Rexroth A20VO60 A20VLO Series Axial Piston Variable Pump

The A20VO / A20VLO series (including heavy-duty high-output frames such as A20VO60, A20VLO190, and A20VLO260) high-performance swashplate variable axial piston pumps manufactured by LIC Hydraulic—highlighting the precision engineering configurations AL-A20VO60DFR/10R-VSD24K68-SO969 and A20VLO190DRS/10R-NZD24K02-S—are premium, high-power-density rotary fluid power sources custom-developed for modern open-circuit mobile machinery and complex industrial drive networks. Conforming strictly to standardized SAE mounting orientations, high-torque splined input shafts, multi-pump tandem configuration patterns, and precise DFR/DRS regulatory control parameters, this comprehensive pump line delivers 100% drop-in interchangeability with Bosch Rexroth Series 10 A20VO and A20VLO variables piston pumps.

The A20VO/A20VLO architecture is specifically tailored to meet the demanding requirements for through-drive, multi-pump tandem integration within confined engine compartments or industrial power packs. The “AL” prefix in specific model configurations designates a optimized casing layout optimized for specialized multi-coupling or customized inlet routing. Under continuous high-pressure stress, frequent load-sensing flow modulations, or elevated self-priming velocities, standard hydraulic pumps are highly vulnerable to micro-fissures in the piston slippers, through-drive shaft torque fatigue, or boundary oil-film depletion on the valve face. LIC addresses these vulnerabilities by employing advanced metallurgical casting processes for internal housing flow tracks and upgrading shaft torsional resistance. Every single A20VO/A20VLO pump undergoes 100% full-load factory testing that simulates severe heavy machinery overloads and dynamic load-sensing response cycles prior to shipment. Maintaining exceptional volumetric efficiency and prolonged bearing operations under a continuous nominal pressure of 350 bar, our pumps offer a dependable procurement alternative for global B2B system integrators, heavy equipment builders, and aftermarket spare parts networks.

Technical Specifications

Accurate, catalog-verified technical engineering parameters in compliance with standard Bosch Rexroth A20VO / A20VLO series technical benchmarks:

• Product Series: A20VO / A20VLO Series Swashplate Variable Axial Piston Open-Circuit Pump Platform (Heavy-Duty Through-Drive Multi-Pump Series)

• Displacement Sizing Framework Categories:

  • A20VO60: Geometric nominal displacement of 60.0 cm³/rev.

  • A20VLO190: Geometric nominal displacement of 193.0 cm³/rev (“L” designates an integrated centrifugal priming impeller pump for elevated self-priming speed thresholds).

  • A20VLO260: Geometric nominal displacement of 260.0 cm³/rev (With integrated centrifugal priming impeller pump).

• Model Number Specification Code Breakdown (AL-A20VO60DFR/10R-VSD24K68-SO969):

  • AL: Specialized intake flow path / tandem multi-pump housing variant index.

  • A20VO: Core swashplate variable axial piston pump index for multi-pump open-circuit structures.

  • 60: 60.0 cm³/rev geometric displacement classification scale.

  • DFR: Dual-valve control system regulating pressure and flow (Load-Sensing control with pressure cut-off and flow matching).

  • 10: Design configuration structural series index 10.

  • R: Clockwise (CW) rotation orientation evaluated looking directly onto the shaft end.

  • V: Seal compound, heavy-duty Fluorocarbon (FKM) high-temperature elastomer setup.

  • S: Input drive shaft profile, standard high-torque SAE splined configuration.

  • D24: Mounting pattern and main service oil ports, SAE standard combined mounting flange layouts.

  • K68 / SO969: Customized through-drive rear adapter configuration index, designed to receive a second tandem pump or auxiliary gear pump.

• Model Number Specification Code Breakdown (A20VLO190DRS/10R-NZD24K02-S):

  • A20VLO: Variable piston pump series with an integrated centrifugal charging impeller pump to elevate self-priming capabilities at high velocities.

  • 190: Geometric nominal displacement classification scaling at 193.0 cm³/rev.

  • DRS: Single-stage pressure control block equipped with a remote pressure control port (Remote Pressure Control).

• Nominal Continuous Operating Pressure Limit: 350 bar (35 MPa / 5075 psi)

• Intermittent Maximum Peak Pressure: 400 bar (40 MPa / 5800 psi)

• Maximum Self-Priming Rotational Velocity Sizing Limits:

  • A20VO60: Maximum self-priming speed baseline roughly at 2500 rpm.

  • A20VLO190 (Impeller Charged): Maximum rated speed extended up to 2100 rpm due to internal active fluid charging.

• Net Individual Mass Weight: A20VO60 single unit frame approx. 48.0 kg (105.8 lbs); A20VLO190 frame execution approx. 110.0 kg (242.5 lbs).

Key Technical Advantages

• Precision Dynamic DFR Load-Sensing Control: The integrated DFR regulator continuously detects load pressure adjustments in external actuators. By maintaining a constant system differential pressure (Δp) of 14-22 bar, the pump matches output flow exactly to demand. This eliminates unnecessary relief valve bypass heating and increases energy efficiency by more than 30%.

• High-Torque Through-Drive Spline Matrix: The central drive shaft undergoes specialized induction hardening, enabling the internal through-drive spline to transfer 100% of the nominal input torque limit. This allows operators to couple a second equal-displacement piston pump or secondary gear pump in a tandem configuration without a distribution gearbox, enabling a highly compact multi-circuit setup.

• Centrifugal Impeller Technology for High Suction Velocities: Integrated into the A20VLO190 and A20VLO260 profiles, the centrifugal priming impeller generates positive pressure at the piston inlet. This design optimizes cylinder barrel filling, mitigates cavitation risks at high rotational speeds or low ambient pressures, and extends the maximum self-priming velocity threshold by over 20%.

• Heavy-Duty Oversized Tapered Roller Bearing Axis: To handle the combined eccentric radial and axial bending moments generated in multi-pump tandem arrays, LIC incorporates oversized tapered roller bearings with high dynamic load ratings. This bearing layout resists eccentric tipping forces under a continuous 350 bar load, preventing internal alignment faults or barrel-to-plate scuffing.

Application Areas

The A20VO60, A20VLO190, and A20VLO260 series pumps, with their through-drive tandem capabilities, load-sensing optimization, and high-speed self-priming ratings, serve as core fluid power units for high-output systems:

• Heavy Mobile Construction Machinery & Tracked Excavators: Primary high-pressure main multi-pump groups for large excavators, rotary drilling rigs, and high-volume concrete boom pumps.

• Heavy Crane Lift Systems & Bulk Container Handling Equipment: Main hoisting and luffing circuits for heavy crawler cranes, reach stackers, and rubber-tired gantry cranes (RTG).

• Heavy Industrial Fluid Power Units & Scrap Compaction Systems: Central power source for high-tonnage metal scrap shears, industrial waste compactors, and centralized industrial HPUs requiring multiple independent circuits from a single drive shaft.

• Specialized Mining Extraction Equipment & Underground Tunnelling Units: Driving core cutter-head circuits in underground mining headers and high-pressure sub-systems on oil-rig top drives.

Expert Maintenance Tips

• Verify Absolute Shaft Coaxial Alignment and Torque Thresholds During Tandem Coupling: When assembling a second pump onto the through-drive rear of an AL-A20VO60DFR unit, measure and align the shaft centers with a dial indicator to within 0.05 mm. Angular or radial misalignment will induce severe cyclic shear stresses on the internal through-drive spline, leading to premature spline stripping. Additionally, ensure the combined operating torque of all coupled pumps remains below the maximum allowable through-drive torque limit.

• Purge All Trapped Air From the Charging Impeller Cavity Prior to Initial Activation: For the A20VLO190 and A20VLO260 impeller-charged models, fill the case cavity via the drain port, and loosen the bleed plug on top of the suction flange to evacuate trapped air pockets. If an air lock remains inside the centrifugal impeller housing, the component cannot establish positive inlet pressure, which can cause micro-cavitation and damage the piston rotating groups upon startup.

• Monitor LS Signal Line Integrity to Prevent Control System Instability: The DFR load-sensing control relies on accurate pressure feedback via the Load-Sensing (LS) pilot line. This pilot line should utilize rigid or high-pressure micro-bore tubing kept under 2 meters in length. Excessive line length or particulate contamination in the LS circuit can delay the feedback signal, causing high-frequency pressure oscillations (hunting) that accelerate wear on the swashplate servo assembly.