Guangdong Sheungchak Hydraulic Technology Co., Ltd. is one of the leading manufacturers and suppliers of a4vso pump in China. With abundant experience, we warmly welcome you to buy high-grade a4vso pump for sale here from our factory. All customized products are with high quality and competitive price. Contact us for quotation.
On a press or large power unit, oil demand rarely stays the same from start to finish. That is where the A4VSO makes sense. It works in an open circuit, with the swashplate moving to raise or reduce the pump displacement as the machine runs.
This is not a pump for a simple fixed-flow job. It is usually chosen for its control options-pressure, flow, power limiting, hydraulic adjustment or electronic control. A through-drive version is useful when the same motor also needs to drive another pump.
Most units go into presses, plastics machines, industrial power packs and larger rebuild projects. Smaller sizes cover normal factory hydraulics. Sizes 500, 750 and 1000 are for much larger systems, with the motor, tank and pipework sized to match.
Key Features & Benefits
Variable swashplate for flexible control
The pump's swashplate angle can be smoothly adjusted from nearly zero up to full displacement. This means you only get the flow you actually need - saving energy by avoiding wasteful bypass.
Strong high-pressure performance Rated for continuous 350 bar and brief spikes up to 400 bar, it handles tough press, clamp, and drive circuits without losing power.
One pump body, multiple control options Whether you prefer pressure compensator, load-sensing, electro-proportional, or power limiter control, all versions share the same core pump design - makes spare parts and repairs much simpler.
Compact yet powerful This A4VSO delivers more hydraulic power per kilo than typical gear pump setups at the same flow rate. High pressure and a small package make it a real space-saver.
Handles contaminants like a champ Built with hardened steel pistons, precision-finished valve plates, and tight-clearance design, it runs reliably with standard 25-micron filtration-no need for special filters.
Runs quietly on the job With 9 pistons (an odd count), pressure pulses spread out evenly, cutting down ripple and reducing noise compared to pumps with even piston counts.
Works with a wide range of hydraulic oils Designed for mineral oils HLP ISO VG 32 to 68, standard FKM seals keep it leak-proof, with NBR seal options for special fluid needs.
Full factory docs included Every pump ships with a factory test report, certificate of conformity, and dimensional drawings. No hidden fees or extra paperwork needed.
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Technical Specifications
These are reference figures for standard rotary-group builds. The nmax figure is available at reduced displacement; it should not be treated as full-displacement continuous speed. Port position, controller body and finished weight may change with the complete model code.
|
Model |
Displacement (cc/rev) |
Pressure Nominal / Max. |
Speed nnom / nmax (rpm) |
Flow at nnom (L/min) |
Typical Suction / Pressure Port |
Approx. Weight |
|
A4VSO40 |
40 |
350 / 400 bar |
2,600 / 3,200 |
104 |
SAE 1½ in / ¾ in |
39 kg |
|
A4VSO71 |
71 |
350 / 400 bar |
2,200 / 2,700 |
156 |
SAE 2 in / 1 in |
53 kg |
|
A4VSO125 |
125 |
350 / 400 bar |
1,800 / 2,200 |
225 |
SAE 2½ in / 1¼ in |
88 kg |
|
A4VSO180 |
180 |
350 / 400 bar |
1,800 / 2,100 |
324 |
SAE 3 in / 1¼ in |
102 kg |
|
A4VSO250 |
250 |
350 / 400 bar |
1,500 / 1,800 |
375 |
SAE 3 in / 1½ in |
184 kg |
|
A4VSO355 |
355 |
350 / 400 bar |
1,500 / 1,700 |
533 |
SAE 4 in / 1½ in |
207 kg |
|
A4VSO500 |
500 |
350 / 400 bar |
1,320 / 1,600 |
660 |
SAE 5 in / 2 in |
320 kg |
|
A4VSO750 |
750 |
350 / 400 bar |
1,200 / 1,500 |
900 |
SAE 5 in / 2 in |
460 kg |
|
A4VSO1000 |
1000 |
350 / 400 bar |
1,000 / 1,200 |
1,000 |
SAE 5 in / 2 in |
605 kg |
Technical notes
The listed flow is theoretical output at nominal speed and maximum displacement.
Actual delivered flow is lower once volumetric efficiency is included.
A separate case-drain connection is required.
Standard main connections use SAE split flanges with metric fastening threads.
Oil cleanliness should normally be kept at ISO 4406 20/18/15 or better; hotter, low-viscosity operation calls for tighter control.
The production drawing takes priority over a general table, especially for controller length and through-drive dimensions.
The displacement, speed, flow, weight and standard port figures are drawn from the technical tables and frame drawings for sizes 40–1000.
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How It Works
Model Range
|
Pump Range |
Models |
Usual Selection Direction |
Suggested Internal Link |
|
Smaller frames |
A4VSO40, A4VSO71 |
Compact industrial power units, moderate flow |
A4VSO40 and A4VSO71 Pumps |
|
Mid-size frames |
A4VSO125, A4VSO180 |
Presses, production machines, larger hydraulic stations |
A4VSO125 and A4VSO180 Pumps |
|
High-flow frames |
A4VSO250, A4VSO355 |
Heavy plant machinery and large motor-pump units |
A4VSO250 and A4VSO355 Pumps |
|
Large frames |
A4VSO500 |
Central hydraulic systems and high-flow projects |
A4VSO500 Variable Piston Pump |
|
Extra-large frames |
A4VSO750, A4VSO1000 |
Large industrial stations, marine and special systems |
A4VSO750 and A4VSO1000 Pumps |
Control Options Commonly Requested
|
Control Group |
Codes Commonly Seen |
What It Handles |
|
Pressure control |
DR, DRG, DP |
Pump pressure and remote pressure setting |
|
Flow control |
FR |
A selected flow level under changing load |
|
Pressure and flow |
DFR |
Flow regulation with pressure override |
|
Power control |
LR |
Keeps drive power within a chosen limit |
|
Hydraulic adjustment |
HM, HD |
Displacement changed by hydraulic signal |
|
Servo / proportional |
HS |
Faster and more accurate swashplate control |
|
Electronic control |
EO, DFE |
Electrical command of displacement, pressure or flow |
|
Secondary control |
DS |
Special speed and pressure control systems |
Not every controller is practical on every frame or hydraulic fluid. A complete order code-or at least a circuit drawing-is needed before production.
Applications & Industries
|
Industry |
Equipment Examples |
What the Pump Does |
|
Hydraulic Power Units |
Factory power packs, central oil stations |
Feeds the valve block. Flow goes up or down with the job. |
|
Press and Forming |
Presses, bending lines, forming machines |
High flow for approach, lower flow while pressing, then more for return. |
|
Plastics and Rubber |
Injection machines, rubber presses, molding lines |
Covers clamping, injection and mold movement without running at full flow all the time. |
|
Heavy Industry |
Forging lines, mill equipment, large transfer systems |
Keeps a steady oil supply during long shifts and changing loads. |
|
Marine and Offshore |
Deck machinery, winches, marine power units |
Runs the hydraulic functions on board. Pump size depends heavily on duty time and cooling. |
|
Retrofit and Testing |
Old power packs, test benches, custom machines |
Updates the oil supply when the tank, motor and pipework can still be kept. |
About Us
Most buyers are really checking a few basic things.
Model right or not. Quality stable or not. Lead time clear or not.
That is how we handle A4VSO Pump orders too.
OEM production
Nameplate customization
Packing adjustment
Drawing or sample confirmation
Export shipment support
Years in business: 20+ years
Main products: hydraulic pumps / motors / valves / spare parts
Main markets: Europe / South America / Middle East / Southeast Asia / Africa
Main strengths: OEM production / technical support / stable lead time / export service
Certifications
Certificate name
Certificate name
Certificate name
Certificate name
Certificate name
Our Factory & Quipment
cooperative partner
We are looking for a cooperative partner to expand our business.
FAQ Display Content
1) Is A4VSO a fixed pump or a variable pump?
It is a variable-displacement piston pump. The shaft keeps turning, but the swashplate angle can move, changing how much oil is delivered per revolution.
2) Does a variable pump always reduce electricity use?
Not automatically. It can cut wasted flow when the system demand changes, but the final result also depends on the controller, electric motor, valve layout and machine cycle. A badly sized system can still waste energy.
3) What oil cleanliness should be kept?
For normal service, ISO 4406 20/18/15 or cleaner is a sensible minimum. At high oil temperature or very low viscosity, tighter cleanliness is needed. Filters should be chosen around the full system, not only the pump inlet.
4) Does the pump need a case-drain line?
Yes. The housing drain must return to the tank with low back pressure. Do not plug it, and do not route it through a line that can build excessive return pressure.
5) Can another pump be mounted behind it?
Selected A4VSO versions support through-drive arrangements. The added pump size cannot be chosen only from flange fit; shaft torque and the permitted combined load also need checking.
6) What is the difference between A4VSO and a gear pump?
A gear pump is simpler and often cheaper. It normally delivers fixed displacement. A4VSO gives adjustable output, higher control flexibility and a much broader range of high-flow industrial configurations.
7) Can SheungChak customize the controller, shaft and port layout?
Yes, within the combinations available for the selected frame. Send the full model code, old-pump photos or a drawing. Shaft form, rotation, controller and port plate need to agree with the machine.
8) What should I send before requesting a quotation?
The full pump code is the best starting point. Also send required quantity, machine use, working pressure, drive speed and clear pictures from the shaft, port and controller sides. For a new project, add the circuit diagram and target flow.
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