A2FO125/61R-PBB05 Rexroth Axial Piston Pump 125cc 400bar

Product Overview:

The A2FO125/61R-PBB05 is a Bosch Rexroth Series 6 fixed displacement axial piston pump of bent-axis design, engineered for hydrostatic drives in open circuits. Flow is directly proportional to drive speed and displacement. It delivers high power density, compact dimensions, and excellent overall efficiency. Manufactured to original specifications for 100% drop-in interchangeability with genuine Rexroth units (common material numbers such as R902138190), every pump undergoes full simulated operating condition testing, ensuring reliable performance in both mobile and stationary applications.

Technical Specifications

• Model: A2FO125/61R-PBB05
• Displacement: 125 cm³/rev
• Nominal pressure: 400 bar
• Peak pressure: 450 bar
• Nominal speed: 1600 rpm
• Maximum speed (with elevated inlet pressure): 3000 rpm
• Flow at nominal speed: 200 L/min
• Power at Δp = 400 bar: approx. 133 kW
• Torque at Δp = 400 bar: approx. 795–796 Nm
• Control type: Fixed displacement (no variable control)
• Direction of rotation: R (clockwise viewing shaft end)
• Shaft end: Parallel keyed shaft DIN 6885 (B)
• Seal material: NBR (P)
• Ports: 05 (side ports A/B and S)
• Mounting flange: ISO 3019-2 four-hole
• Weight (approx.): 32 kg
• Case volume: approx. 0.8 L
• Hydraulic fluid: Mineral oil based fluids

Key Technical Advantages:

1. Precision bent-axis design with one-piece conical pistons and piston rings delivers high volumetric efficiency, minimal internal leakage, and superior overall efficiency with an excellent power-to-weight ratio.
2. High power density in a compact envelope enables strong performance in space-constrained mobile machinery and industrial installations.
3. Long-life drive shaft bearings and optimized rotary group are designed for the expected service life in mobile and industrial duty cycles; the patented cylinder block drive system ensures smooth, low-noise operation.
4. Full dimensional, interface, and performance interchangeability with original Rexroth pumps, combined with 100% simulated duty-cycle testing, guarantees consistency, reliability, and reduced downtime and maintenance costs.

Application Areas:

Construction machinery (excavators, loaders – travel and implement circuits), mobile cranes, concrete pump trucks, port and material handling equipment, marine hydraulics, mining machinery, industrial hydraulic power units, and agricultural equipment requiring high-pressure fixed displacement pumps in open circuits.

Expert Maintenance Tips:

1. Ensure absolute inlet pressure ≥ 1 bar at nominal speed to prevent cavitation; design suction lines and filtration to handle maximum flow.
2. Fully fill and bleed the unit before first start-up; verify case drain and shaft seal integrity. Use high-quality mineral hydraulic oil in the optimum viscosity range of 16–36 mm²/s.
3. Periodically inspect bearings and pistons for wear; monitor case temperature and external leakage. Avoid prolonged operation at peak pressure.
4. When replacing, confirm rotation direction, shaft end, and port configuration match exactly. Perform unloaded and loaded test runs after installation to verify proper function.