A4VSO355EO2/30L-PPB25N00 German Rexroth A4VSO355 series piston pump
High-performance variable displacement axial piston pump designed for heavy-duty industrial applications with electro-hydraulic pilot control.
| Parameter Category | Parameter | Specification / Description |
|---|---|---|
| General Information | Manufacturer / Series | Rexroth (Germany), A4VSO Open Circuit Variable Axial Piston Pump |
| Full Model Code | A4VSO355EO2/30L-PPB25N00 | |
| Functional Summary | 355 cm³ displacement • EO2 Electro-Hydraulic Pilot Control • CCW Rotation • PPB25 Ports • No Through-Drive | |
| Hydraulic Performance | Geometric Displacement | 355 cm³/rev (≈ 21.7 in³/rev) |
| Nominal Continuous Pressure | 350 bar (≈ 5075 psi) | |
| Peak Intermittent Pressure | 400 bar (≈ 5800 psi) | |
| Recommended Speed Range | 1000 - 1500 rpm (Max ~1800 rpm subject to inlet conditions) | |
| Theoretical Flow @ 1500 rpm | 355 × 1500 ÷ 1000 = 532.5 L/min | |
| Control Type | EO2 — Electro-Hydraulic Control (Pilot Pressure Dependent): Displacement commanded by external pilot pressure at port X; no internal LS spring. Often paired with a proportional reducing valve or Rexroth RC/VT controller. | |
| Mechanical Interface | Shaft Type | Parallel Key Shaft (DIN 6885) |
| Rotation Direction | L = Counter-Clockwise (CCW) — viewed from shaft end | |
| Mounting Flange | ISO 3019-2 (4-bolt, metric) | |
| Port Configuration | PPB25: SAE flanged ports, metric screws, Series 25 port plate (larger than 13-series) | |
| Through Drive | N00 = No through-drive (cannot mount auxiliary pump on rear) | |
| Seals & Media | Seal Material | NBR (Nitrile Rubber) — standard for mineral oil |
| Compatible Fluids | Mineral oils (HL/HLP), HFC (Water Glycol with derating); NOT HFD (Phosphate Ester) unless FKM-sealed version | |
| Oil Temperature Range | −20 °C to +70 °C (with NBR seals) | |
| Fluid Cleanliness Required | ISO 4406 17/15/12 or cleaner (NAS 1638 Class 7 equivalent) | |
| Physical Data | Approximate Weight | 195 kg |
| Case Drain Ports | 2 × G1/2 (use one to tank, plug the other; backpressure ≤ 0.5 bar) | |
| Recommended Suction Line | ≥ DN65/DN80, short & straight, with 100 mesh (149 µm) suction strainer |
EO2 (Electro-Hydraulic / Pilot-Dependent): The pump has no internal spring setting a load-sense ∆p or fixed pressure. Displacement is governed entirely by pilot pressure Pₓ at port X (from a proportional reducing valve or electronic controller).
- Pₓ = 0 (or below bias) → pump at min displacement / near zero delivery
- Increasing Pₓ → swashplate angles proportionally → increases displacement up to max
- A separate pressure limiter (mechanical DR element) is usually integrated to cap max pressure regardless of pilot signal
When to use EO2: You want electronic/discrete remote control of pump displacement or flow via a pilot valve, or integration into a digital/hybrid control architecture — not a standard LS system.
L = Counter-Clockwise (CCW): Face the drive shaft end (coupling side looking into the pump); the shaft must rotate counter-clockwise.
Verify motor rotation arrow or perform a brief jog test before coupling.
- Port plate alignment is directional → suction failure → cavitation/seizure
- Internal lubrication channels are direction-specific → immediate loss of lube film
- Damage occurs within seconds → total pump destruction
If rotation mismatches, either re-phase motor or order an "R" (clockwise) version.
Large displacement pumps need careful inlet design:
- Minimum absolute inlet pressure ≥ 0.8-1.0 bar (gauge ≈ −0.2 to −0.1 bar vacuum max)
- For sustained 1500 rpm or higher, consider a boost/charge pump providing 1.0-1.5 bar positive head
- Suction line requirements:
- Inner diameter ≥ DN65 (DN80 preferred)
- Keep length < 1.5 m, minimize bends/restrictions
- 100 mesh (149 µm) suction strainer with < 0.05 bar pressure drop
- Tank outlet submerged ≥ 300 mm or above pump inlet
Cavitation signs: high-pitched whine, valve plate pitting, flow drop, early bearing failure
No. The suffix N00 = no through-drive shaft. Rear housing is blanked. If you need a through-drive for an auxiliary pump (e.g., gear pump for pilot/charge pressure), select a version with through-drive code such as K01, K02, K51, etc. For EO2 control you'll typically need a separate pilot pressure source anyway — plan accordingly.
- Connect one case drain port via a dedicated line directly to the tank (above oil level or looped to prevent siphon)
- Backpressure ≤ 0.5 bar (ideally 0 bar). Plug the unused drain port
Result of neglect: Housing pressurizes → shaft seal blows out, valve plate distorts, bearings overheat → pump fails.
At 350 bar / 1500 rpm / full displacement:
- Hydraulic power Pₕ = (355 × 10⁻⁶ × 350 × 1500) ÷ 600 ≈ 310 kW
- With ηₘₑcₕ ≈ 0.90 → shaft input ≈ 345 kW
Recommended drive: 355 kW (≈475 HP) electric motor, S1 duty, with adequate starting torque for 400 bar peak. Avoid prolonged operation below ~750 rpm minimum continuous speed.
- HFC (Water Glycol): NBR acceptable with pressure/temperature derating per Rexroth (typically ×0.8 pressure factor, watch Tmax)
- HFD (Phosphate Ester): NBR will swell → must specify FKM (Viton) seal version (/V suffix or explicit FKM option)
- Standard mineral oil (HL/HLP) → no issue with NBR
- Fill & bleed: Loosen case drain and HP port bleed screw. Hand-rotate shaft while filling till oil flows bubble-free
- Verify case drain line is open to tank
- Jog-test rotation — confirm CCW (L), no abnormal noise
- Low-pressure run-in: Back off DR pressure screw; run briefly to purge air from system
- Set pressure: Slowly turn DR adjustment screw clockwise to desired max pressure. EO2 pilot pressure from external valve will modulate displacement below that ceiling
- Lock & document: Tighten lock nut on DR adjuster; record settings
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