A7V20LV1LPGOO Rexroth A7V Bent Axis Piston Pump 350 Bar

Product Overview

Technical Specifications

• Core Model: A7V20LV1LPGOO
• Pump Design: Bent-axis axial piston variable pump, hydrostatic transmission for open circuits
• Geometric Displacement: 20.5 mL/r
• Rated Working Pressure: 35 MPa (350 bar)
• Peak Working Pressure: 40 MPa (400 bar)
• Maximum Operating Speed (at full displacement): 3000 rpm
• Control Mode: LV type constant power variable control
• Rotation Direction: Counterclockwise (viewed from drive shaft end)
• Shaft Extension: Keyed shaft
• Full series displacement range:
  • A7V58: 58.8 mL/r
  • A7V78: 78 mL/r
  • A7V80: 80 mL/r
  • A7V107: 107 mL/r
  • A7V250: 250 mL/r
• Compatible Fluid: Anti-wear mineral hydraulic oil, fire-resistant hydraulic fluid
• Ambient Temperature Range: -25℃ to +80℃

Key Technical Advantages

1. Spherical Valve Plate Bent-axis Design with High Volumetric Efficiency

   The spherical valve plate achieves automatic alignment during operation, reducing friction pair wear and internal leakage. The tapered piston and cylinder block structure delivers uniform contact stress distribution, achieving volumetric efficiency above 94% under rated conditions. It features superior mechanical efficiency and better low-temperature starting performance than equivalent swash-plate pumps.

2. Constant Power Control for Optimal Power Matching

   The LV constant power variable mechanism adjusts displacement automatically according to system pressure, precisely matching pump output power with prime mover power to avoid engine overload. It increases flow under light load and reduces flow under heavy load, making full use of prime mover power to improve overall operating efficiency and reduce fuel & energy costs.

3. Heavy-Duty Bearing Configuration for Extended Service Life

   High-precision tapered roller bearings support the drive shaft, withstanding heavy radial and axial impact loads. The hydrostatic unloading structure effectively reduces bearing contact load under high-pressure conditions. The drive shaft is made of alloy structural steel with carburizing and quenching treatment, reaching surface hardness of HRC58-62 with excellent fatigue resistance, significantly prolonging the pump service life.

4. Micron-level Precision Machining & 100% Direct Interchangeability

   Core friction pairs including cylinder bore, piston slipper and valve plate are processed with CNC honing and super-finish grinding, with dimensional tolerance controlled at micron level. The mounting interface, port dimensions and connection size fully replicate original drawings, enabling direct replacement of original Rexroth A7V series pumps without pipeline or bracket modification, greatly reducing equipment downtime.

5. Full Working Condition Factory Testing for Stable Reliability

   Each pump passes 100% simulated bench test before delivery, including rated pressure holding, peak pressure shock, high and low speed cycle, and oil temperature rise verification. It operates stably over a wide temperature range, adapts to complex field working environments and effectively reduces on-site failure risk.

Application Areas

• Construction machinery: Hydraulic power systems for excavators, loaders, bulldozers, crawler cranes and other mobile equipment
• Metallurgical equipment: High-pressure heavy-duty hydraulic systems for rolling mills, continuous casters and industrial hydraulic stations
• Mining machinery: Hydraulic units for roadheaders, coal mining machines and mine hoisting equipment under extreme working conditions
• Injection & die casting: Clamping and injection hydraulic systems for injection molding machines and die casting machines
• Marine & heavy industry: Hydraulic power systems for marine steering gears, deck machinery and heavy-duty machine tools

Expert Maintenance Tips

1. Installation Calibration Requirements

   Ensure the coaxiality error between the pump shaft and prime mover output shaft is ≤0.1mm during installation, to avoid premature wear of shaft seal and bearing caused by excessive radial force. Thoroughly clean the ports and flange surface before installation to prevent impurities such as iron filings and dust from entering the pump body. Fill the pump housing with clean hydraulic oil and exhaust air before first startup to avoid dry friction damage to the valve pair.

2. Hydraulic Oil Specifications

   High-quality anti-wear hydraulic oil compliant with ISO VG46 or VG68 is recommended, with oil cleanliness reaching NAS grade 8 or above. Ensure the suction pipeline is perfectly sealed to avoid air intake and cavitation. Normal operating oil temperature should be controlled between 30℃ and 70℃; long-term operation above 80℃ will accelerate seal aging and oil deterioration, and a cooling device is required for high-temperature working conditions.

3. Regular Maintenance Interval

   Check oil level and cleanliness every 500 working hours, and inspect pipeline leakage and loose connections. Replace hydraulic oil and return filter every 2000 working hours, and clean the suction filter and tank deposits at the same time. It is recommended to disassemble and inspect the wear condition of internal friction pairs and check bearing clearance every 4000 working hours to predict failure risks in advance.

4. Common Troubleshooting

   If output pressure is insufficient, first check whether the suction filter is clogged or the system relief valve setting is too low, then inspect the wear condition of the valve pair. If abnormal noise occurs, focus on checking whether oil is aerated or bearing is worn. Do not operate the pump with oil shortage or air intake for a long time, to avoid irreversible damage to the pump body.