A4VSO355LR2G/30L-PPB25N00 Rexroth Germany made A4VSO355 series piston pump

💡 Code breakdown PPB25N00: P=Keyed shaft | P=NBR seal | B=ISO 4-hole flange | 25=SAE flange side ports | N00=No thru-drive aux pump.

LR2G​ = LR2 hydro-mechanical constant power (hyperbolic) control with remote pilot pressure port (XLR)​ — allows shifting the power limiting curve remotely by applying pilot pressure, useful for multi-motor or load-adaptive power limiting.

Frequently Asked Questions (FAQ)

Q1: What is the difference between LR2 and LR2G control on A4VSO?

A: LR2​ is the basic hydro-mechanical constant power (hyperbolic) control with a fixed, mechanically adjustable power setpoint. LR2G​ adds a pilot pressure port (XLR) so the power limiting curve can be shifted remotely by applying a pilot pressure signal — e.g., to raise or lower the allowed power limit from a central hydraulic or electro-hydraulic station without touching the pump. Both auto-reduce displacement as pressure rises to keep drive power ≤ set limit.

Q2: This model has "L" (counter-clockwise). Can I substitute an "R" (clockwise) version?

A: Only if your drive motor can be reversed. "L" = CCW viewed from shaft end, "R" = CW. The pump housings and port orientations are the same, but shaft rotation direction is not interchangeable​ unless you change motor rotation or coupling arrangement. Verify motor rotation direction before ordering.

Q3: Does A4VSO355 require a case drain line? How to plumb it?

A: Yes, a case drain (housing leakage) line is mandatory.​ Return it directly to tank above the oil level or via a standpipe ≤ 0.5 bar backpressure. Never block it or tee it into the suction line — excessive case pressure will blow the shaft seal. Fill the case with clean hydraulic oil before first start-up.

Q4: Port code "25" vs "13" — what's the difference?

A: "13" = metric threaded / BSP side ports; "25" = SAE flange ports​ (typically Pressure port SAE 6000 psi 4-bolt flange, Suction SAE 3000 psi 4-bolt flange) on the pump sides. Ensure your hose/flange kits match SAE flange pattern, not threaded.

Q5: Critical installation & filtration requirements?

A:

• Filtration: Maintain system cleanliness ≤ NAS 9 (≈ ISO 4406 17/15/12), 10 µm or finer return/full-flow filter.

• Suction: Short, generously sized inlet line; min. inlet pressure 0.8 bar abs; 100–150 mesh suction strainer recommended.

• Alignment: Flexible coupling only — no radial/axial shaft loads​ from the motor.

• Bleeding: Vent pump housing and system high-points before initial run to prevent air-lock/cavitation damage.

Q6: Can this pump run HFC (water-glycol) fluid?

A: Standard P-seal (NBR) version = not compatible​ with HFC or HFD. For HFC (water-glycol), you need the V-seal (FKM/Viton) version​ and must confirm compatibility per Rexroth fluid tables — some HFC blends can still affect FKM. Pure water or HWBF is not recommended for A4VSO.