Parker P31 series gear pumps for combine harvesters
Parker Combine Harvester P31 Series Gear Pump
The Parker P31 Series Gear Pump is a high-reliability external gear pump specifically developed for the hydraulic systems of combine harvesters. It delivers continuous and precise hydraulic power for key operations such as header lifting, conveyor chain driving, grain unloading, and steering control. As a core component in Parker’s agricultural hydraulic product line, this series integrates rugged construction and optimized performance design, perfectly adapting to the harsh working conditions of combine harvesters—including long-hour continuous operation, dust, vibration, and temperature fluctuations—while maintaining excellent efficiency and service life.
Core Features
- Robust & Wear-Resistant Construction: Adopting high-strength cast iron pump body, the pump boasts superior rigidity and impact resistance to withstand the vibration and load shocks during harvester operation. Precision-machined, hardened alloy steel gears and shafts, paired with pressure-balanced wear plates, effectively reduce wear and maintain high volumetric efficiency throughout the entire operating range.
- Heavy-Duty Bearing & Sealing System: Equipped with heavy-duty needle roller bearings, it provides strong load-bearing capacity and durability even in rough working environments. The dual-seal structure and high-performance oil seals prevent hydraulic oil leakage and resist contamination from field dust, ensuring stable operation in harsh agricultural settings.
- Low Noise & Stable Operation: The optimized gear tooth profile and precise assembly reduce operating noise and pressure pulsation, creating a quieter working environment for operators. At low speeds (down to 1000 RPM), it still maintains stable flow output, avoiding power waste during harvester idling and improving energy utilization.
- Flexible Configuration & Standard Compatibility: Supporting modular combination into single, double, or multiple pumps, it can be seamlessly integrated with the multi-circuit hydraulic systems of combine harvesters. The mounting flanges and connection dimensions comply with SAE standards, enabling easy installation, replacement, and compatibility with most mainstream combine harvester models.
- Built-In Protection & Easy Maintenance: Each pump is equipped with a factory-set adjustable relief valve to prevent system overpressure and protect hydraulic components. The standardized design and accessible components simplify maintenance and repair work in the field, reducing downtime.
Technical Parameters
| Parameter Item | Specification Range |
|---|---|
| Displacement | 1.0 – 4.0 cu.in (corresponding to 16.4 – 65.5 ml/rev); Flow rate up to 38 GPM @ 1800 RPM |
| Rated Pressure | Up to 248 bar (3600 psi) |
| Maximum Speed | Up to 2400 RPM |
| Material | Pump body: High-strength cast iron; Gears/Shafts: Hardened alloy steel; Bearings: Heavy-duty needle roller bearings |
| Connection Type | SAE B 2/4-bolt mounting flange; SAE B spline shaft; Side/rear ports available |
| Rotation Direction | Dual rotation (compatible with pump/motor dual-purpose applications) |
Note: Specific parameters vary by model. For detailed technical data of a specific model, please refer to the official Parker product manual.
Application in Combine Harvesters
The P31 Series Gear Pump serves as the core power source for combine harvester hydraulic systems, supporting key operational mechanisms as follows:
- Header Hydraulic System: Provides stable hydraulic power for header lifting and height adjustment. Its precise flow control ensures smooth and rapid header movement, adapting to different crop heights and field terrains, and improving harvesting efficiency.
- Conveyor & Threshing System: Drives the conveyor chain and threshing drum auxiliary mechanisms. The high load-bearing capacity and stable pressure output ensure continuous operation of these core components, even when handling high-yield crops.
- Grain Unloading System: Powers the grain auger and unloading mechanism. The pump’s rapid response capability shortens grain unloading time, reduces waiting periods, and enhances the overall working efficiency of the harvester.
- Steering & Auxiliary System: Supplies hydraulic oil to the steering system, making the harvester’s steering lighter and more flexible during field operation. It also supports auxiliary hydraulic components, expanding the harvester’s functional versatility.
Typical Models & Compatibility
The P31 Series Gear Pump features a high degree of interchangeability, with common models and compatible specifications including:
- P3100 Series: Basic model with standard displacement, suitable for small to medium-sized combine harvesters.
- P31 Dual Pump Assemblies: Customizable double pump combinations for multi-circuit hydraulic systems of large combine harvesters.
- Interchangeability: 100% interchangeable with Parker Commercial Intertech, Permco, and Metaris MH31 series gear pumps, facilitating maintenance and replacement.
With its rugged performance, excellent compatibility, and tailored design for agricultural operations, the Parker P31 Series Gear Pump has become a trusted choice for global combine harvester manufacturers and after-sales maintenance markets, delivering reliable hydraulic solutions for efficient harvesting.
