Rexroth A20VO520 High-Pressure Variable Axial Piston Double Pump

When you're specifying a hydraulic system for heavy-duty mobile machinery—think excavators, wheel loaders, or concrete pump trucks—every component must justify its place on the bill of materials. The Rexroth A20VO520 isn't just another pump; it's a high-pressure, variable axial piston double pump engineered for machines where power density and fuel efficiency directly impact the bottom line.

Key Design Philosophy

High pressure capability: Rated for continuous operation up to 350 bar (5,076 psi), with peak pressures reaching 400 bar (5,800 psi).

Variable displacement: Swashplate design allows flow control from near zero to maximum, reducing parasitic losses.

Through-drive versatility: Can mount additional pumps (gear or piston) on the rear, optimizing engine real estate.

The double-pump configuration is critical for load-sensing hydraulic systems, where one section may power travel drives while the second handles implements—all without a separate pump divider.

Swashplate Control Options

Rexroth offers multiple control variants, but the most common for high-pressure double pumps are:

LR (Load sensing + pressure limiting): Ideal for variable flow/pressure demands (e.g., breaker circuits).

EP (Electro-hydraulic proportional) : Enables direct electronic displacement control via a machine's PLC or joystick interface.

HD (Hydraulic pilot control) : Used in open-loop mobile systems where simplicity and robustness are paramount.

Installation & Maintenance Best Practices

Expert users know that the A20VO520 is reliable only if you respect three rules:

1.Suction condition: Keep inlet pressure above 0.8 bar absolute. Use a properly sized suction strainer (200 µm max).

2.Case drain routing: Each pump section has its own case drain line. Never tee them together—backpressure above 2 bar will damage the shaft seal.

3.First start-up: Fill both housings via the top plug. Running a dry axial piston pump even for 10 seconds ruins the brass slippers.

For more information on the A20VO520 hydraulic pump, please visit https://www.baolilaihydraulic.com/product/.

Specifications

Selection Table

Q1: My pump shows intermittent flow drop at high temperature. What’s likely wrong?

A1: Most often, the swashplate servo piston’s filter screen (located in the control valve block) is clogged. Second suspect: the suction strainer is partially blocked, causing cavitation that the load-sensing compensator misinterprets as low demand.

Q2:How do I identify whether I have an A20VO520 with LR or EP control without looking at the nameplate?

A2: The LR control has a small stamped steel cover with four M6 screws on the pump’s regulator block. The EP control has a molded connector (DEUTSCH DT or AMP) and two small solenoid valves visible externally.

Q3:How to purchase an A20VO520 hydraulic pump?

A3:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.

Q4:What is the price and delivery time of the A20VO520 hydraulic pump?

A4:The specific price and delivery time will be provided based on the specific model you provide.