Rexroth AA10VO28DR/31R Hydraulic Variable Axial Piston Pump A10VO28 for Mobile cranes

Product Overview:
The AA10VO28DR/31R is a high-performance swashplate design axial piston pump from the renowned Rexroth A10VO series. Specifically engineered for open circuit hydraulic systems, this variable pump delivers exceptional reliability, efficient operation, and precise pressure control under demanding conditions . With a displacement of 28 cm³/rev and advanced DR pressure control, it provides constant pressure regulation for a wide range of medium-pressure industrial and mobile applications . This unit is a direct, high-quality replacement solution for original Rexroth equipment, with material number R902481018 / R902504592 .

Technical Specifications:

• Model: AA10VO28DR/31R

• Type: Swashplate design, variable axial piston pump

• Displacement: 28 cm³/rev (steplessly variable) 

• Nominal Pressure: 280 bar (4000 psi continuous operation) 

• Maximum Pressure: 350 bar (5100 psi peak) 

• Maximum Speed: 3000 - 3600 rpm 

• Flow Rate: 50 - 84 L/min (depending on speed) 

• Power Rating: 24 - 39 kW 

• Control Type: DR - Pressure control (constant pressure system)

• Design: For open circuit hydraulic systems 

• Through-Drive: 100% through drive suitable for adding gear pumps and axial piston pumps up to the same nominal size 

• Mounting Flange: SAE 2-hole flange / ISO 3019-1 standard 

• Shaft Type: Splined (ANSI B92.1a standard) 

• Seal Material: FKM (Viton) 

• Weight: Approximately 14-15 kg 

• Material: Robust cast iron construction 

• Temperature Range: -20°C to +90°C

• Case Drain Ports: 2 connections for flexible system integration 

Core Features:

• Robust Swashplate Design: The proven swashplate design with cast iron construction ensures reliable operation, excellent efficiency (volumetric efficiency ~95%), and long service life in open circuit applications . The drive shaft can withstand both axial and radial loads.

• DR Pressure Control: Advanced pressure control maintains constant system pressure regardless of flow demand, providing precise pressure regulation for consistent machine operation .

• Stepless Variable Displacement: Flow is proportional to drive speed and displacement, adjustable steplessly from maximum down to zero via the swashplate angle, offering precise flow matching to reduce energy consumption and heat generation .

• Excellent Suction Characteristics: Superior self-priming performance ensures reliable operation even in demanding conditions and at higher speeds, minimizing cavitation risks .

• 100% Through-Drive Capability: Universal through-drive design allows mounting of additional pumps up to the same nominal size for multi-circuit systems, enabling flexible and space-saving system configurations .

• Low Noise Operation: Optimized design ensures low noise levels during operation, contributing to a more comfortable working environment and meeting stringent workplace noise regulations .

• Short Control Response Times: Controls with rapid response times ensure precise operations and better handling in dynamic system conditions .

• High Power-to-Weight Ratio: Compact construction delivers impressive power density in a lightweight 15 kg package .

• Durability: Robust bearing system and high-quality cast iron materials ensure long service life in demanding continuous operation, with MTBF exceeding 10,000 hours .

• Dual Case Drain Ports: Two case drain ports facilitate maintenance and fluid management within the hydraulic system .

Main Applications (Suitable Equipment):
The AA10VO28DR/31R is widely recognized as a versatile and reliable hydraulic power unit for medium-pressure applications requiring constant pressure control. It is extensively used in:

1. Concrete Pump Trucks (Primary Application):

• Main or auxiliary pump for concrete pump trucks - boom control systems 

• Truck-mounted concrete pumps and stationary concrete pumps

• Concrete placing booms and line pumps

• SANY, Zoomlion, and Putzmeister concrete pump applications 

2. Excavators & Construction Machinery:

• Small to medium excavators (6-12 ton class) - auxiliary pump functions

• Backhoe loaders and compact loaders

• Road rollers and compaction equipment

• Material handlers and crawler excavators

3. Material Handling Equipment:

• Forklifts (counterbalance and reach trucks)

• Telehandlers and rough-terrain forklifts

• Aerial work platforms (scissor lifts, boom lifts)

4. Industrial Machinery:

• Machine tools (hydraulic feed systems, clamping systems) 

• Injection molding machines - auxiliary functions 

• Hydraulic presses (C-frame, bench presses)

• General industrial hydraulic power units 

• Plastic machinery and blow molding equipment 

5. Agricultural Machinery:

• Tractors (auxiliary hydraulic functions)

• Harvesters and agricultural implements

6. Mining & Tunneling:

• Small mining equipment and rock drills - auxiliary systems

• Tunneling machinery auxiliary systems

7. Specialty Applications:

• Municipal vehicles and sweepers

• Lifting machinery and hoisting equipment

• Hydraulic systems for industrial automation