A4VSO180DR/30L-PPB25N00 Loader Ship Steel Plant Coal Mine Hydraulic Pump German Rexroth
Product Introduction
The Rexroth A4VSO180DR/30L-PPB25N00 is a genuine German-manufactured A4VSO series open-circuit axial piston variable pump, featuring DR constant pressure (pressure compensated) control. With a displacement of 180 cm³/r and PPB25 SAE flange & ports, the pump maintains a preset system pressure by reducing displacement toward zero once the set pressure is reached—delivering only enough flow to maintain the commanded pressure level.
This simple, robust control makes the A4VSO180DR a trusted choice across multiple heavy industries: ship deck machinery, loader/earthmoving auxiliary circuits, steel mill hydraulic power units, and coal mine surface installations. Rated for 350 bar continuous / 400 bar peak, it handles the toughest operating environments with reliability.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rexroth, Made in Germany |
| Series |
A4VSO - Open Circuit Swashplate Axial Piston Variable Pump |
| Model Code |
A4VSO180DR/30L-PPB25N00 |
| Geometric Displacement (Vg max) |
180 cm³/r |
| Nominal Pressure |
350 bar |
| Peak Pressure |
400 bar |
| Maximum Speed (nnom) |
Approx. 1800 rpm |
| Theoretical Flow @1500 rpm |
Approx. 270 L/min |
| Theoretical Flow @1800 rpm |
Approx. 324 L/min |
| Drive Power @350 bar & 1500 rpm |
Approx. 158 kW |
| Control Type |
DR - Constant Pressure (Pressure Compensated) Control (pump destrokes when set pressure is reached; maintains constant pressure with variable flow) |
| Rotation |
L - Left-hand (viewed from shaft end) |
| Flange & Port |
PPB25 - SAE Flange & SAE Port (larger porting) |
| Through Drive |
N00 - Without Through Drive (tandem-ready variants available on other A4VSO codes) |
| Hydraulic Fluid |
Mineral Oil HLP, HFC Water-Glycol Permissible (Derated) |
| Approximate Weight |
102-103 kg |
Working ports 13 and 25, flat key splines p and z, seals p and v, control mode: dr, displacement: 180
a4vso180dr/30r-ppb13n00 a4vso180dr/30r-ppb25n00
a4vso180dr/30r-pzb13n00 a4vso180dr/30r-pzb25n00
a4vso180dr/30r-vpb13n00 a4vso180dr/30r-vpb25n00
a4vso180dr/30r-vzb13n00 a4vso180dr/30r-vzb25n00
Working ports 13 and 25, flat key splines p and z, seals p and v, control mode: lr2g
a4vso180lr2g/30r-ppb13n00 a4vso180lr2g/30r-ppb25n00
a4vso180lr2g/30r-pzb13n00 a4vso180lr2g/30r-pzb25n00
a4vso180lr2g/30r-vpb13n00 a4vso180lr2g/30r-vpb25n00
a4vso180lr2g/30r-vzb13n00 a4vso180lr2g/30r-vzb25n00
Working ports 13 and 25, flat key splines p and z, seals p and v, control mode: dfr
a4vso180dfr/30r-ppb13n00 a4vso180dfr/30r-ppb25n00
a4vso180dfr/30r-pzb13n00 a4vso180dfr/30r-pzb25n00
a4vso180dfr/30r-vpb13n00 a4vso180dfr/30r-vpb25n00
a4vso180dfr/30r-vzb13n00 a4vso180dfr/30r-vzb25n00
Working ports 13 and 25, flat key splines p and z, seals p and v, control mode: drg
a4vso180drg/30r-ppb13n00 a4vso180drg/30r-ppb25n00
a4vso180drg/30r-pzb13n00 a4vso180drg/30r-pzb25n00
a4vso180drg/30r-vpb13n00 a4vso180drg/30r-vpb25n00
a4vso180drg/30r-vzb13n00 a4vso180drg/30r-vzb25n00
DR Constant Pressure Control - Simplicity & Reliability
The DR control is the most straightforward variable pump control:
- Pump delivers full flow until system pressure reaches the set value
- Once set pressure is reached, the pump automatically reduces displacement to near-zero
- Only enough flow is delivered to compensate for system leakage—minimizing heat generation
- Pressure setpoint is adjusted via a mechanical spring (integral hex adjuster)
- No external pilot or electrical signal required—self-contained operation
This simplicity makes DR the preferred choice for marine, mining, and steel plant HPUs where reliability and ease of maintenance are paramount.
Typical Applications
- Ship & Marine: deck crane hydraulics, anchor winch systems, hatch cover HPUs, ballast pump drives
- Loader & Earthmoving (Auxiliary): wheel loader auxiliary circuits, bulldozer implement pumps, grader hydraulic systems
- Steel Plant: rolling mill auxiliary HPUs, furnace door/clamp circuits, coil handling systems, caster segment adjustment
- Coal Mine (Surface): coal preparation plant HPUs, conveyor tensioning, stacker/reclaimer hydraulics, mine winder auxiliary circuits
- General Industrial: hydraulic presses, test benches, machine tool hydraulics
Global Sales Countries / Regions
Distributed through Rexroth's authorized global dealer network, including:
- Europe: Germany, Italy, France, UK, Spain, Netherlands, Austria, Switzerland, Poland, Sweden, Norway (marine sector)
- Asia-Pacific: China, Japan, South Korea, India, Taiwan, Thailand, Malaysia, Vietnam, Australia, New Zealand
- Americas: USA, Canada, Mexico, Brazil, Chile (mining & industrial regions)
- Middle East & Africa: UAE, Saudi Arabia, Turkey, South Africa
Frequently Asked Questions
Q1: What is the difference between DR and DFR control on A4VSO pumps?
A1: DR maintains constant pressure only—the pump simply holds pressure and compensates for leakage. DFR adds a flow control pilot port (Y) so pump flow can be commanded independently, enabling load-sensing operation. DR is simpler and more robust; DFR offers greater energy efficiency in variable-flow circuits.
Q2: Can this pump be used as the main travel pump on a loader or excavator?
A2: Not typically. The A4VSO series is an open-circuit pump. Most loaders and excavators use closed-circuit pumps (A4VG or A4VM) for track/wheel drive. The A4VSO180DR is better suited for auxiliary circuits such as implement pumps, cooling fan drives, or supplementary hydraulic functions on these machines.
Q3: Is a pressure relief valve still required with DR control?
A3: Yes. While DR limits pressure, a system pressure relief valve is still required as ultimate overpressure protection in case of control failure or transient spikes.
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