Rexroth A11VLO260 A10VO28 Tandem Hydraulic Pump for SANY Zoomlion Concrete Pump Truck

Product Overview:
The A11VLO260 + A10VO28 is a high-performance tandem (dual) swashplate design axial piston pump combination from the renowned Rexroth A11VLO and A10VO series . Specifically engineered for open circuit hydraulic systems, this dual-pump configuration is widely recognized as the standard hydraulic power unit for concrete pump trucks and heavy construction equipment . With a primary pump displacement of 260 cm³/rev and a secondary pump displacement of 28 cm³/rev, it provides independent, high-efficiency hydraulic power for main and auxiliary functions . This unit is a direct, high-quality replacement solution for original Rexroth equipment.

Technical Specifications:

• Model Combination: A11VLO260 + A10VO28 (Tandem configuration) 

• Type: Swashplate design, variable axial piston pumps (Dual / Tandem)

• Displacement (Primary - A11VLO260): 260 cm³/rev (steplessly variable from Vg max to Vg min = 0) 

• Displacement (Secondary - A10VO28): 28 cm³/rev

• Nominal Pressure: 350 bar (continuous operation) 

• Maximum Pressure: 400 bar (peak); up to 480 bar depending on control type 

• Control Options (A11VLO260): LRDS, LRDU2, DRS, EP, HD (Various combinations for power, pressure, and load sensing control) 

• Control Options (A10VO28): DR (Constant pressure control)

• Design: For open circuit hydraulic systems with through-drive configuration 

• Mounting Flange: SAE / ISO 3019-1 standard 

• Material: Robust cast iron construction for durability and heat resistance 

• Application Focus: Concrete pump trucks, excavators, mining machinery 

Core Features:

• Industry-Standard Tandem Configuration: This specific combination (A11VLO260 + A10VO28) is the proven hydraulic power unit for large concrete pump trucks, providing independent hydraulic power for main pumping and boom control functions from a single drive source .

• A11VLO260 - High-Power Main Pump: Features a 260 cc/rev displacement with 350 bar nominal pressure capability (peak up to 480 bar), delivering massive hydraulic flow for primary machine functions like concrete pumping . Includes 100% through-drive capability for mounting additional pumps .

• A10VO28 - Constant Pressure Pilot Pump: Secondary pump with DR constant pressure control maintains stable pressure for pilot and control functions, ensuring precise operation of the main pump and system valves.

• Stepless Variable Displacement: Output flow is infinitely variable between Vg max and Vg min = 0, offering precise flow matching to reduce energy consumption and heat generation .

• Flexible Installation Options: Operates under self-priming conditions, with tank pressurization, or with optional built-in charge pump (impeller) for enhanced suction performance .

• Durability: Robust bearing system and high-quality cast iron materials ensure long service life in demanding continuous operation. Cast iron construction provides 30% higher load-bearing capacity than aluminum alternatives .

• Low Noise Operation: Optimized design ensures low noise levels during operation (as low as 78 dBA in advanced models), making it suitable for urban construction sites .

• High Efficiency: Volumetric efficiency up to 95% minimizes energy loss and reduces operating costs .

Main Applications (Suitable Equipment):
The A11VLO260 + A10VO28 tandem pump combination is the specialized power unit for heavy machinery requiring high-pressure, variable flow hydraulics. It is extensively used in:

1. Concrete Pump Trucks (Primary Application):

• Main hydraulic pump for large concrete pump trucks (37m-56m boom pump trucks) 

• SANY, Zoomlion, Putzmeister, and Schwing concrete pump trucks - standard main pump configuration 

• Truck-mounted concrete pumpsand stationary concrete pumps

• Concrete placing booms and line pumps

2. Excavators & Construction Machinery:

• Main hydraulic pump for large excavators (30-50 ton class) 

• Material handlers and crawler excavators

• Rotary drilling rigs 

3. Mining & Heavy Industry:

• Mining machinery and continuous-duty operations in harsh mining environments 

• Heavy industrial machinery and presses 

• Metallurgical equipment and steel mill machinery

4. Crane & Heavy Lifting Equipment:

• Mobile cranes and crawler cranes 

• Marine cranes and winches in shipyard and offshore applications 

5. Industrial Applications:

• Hydraulic power units for heavy industry

• Injection molding machines requiring high-pressure hydraulics 

• Energy sector equipment (oil & gas drilling rigs, wind turbine pitch control)