Rexroth A20VLO190LG1S5 Tandem Axial Piston Variable Double Pump
1. Model Code Explanation
A20VLO series is Rexroth through-shaft swashplate tandem variable piston pump designed for open hydraulic circuits, with mature core components inherited from the A11V platform:
- A20VLO : Coaxial dual-pump tandem structure for open-loop heavy-duty variable operation
- 190 : Nominal displacement of 190 mL/r per single pump unit with independent oil output
- LG1 : LR constant-power control mode + standard mounting flange, with adjustable power threshold on site
- S5 : Standard shaft seal, general port layout with no customized modifications
A20VLO190LG1S5 Hydraulic Piston Pump is a heavy-duty variable displacement axial piston hydraulic pump. As core power source of the open-circuit hydraulic system, this twin rotary-group Hydraulic piston pump adopts back-to-back swashplate double pump design. Integrated with built-in charge pump structure, this hydraulic pump converts rotational mechanical power into high-pressure hydraulic energy. It provides stable and adjustable flow output for heavy-duty equipment, optimizes power matching of the whole hydraulic system, and delivers reliable driving force under continuous heavy-load working conditions.
2. Core Technical Parameters
Parameter Specification
Structure Coaxial dual axial piston variable tandem pump
Single-section Displacement 190 mL/r, dual independent flow outlets
Continuous Rated Pressure 35 MPa (350 bar)
Peak Shock Pressure 45 MPa (450 bar)
Max Regular Speed 2500 rpm
Control Mode LG1 constant power & load sensing control
Mounting Standard SAE through-shaft flange, compatible with rear auxiliary pump installation
Recommended Fluid ISO VG46 anti-wear hydraulic oil
Operating Temperature -20℃ ~ 90℃
Oil Supply Modes Self-priming, pressurized tank feed, built-in charge pump available
3. Working Principle
The engine drives the shared through shaft to rotate two piston cartridges synchronously. The swashplate adjusts its angle automatically by load variation: larger displacement delivers high-pressure oil under heavy torque loads, while smaller displacement cuts power loss at idle. Two separate outlets feed travel and working hydraulic loops respectively. Constant-power control caps total input power to avoid engine overload; the reserved rear interface allows tandem mounting of gear pumps or small piston pumps for extra circuits.
4. Key Advantages
1. Compact integrated tandem layout saves engine compartment space and simplifies hydraulic piping.
2. Tunable LG1 constant-power control adapts to fluctuating heavy loads for different operation intensities.
3. Proven friction pairs from the A11V line deliver strong vibration & wear resistance for mining and construction sites.
4. Extendable through-shaft design supports auxiliary pump stacking for multi-loop demands.
5. Standardized mounting dimensions enable direct aftermarket replacement to shorten equipment downtime.
5. Typical Applications
Large excavators, rotary drilling rigs, concrete mixers, heavy loaders, mining rock drills and other heavy mobile machinery with dual independent hydraulic circuits; also used as power units for large industrial hydraulic stations.
