Guangdong Sheungchak Hydraulic Technology Co., Ltd. is one of the leading manufacturers and suppliers of a4vg90 in China. With abundant experience, we warmly welcome you to buy high-grade a4vg90 for sale here from our factory. All customized products are with high quality and competitive price. Contact us for quotation.
A4VG90 is a closed-loop variable piston pump. Swashplate type. Built for hydrostatic drives where the machine needs forward and reverse control through the pump, not just oil pushed one way to tank. That part is important. This is not the same conversation as an open-circuit working pump. Flow changes with speed and displacement, and the flow direction changes when the swashplate moves through neutral. That is really the heart of this pump.
The A4VG platform includes the boost and pilot supply side, high-pressure relief with boost function, and pressure cut-off as part of the package. So when buyers compare it with simpler closed-loop layouts, the difference is not only pressure rating. It is also how much control and circuit support is already there.
Where does A4VG90 fit in real life? Travel drives are the obvious answer. Road machinery, compact construction equipment, forestry machines, material handling units, ag machines, special vehicles. That is the general world this pump belongs to. Some of those application labels are an inference from how A4VG closed-loop travel-drive pumps are positioned across the family, but the fit is pretty natural.
Key Features & Benefits
Closed-circuit use
For hydrostatic drive systems.
Not for a general open-loop power pack.
Variable swashplate
Flow is adjustable across the working range.
Not locked to one fixed output.
Easy direction change
Forward / reverse through neutral.
No separate reversing unit in the loop.
Compact package
Boost oil and pilot supply built in.
Cleaner layout around the pump.
400 / 450 bar class
Made for real mobile-drive pressure duty.
Not a light-load setup.
Through-drive available
Useful for tandem builds.
Also for extra pump functions.
Wide control choice
NV, HD, HW, DA, DG, EP, EZ, ET, BT.
Selection depends on the machine build.
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Technical Specifications
|
Model |
Control Type |
Displacement (cc/rev) |
Boost Pump (cc/rev) |
Nominal Pressure (bar) |
Max Pressure (bar) |
Nominal Speed at Vg max (rpm) |
Limited Max Speed (rpm) |
Intermittent Max Speed (rpm) |
Flow at nnom & Vg max (L/min) |
Approx. Weight (kg) |
|
A4VG90-NV |
Without control module |
90 |
19.6 |
400 |
450 |
3050 |
3300 |
3800 |
275 |
60 |
|
A4VG90-HD |
Hydraulic pilot-pressure related |
90 |
19.6 |
400 |
450 |
3050 |
3300 |
3800 |
275 |
60 |
|
A4VG90-HW |
Hydraulic mechanical servo |
90 |
19.6 |
400 |
450 |
3050 |
3300 |
3800 |
275 |
60 |
|
A4VG90-EP |
Electric proportional |
90 |
19.6 |
400 |
450 |
3050 |
3300 |
3800 |
275 |
60 |
The size-90 technical data above comes from the A4VG Series 32 technical table. For NG90, it lists 90 cc displacement, 19.6 cc boost-pump displacement, 3050 rpm nominal speed at Vg max, 3300 rpm limited maximum speed, 3800 rpm intermittent maximum speed, 275 L/min flow at nnom and Vg max, 573 Nm torque at 400 bar, and about 60 kg weight without through drive.
For size 90 ports, one standard size-90 port-plate layout shows A/B working ports SAE 1 in, suction port S M48×2, drain ports T1/T2 M33×2, boost inlet G M22×1.5, pilot port PS M18×1.5, and measuring ports MA/MB M14×1.5. Final layout still depends on the exact port plate and control version, so we normally confirm that before quote.
On size 90, common shaft options shown on the dimension pages include DIN 5480 W35×2×16×9g / W45×2×21×9g and ANSI 1 3/4 in 13T 8/16DP / 1 1/4 in 14T 12/24DP depending on the exact build. Mounting variants also include through-drive arrangements in the same size.
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How It Works
The shaft turns the rotating group, and the swashplate creates the pump stroke
Inside A4VG90, the drive shaft rotates the cylinder block and the pistons run against the swashplate. Once the swashplate is tilted, the pistons start their suction and discharge cycle. That is what creates flow. No tilt, almost no output. More tilt, more displacement. Pretty direct.
The loop stays closed, and flow direction changes through neutral
This is one of the big reasons A4VG feels different from an open-loop pump. Oil is circulated directly between pump and motor in the hydrostatic loop instead of being sent out to tank in the usual open-circuit way. Move the swashplate through the neutral position and the flow direction reverses, so the output motor can switch from forward to reverse smoothly.
The built-in support functions keep the closed loop alive
A closed loop needs more than just the main pumping section. Size 90 includes the integrated boost / pilot supply side, and the family also includes pressure cut-off plus high-pressure relief with boost function. That is part of why the package stays compact and still works like a real drive pump instead of a stripped-down hydraulic block.
Model Range
|
Control Type |
Models |
Typical Application |
|
HD |
A4VG90 |
Hydraulic pilot displacement control, mobile travel drives |
|
HW |
A4VG90 |
Manual lever-controlled displacement control systems |
|
DG |
A4VG90 |
Hydraulic remote control circuits |
|
DA |
A4VG90 |
Automatic drive control, road machinery propel systems |
|
EP |
A4VG90 |
Electro-hydraulic proportional displacement control systems |
|
EZ |
A4VG90 |
Two-position electric displacement control |
|
ET |
A4VG90 |
Direct electric proportional control systems |
|
HD1 / HD2 |
A4VG90 |
Optimized hydraulic pilot control for hydrostatic drives |
|
DA1 / DA2 |
A4VG90 |
Travel drive and load-dependent control applications |
Applications & Industries
Construction Machinery
Hydrostatic travel drives on mobile machines.
Fast forward / reverse response.
Agricultural Machinery
Compact hydrostatic drives for off-highway equipment.
Forestry Equipment
Hydrostatic drive systems for forestry machines.
Material Handling
Closed-loop traction drives for handling equipment.
Road Machinery
Travel drives for rollers and other road machines.
A natural match for DA control.
Special Vehicles
Compact reversible drive packages for special mobile equipment.
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 A4VG90 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 A4VG90 an open-circuit pump?
No. It is a closed-circuit variable piston pump. If the machine is built around an open-loop working hydraulic system, this is not the same starting point.
2) What does the "90" mean?
It refers to the main pump size. On NG90, the main displacement is 90 cc/rev, and the integrated boost pump on this size is 19.6 cc/rev.
3) What pressure can A4VG90 handle?
Nominal pressure is 400 bar and maximum pressure is 450 bar. The 450 bar level is for limited operating periods, not something to treat like casual everyday load.
4) What speed and flow are typical on size 90?
At Vg max, size 90 is listed at 3050 rpm nominal speed and 275 L/min flow. Limited maximum speed is 3300 rpm, and intermittent maximum is 3800 rpm under the stated conditions.
5) Does it come with a boost pump?
Yes. The family includes an integrated auxiliary pump for boost and pilot supply, and on size 90 the listed boost-pump displacement is 19.6 cc/rev.
6) What control types are common?
For this size family, the listed control choices include NV, HD, HW, DA, DG, EP, EZ, ET, and BT depending on configuration. In practice, the right one depends on how the machine wants to control the drive.
7) Can A4VG90 be used in travel drives?
Yes. That is one of the clearest fit directions for this pump style. The DA control is explicitly described as a speed-related closed-loop control for travel drives, and the broader A4VG family is also positioned around hydrostatic drive use.
8) What do you need before quoting 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 port layout. On A4VG90, those details matter early because the family has real differences in shafts, controls, port plates, and through-drive versions.
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