{"product_id":"h2136171-hydraulic-gear-pump-with-7-8-13-spline-shaft-and-1-3-4-inch-diameter-gear","title":"H2136171 - Hydraulic Gear Pump With 7\/8-13 Spline Shaft And 1-3\/4 Inch Diameter Gear","description":"\u003cp\u003eThe H21 Series Hydraulic Gear Pump with Spline Shaft from Buyers Products is a sturdy, durable bi-rotational pump that can be 2- or 4-bolt mounted in an SAE B mount.  The pump is built tough of cast iron with teflon-coated bronze thrust plates. Four internal dowels work to protect its structural integrity.   Choose from a range of models with flow rates from 6.8 to 15.3 at 1000 RPM. The pumps are capable of higher pressures, taking up to 2500 or 3000 PSI.     All of the models feature a 7\/8 in. by 13 spline shaft.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable style=\"border-collapse:collapse; width:100%; font-size:14px;\"\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eDirect Mount\/Remote Mount\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e2\/4 Bolt SAE B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eDirect or Remote Mount\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003eDirect Mount\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eDisplacement\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eFlow\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border=\" solid background:\u003eFlow at 1000 RPM\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eFlow at 1200 RPM\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e15.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eFlow at 1500 RPM\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e19.5\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eFlow at 1800 RPM\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e23.4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eFlow at 2100 RPM\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e27.3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eFlow at 600 RPM\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e7.8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eFlow at 900 RPM\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e11.7\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eGear Size\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e1.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eGear Width\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e1.750\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eInlet Port Size\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e1 1\/4 NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eInput Mount Type\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003eIntegral Bracket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eMaterial\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003eCast Iron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eMaximum Pressure\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e2500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eMaximum Rotations Per Minute (RPM)\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e2000\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eMount Type\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003eSAE B 2\/4 Bolt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eOutlet Port Size\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e1 1\/4 NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003ePilot Diameter\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e4.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003ePorts (rear\/side)\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003eRear\/Side\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eRear Port Size\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e1 NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eRotation\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003eBi-Directional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eShaft Size\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e7\/8-13\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eShaft Type\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003eSplined\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align:left; padding:6px 10px; border:1px solid #e5e7eb; background:#f9fafb;\"\u003eSuction Port Size\u003c\/th\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #e5e7eb;\"\u003e1 1\/4 NPT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eComprehensive Technical Overview: H21 Series Hydraulic Gear Pump with 7\/8-13 Spline Shaft and 1-3\/4 Inch Diameter Gear\u003c\/h3\u003e\u003cp\u003eThe H21 Series Hydraulic Gear Pump from Buyers Products represents a pinnacle of robust engineering designed for demanding hydraulic power applications. As a positive displacement pump, it plays a critical role in converting mechanical power into hydraulic energy, ensuring consistent and reliable fluid flow essential for a vast array of industrial and mobile machinery. Its bi-rotational capability, coupled with an exceptionally durable construction, positions it as a versatile and high-performance solution for systems requiring precise and powerful hydraulic actuation.\u003c\/p\u003e\u003cp\u003eAt its core, the H21 Series operates on the principle of external gear pump technology. Two intermeshing gears, one driven by the prime mover (engine or electric motor) via the input shaft, and the other an idler gear, create a pumping action. As the gears rotate, fluid from the inlet port is trapped in the spaces between the gear teeth and the pump housing. This trapped fluid is then carried around the periphery of the pump and discharged under pressure at the outlet port. The inherent positive displacement nature of this design ensures that a fixed volume of fluid is displaced with each revolution, resulting in a highly predictable and linear flow rate proportional to the pump's rotational speed, a critical characteristic for system control and efficiency.\u003c\/p\u003e\u003cp\u003eThe construction of the H21 Series is engineered for maximum durability and longevity, even in the most arduous operating environments. The pump housing is meticulously crafted from high-grade cast iron. Cast iron is chosen for its superior material properties, which include high tensile strength, excellent rigidity, and exceptional damping characteristics. These attributes are vital for withstanding the significant internal pressures generated during operation (up to 2500-3000 PSI) and for minimizing noise and vibration. The robust cast iron structure ensures dimensional stability, preventing housing deformation that could lead to internal leakage or component misalignment over time. This foundational strength contributes directly to the pump's extended service life and consistent performance under continuous duty cycles.\u003c\/p\u003e\u003cp\u003eFurther enhancing its structural integrity and operational efficiency are the Teflon-coated bronze thrust plates. These plates are strategically positioned at the sides of the gears, forming a crucial sealing surface to manage axial loads and minimize internal leakage paths between the high-pressure and low-pressure zones within the pump. The bronze material provides inherent lubricity and corrosion resistance, while the Teflon coating significantly reduces friction and wear between the rotating gears and stationary plates. This reduction in frictional losses translates directly to improved mechanical efficiency, lower operating temperatures, and prolonged component life, particularly beneficial under varying operating conditions and fluid temperatures. The precise fit and material selection for these thrust plates are instrumental in maintaining high volumetric efficiency throughout the pump's operational range.\u003c\/p\u003e\u003cp\u003eIntegral to the pump's design are four internal dowel pins. These dowels serve a critical function in maintaining the precise alignment of the internal components, particularly the gear set and the pump housing sections. In a high-pressure hydraulic system, maintaining exact clearances and alignment is paramount to prevent premature wear, reduce internal leakage, and ensure consistent performance. The dowels prevent relative movement between the assembled parts, thereby safeguarding the structural integrity against stress concentrations and maintaining the critical dimensional stability required for optimal gear meshing and sealing. This meticulous internal bracing underpins the pump's reliability and its ability to sustain high-pressure operations over extended periods.\u003c\/p\u003e\u003cp\u003eThe H21 Series features a robust 7\/8-inch by 13 spline shaft, a choice that underscores its design for high-power transmission and reliability. Spline shafts, characterized by multiple parallel keyways machined around the circumference, offer significant advantages over traditional keyway or plain shafts. The splines distribute the transmitted torque over a much larger surface area, drastically reducing stress concentrations and minimizing the risk of shaft failure or wear, particularly under heavy loads or shock conditions. This design also provides superior alignment capabilities, ensuring concentricity with the prime mover and reducing detrimental side loads on the pump's bearings and seals. The 7\/8-inch diameter and 13 splines conform to industry standards, typically SAE B, ensuring broad compatibility with a wide range of power take-offs (PTOs) and drive systems. This robust spline connection is crucial for facilitating reliable power input regardless of the desired rotation direction, a key enabler for the pump's bi-directional functionality.\u003c\/p\u003e\u003cp\u003eAt the very heart of the H21 Series pump's hydraulic performance are its 1-3\/4 inch diameter gears, specified with a corresponding 1.750-inch gear width. The dimensions of these gears are directly proportional to the pump's displacement per revolution, which in this model is 3 cubic inches. This specific gear size is a carefully engineered parameter, optimized to deliver the specified flow rates and pressure capabilities while maintaining a compact form factor. The precision machining of the gear tooth profiles is critical; accurately formed involute teeth ensure smooth, quiet operation and minimize pulsation, while maintaining tight tolerances essential for maximizing volumetric efficiency. Typically, gears in such high-performance pumps are made from high-strength alloy steels, case-hardened to resist abrasive wear and surface fatigue, thereby ensuring a long and reliable operational life even when pumping abrasive-containing fluids or under high-stress conditions. The interaction between these precision gears and the Teflon-coated bronze thrust plates is fundamental to the pump's overall efficiency and pressure containment.\u003c\/p\u003e\u003cp\u003eMounting versatility is a hallmark of the H21 Series, offering both 2-bolt and 4-bolt SAE B mounting options. The SAE B flange standard is an industry-recognized specification for hydraulic pump mounting, ensuring interchangeability and facilitating integration into a wide range of existing hydraulic systems. The option for both 2-bolt and 4-bolt configurations provides adaptability: the 2-bolt mount is suitable for applications where space is at a premium or for lighter duty cycles, while the 4-bolt mount offers enhanced rigidity, superior load distribution, and increased resistance to vibration, making it ideal for high-vibration environments or heavy-duty applications. Designed for direct mounting, the pump features an integral bracket and a 4.00-inch pilot diameter, which ensures precise concentric alignment with the power source. Direct mounting simplifies installation, minimizes alignment challenges often associated with remote mounting, and creates a more compact, efficient drive train by eliminating intermediate coupling elements.\u003c\/p\u003e\u003cp\u003eThe performance metrics of the H21 Series demonstrate its capacity for flexible and powerful hydraulic fluid delivery. With a nominal displacement of 3 cubic inches per revolution, the pump delivers a predictable flow rate directly proportional to its input RPM. This is evident across the specified operational spectrum: from 7.8 GPM at 600 RPM, it scales linearly to 11.7 GPM at 900 RPM, 13.0 GPM at 1000 RPM, 15.6 GPM at 1200 RPM, 19.5 GPM at 1500 RPM, 23.4 GPM at 1800 RPM, and an impressive 27.3 GPM at 2100 RPM. This linearity of flow is a key advantage of positive displacement pumps, providing predictable system response and control. The precise internal clearances, combined with the effective sealing provided by the Teflon-coated bronze thrust plates and the accurate alignment secured by the internal dowels, contribute to consistently high volumetric efficiency across this entire operational range, ensuring that a minimal amount of fluid bypasses internally, maximizing the effective fluid output.\u003c\/p\u003e\u003cp\u003eEqually critical to its functionality is the pump's exceptional pressure capability, rated up to 2500 PSI, with certain models capable of reaching 3000 PSI. This high-pressure rating signifies the pump's suitability for the most demanding applications where substantial force generation is required. The robust cast iron housing, meticulously designed internal components, and the strength of the spline shaft are all engineered to safely contain and manage these significant internal pressures without compromise to structural integrity or operational reliability. The ability to generate high pressures allows system designers to utilize smaller hydraulic cylinders and motors, potentially leading to more compact and weight-efficient overall system designs. This capacity for high pressure under continuous operation is a testament to the meticulous material selection and advanced engineering principles applied in the H21 Series design.\u003c\/p\u003e\u003cp\u003eFluid dynamics and system integration are further optimized through versatile porting options. The H21 Series features generous 1 1\/4 NPT (National Pipe Taper) main inlet and outlet port sizes, ensuring efficient fluid transfer and minimizing pressure drops. Additionally, a 1 NPT rear port option provides design flexibility, allowing for optimized hose routing and installation in confined spaces. The NPT thread standard ensures secure, leak-free connections, vital for maintaining system integrity and preventing environmental contamination. Careful consideration of inlet port size is crucial to prevent cavitation, a phenomenon where insufficient fluid supply leads to vapor bubble formation, causing noise, vibration, and damage to pump components. The ample port sizing on the H21 Series helps mitigate this risk, ensuring a smooth and consistent flow of hydraulic fluid into the pump's pumping chambers.\u003c\/p\u003e\u003cp\u003eA standout feature of the H21 Series is its bi-directional rotation capability. This means the pump can operate effectively regardless of whether the input shaft rotates clockwise or counter-clockwise. This versatility is achieved through a carefully engineered symmetrical internal design, including specific gear tooth profiles and sealing arrangements that accommodate fluid flow in either direction. The primary advantage of bi-directional pumps is their adaptability to diverse applications and power take-off configurations. For systems requiring reversible motion, such as winch systems, certain fan drives, or reversible conveyors, a bi-directional pump simplifies system design and reduces the need for additional directional control valves or complex prime mover arrangements. Furthermore, it offers significant inventory advantages, as a single pump model can serve multiple applications with different rotation requirements.\u003c\/p\u003e\u003cp\u003eWhile not explicitly detailed in the specifications, the robust design inherently lends itself to efficient thermal management and broad fluid compatibility. The substantial cast iron housing contributes to heat dissipation, helping to maintain optimal operating temperatures within the hydraulic system. The pump is compatible with standard petroleum-based hydraulic oils, and judicious fluid selection—including proper viscosity grades and additives—is crucial for maximizing performance and longevity. Equally important is stringent fluid filtration. Maintaining clean hydraulic fluid prevents abrasive wear on the precision-machined gears, bearings, and thrust plates, which are susceptible to damage from particulate contamination. Proper fluid management and temperature control are foundational to the sustained health and efficiency of the H21 Series pump and the broader hydraulic system it powers.\u003c\/p\u003e\u003cp\u003eThe H21 Series Hydraulic Gear Pump finds its ideal application across a broad spectrum of industries, owing to its rugged construction, high-pressure capability, flexible flow rates, and bi-directional operation. In mobile hydraulics, it is extensively used in dump trucks, refuse compactors, snow plows, salt spreaders, and various utility vehicles for powering lift mechanisms, auxiliary equipment, and material handling functions. Within the agricultural sector, it provides reliable hydraulic power for tractors, harvesters, and a multitude of implements requiring hydraulic lifts, steering, or other auxiliary functions. For construction equipment, from mini excavators and skid steers to cranes, the H21 Series can drive critical hydraulic circuits. Furthermore, its reliability and robust performance make it suitable for industrial power units, factory automation, presses, machine tools, lubrication systems, and test stands. The combination of its core features makes it exceptionally well-suited for the demanding and varied conditions encountered in these sectors, where reliability and consistent power delivery are non-negotiable.\u003c\/p\u003e\u003cp\u003eTo maximize the service life and ensure optimal performance of the H21 Series pump, careful attention to installation and maintenance protocols is essential. Proper installation requires precise shaft alignment to prevent undue stress on the input shaft and bearings, secure mounting using the SAE B 2- or 4-bolt pattern, and correct, leak-free port connections. Regular preventive maintenance, including routine checks of hydraulic fluid levels and condition, and timely replacement of filters, is paramount to prevent premature wear from contamination. The inherent robustness of the design – featuring cast iron construction, Teflon-coated bronze thrust plates, internal dowels, and a heavy-duty spline shaft – significantly contributes to an extended expected service life, translating into reduced downtime and a lower total cost of ownership over the pump’s operational lifespan. Adherence to these practices will ensure that the H21 Series delivers its full potential in terms of efficiency, power, and durability.\u003c\/p\u003e\u003cp\u003eIn conclusion, the H21 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 sturdy cast iron construction, combined with precision-machined gears, Teflon-coated bronze thrust plates, and internal dowel reinforcement, ensures unparalleled durability and performance under high pressure and continuous duty. The bi-rotational capability and flexible mounting options offer significant versatility, making it an adaptable solution for a vast array of demanding mobile and industrial hydraulic applications. Delivering consistent flow rates ranging from 7.8 GPM to 27.3 GPM and capable of pressures up to 3000 PSI, this pump is an exceptional choice for engineers and operators seeking a reliable, efficient, and robust hydraulic power source that contributes significantly to operational efficiency and system integrity.\u003c\/p\u003e","brand":"buyersproductscompany","offers":[{"title":"Default Title","offer_id":62449269309811,"sku":"H2136171","price":415.4,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/9513\/9187\/files\/H2136101_45_e6a44b2e-72b6-48db-bb00-79d3a86be1f1.jpg?v=1768594323","url":"https:\/\/titustrucksaccessories.com\/products\/h2136171-hydraulic-gear-pump-with-7-8-13-spline-shaft-and-1-3-4-inch-diameter-gear","provider":"Titus Trucks Accessories ","version":"1.0","type":"link"}