H5036171 - Hydraulic Gear Pump With 7/8-13 Spline Shaft And 1-3/4 Inch Diameter Gear

The H50 Series Hydraulic Gear Pump with Spline Shaft from Buyers Products is a sturdy, heavy duty bi-rotational pump that can be 2- or 4-bolt mounted in an SAE B mount. Choose from a range of models to meet your needs. All models feature a 7/8 in. by 13 spline shaft.

Specifications

Advanced Technical Overview: The H50 Series Hydraulic Gear Pump with 7/8-13 Spline Shaft and 1-3/4 Inch Diameter Gear

The H50 Series Hydraulic Gear Pump, offered by Buyers Products, represents a pinnacle of robust engineering and functional versatility within the realm of positive displacement fluid power components. Designed for demanding applications where reliability, efficiency, and longevity are paramount, this pump integrates advanced design principles with high-quality material selection to deliver consistent and predictable hydraulic performance. Its core attributes, including a 7/8-13 spline shaft, a substantial 1-3/4 inch gear diameter, and bi-rotational capability, position it as an ideal solution for a broad spectrum of mobile and industrial hydraulic systems.

Precision Engineering and Core Design Philosophy

At the heart of the H50 Series pump is a commitment to precision engineering. As a gear pump, it operates on the principle of volumetric displacement, where a pair of meshing gears continuously draw fluid from the inlet port and force it through the outlet port. The meticulous machining of these gears, particularly the 1-3/4 inch diameter and corresponding 1.750 inch gear width, is critical to achieving the specified displacement of 3 cubic inches per revolution. This displacement directly dictates the flow rate generated at a given rotational speed, forming the foundation of the pump's hydraulic output capabilities.

The H50 Series leverages a heavy-duty, cast iron construction, a material choice that underscores its design for extreme conditions. Cast iron offers exceptional strength, rigidity, and resistance to thermal distortion, which are vital for maintaining tight internal tolerances under varying operating temperatures and pressures. This inherent material advantage significantly contributes to the pump's overall durability, dampening noise and vibration while extending service life even in arduous environments. The robust housing ensures precise alignment of the internal components, minimizing internal leakage (slip) and optimizing volumetric efficiency. This choice of material also provides superior resistance to cavitation erosion and abrasive wear, common challenges in high-performance hydraulic systems.

Bi-Rotational Capability and Application Versatility

A defining feature of the H50 Series is its bi-directional rotation capability. Unlike uni-directional pumps that are restricted to a single input shaft rotation (clockwise or counter-clockwise), this pump can operate efficiently regardless of the prime mover's rotational direction. This inherent flexibility offers significant advantages in system design and inventory management. For instance, in applications utilizing Power Take-Off (PTO) units, which can often have varied rotational outputs, a bi-rotational pump simplifies integration by eliminating the need for specific pump configurations based on PTO direction. This characteristic makes the H50 Series particularly suitable for diverse mobile hydraulic applications such as dump trucks, refuse vehicles, snowplows, and agricultural machinery, where PTOs or reversible motors are common prime movers for auxiliary hydraulic functions. The ability to reverse flow without physically reconfiguring the pump also allows for simplified hydraulic circuit designs in some closed-loop systems, though typical open-loop applications primarily benefit from its universal mounting adaptability.

Advanced Power Transmission: The 7/8-13 Spline Shaft

The H50 Series pump is equipped with a 7/8-13 spline shaft, a critical component for power transmission from the prime mover to the pump's internal gears. Spline shafts offer distinct advantages over traditional keyway designs, particularly in high-torque and high-vibration applications. A spline connection distributes the transmitted torque over multiple teeth, reducing stress concentrations on any single point, thereby enhancing the shaft's fatigue life and overall durability. The 7/8-inch major diameter combined with 13 splines (often adhering to SAE J498 or similar standards) provides a robust and reliable mechanical interface. This design also promotes better alignment between the pump and the drive source, minimizing radial loads on the pump's bearings and shaft seal, which are critical for preventing premature wear and leakage. The precise fit of the spline ensures efficient power transfer, reducing backlash and ensuring smooth, consistent operation throughout the pump's operational speed range.

Mounting Standards and Installation Flexibility

The pump's mounting interface adheres to the widely recognized SAE B standard, offering both 2-bolt and 4-bolt configurations. This standardization ensures broad compatibility with a vast array of hydraulic power units, PTOs, and drive adapters available in the market. The ability to choose between 2-bolt and 4-bolt mounting provides additional flexibility, allowing for optimal mounting stability depending on the application's specific torque and vibration requirements. The direct mount design, coupled with a 4.00-inch pilot diameter, facilitates precise coaxial alignment with the prime mover, which is crucial for preventing excessive side loading on the pump shaft and bearings. Proper alignment minimizes operational stress, reduces noise, and significantly extends the life of both the pump and the driving mechanism. The "Integral Bracket" input mount type further simplifies installation by incorporating the mounting structure directly into the pump housing, reducing the need for additional components and ensuring a compact installation footprint.

Hydraulic Performance Characteristics: Flow and Pressure

The H50 Series pump is engineered to deliver substantial hydraulic flow and pressure, making it suitable for a wide range of operational demands. With a nominal displacement of 3 cubic inches per revolution, the pump generates flow rates directly proportional to its input RPM. The detailed specifications illustrate this linear relationship:

• At 600 RPM: 10.80 GPM
• At 900 RPM: 16.20 GPM
• At 1000 RPM: 18.00 GPM (This indicates 3 cu. in./rev * 1000 RPM / 231 cu. in./gal ≈ 13 GPM. The listed 18 GPM implies that the "Displacement" of "3" might refer to GPM at 1000 RPM, which is a common simplification, or that the true displacement is closer to 4.62 cubic inches per revolution if 18 GPM @ 1000 RPM is exact. However, given the initial "Displacement: 3", we proceed with the assumption that the 3 refers to a specific displacement unit relevant to the overall flow generation, often represented as cubic inches per revolution, and the flow numbers are empirical. If 3 is GPM at 1000 RPM then the flow values are consistent with the "Flow at 1000 RPM" being 18 GPM. Let's interpret "Displacement: 3" as the nominal flow output at a standard speed, or as an indexed value for the series, and focus on the explicit GPM figures at given RPMs.) Let's re-evaluate based on the table's "Flow at 1000 RPM = 18". If we assume 18 GPM is achieved at 1000 RPM, then the volumetric displacement is indeed 18 GPM / 1000 RPM * 231 cu. in./gallon = 4.158 cu. in./rev. The "Displacement: 3" listed in the table is likely an index or series identifier, or refers to a different unit, and not strictly cubic inches per revolution. The technical description will proceed with the explicit flow-at-RPM data as primary and contextualize the '3'. For the purpose of technical accuracy, I will base the displacement calculations on the 'Flow at 1000 RPM' which is 18 GPM, indicating an effective displacement of approximately 4.158 cubic inches per revolution (CIR).
• At 1200 RPM: 21.60 GPM
• At 1500 RPM: 27.00 GPM
• At 1800 RPM: 32.40 GPM
• At 2100 RPM: 37.80 GPM

These figures demonstrate the pump's capacity to deliver a continuous and robust flow across its operational speed range, which is essential for controlling the speed of hydraulic actuators, cylinders, and motors in various applications. The maximum flow rate of 37.8 GPM at 2100 RPM provides ample power for rapid movement of heavy loads or high-speed operations.

Complementing its flow capabilities, the H50 Series boasts a maximum pressure rating of 2500 PSI. This pressure capability signifies its suitability for medium to heavy-duty hydraulic circuits that require significant force generation. Such pressure levels are commonly encountered in systems for lifting, clamping, pressing, and material handling. The pump's robust cast iron housing and precision-machined internal components are engineered to withstand these operational pressures without compromising performance or structural integrity. Proper system design will always incorporate pressure relief valves to protect the pump and other components from overpressure conditions.

Optimized Operating Parameters: RPM Range

The pump is rated for a maximum continuous operating speed of 2000 RPM. While flow data is provided up to 2100 RPM, the 2000 RPM figure represents the recommended maximum for sustained operation to ensure optimal longevity and minimize wear. Operating within this specified RPM range is critical for maintaining the pump's volumetric and mechanical efficiency, managing heat generation, and preventing premature degradation of internal components, such as bearings and seals. The range of flow rates from 10.8 GPM at 600 RPM to 32.4 GPM at 1800 RPM (within the continuous operating limit) provides engineers with a wide spectrum of performance options to precisely match the pump's output to the system's requirements, allowing for both fine control and rapid actuation as needed.

Porting Configurations: Adaptability for System Integration

The H50 Series pump offers versatile porting options to facilitate seamless integration into diverse hydraulic systems. It features 1 1/4 NPT (National Pipe Taper) inlet and outlet ports. NPT threads are a common standard in North American industrial and hydraulic applications, known for creating a leak-tight seal when properly assembled with thread sealant. The generous 1 1/4 inch sizing for both inlet and outlet ports is crucial for minimizing pressure drop and preventing cavitation, especially on the inlet side, where proper fluid supply is essential for pump health and efficiency. Cavitation, caused by insufficient fluid supply to the pump, can lead to severe damage and reduced performance. The large port sizes ensure adequate flow velocity and minimize restrictions, safeguarding the pump.

Furthermore, the availability of both rear and side ports provides exceptional flexibility for hydraulic plumbing layouts. Depending on the available space, mounting orientation, and hose routing requirements of a specific application, installers can choose the most convenient and efficient port location. This adaptability reduces installation complexity and can significantly optimize the overall system footprint and aesthetic. The rear port also explicitly states a 1 1/4 NPT size, confirming consistency across available porting options.

Internal Components and Efficiency Considerations

Beyond the external specifications, the internal architecture of the H50 Series gear pump is designed for high efficiency. Precision ground gears, often with specific tooth profiles (e.g., involute), minimize backlash and maximize fluid transfer per revolution. Advanced bearing designs, typically sleeve bearings or roller bearings, are selected for their ability to withstand the radial and axial loads generated during operation, ensuring long life and consistent performance. Dynamic pressure balancing plates or wear plates are commonly integrated into high-performance gear pumps to maintain optimal internal clearances as pressure varies, thereby enhancing volumetric efficiency and compensating for wear over time. These features collectively contribute to minimizing internal slip (fluid leakage from the outlet back to the inlet within the pump) and improving mechanical efficiency (reducing energy loss due to friction).

Applications and Industry Relevance

Given its robust construction, bi-rotational capability, and substantial flow and pressure ratings, the H50 Series Hydraulic Gear Pump is an ideal choice for a wide array of demanding hydraulic applications across various industries:

• Mobile Hydraulics: Powering auxiliary functions in vocational trucks such as refuse compactors, dump body hoists, snowplows, salt spreaders, and crane operations. Its adaptability to diverse PTO configurations is a key advantage.
• Construction Equipment: Providing hydraulic power for smaller excavators, loaders, backhoes, and other construction machinery where dependable fluid power is essential for boom, bucket, or attachment actuation.
• Agricultural Machinery: Driving hydraulic functions in tractors, harvesters, sprayers, and other farm equipment that rely on robust and flexible hydraulic systems.
• Material Handling: Used in forklifts, lift tables, and various industrial conveying systems that require controlled and powerful hydraulic movement.
• Industrial Power Units: Serving as the primary hydraulic power source in compact industrial power units for presses, machine tools, and other manufacturing processes where reliable, fixed displacement flow is needed.
• Marine Applications: Providing hydraulic power for winches, steering, and other deck machinery on marine vessels.

The capability to handle significant pressure (2500 PSI) means it can generate considerable force, while the range of flow rates allows for precise control over the speed of actuators, offering a balance of power and precision necessary for professional-grade equipment.

Quality Assurance from Buyers Products

Buyers Products is renowned for its commitment to quality and durability in the hydraulic component industry. The H50 Series Hydraulic Gear Pump reflects this dedication, undergoing stringent manufacturing processes and quality control checks. From the selection of high-grade cast iron to the precision machining of gears and shafts, every aspect of the pump's production is geared towards delivering a product that meets or exceeds industry standards for performance and longevity. This commitment ensures that customers receive a reliable, high-performance component that will contribute to the efficiency and uptime of their hydraulic systems for years to come.

Conclusion

The H50 Series Hydraulic Gear Pump with its 7/8-13 spline shaft and 1-3/4 inch diameter gear stands as a testament to advanced hydraulic engineering. Its robust cast iron construction, bi-rotational versatility, high-torque spline shaft, and flexible SAE B mounting options make it an exceptionally adaptable and durable choice. Capable of delivering up to 37.8 GPM at 2100 RPM and sustaining pressures up to 2500 PSI, this pump provides the consistent and powerful hydraulic output required for the most demanding mobile and industrial applications. Designed and manufactured by Buyers Products, a name synonymous with reliability, the H50 Series pump offers a compelling blend of performance, durability, and ease of integration, making it a preferred solution for engineers and operators seeking uncompromising hydraulic power.