Rexroth A4VG90EP Hydraulic Piston Pump with Electro-Proportional Control for Pavers Rollers Mobile Machinery

Product Overview:
The A4VG90EP is a high-performance swashplate design axial piston pump from the renowned Rexroth A4VG series. Specifically engineered for closed-circuit hydrostatic transmissions, this variable pump delivers exceptional power density, reliable operation, and precise electronic control under extreme loads . With a displacement of 90 cm³/rev and advanced EP electro-proportional control, it provides stepless, infinitely variable flow adjustment for demanding mobile applications. The built-in charge pump ensures reliable boost and pilot oil supply, while the swashplate design allows for smooth flow direction changes as it moves through neutral . This unit is a direct, high-quality replacement solution for original Rexroth equipment.

Technical Specifications:

Core Features:

• Closed-Circuit Design with Integrated Charge Pump: Specifically engineered for hydrostatic transmissions, featuring an integrated boost pump that ensures reliable boost and pilot oil supply for smooth operation . Maximum charge pressure is limited by a built-in boost pressure relief valve .

• EP Electro-Proportional Control: Advanced electronic control provides stepless, infinitely variable displacement adjustment proportional to the input current (24 V solenoid with ±20% tolerance). This allows for precise speed control and smooth acceleration/deceleration . The EP control enables variable speed and direction changes with high responsiveness .

• High-Pressure Capability: Delivers 400 bar nominal and 450 bar peak pressure, meeting the most demanding mobile and industrial application requirements .

• Smooth Flow Reversal: The swashplate design allows for seamless changes in flow direction as it moves through the neutral position, enhancing operational efficiency and control .

• Integrated Safety Valves: High-pressure relief valves with an integrated boost function protect against pressure spikes, while an adjustable pressure cutoff comes standard for additional system protection .

• Through-Drive Capability: 100% through-drive allows mounting of additional pumps up to the same nominal size, enabling flexible multi-circuit system configurations .

• High Power Density: Delivers up to 183 kW of power at 5800 psi, providing exceptional power-to-weight ratio for demanding applications .

• Durability: Robust cast iron construction and optimized internal clearances ensure long service life in demanding continuous operation .

Main Applications (Suitable Equipment):
The A4VG90EP is the specialized power unit for machinery requiring precise closed-circuit hydrostatic drives. It is extensively used in:

1. Road Construction Machinery:

• Asphalt pavers - main travel drive 

• Road rollers and compaction equipment - hydrostatic travel drives

• Milling machines and cold planers

• Vögele, Dynapac, Bomag, and Caterpillar paver applications

2. Mobile Machinery:

• Wheel loaders and skid steer loaders - hydrostatic fan drives and auxiliary functions

• Concrete pump trucks - closed-circuit systems 

• Heavy-duty hydraulic flatbed vehicles 

• Agricultural machinery - self-propelled sprayers and harvesters

3. Industrial & Manufacturing Equipment:

• Hydraulic presses requiring precise pressure and flow control 

• Injection molding machines - closed-loop hydraulic systems 

• Test stands and automation systems

4. Construction & Earthmoving:

• Excavators - swing drives and auxiliary functions

• Track loaders and crawler dozers

• Drilling rigs and foundation equipment

5. Marine & Offshore Applications:

• Marine hydraulic systems - winch drives and deck machinery

• Offshore equipment requiring reliable closed-circuit hydraulics

6. Specialty Applications:

• Sweepers and municipal vehicles 

• Wind turbine hydraulic systems - pitch and yaw control 

• Forestry equipment and harvesters