A4VSO250LR+A4VSO250LR

Heavy-duty open circuit pump A4VSO Series Axial Piston Pump Variable displacement swashplate pump engineered for continuous industrial duty. 350 bar rated, 400 bar peak, 18 displacements fro…

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Product Introduction

Heavy-duty open circuit pump

A4VSO Series Axial Piston Pump

Variable displacement swashplate pump engineered for continuous industrial duty. 350 bar rated, 400 bar peak, 18 displacements from 28 to 300 mL/r — a direct replacement for Rexroth A4VSO, A7V, A10VO, A15VSO and PV series.

350 bar

Rated pressure

400 bar

Peak pressure

28–300

Displacement mL/r

2600

Max speed rpm

A4VSO series heavy-duty axial piston pump

Product overview

Built for the toughest hydraulic circuits

The A4VSO is a swashplate-type axial piston pump for open circuits. Its high-performance rotating group, long-life bearing arrangement and precision-finished cylinder block keep volumetric efficiency stable across the full pressure range — even under continuous high-load operation in construction, mining and metallurgical equipment.

Long-life heavy-duty design

High-performance rotating group with multiple patented features, dimensioned for continuous duty at 350 bar rather than intermittent peaks.

High power density

Up to 315 kW at 350 bar and 524 L/min from the 300 mL/r frame — more output per unit of installation space.

18 displacements, one platform

From 28 to 300 mL/r with shared mounting interfaces, so machine variants can be built from a single pump family.

Excellent suction performance

Optimised inlet geometry delivers low noise and reliable self-priming at speeds up to 2600 rpm.

Eight control options

Pressure, remote pressure, pressure/flow, constant power, power with cut-off, load sensing and electro-proportional control.

Through-drive ready

U31, U33, U34 and U35 through-shaft options let you mount a second pump for tandem circuits without a second prime mover.

Technical data

Specifications by displacement

Theoretical values at maximum swashplate angle, with mineral oil in the optimum viscosity range of 16–36 mm²/s and 1 bar absolute inlet pressure.

Size	Displacement (mL/r)	Max speed (rpm)	Max flow (L/min)	Power @350 bar (kW)	Torque @350 bar (Nm)	Weight (kg)
28	28	2600	71	42	156	40
40	40	2600	101	61	223	40
45	45	2600	114	68	250	40
55	55	2200	118	71	306	50
63	63	2200	135	81	351	50
71	71	2200	152	91	395	50
80	80	2200	171	103	445	50
90	88	2200	188	113	490	50
100	100	2100	204	123	557	70
107	107	2100	218	131	595	70
125	125	2100	255	153	696	70
140	140	2100	285	172	779	70
160	160	2000	310	187	890	95
180	180	2000	349	210	1002	95
200	200	2000	388	233	1113	95
250	250	1800	437	263	1391	160
280	280	1800	489	294	1558	160
300	300	1800	524	315	1670	160

Rated pressure 350 bar · peak pressure 400 bar · minimum working pressure 15 bar · inlet pressure 0.8–30 bar absolute · case drain pressure max. 2 bar absolute. Speed ratings apply within the optimum viscosity range of 16–36 mm²/s. Size 90 is listed with a displacement of 88 mL/r — please confirm the exact figure with our engineering team when sizing.

Control options

Match the control to your circuit

Every frame size is available with the full control range, so the same pump platform can serve pressure-held, power-limited or load-sensing circuits.

Pressure control

Holds system pressure constant across the control range and supplies only the flow the system demands. Stepless adjustment from 20 to 350 bar.

DRG

Remote pressure control

Identical pressure-holding behaviour to DR, with a relief valve connected at port X for remote setting. The relief valve is not included.

DFR / DFR1

Pressure & flow control

Adds load-sensing flow control to the pressure function. Flow follows the actual actuator demand through the pressure drop across an external orifice.

Constant power control

Flow varies inversely with pressure so that the product of flow and pressure — and therefore drive torque — stays constant across the working range.

How to order

Reading the model code

Example below: a 250 mL/r pump with DR pressure control, clockwise rotation, keyed shaft and NBR seals.

250 DNS-A4VSO DR /30 R – PPB12 N00

250 — displacement (mL/r)

DNS — Jinrun DNS series

A4V — variable pump, swashplate

SO — standard pump, no charge pump

DR — control type

/30 — series 30

R — clockwise rotation (shaft end view)

P — keyed shaft (Z = DIN 5480 spline)

B — ISO 3019-2 four-bolt flange

12 — SAE ports, metric thread

P — NBR seals (V = FKM)

N00 — standard variant

Also available: LO — supercharged pump with charge pump (sizes 160–300), and LODT — supercharged double pump. Supercharged versions must be mounted below the minimum oil level of the reservoir.

Applications

Where the A4VSO is used

Heavy construction machinery, mining and metallurgical equipment, and any open-circuit system that needs sustained pressure at high flow.

Construction machinery

Rotary drilling rigs, piling equipment, cranes, excavators and concrete machinery.

Mining & tunnelling

Roadheaders, shield machines, drilling jumbos and underground haulage systems.

Metallurgy

Continuous casting, rolling mill auxiliaries, presses and furnace charging equipment.

Need help selecting the right size?

Send us your flow, pressure and speed requirements — our engineers will confirm the displacement, control type and mounting configuration within one working day.

Request a quote

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