Guangdong Sheungchak Hydraulic Technology Co., Ltd. is one of the leading manufacturers and suppliers of a4vg71 in China. With abundant experience, we warmly welcome you to buy high-grade a4vg71 for sale here from our factory. All customized products are with high quality and competitive price. Contact us for quotation.
A4VG71 is a variable axial piston pump built for closed-loop hydrostatic transmission systems. This point matters. It is not an open-circuit working pump pretending to do travel-drive work. The unit uses a swashplate design, and the flow changes with speed and displacement. Push the swashplate through neutral and the flow direction changes too. That is one of the reasons this pump shows up in machines where forward / reverse response and compact drive layout are part of the job, not an extra.
Another thing people usually care about on this model is the integrated setup. A4VG71 already includes the auxiliary pump for boost and pilot oil supply, plus high-pressure relief valves with boost function, and adjustable pressure cut-off as standard. So the pump package is not stripped down. It is made for real closed-circuit duty, where stability, charge pressure, and control response all matter.
Where does it fit in practice? Travel drives. Winch drives. Compact hydrostatic machines. Road equipment. Some handling equipment too. Not every machine needs a pump like this. But if the system is closed loop and needs directional flow change through neutral, this is the kind of layout people usually look at. That is the lane for A4VG71.
Key Features & Benefits
Closed-circuit design keeps it right for hydrostatic drive systems, not general-purpose open-loop layouts.
Swashplate variable displacement gives smooth flow change and directional reversal through neutral.
Integrated boost and pilot oil supply pump saves space and simplifies the drive package.
Standard pressure cut-off and relief arrangement make the pump more usable in real machine duty.
Through-drive option helps with tandem layouts or pump combinations when the system needs more than one function.
Good control range: hydraulic, electric, speed-related, direct operated. More choice when matching the machine.
Size 71 gives a solid middle ground. Not too small for real hydrostatic work, not oversized for every build.
Base unit weight is about 50 kg without through drive, so it stays workable for mobile machine packaging. Final weight can shift with equipment.
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Technical Specifications
|
Model |
Control Type |
Displacement (cc/rev) |
Nominal Pressure (bar) |
Max Pressure (bar) |
Max Speed at Vg max (rpm) |
Flow at nnom & Vg max (L/min) |
Port Layout |
Approx. Weight |
|
A4VG71-NV |
Without control module |
71 |
400 |
450 |
3300 |
234 |
A/B working ports, S suction, T1/T2 drain, G boost, PS pilot |
approx. 50 kg base unit |
|
A4VG71-HD |
Hydraulic pilot-pressure related |
71 |
400 |
450 |
3300 |
234 |
A/B, S, T1/T2, G, PS, Y1/Y2 |
approx. 50 kg base unit |
|
A4VG71-EP |
Electric proportional |
71 |
400 |
450 |
3300 |
234 |
A/B, S, T1/T2, G, PS, X1/X2 |
approx. 50 kg base unit |
|
A4VG71-DA |
Speed-related automatic control |
71 |
400 |
450 |
3300 |
234 |
A/B, S, T1/T2, G, PS, Y, Z |
approx. 50 kg base unit |
Core size-71 data in the current series shows 71 cc/rev main displacement, 19.6 cc/rev boost pump displacement, 400 bar nominal pressure, 450 bar maximum pressure, 3300 rpm maximum speed at Vg max, 234 L/min flow at nnom and Vg max, and about 50 kg weight without through drive. Weight can vary with equipment.
For the size 71 port arrangement, the standard layout includes SAE A/B working ports, M42×2 suction port S, M26×1.5 drain ports T1/T2, M18×1.5 boost inlet G, M14×1.5 pilot port PS, and M12×1.5 measuring / control ports depending on the control version. Final port use depends on the selected configuration and installation position.
Shaft options on size 71 include splined versions such as DIN 5480 Z / A and ANSI spline S / T, so when quoting, shaft detail should be confirmed early. Not later.
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How It Works
The shaft drives the cylinder block, and the pistons run against the swashplate. As the swash angle changes, the pump displacement changes with it. Bigger angle, more flow. Smaller angle, less flow. Cross the neutral position, and the flow direction reverses. That is the basic motion inside the unit.
Because this is a closed-circuit pump, oil is not simply sent out to tank like an open-loop system. The flow circulates between pump and motor in the drive loop. The integrated boost pump keeps the circuit supplied with charge and pilot oil, and the relief / boost functions help protect and stabilize the transmission side.
That is why A4VG71 is usually used where motion control matters. Travel drive. Winch drive. Forward / reverse duty. Repeated direction change. It is less about "just making oil flow" and more about making the machine move the way it should.
Model Range
|
Control Type |
Models |
Typical Application |
|
HD |
A4VG71 |
Mobile travel drives, hydrostatic transmissions |
|
HW |
A4VG71 |
Lever-controlled hydraulic drive systems |
|
DG |
A4VG71 |
Hydraulic pilot control circuits |
|
DA |
A4VG71 |
Road machinery, propel drives |
|
EP |
A4VG71 |
Electro-hydraulic displacement control systems |
|
EZ |
A4VG71 |
Two-position electric displacement control |
|
ET |
A4VG71 |
Direct electric proportional control systems |
|
HD1 / HD2 |
A4VG71 |
Travel drives with optimized hydraulic control |
|
N |
A4VG71 |
Neutral position control applications |
Applications & Industries
Road Machinery
Closed-loop travel and vibration drives
Construction Equipment
Hydrostatic travel systems for compact and mid-size machines
Material Handling
Compact closed-loop drive systems with travel control
Agricultural Machinery
Off-highway hydrostatic drive applications
Winch & Drive Systems
Closed-circuit winch and drive duty
Municipal & Special Vehicles
Sweepers, compact carriers, and special-purpose drive systems
About Us
Sheungchak is an OEM hydraulic manufacturer focused on pumps, motors, valves, and related spare parts. We produce our own products and support customers from model confirmation through shipment.
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 A4VG71 orders too.
OEM production
Nameplate customization
Packing adjustment
Drawing or sample confirmation
Export shipment suppor
Years in business
20+ years
Main products
Axial piston pumps / hydraulic 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
1) Is A4VG71 an open-circuit pump?
No. This one is for closed-circuit hydrostatic systems. If the machine is built around an open-loop working hydraulic circuit, you should not treat it like the same kind of pump.
2) What does the "71" mean?
It refers to the pump size. Main displacement is 71 cc/rev. On this size, the integrated boost pump displacement is 19.6 cc/rev.
3) What pressure can this model handle?
Nominal pressure is 400 bar. Maximum pressure is 450 bar. The 450 bar level is for limited operating periods, not something to treat casually all day.
4) What speed and flow does A4VG71 run?
For size 71 in the current series, max speed at Vg max is 3300 rpm, and flow at nnom and Vg max is 234 L/min. Actual machine flow still depends on how the system is set up.
5) Does it have through-drive?
Yes, through drive is available on the series. That makes tandem or combined layouts easier when the machine needs more than one hydraulic function from the same drive arrangement.
6) What control options can be used on A4VG71?
Common options on size 71 include NV, HD, HW, DA, DG, EP, and EZ. Which one is right depends on how the machine wants to control travel or drive response.
7)Is this the same as a gear pump?
No. Different job. A4VG71 is a variable axial piston pump for closed-loop hydrostatic drive work. A gear pump is usually chosen for much simpler hydraulic supply duties. If the system needs directional travel control through neutral, this pump belongs to a different category.
8) What do you need from me to quote the right unit?
Best case, send the full model code. If not, send photos of the old unit, shaft detail, flange, control type, rotation direction, and machine application. For A4VG71 especially, control version and shaft type should be confirmed early, or the order can go sideways for no good reason.
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