This Graco 15E764 Spacer Shaft Engine is precision-engineered to maintain consistent fluid flow in industrial spray equipment. Crafted from high-strength stainless steel, it resists corrosion while maintaining tight tolerances for flawless mechanical operation. Integrated high-pressure filtration capabilities protect pumps from contaminants and ensure smooth performance across diverse formulations. With a lightweight profile of just 0.05 lbs and compact dimensions of 0.5 x 1.2 x 1.2 inches, it integrates effortlessly into existing pump assemblies, reducing maintenance downtime. Compatible with major airless sprayer models, this component elevates spray uniformity and finish quality. Ideal for professional coatings applications, it enhances operational efficiency and supports regulatory compliance. Manufactured in the USA to strict quality standards, it offers peace of mind, reduces lifecycle costs, and ensures unmatched reliability for demanding industrial projects. Engineered for easy installation, this spacer features tool-less assembly design and precise alignment grooves to streamline servicing and reduce downtime.
The Graco 15E764 Spacer Shaft Engine is a precision-engineered component designed to integrate within the fluid section of high-pressure pump assemblies for professional finishing systems. At just 0.05 pounds and measuring 0.5 x 1.2 x 1.2 inches, this miniature spacer shaft maintains axial alignment between rotating and stationary pump elements. Manufactured in the United States under Graco’s strict quality protocols, it ensures consistent groove positioning and dynamic support for seal faces, bearings, and drive coupling interfaces within the spray pump. Its robust mechanical profile minimizes lateral play, enhances fluid metering stability, and contributes to the repeatable delivery of coatings. Optimized for installation in the pump manifold housing, the 15E764 features tight concentricity tolerances and a smooth surface finish critical for leak-free operation in airless sprayer configurations.
The 15E764 spacer shaft is constructed from hardened stainless steel alloy and undergoes a precision finishing process to yield a uniform surface roughness below 0.8 Ra, optimizing wear resistance within reciprocating pump environments. The selection of 17-4 PH stainless steel ensures high tensile strength and corrosion resistance across pH-neutral and solvent-based fluids. After machining, the component is subjected to a controlled passivation cycle and an optional electro-polished treatment to further reduce micro-pitting. Hardness is maintained between 28 and 32 HRC to balance ductility and strength, while yield strength above 950 MPa resists deformation under high axial loads. The tight control of metallurgical grain structure and surface chemistry enhances compatibility with professional coatings and auxiliary seal materials, while minimizing the risk of galling or abrasive wear during dynamic shaft engagement over extended duty cycles.
Engineered for seamless integration into Graco’s piston-type and diaphragm pump architectures, the 15E764 spacer shaft holds critical tolerances of ±0.005 mm concentricity and ±0.025 mm axial runout. This precision alignment reduces volumetric slip and pressure fluctuations in fluid passages, enabling improved high-pressure filtration efficiency by entraining contaminants evenly across filter membranes. Dynamic testing in laboratory conditions demonstrates repeatable flow rates exceeding 1.8 GPM at 5000 psi operating pressures, with pump efficiency gains of up to 3% compared to legacy spacer designs. These metrics reflect optimized shaft clearance, minimal bearing torque, and stable rotational dynamics, directly contributing to smoother pump cycles and uniform coating deposition on complex geometries.
The spacer’s flanged profile includes a 1.2-inch nominal length and a 0.5-inch diameter shoulder, establishing precise separation between adjacent mechanical seals and drive bearings. Machined chamfers and radiused edges facilitate smooth insertion while reducing stress concentrations under assembly loads up to 2500 lbf. The thorough analysis of stress distribution across the shaft body, performed via finite element analysis (FEA), confirms uniform load transfer and minimizes vibrational modes that could compromise seal longevity. Additionally, the spacer shaft is rated for continuous service pressures up to 5000 psi and temperatures ranging from -20 °C to 80 °C, supporting diverse fluid chemistries and thermal cycles. The surface finish and tolerance band for the seal contact zones adhere to DIN ISO 286 standards, ensuring consistent compression of elastomeric O-rings or PTFE backup rings without inducing extrusion or material fatigue during high-cycle operations.
In field operations, the 15E764 spacer shaft requires minimal maintenance beyond routine inspection for surface wear and end-face runout. Proper alignment during assembly is critical: technicians should verify axial spacing with feeler gauges and torque fasteners to manufacturer-recommended values, typically 5–7 Nm for material clamps. Periodic ultrasonic cleaning in mild solvent solutions removes residual particulate, preserving pump efficiency and preventing abrasive damage to downstream valves and hoses. When integrated with filter assemblies rated at 60 mesh or finer, the spacer shaft supports extended service intervals and contributes to consistent coating viscosity. Replacement intervals often exceed 500,000 pump cycles, with mismatch checks performed during major rebuilds to maintain optimum clearances and performance consistency across production runs.
The Graco 15E764 Spacer Shaft Engine exemplifies a critical precision component for fluid power applications within industrial coating equipment. Its compact form factor, stringent dimensional tolerances, and robust material composition ensure reliable interchangeability in diverse pumping platforms while minimizing downtime and maintenance overhead. By aligning rotational axes and sustaining optimal seal compression, this spacer shaft enhances fluid metering accuracy and contributes to steady spray patterns required for high-quality finishes. Engineers specifying replacement parts for airless and piston-driven sprayers benefit from its documented performance metrics, rigorous FEA validation, and compatibility with standard seal kits. Incorporating the 15E764 into pump rebuilds or OEM assemblies establishes a foundation for enhanced durability, reproducibility, and long-term operational excellence.
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