Rexroth excavator 0511 series gear pump
Rexroth Excavator 0511 Series Gear Pump
The Rexroth 0511 Series Gear Pump is a high-performance internal gear pump specifically engineered for hydraulic systems of excavators, delivering continuous and stable hydraulic power for heavy-duty operations such as digging, lifting, rotating, and leveling. As a core hydraulic component in Rexroth’s construction machinery product portfolio, this series integrates precision manufacturing technology and rugged structural design, making it highly adaptable to the harsh working conditions of excavators—including heavy loads, frequent pressure fluctuations, and dusty or humid environments—while maintaining exceptional durability and operational efficiency.
Core Features
- Low Noise & Stable Operation: Adopting precision-machined involute gears and an advanced axial gap compensation mechanism, the pump minimizes operating noise and pressure pulsation. This ensures smooth operation even during long-hour continuous work of excavators, reducing operator fatigue and mechanical vibration.
- High Efficiency & Load-Bearing Capacity: Equipped with optimized radial clearance compensation technology, the pump achieves a volumetric efficiency of over 90% under normal working conditions, effectively converting mechanical energy into hydraulic energy. Its pressure-balanced design enhances load resistance, enabling stable output even under sudden heavy-load impacts common in excavator operations.
- Robust & Contamination-Resistant Construction: The pump body is crafted from high-strength cast iron, offering superior impact resistance and rigidity compared to ordinary alloys. It is equipped with wear-resistant steel gears and heavy-duty composite bearings, paired with high-temperature resistant seals. This structure enhances resistance to hydraulic oil contamination—a key challenge in construction sites—and extends service life in harsh working environments.
- Flexible Configuration & System Compatibility: It supports modular combination into double or triple gear pumps, and can be seamlessly integrated with Rexroth’s hydraulic valves, motors, and other components. For excavators, it adapts to multi-circuit hydraulic systems, including boom, arm, bucket, and swing mechanisms, meeting complex operational requirements with precise flow control.
- Optimal Viscosity Adaptation: Designed to accommodate hydraulic oil with a viscosity range of 13~68 cSt (40ºC), and capable of withstanding cold-start viscosity up to 2,160 cSt. This ensures reliable startup and stable operation of excavators in both high-temperature and low-temperature working environments.
Technical Parameters
| Parameter Item | Specification Range |
| Displacement | 5.0 – 120 ml/rev (specific value varies by model) |
| Rated Pressure | Up to 35 MPa (350 bar) |
| Peak Pressure | Up to 40 MPa (400 bar) |
| Maximum Speed | Up to 3600 r/min (specific value varies by model) |
| Material | Pump body: High-strength cast iron; Gear: Wear-resistant steel; Bearing: Composite heavy-duty bearing |
| Connection Type | Flange connection (complying with ISO/SAE standards) for excavator power system |
Note: Specific parameters are subject to the actual model. For detailed technical data of a specific model, please refer to the official product manual.
Application in Excavators
The 0511 Series Gear Pump serves as the “power heart” of excavator hydraulic systems, supporting key operational mechanisms as follows:
- Boom & Arm Hydraulic System: Provides stable hydraulic power for the lifting and lowering of the boom and the telescoping of the arm. Its high-pressure resistance and precise flow control ensure smooth and efficient digging operations, even when handling heavy materials.
- Bucket Hydraulic System: Drives the bucket’s opening and closing actions, delivering sufficient force for grabbing, loading, and unloading materials. The pump’s rapid response capability enhances the bucket’s operational agility, improving overall work efficiency.
- Swing Hydraulic System: Supplies hydraulic oil to the swing motor, enabling the excavator upper structure to rotate smoothly and accurately. Low noise operation and stable pressure output ensure precise positioning during rotation, reducing operational errors.
- Auxiliary Hydraulic System: Supports optional hydraulic attachments such as hydraulic breakers, grapples, and augers. The pump’s flexible flow adjustment capability adapts to different attachment requirements, expanding the excavator’s application scope.
Typical Models
Common models of the 0511 Series Gear Pump applicable to excavators include:
- 0511725008 (PGH2-2X/016RR07VU2)
- 0511725010 (PGH2-2X/020RR07VU2)
- 0511735006 (PGH3-3X/040RR11VU2)
- 0511735008 (PGH3-3X/050RR11VU2)
- 0511745004 (PGH4-4X/080RR11VU2)
The Rexroth 0511 Series Gear Pump is dedicated to providing reliable hydraulic solutions for the construction machinery industry. With its robust performance, excellent adaptability, and compatibility with excavator working conditions, it has become a preferred component for major excavator manufacturers and after-sales maintenance markets worldwide.
