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A4VSO125LR2/30L-PPB25N00 Rexroth A4VSO125 series German made piston pump
Product Introduction
The Rexroth A4VSO125LR2/30L-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 125 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 is essential when the driving electric motor has a defined power ceiling -- the LR2 control prevents motor overload while maximizing available hydraulic output. It is widely used in heavy presses, extrusion lines, plant-wide hydraulic power units, and process industry systems. Rated for 350 bar continuous / 400 bar peak.
Technical Specifications
Parameter
Value
Manufacturer
Rexroth, Made in Germany
Series
A4VSO - Open Circuit Swashplate Axial Piston Variable Pump
Model Code
A4VSO125LR2/30L-PPB25N00
Geometric Displacement (Vg max)
125 cm³/r
Nominal Pressure
350 bar
Peak Pressure
400 bar
Maximum Speed (nnom)
Approx. 1900-2000 rpm
Theoretical Flow @1500 rpm
Approx. 187.5 L/min
Theoretical Flow @1800 rpm
Approx. 225 L/min
Drive Power @350 bar & 1500 rpm
Approx. 109 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
75-78 kg
Working ports 13 and 25, flat key splines p and z, seals p and v, control mode: drg
a4vso125drg/30r-ppb13n00 a4vso125drg/30r-ppb25n00
a4vso125drg/30r-pzb13n00 a4vso125drg/30r-pzb25n00
a4vso125drg/30r-vpb13n00 a4vso125drg/30r-vpb25n00
a4vso125drg/30r-vzb13n00 a4vso125drg/30r-vzb25n00
Working ports 13 and 25, flat key splines p and z, seals p and v, control mode: lr2
a4vso125lr2/30r-ppb13n00 a4vso125lr2/30r-ppb25n00
a4vso125lr2/30r-pzb13n00 a4vso125lr2/30r-pzb25n00
a4vso125lr2/30r-vpb13n00 a4vso125lr2/30r-vpb25n00
a4vso125lr2/30r-vzb13n00 a4vso125lr2/30r-vzb25n00
Working ports 13 and 25, flat key splines p and z, seals p and v, control mode: eo1
a4vso125eo1/30r-ppb13n00 a4vso125eo1/30r-ppb25n00
a4vso125eo1/30r-pzb13n00 a4vso125eo1/30r-pzb25n00
a4vso125eo1/30r-vpb13n00 a4vso125eo1/30r-vpb25n00
a4vso125eo1/30r-vzb13n00 a4vso125eo1/30r-vzb25n00
Working ports 13 and 25, flat key splines p and z, seals p and v, control mode: eo2
a4vso125eo2/30r-ppb13n00 a4vso125eo2/30r-ppb25n00
a4vso125eo2/30r-pzb13n00 a4vso125eo2/30r-pzb25n00
a4vso125eo2/30r-vpb13n00 a4vso125eo2/30r-vpb25n00
a4vso125eo2/30r-vzb13n00 a4vso125eo2/30r-vzb25n00
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 (some variants pilot-influenced -- see LR2G for pilot option)
Ideal for fixed-speed electric motor drives where motor rated power is the system bottleneck
➡ PPB25 SAE porting minimizes pressure drop in higher-flow piped hydraulic power units.
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 power sources
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
Power setting procedure, commissioning support and lead time vary by region -- please contact your local authorized Rexroth distributor.
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: Is a pressure relief valve still required?
A3: Yes. A system pressure relief valve is still necessary as ultimate overpressure protection, even with LR2 control.
Q4: Can this pump be used in a closed-circuit hydrostatic transmission?
A4: No. The A4VSO series is for open circuit (open loop) only. For closed-loop track/wheel drives, use the A4VG or A4VM series.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Exporter
Total Annual:
1 million-10 millon
Employee Number:
>50
Ecer Certification：
Verified Supplier
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha... Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha...
