A4VSO355EO2/30L-PPB13N00 Rexroth Germany A4VSO355 piston pump

Both EO1 and EO2 are electro-proportional displacement controls - pump flow is proportional to the electric command signal via a proportional solenoid + LVDT position feedback. The key difference: EO2 requires a higher external pilot pressure (typically min. 50 bar, often 100 bar for Size 355) to operate the control spool, whereas EO1 can work with lower pilot pressure (≈20 bar, sizes 40-250). EO2 is the version specified for larger displacements (Size 250/355/500+) in the A4VSO Series 30. Always confirm pilot pressure source is available in your hydraulic power unit.

Yes. The PPB mounting code indicates through‑drive capability. You can flange-mount another A4VSO pump (same or smaller size) on the rear to form a tandem combination. N00 = no auxiliary gear pump pre-fitted on the through-drive shaft, but the through-drive shaft is present.

Yes. The pump has the proportional solenoid and LVDT onboard, but requires an external electronic amplifier (e.g. Rexroth VT 5035-1X or PLC analog output card) to supply the command signal (±10V / 4-20mA / PWM as specified) and 24V DC for the solenoid. The amplifier is ordered separately.

Yes, absolutely. EO2 controls displacement/flow only - it provides no pressure limiting function. You must install a properly sized system safety relief valve (e.g. DB type) in the pressure line.

Maintain hydraulic oil at ISO 4406 18/16/13 (NAS 1638 Class 8 -9) minimum, using a return-line filter with β₁₀ ≥ 200 (10 µm nominal). Contaminated oil is the leading cause of A4VSO pump failure.

For A4VSO Size 355 with EO2 control, the typical minimum pilot pressure is 50 bar, often specified as 100 bar depending on the exact sub-version. The pilot oil must be clean and sourced from the main system or a dedicated pilot pump. Lack of adequate pilot pressure will cause the EO2 controller to fail to stroke the swash plate.