Rexroth A4VSO180LR2/30L-PPB25N00 Hydraulic Pump
The Rexroth A4VSO180LR2/30L-PPB25N00 is a genuine German-manufactured A4VSO series open-circuit axial piston variable pump equipped with LR2 constant power (horsepower) limiting control. With a displacement of 180 cm³/r and PPB25 SAE flange & ports, the pump automatically reduces its displacement as system pressure rises so that the product of pressure × flow (input power) does not exceed a preset limit.
This feature makes the LR2 version especially valuable when the driving electric motor or engine has a defined power ceiling—preventing overload while maximizing available hydraulic output. It is widely used in heavy presses, extrusion lines, large hydraulic power units, and process plant systems.
Technical Specifications
| Parameter |
Value |
| Manufacturer |
Rexroth, Made in Germany |
| Series |
A4VSO - Open Circuit Swashplate Axial Piston Variable Pump |
| Model Code |
A4VSO180LR2/30L-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 |
LR2 - Constant Power (Horsepower) Limiting Control (displacement decreases as pressure increases to keep input power ≤ preset value) |
| 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 |
LR2 Constant Power Control - Why It Matters
Unlike DR (constant pressure) or DFR (pressure+flow pilot), LR2 protects your prime mover:
- Automatically de-strokes the pump as pressure rises to keep motor input power below a preset kW/hp limit
- Prevents electric motor overheating or tripping on overload during high-pressure stalls
- Allows full flow at low pressure and gradually reduces flow as pressure builds—optimizing energy use
- Adjustable power setpoint via built-in spring or pilot pressure (depending on sub-variant)
- Ideal for fixed-speed electric motor drives where motor rated power is the system bottleneck
➡ Especially recommended when your electric motor is sized close to the pump's theoretical maximum power demand.
Typical Applications
- Heavy hydraulic presses (forging, extrusion, molding) with fixed-power electric drives
- Industrial hydraulic power units (HPU) in continuous-process plants
- Metal forming and stamping lines
- Large plastic injection molding machines (clamp/aux pump)
- Testing laboratories simulating load-limited hydraulic scenarios
- General heavy industry requiring motor overload protection
Global Sales Countries / Regions
Distributed through Rexroth's authorized global dealer network, including:
- Europe: Germany, Italy, France, UK, Spain, Netherlands, Austria, Switzerland, Poland, Czech Republic, Sweden
- Asia-Pacific: China, Japan, South Korea, India, Taiwan, Thailand, Malaysia, Vietnam, Indonesia, Australia
- Americas: USA, Canada, Mexico, Brazil, Chile (industrial regions)
- Middle East & Africa: UAE, Saudi Arabia, Turkey, South Africa
Frequently Asked Questions
Q1: What is the difference between LR2 and DR control on A4VSO pumps?
A1: DR maintains a constant pressure by destroking when set pressure is reached. LR2 limits input power (pressure × flow)—the pump delivers full flow at low pressure and gradually reduces displacement as pressure rises, so motor load never exceeds the preset power limit.
Q2: Can LR2 prevent my electric motor from burning out?
A2: Yes, when correctly set. LR2 ensures the pump will not draw more power than the preset value, helping avoid motor overload during high-pressure hold or stall conditions—provided the LR2 power setting matches your motor's rated capacity.
Q3: Can this pump be used in a closed-circuit hydrostatic transmission?
A3: No. The A4VSO series is designed exclusively for open circuit (open loop) systems. For closed-loop track/wheel drives, use the A4VG or A4VM series.
Q4: Is PPB25 the same as PPB13?
A4: No. Both are SAE flanges/ports, but PPB25 uses the larger SAE port size for higher flow plumbing; PPB13 is the compact version. Pump performance is identical—choose based on your manifold/standard.
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