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A7VO55LRDS
Product Overview:
The A7VO55LRDS is a high-performance bent-axis design axial piston pump from the renowned Rexroth A7VO series. Specifically engineered for open circuit hydraulic systems, this variable pump delivers exceptional power density, reliable operation, and precise control under extreme loads . With a displacement of 55 cm³/rev and the advanced LRDS combined control (pressure/flow/power control), it provides stepless, energy-efficient flow adjustment for demanding mobile and industrial applications . This unit is a direct, high-quality replacement solution for original Rexroth equipment.
Technical Specifications:
| Parameter | Value |
|---|---|
| Model | A7VO55LRDS |
| Type | Bent-axis design, variable axial piston pump |
| Displacement | 55 cm³/rev (steplessly variable) |
| Nominal Pressure | 350 bar (5000 psi) |
| Maximum Pressure | 400 bar (5800 psi) |
| Rated Speed | 2700 rpm |
| Maximum Speed | 3000 rpm |
| Flow Rate | Up to 150 L/min |
| Control Type | LRDS - Combined pressure/flow/power control (load sensing + pressure cutoff + power limiter) |
| Design | For open circuit hydraulic systems |
| Through-Drive | 100% through-drive for mounting additional pumps |
| Mounting Flange | SAE / ISO 3019-1 standard |
| Weight | Approximately 35-40 kg |
| Material | Robust cast iron construction |
Core Features:
Bent-Axis Design: The robust angled shaft and conical piston design ensure high efficiency (volumetric efficiency up to 95%), excellent starting characteristics, and resilience against shock loads. The drive shaft can withstand radial loads .
LRDS Power Control: Advanced combined control automatically adjusts pump displacement based on system demand—providing load sensing for flow control, pressure cutoff for system protection, and power limiting to prevent engine overload. Power control is externally adjustable, even when the pump is running .
Stepless Variable Displacement: Flow is proportional to drive speed and displacement, adjustable steplessly from maximum down to zero, offering precise flow matching to reduce energy consumption and heat generation .
High-Pressure Capability: Delivers 350 bar continuous and 400 bar peak pressure, meeting the most demanding mobile and industrial application requirements .
Through-Drive Capability: 100% through-drive allows mounting of additional pumps for multi-circuit systems, enabling flexible and space-saving system configurations .
Excellent Suction Characteristics: Optimized port plate design ensures excellent self-priming performance even at higher speeds, minimizing cavitation risks .
Durability: Compact, robust bearing system engineered for long service life in demanding continuous operation .
Low Noise Operation: Optimized design ensures low noise levels during operation, contributing to a more comfortable working environment .
Main Applications (Suitable Equipment):
The A7VO55LRDS is widely recognized as the specialized power unit for concrete machinery and various heavy equipment. It is extensively used in:
Concrete Machinery (Primary Application):
Boom pumps for concrete pump trucks (SANY, Zoomlion, Putzmeister)
Concrete placing booms and line pumps
Concrete mixing plant hydraulics
Construction Machinery:
Medium excavators - main pump functions
Wheel loaders and backhoe loaders
Road rollers and compaction equipment
Mining & Tunneling Machinery:
Mining machinery and rock drilling rigs
Roadheaders and tunnel boring machines (TBM)
Industrial Machinery:
Hydraulic presses and forging equipment
Injection molding machines - main hydraulic power
Metallurgical equipment and steel mill machinery
Crane & Lifting Equipment:
Mobile cranes and crawler cranes
Aerial work platforms and material handlers