Bosch Rexroth A4VG71EP4D1/32R-NZF02F001SH axial piston variable pump

A4VG71EP4D1/32R-NZF02F001SH, material number R902158135, is a factory-listed A4VG axial piston variable pump for closed-circuit hydrostatic transmissions. Its swashplate changes displacement and therefore flow at a given drive speed. The EP4 control varies displacement through proportional electrical actuation. The circuit supports reversal of flow as the swashplate passes through neutral.

The dated 2009-06 series reference defines 400 bar nominal design pressure and 450 bar peak pressure at A or B; peak exposure must be shorter than 1 second. Integrated boost and pressure-cut-off functions have their own limits and factory settings, which are not inferred from these main-port figures. The selected standard-size table gives 71 cm³/rev geometric displacement, 3300 rpm at maximum displacement and 234 L/min theoretical flow at that speed. These catalog reference values require mineral-oil operation in the optimum 16–36 mm²/s viscosity range and compliance with inlet, shaft-load and drive-torque conditions; they are not universal assembly ratings.

The exact material number and complete factory designation identify this execution. Delivered controller settings, displacement stops, optional equipment and any customized suffix require the binding factory documentation. The technical reference is manufacturer-authored RE92003, edition 2009-06, preserved from a distributor-hosted copy; its date is stated rather than presented as current article-specific approval.

The manufacturer series photograph is representative. Confirm the actual shaft, flange, port and control envelope before installation; the PDF selection preserves relevant complete source pages and distinguishes series geometry from customized delivery details.