A4VSO125 Hydraulic Piston Pump Cast Iron Industrial Equipment 400
Bar Pressure
Features:
1. Variable displacement pump with axial piston rotary group of
swashplate design for hydrostatic drives in open circuit.
2. Swash‑plate axial piston design.
3. Excellent suction characteristics ensure efficient operation.
4. Wide variable displacement range (40–500 cm³/rev).
5. Pre-compression volume design effectively reduces pressure
pulsation.
6. Maximum operating pressure up to 400 bar.
7. Long service life reduces maintenance costs.
8. Rated speed limit up to 2600 rpm.
9. Variable through drive options enhance system flexibility.
10. High volumetric efficiency (> 95 %).
Technical data:
| Size |
|
| 40 | 71 | 125 | 180 | 200 | 250 | 355 | 500 |
| Displacement | Vg max | mL/r | 40 | 71 | 125 | 180 | 200 | 250 | 355 | 500 |
| Max. Speed | Vg= Vg max | nnom | r/min | 2600 | 2200 | 1800 | 1800 | 1800 | 1500 | 1500 | 1320 |
| Vg≤Vg max | nmax | r/min | 3200 | 2700 | 2200 | 2100 | 2100 | 1800 | 1700 | 1600 |
| Flow | at nnom and Vg max | qv | L/min | 104 | 156 | 225 | 324 | 360 | 375 | 533 | 660 |
|
| n = 1500 r/min |
| L/min | 60 | 107 | 186 | 270 | 420 | 375 | 533 | 581 |
Power
Δp=350 bar | n=nnom | P | kW | 61 | 91 | 131 | 189 | 245 | 219 | 311 | 385 |
|
| n = 1500 r/min | P | kW | 35 | 62 | 109 | 158 | 210 | 219 | 311 | 339 |
Torque
Vg= Vg max | Δp=350 bar | Mmax | Nm | 223 | 395 | 696 | 1002 | 1114 | 1391 | 1976 | 2783 |
|
| Δp=100 bar | M | Nm | 64 | 113 | 199 | 286 | 318 | 398 | 564 | 795 |
| Inertia moment of the driveshaft | JTW | kgm2 | 0.0049 | 0.0121 | 0.03 | 0.055 | 0.055 | 0.0959 | 0.19 | 0.3325 |
| Volume of case | V | L | 2 | 2.5 | 5 | 4 | 4 | 10 | 8 | 14 |
| Weight | m | kg | 39 | 53 | 88 | 102 | 102 | 184 | 207 | 320 |
| Permissibleload of the drive shaft | Max.axial force | ± Fax max | N | 600 | 800 | 1000 | 1400 | 1400 | 1800 | 2000 | 2000 |
| Max.radial force | Fq max | N | 1000 | 1200 | 1600 | 2000 | 2000 | 2000 | 2200 | 2500 |
Specifications:
Warranty | 1 Year |
Model | SY-A4VSO |
Place of Origin | China |
Type | Variable axial piston pump |
HS Code | 8413503190 |
Material | Cast iron |
Application | Metal baler,Metallurgy Industry |
Max Speed | 3200 r/min |
Delivery Time | 15-30 Days after Payment |
MOQ | 1 Piece |
Applications:
1. In heavy construction sites, contractors integrate the A4VSO
axial piston pump to power bulldozer blades, hydraulic breakers,
and rotary drills within a single hydraulic circuit. Thanks to the
pump’s high volumetric efficiency and fast dynamic response, the
hydraulic pump maintains steady flow under extreme loads, reducing
cycle times for excavation and rock breaking by up to 15%. This
optimized performance not only accelerates project schedules but
also cuts fuel consumption, ensuring a lower total cost of
ownership and improved operational sustainability in modern
construction machinery fleets.
2. In modern tunnel boring operations, the A4VSO piston pump
provides precise flow control to the TBM’s hydraulic advance and
cutterhead drive. Utilizing load-sensing feedback, the pump
automatically adjusts output when encountering varying rock strata,
preventing pressure spikes and minimizing mechanical stress. This
results in uninterrupted operation even under challenging
geotechnical conditions, enhancing safety and boosting advance
rates by 10–20%. Contractors benefit from reduced maintenance
downtime and more predictable tunneling schedules, making the
hydraulic pump an essential component for high-performance
underground excavation projects.
3. On mid‐ to large‐sized excavators, the A4VSO axial piston pump
serves as the primary hydraulic source for boom, arm, and slew
functions. With its electro-hydraulic proportional control
interface, operators can fine-tune flow rates and pressure settings
to execute delicate trenching and precise material handling. The
pump’s low-noise operation and minimal vibration contribute to
greater cabin comfort, reducing operator fatigue during extended
shifts. Moreover, consistent volumetric efficiency under variable
loads prolongs service intervals and lowers total maintenance
costs, making the piston pump a preferred choice for demanding
excavation applications.
Competitive Advantage:
1. Thanks to its patented swash‑plate axial piston pump
architecture, the A4VSO delivers exceptionally stable performance
even at maximum operating pressures of up to 450 bar, minimizing
internal leakage and component wear over heavy‑duty duty cycles;
this superior piston pump design not only extends maintenance
intervals by up to 30% but also ensures consistent flow and
pressure under variable loads, offering equipment OEMs and end
users a lower total cost of ownership and enhanced operational
uptime for critical industrial and mobile hydraulic applications.
2. The A4VSO’s wide variable displacement range of 20 to
200 cm³/rev empowers system integrators to precisely tailor flow
output to match exact load requirements, reducing throttling losses
and optimizing energy efficiency; by enabling dynamic adjustment of
pump displacement in real time, this axial piston pump design cuts
fuel or electric drive power consumption by up to 15% compared to
fixed displacement alternatives, while also improving system
responsiveness and cycle times, making it an ideal choice for
energy‑sensitive applications in construction machinery, industrial
presses, and mobile hydraulic platforms.
3. Operating reliably up to 3 000 rpm, the A4VSO hydraulic pump
exhibits outstanding volumetric efficiency above 95% and mechanical
efficiency exceeding 90%, ensuring minimal power losses and heat
generation even during demanding high‑speed cycles; this capability
to sustain efficient operation at elevated speeds makes it highly
suitable for applications requiring fast actuation and rapid cycle
rates, such as injection molding machines, high‑speed presses, and
advanced robotics, where maintaining consistent flow under dynamic
conditions is critical to achieving optimal productivity and
product quality.
The Analysis For Rexroth A4VSO Piston Pump Common Breakdown:
1. Plunger ring wear causing unstable displacement: Over extended
operation, the clearance between the piston ring and cylinder bore
increases, escalating internal leakage and reducing volumetric
efficiency. As a result, the pump’s output flow becomes erratic and
system pressure fluctuates, leading to sluggish actuator response.
In high-temperature environments, seals can harden and exacerbate
leaks, further raising oil temperature and creating a vicious cycle
of accelerated fatigue and component failure. Regular inspection of
ring wear and timely replacement are essential maintenance actions
to preserve the A4VSO piston pump’s consistent performance and
service life.
2. Seal aging leading to external leakage: After prolonged service
life, high-temperature seal elements can deform or crack,
permitting hydraulic fluid to leak externally at the shaft seal
area. This oil leakage not only creates safety and environmental
hazards but also deprives the pump internals of proper lubrication,
causing bearing overheating and eventual failure. In extreme cases,
increased axial imbalance can induce excessive vibration that
damages couplings and drive motors. Adhering to
manufacturer‑specified seal replacement intervals and employing
high‑quality hydraulic fluids compatible with ISO VG 32–680
significantly slows seal degradation and extends overall pump
lifespan.
3. Internal cavitation causing performance loss: If entrained air
or vaporous oil bubbles form inside the pump chamber, cavitation
occurs, eroding the piston surface coating and creating
micro‑pitting. Persistent cavitation dramatically reduces
volumetric efficiency and generates excessive noise and vibration.
Technicians can detect cavitation by measuring oil‑borne bubble
content and listening for characteristic “clicking” noises during
operation. Preventive actions include ensuring airtight suction
lines, unobstructed reservoir return paths, and selecting
anti‑foaming hydraulic fluids compliant with DIN 51524–2 to
mitigate bubble formation and protect the axial piston pump from
internal damage.
