A4VSO250LR2/30L-PPB25N00 Original imported German Rexroth A4VSO250 piston pump

Name: A4VSO250LR2/30L-PPB25N00 Original imported German Rexroth A4VSO250 piston pump
Brand: Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.

Price Negotiable

Price: Negotiable

MOQ: 1

Delivery Time: 2 weeks

Brand: Rexroth

Product Description

A4VSO250LR2/30L-PPB25N00 Original imported German Rexroth A4VSO250 piston pump

Product Specifications

Model	A4VSO250LR2/30L-PPB25N00
Brand / Origin	Rexroth / Germany
Type	Swashplate-type axial piston variable pump (Open circuit)
Displacement (Vg max)	250 cm³/rev
Control Type	LR2 — Hydro-mechanical constant power (horsepower) control, follows a hyperbolic characteristic curve (P×Q = const). Adjustable starting point of power limiting via set screw.
Nominal Pressure	350 bar (35 MPa) Continuous
Peak / Maximum Pressure	400 bar (40 MPa) Intermittent
Maximum Speed (nₘₐₓ)	1500 rpm @ Vg max (Size 250)
Recommended Speed	1000 - 1500 rpm
Theoretical Flow @ 1500 rpm	≈ 375 L/min (Q = n × Vg / 1000)
Rotation Direction	L — Counter‑clockwise (viewed from shaft end)
Mounting Flange	ISO 3019‑2 / Series 30, 4‑bolt (Code PP)
Through‑drive	Yes — PPB indicates through‑drive capable (N00 = no auxiliary pump fitted)
Port Configuration	PPB25 — SAE flange side ports (P & T 90° apart), second pressure port B1 opposite B plugged with SAE flange blank
Seal Material	FKM (Fluoroelastomer / Viton, standard for mineral oil HLP)
Case Drain	Two case drain ports — must be routed to tank < 2 bar backpressure
Recommended Oil Viscosity	16 - 100 mm²/s (optimal ISO VG 46 at operating temp)
Oil Cleanliness Requirement	ISO 4406 18/16/13 (NAS 1638 Class 8-9)
Net Weight (Approx.)	≈ 145-150 kg (dry, excl. coupling)
Package / Condition	Original factory wooden crate, new unused, German import
Salable / Supply Region	Global — Available via Rexroth authorized industrial hydraulics distributors (Europe, Americas, Asia-Pacific incl. China mainland)

Rexroth A4VSO250LR2 piston pump product image

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Model Code Breakdown

A4VSO — Axial piston variable pump, open circuit
250 — Displacement 250 cm³/rev
LR2 — Constant power (horsepower) control, hyperbolic characteristic, mechanically adjustable start of power limiting
30 — Design Series 30
L — Counter‑clockwise rotation (viewed from shaft end)
PPB25N00
- PP — Through‑drive capable, ISO 4‑bolt flange, metric keyed shaft
- B25 — SAE flange side ports (P & T 90° apart), second pressure port B1 plugged
- N00 — No auxiliary pump / no special option on through‑drive

Frequently Asked Questions

What does LR2 (constant power / horsepower control) do?

LR2 is a hydro-mechanical constant power controller. The pump automatically reduces its displacement (flow) as system pressure rises, so that the product of Pressure × Flow ≈ constant (Power = const) — following a hyperbolic curve. This prevents the prime mover (electric motor / engine) from being overloaded. The starting point of power limiting is adjustable via a mechanical set screw on the LR2 controller. LR2 is purely mechanical/hydraulic — no electronics required.

How is LR2 different from DR (pressure control) or DFR (load-sensing)?

DR: Maintains constant pressure; pump strokes to near-zero when pressure setpoint is reached.
DFR / DFR1: Load-sensing + pressure limiting — adjusts flow to match demand.
LR2: Does NOT hold constant pressure; it limits total absorbed power. At low pressure the pump can deliver full flow; as pressure climbs the swash plate is mechanically forced back to keep P×Q below the set power limit. If system pressure is low, pump stays at full displacement.

Can I mount a second pump on the back?

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

What are critical installation points for LR2 pumps?

Case Drain: Plumb directly to tank, backpressure ≤ 1.5-2 bar. Never tee into main return.
Suction Line: Keep short & large-diameter; ensure absolute inlet pressure ≥ 0.8 bar to avoid cavitation. Use 100 µm suction strainer.
Rotation Check: "L" = counter‑clockwise when viewed from shaft end — verify prime mover direction before coupling.
LR2 Adjustment: Set the power-limiting screw so that P×Q at max pressure does not exceed motor rated power (allow ~10% margin for losses).
Bleed: Fill case and suction with oil and vent before first start-up.

Is a system relief valve still required with LR2?

Yes, absolutely. LR2 limits power but has no precise pressure cut-off function — it can allow pressure to rise above safe levels if flow demand drops to near zero and the control is misadjusted. A system safety relief valve (e.g. DB type, set above max working pressure + margin) is mandatory.

What oil cleanliness is required?

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). Particle contamination is the leading cause of premature A4VSO pump failure.

What is the PPB25 port configuration?

B25 = SAE flange side ports with pressure port (B) and tank port (S) 90° apart, plus a second pressure port (B1) on the opposite side of B, normally plugged with a SAE flange blank. This allows cascade loading or superimposed signals in multi-pump systems.