Rexroth A20VLO double hydraulic pump for Sennebogen Equipment 104891 153608 114613 53643 114612 077129 074638

Sennebogen builds heavy equipment that thrives in brutal environments. Whether it's the 825M material handler sorting scrap or the 5500 crawler crane lifting concrete panels, these machines demand hydraulic systems that can handle continuous cycling without overheating or losing pressure. The Rexroth A20VLO meets that challenge head-on.

Key Design Features That Matter

The A20VLO is a variable-displacement, axial-piston pump designed for open-loop circuits. Here's what sets it apart:

Tandem configuration: Two independent pumping sections share a common drive shaft, allowing you to power separate hydraulic circuits (e.g., swing and travel) from a single unit.

High volumetric efficiency: Patented slipper retention and hardened cylinder blocks minimize internal leakage even at extreme pressures up to 350 bar (5,075 psi).

Compact footprint: Despite its dual-section design, the A20VLO fits into tight engine compartments typical of Sennebogen's mid-to-large series.

Integrated charge pump: An optional built-in gear pump supports closed-loop fan drives or pilot control circuits without external plumbing.

Installation and Integration Considerations

Dropping in an A20VLO isn't always plug-and-play. Here's what experienced technicians check first:

Mounting and Alignment

Sennebogen typically mounts the pump directly to the engine flywheel housing via a SAE-B or SAE-C flange pattern. The A20VLO uses a two-bolt mount with optional splined or keyed shaft ends. If you're retrofitting from an older pump model, verify:

Shaft diameter: Common sizes include 1.25″ (31.75 mm) and 1.375″ (34.93 mm).

Pilot diameter: Must match the engine bellhousing precisely to prevent misalignment-induced bearing wear.

Hydraulic Circuit Compatibility

Most Sennebogen models run ISO VG 46 or VG 68 hydraulic oil. The A20VLO's internal clearances are optimized for these viscosities. However, if your machine operates in extreme cold (below -10°C / 14°F), consider using a lower-viscosity grade or installing a thermostatic bypass valve to protect the pump during warm-up.

Maintenance and Troubleshooting Tips

Even the best pumps need care. Here's how to keep your A20VLO running strong:

Routine Checks

Case drain filter: Replace every 500 hours. Clogged filters cause backpressure that blows shaft seals.

Charge pressure test: Should read 18–25 bar (260–360 psi) at idle. Low charge pressure indicates worn charge pump gears or a blocked suction screen.

Oil sample analysis: Send samples to a lab every 1,000 hours. Look for elevated silicon (dirt ingress) or copper (bearing wear).

For more brand and equipment models, please visit https://www.baolilaihydraulic.com/brand/.

Q1: What’s the expected lifespan of this pump under normal conditions?

A1: In well-maintained Sennebogen equipment, expect 8,000–12,000 hours before needing a major overhaul. Factors such as oil cleanliness and duty cycle significantly impact longevity.

Q2: Does the A20VLO work with bio-hydraulic oils?​

A2: Yes, provided you specify the correct seal material (FKM/Viton). Standard NBR seals degrade quickly in ester-based fluids.

Q3:What is the price and delivery time of the Rexroth A20VLO pump for Sennebogen Equipment？

A3: The specific price and delivery time will depend on the equipment model or specific product model you provide.

Q4:How to purchase an A20VLO hydraulic pump for Sennebogen Equipment?

A4:You can visit https://www.baolilaihydraulic.com/contact/ to contact us and purchase our products through various methods.