal friction pairs against dry wear.