Rexroth A4VG Series Variable Displacement Axial Piston Pump
Guangdong Haozheng Hydraulic Equipment Co., Ltd. specializes in manufacturing high-efficiency, heavy-duty Rexroth A4VG series variable displacement axial piston pumps. Specifically engineered for hydrostatic transmissions in high-pressure closed-circuit configurations, the A4VG series features integrated boost (charge) pumps, high-pressure relief valves, and versatile control systems to deliver precision speed, direction, and torque variations for high-power drive systems.
As your trusted global B2B hydraulic supply specialist, Haozheng delivers complete A4VG pump assemblies and precision-machined internal rotary components with 100% dimensional and functional interchangeability with original Bosch Rexroth units. To withstand massive pressure impulses in heavy field operations and eliminate installation failure, every single unit undergoes comprehensive load diagnostics, response time testing, and leakage calibration on our advanced hydraulic test benches before global dispatch.
Technical Parameters & Model Selection Guide
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Design Type: Axial piston swashplate design, variable displacement
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Circuit Configuration: Closed Circuit
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Nominal Pressure: 400 Bar (40 MPa)
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Peak Pressure: 450 Bar (45 MPa)
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Displacements Available: 28 / 40 / 56 / 71 / 90 / 125 / 180 / 250 cc/rev
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Common Control Types: EP (Electric control with proportional solenoid) / HW (Hydraulic servo, proportional) / DA (Hydraulic control, speed-related) / DG (Hydraulic control, direct)
| Displacement (cc/rev) | Main Series Generations | Full Model Reference (A4VG Series) | Common Integrated Control Blocks |
| A4VG 28 | Series 32 / 40 | A4VG28EP3, A4VG28HW, A4VG28DG | Integrated Boost Pump & Relief Valves |
| A4VG 40 | Series 32 / 40 | A4VG40EP4, A4VG40HW, A4VG40DA | Integrated Boost Pump & Relief Valves |
| A4VG 56 | Series 32 / 40 | A4VG56EP2, A4VG56HW, A4VG56DA | High-Pressure Boost Circuit Integrated |
| A4VG 71 | Series 32 / 40 | A4VG71EP3, A4VG71HW, A4VG71DG | High-Pressure Boost Circuit Integrated |
| A4VG 90 | Series 32 / 40 | A4VG90EP3, A4VG90HW, A4VG90DA | Heavy-Duty Flow Control Integrated |
| A4VG 125 | Series 32 / 40 | A4VG125EP, A4VG125HW, A4VG125DA | Heavy-Duty Flow Control Integrated |
| A4VG 180 / 250 | Series 32 / 40 | A4VG180EP, A4VG250EP4, A4VG250HW | Super-Heavy Structural Support Blocks |
Engineered for High-Torque Transmissions & Heavy Mobile Machinery
Due to its enclosed fluid loops and high-pressure capacity, our A4VG series variable pumps are heavily relied upon to manage smooth, step-less power transmission in heavy-duty machinery:
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Heavy Infrastructure Engineering: The primary traction drive pump for asphalt pavers, tandem vibratory road rollers, rotary drilling rigs, and heavy concrete pumps.
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Agricultural Mega-Machinery: Managing hydrostatic wheel drives and main harvest cutting systems in large combine harvesters, silage cutters, and multi-purpose forestry equipment.
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Tunneling & Mining Equipment: Powering crawler tracks, tunneling shields, and heavy material transport loaders in underground mines and construction sites.
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Industrial & Marine Closed Loops: Driving heavy industrial winch systems, marine propulsion control sub-loops, and continuous high-torque industrial conveyor loops.
The Haozheng Advantage: High-Pressure Precision Machining & Dynamic Field Verification
Procuring your closed-loop heavy hydraulic machinery from Guangdong Haozheng Hydraulic Equipment Co., Ltd. ensures a top-tier B2B experience engineered for rugged durability:
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100% Drop-In Global Compatibility: Our full A4VG assemblies and high-precision replacement inner parts (including cylinders, pistons, control pistons, cradle bearings, valve plates, and integrated charge pumps) match Rexroth dimensional specs perfectly for effortless component repairs.
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Advanced Multi-Parameter Test Bench Calibration: Closed loop pumps cannot afford error. Every A4VG unit undergoes severe full-load dynamic performance mapping on our high-precision test benches to calibrate exact control valve pressure responses and rule out internal fluid slippage.
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Moisture-Proof Maritime Packing Seals: Because these heavy systems face long journeys, all high-pressure pumps are coated with premium anti-corrosion oils, shrink-sealed, and securely balanced inside standard export fumigation-free wooden cases.
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Reliable Stocking & Technical Consulting: We maintain an active backup of critical common displacements (such as A4VG56, A4VG71, and A4VG90) with diverse control valve configurations to shorten your operational lead times drastically.
Haozheng Hydraulic Production Processing Diagram
Haozheng Hydraulic Honorary Certificate
Exhibition
Frequently Asked Questions (FAQ)
Q1: What are the primary signs that an A4VG pump’s integrated charge pump requires attention? A: The integrated charge (boost) pump is critical for maintaining suction pressure in the closed loop and managing control valve movements. If you experience sluggish travel responses, unusual buzzing noises from cavitation, or a visible drop on your system’s low-pressure charge gauge, the charge pump or its relief valve may be worn out. Haozheng provides complete drop-in replacement charge pumps to resolve this fast.
Q2: Can I swap an A4VG pump configured with HW control to an EP electric control setup? A: While the underlying rotary and housing dimensions of the A4VG block remain matching, swapping the entire control method (e.g., from manual hydraulic servo HW to electronic proportional EP) requires changing the full integrated top control valve assembly, matching internal feedback links, and setting proper electrical current parameters. We recommend providing your full nameplate code to a Haozheng engineer to verify cross-control conversion.
Q3: What special fluid maintenance is required for a closed-circuit A4VG system compared to an open-circuit setup? A: Closed circuit loops reuse the same hydraulic fluid continuously within the core lines, making them extremely vulnerable to thermal buildup and concentrated particle contamination. You must strictly monitor system filtration, maintain the charge pump inlet filter, and completely flush the machine lines if a catastrophic mechanical component breakdown has previously occurred.
