Rexroth A20VO A20VLO Series Double Piston Pump | A20VLO190LRDH1 Variable Displacement Pump

The A20VO and A20VLO Series double axial piston variable pumps from Chengyuan Hydraulic are premium hydraulic components fully compatible with Rexroth standards for industrial and mobile applications. Designed for open-circuit systems, these swashplate-design pumps provide two independent flow outputs from a single drive shaft, making them ideal for synchronized control in heavy machinery. For the core model A20VLO190LRDH1, we have optimized the swashplate mechanism to ensure exceptional performance at 350 bar continuous pressure. Every double pump undergoes 100% simulated dual-circuit balance testing before shipment to ensure performance parity with the original equipment, guaranteeing 100% original-place interchangeability.

Technical Specifications (A20VLO190):

• Pump Type: Double Axial Piston Variable Pump

• Displacement: 190 $cm^3/rev$ per pump (380cc total)

• Nominal Pressure: 350 bar (35 MPa)

• Peak Pressure: 400 bar (40 MPa)

• Max Speed: 2500 rpm (Suction mode)

• Control Mode: LRDH1 (Power control with hyd. stroke cutoff & remote pressure control)

• Direction of Rotation: R (Clockwise)

• Seal Material: FKM (Viton)

• Approx. Weight: 210 kg

Key Technical Advantages:

• High Power Density Double Design: Driving two independent piston groups through a single shaft saves mounting space and input costs. The dual-circuit design allows independent adjustment based on load requirements, ensuring precise power distribution.

• Integrated Impeller (A20VLO): The VLO version features an integrated charge pump (impeller), which significantly boosts suction speed. This prevents cavitation even at high altitudes or overspeed conditions, protecting the piston-cylinder interface.

• LRDH Precision Power Control: Equipped with an advanced power limiter (LR), it prevents engine stalling. The hydraulic cutoff (H) function rapidly reduces displacement once set pressure is reached, minimizing system heat and energy loss.

• Reinforced Rotating Components: Piston shoes and cylinder port plates feature specialized anti-wear coatings. Combined with oversized, long-life bearings, the design life is increased by over 20% in dusty and high-vibration environments.

Application Areas:

• Large Crawlers/Excavators: Primary hydraulic system for 40-60 ton class machines.

• Crawler Cranes: Synchronized driving of winch and swing mechanisms.

• Heavy Industrial Presses: Power source for extrusion presses or metal balers.

• Oil Drilling Rigs: Mud pump drives and rotary control for drilling equipment.

Expert Maintenance Tips

• Dual-Case Priming: Before the first start-up, fill both pump cases with clean hydraulic oil through the top bleed ports to ensure simultaneous lubrication of both piston groups.

• Case Pressure Management: The A20 series is sensitive to backpressure. Ensure the case drain line goes directly to the tank and pressure never exceeds 2 bar to avoid shaft seal failure or swashplate control issues.

• Suction Vacuum Check: Periodically inspect the suction filters. Excessive suction resistance leading to cavitation will rapidly damage the impeller in VLO models, resulting in total pump failure.