A4VG Series Hydraulic pump
4 month ago
Product details
A4VG Series Hydraulic Piston Pump
TheA4VG Series Hydraulic Piston Pump, manufactured by Bosch Rexroth, is a swashplate-type axial piston variable displacement pump widely used in closed-loop hydrostatic transmission systems. Below is detailed information about this series:
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I. Key Features
1. Swashplate Design
• Utilizes a swashplate mechanism to achieve stepless flow adjustment by varying the swashplate angle.
2. High-Pressure Performance
• Rated operating pressure: Up to40 MPa (400 bar)
• Maximum pressure: Up to45 MPa (450 bar), meeting the demands of high-pressure hydraulic systems.
3. Flow Adjustment
• Output flow is proportional to drive speed and displacement, enabling stepless variable flow. Flow increases with swashplate angle.
4. Smooth Direction Reversal
• When the swashplate passes through the neutral position, the hydraulic fluid flow direction changes smoothly, reducing system shock.
5. Diverse Control Options
• Supports multiple control methods:
• HD (Hydraulic Control)
• HW (Hydraulic Control with Manual Servo)
• DA (Speed-Dependent Hydraulic Control)
• EP (Electro-Proportional Control)
6. Integrated Charge Pump
• Built-in charge pump provides makeup and control oil, reducing external piping and minimizing leakage risks.
7. Protection Functions
• Equipped with a high-pressure relief valve and pressure cutoff valve to prevent system overload and energy waste.
8. High Power Density
• Compact structure, lightweight design, and small footprint with a high power-to-weight ratio.
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II. Applications
The A4VG series is widely used in industrial and mobile hydraulic systems, including:
1. Construction Machinery
• Concrete mixers, excavators, loaders, road rollers, etc.
2. Agricultural & Forestry Machinery
• Combine harvesters, tractors, logging equipment, etc.
3. Road Machinery
• Pavers, milling machines, etc.
4. Lifting Equipment
• Truck cranes, crawler cranes, etc.
5. Industrial Equipment
• Metallurgical machinery, mining machinery, marine equipment, forging presses, etc.
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III. Technical Specifications
• Displacement Options:
• 28, 40, 56, 71, 90, 125, 180, 250 mL/r (customizable for specific needs).
• Speed Range:
• Maximum allowable speed depends on displacement (e.g.,2400–4250 rpmfor displacements of 28–250 mL/r).
• Control Methods:
• SupportsHD, HW, HT, DA, EP, and other control options for flexible system integration.
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IV. Installation & Maintenance
1. Installation Requirements
• Use a flexible coupling between the prime mover and pump drive shaft, ensuring coaxiality ≤0.05 mm.
• Install the pump below the tank level, with suction line inner diameter ≥ pump inlet diameter.
• Maintain a minimum suction pressure of≥0.8 bar (absolute)at the suction port (S).
2. Maintenance Guidelines
• Regularly check hydraulic oil cleanliness and level; replace oil and filters as needed.
• Inspect seals and pipe connections for leaks.
• Monitor pump operation (noise, vibration, temperature) and address abnormalities promptly.
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V. Commissioning & Troubleshooting
1. Commissioning Steps
• Verify pump model, specifications, and mounting against design drawings.
• Connect all pipes and fittings securely.
• Clean the tank and pipes, then fill with clean hydraulic oil.
• Start the pump at idle speed; check for leaks or abnormal noise.
• Gradually increase speed to rated RPM; verify pressure and temperature meet requirements.
• Adjust parameters (e.g., charge pressure, mechanical/hydraulic zero position, safety valve, cutoff pressure) as needed.
2. Common Faults & Solutions
• Abnormal Pump Noise
• Causes: Worn bearings, piston damage, swashplate wear.
• Solution: Inspect and replace damaged components.
• Pressure/Flow Irregularities
• Causes: Insufficient charge pressure, control valve failure, system leaks.
• Solution: Check and repair components step-by-step.
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