A7VO Series Hydraulic Pump for Rexroth A7VO107 A7VO160 A7VO250 Variable Piston Pump LRDS EP Suitable for Concrete Pump Truck

A7VO Series Variable Displacement Axial Piston Hydraulic Pump — Aftermarket Replacement for Bosch Rexroth A7VO Series (Sizes 28-160 cc/rev, Open Circuit, 350 bar)The H-STAR A7VO series is an aftermarket replacement variable displacement axial piston hydraulic pump with bent-axis design, fully compatible with Bosch Rexroth A7VO series (sizes 28-160 cc/rev). This pump is designed for hydrostatic drives in open circuits, delivering high pressure output with variable flow control that can be steplessly adjusted from maximum to zero.

The bent-axis design with tapered pistons provides superior power density, high volumetric efficiency, and excellent self-priming capability compared to swash-plate designs. The compact, robust bearing system ensures long service life even in demanding mobile machinery applications. Flow is proportional to drive speed and displacement, and can be infinitely varied by adjusting the bent axis angle.

Multiple models and configurations available. Send Model / Code / Nameplate

The A7VO series offers a wide variety of control devices to suit different application requirements:

Power controller (LR/LRD):
Maintains constant drive power by adjusting displacement based on working pressure
LRD adds pressure cut-off: when pressure reaches set point, pump reduces to minimum displacement
LRDS = special version for concrete pump truck boom control
Most common for: excavators, concrete pumps, cranes

Pressure controller (DR):
Limits maximum pressure at pump outlet within control range
Variable pump delivers only the hydraulic oil volume actually needed
When working pressure exceeds set point, pump adjusts toward smaller displacement
In unloaded state, pump returns to Vg max via return spring
Pressure setting range: 50-350 bar (standard setting: 350 bar)
Most common for: auxiliary hydraulic systems, hydraulic power units, press drives

Hydraulic pilot control (HD1/HD2):
Displacement proportional to pilot pressure applied at control port
HD1: Δp = 10 bar (standard); HD2: Δp = 25 bar (reinforced)
G suffix: with integrated pressure control
Most common for: automated systems, mobile machinery with pilot circuits

Electric proportional control (EP/EPG):
Displacement proportional to control current (12V or 24V solenoid)
Enables precise remote flow adjustment via electronic control system
G suffix: with integrated pressure control
Most common for: intelligent machinery, computer-controlled systems

Please specify your required control type when ordering. Different control types are not interchangeable.

The A7VO series is widely used across multiple industries:

Construction Machinery: • Excavator main pumps and auxiliary pumps — sizes 28-107 • Concrete pump truck boom pumps — size 55 (LRDS control), sizes 80-160 • Wheel loader hydraulic systems — sizes 80-160 • Mobile crane hydraulic systems — sizes 55-160

Drilling & Foundation Equipment: • Rotary drilling rig power head and winch drive pumps — sizes 80-160 • Foundation drilling equipment — sizes 107-160 • Micro-piling rig hydraulic systems — sizes 28-55

Road Construction: • Asphalt paver travel and screw drive pumps — sizes 55-107 • Cold milling machine hydraulic systems — sizes 80-160 • Road roller hydraulic systems — sizes 55-107

Agricultural Machinery: • Large tractor hydraulic systems — sizes 55-107 • Combine harvester drive systems — sizes 55-107 • Self-propelled sprayer hydraulic systems — sizes 28-55

Material Handling: • Forklift and telehandler hydraulic systems — sizes 28-80 • Reach stacker drive systems — sizes 80-160 Marine & Offshore: • Deck crane hydraulic systems — sizes 107-250 • Winch drive pumps — sizes 80-160 • Marine hydraulic power units — sizes 55-250

Industrial Equipment: • Hydraulic press drive pumps — sizes 107-500 • Injection molding machine pumps — sizes 80-160 • Test stand and RIG hydraulic systems — sizes 28-107

Equipment Types: Excavators, concrete pump trucks, drilling rigs, mobile cranes, wheel loaders, road rollers, asphalt pavers, combine harvesters, marine deck equipment, hydraulic presses, injection molding machines.

Typical model codes by application: • Mini excavator main pump: A7VO28DR/63R-VPB01 • Concrete pump truck boom pump:A7VO55LRDS/63L-NZB01-S • Excavator main pump: A7VO80LRDH1/63R-NZB01 • Drilling rig power head: A7VO107HD2/63R-NZB01 • Wheel loader pump: A7VO107LRG/63L-PPB01 • Concrete mixer drum drive: A7VO55EP/63R-DZB01

Each H-STAR A7VO pump undergoes the following quality processes:

• Dimensional Inspection: CMM (Coordinate Measuring Machine) verification of cylinder bore precision, piston diameter, valve plate flatness, and bent-axis angle per Rexroth tolerances
• Surface Hardness Testing: Piston and slipper surface hardness verified (HRC 58-62 for piston, HRC 55-60 for slipper plate)
• Bearing Inspection: Tapered roller bearing clearance and preload verified per specification
• Assembly Clearance Check: Piston-to-bore clearance (0.015-0.025 mm) and slipper-to-swashplate contact verified
• Pressure Testing: Post-assembly pressure test at nominal pressure (350 bar) for 15 minutes to verify sealing, internal leakage, and performance
• Cleanliness Control: All components cleaned and packaged to ISO 4406 cleanliness standard (20/18/15)
• Run-in Test: Low-speed run-in at 500 rpm for 10 minutes to verify smooth operation and noise level

Factory Capability: CNC machining center, hydraulic test bench (up to 500 bar), Mitutoyo CMM precision measurement, surface roughness tester.

QC – Quality Assurance

How we ensure you receive high‑quality products:

1.World‑class manufacturing equipment – We use advanced international machinery for production, testing, and inspection at every stage, ensuring consistent precision and reliability.

2.Two‑step quality control – We conduct a thorough finished‑product inspection followed by a pre‑shipment check, adding an extra layer of protection to guarantee that only defect‑free items reach you.

3.Certified quality management – Our manufacturing processes for hydraulic components and construction machinery parts are backed by ISO 9001:2015 certification. This internationally recognized standard ensures that our quality management system meets rigorous requirements for consistency, traceability, and continuous improvement. We also comply with ISO 14001environmental management) and ISO 45001 (occupational health and safety) standards where applicable. Additionally, our quality control system is supported by a computer‑integrated Quality Management Information System (IQS) to enhance inspection accuracy and process traceability

Why Choose H-STAR?

Guangzhou Huasheng Construction Machinery Co., Ltd. specializes in aftermarket hydraulic replacement parts compatible with Danfoss, Parker, Rexroth, Vickers, Hawe, and Kawasaki series. With 3+ years on Alibaba.com, 95.7% on-time delivery rate, and response time within 2 hours, we serve customers across South America, Oceania, and the Middle East.
Our Capabilities: • CNC machining center for precision component manufacturing • Hydraulic test bench (up to 500 bar) for performance verification • CMM (Coordinate Measuring Machine) for dimensional inspection • ISO 4406 cleanliness control for hydraulic component packaging • Complete A4VG series supply: sizes 28-250 cc/rev, all control types, all configurations

Customer Reviews: from 33 verified buyers — including repeat customers from Brazil, Venezuela, and Australia.

Send your pump nameplate photo or model code to get an accurate quote within 2 hours.

RFQ

Q: What is the warranty?

A: 12 months from delivery date against manufacturing defects under normal operating conditions.

Q: What's the package?

A. We usually packed by standard exported box or carton. And we can pack as your requirement.

Q: When weship out?

A: In 1-2 days if in stock.

Q: Which shipping term you can supply?

A:By sea, air or by express ( DHL, FedEx, TNT,UPS,EMS ...)

Q: How long does it take to my address?

A:The Normal delivery time is 3-7 days, depending on which country you are in.

Q:How can I trace my order?

A:We will send you the tracking number after we send the goods.

Q: What's brand you can offer?
A:OEM,original, aftermarket

Q. If I only know the model, but can not offer parts No., what should I do ?

A. If possible, you can send us pictures of old products, nameplate or the size for reference.