Ensure peak performance with the Graco 122787 Hub Cap, an OEM replacement designed for seamless integration into Graco spray systems. Precision-machined to tight tolerances, this robust, lightweight cap secures critical connections and helps maintain consistent spray patterns across a wide range of professional coatings. Its durable polymer construction resists solvent attack and wear, while its compact profile minimizes obstruction and downtime during maintenance. Compatible with over 87 Graco models, this cap enhances overall pump efficiency and safeguards against premature component failure. Ensuring reliable spray operation even under demanding conditions.
By pairing the Graco 122787 Hub Cap with regular system checks, you can prolong pump life, reduce clogging risks, and ensure optimal function under high-pressure filtration conditions. Ideal for contractors and industrial users, this cap integrates effortlessly into your prep routine, keeping your airless sprayer system running smoothly. Harness the benefits of consistent atomization and minimize contamination when applying professional coatings with confidence.
$6.3The Graco 122787 Hub Cap is a critical interface in high-performance fluid handling systems, designed for seamless integration into Graco’s pump assemblies. Weighing just 0.005 lbs with compact dimensions of 0.55 × 1.75 × 1.75 inches, this cap hub maintains precise alignment between the pump housing and rotating manifold subcomponents. Its geometry ensures optimal retention of internal O‐rings and dynamic seals, while resisting deformation under cyclic pressure loads. As part of a modular assembly on an airless sprayer, it safeguards against leakage at pressures exceeding 3,000 psi and contributes to consistent output in demanding industrial and commercial finishing applications.
Constructed from specialized, glass-reinforced polypropylene resin, the hub cap offers superior chemical resistance against solvents and coatings used in professional environments. Tight injection‐molding tolerances limit part-to-part variability, adhering to ASTM D638 and ISO 2768 standards. The thermoplastic matrix provides high wear resistance and low creep under sustained torque, even when paired with abrasive particulates in heavy-duty coatings. Such material selection supports consistent transfer of professional coatings without compromising interface geometry or seal face integrity over extended service intervals.
Key design attributes include a precision-molded lip that captures backup rings and seals in the housing groove, ensuring concentric seating under radial load. The hub cap’s flange profile distributes compressive forces evenly around the O‐ring perimeter, mitigating stress concentrations that lead to premature seal failure. Finite element analysis (FEA) guided rib placement and wall thickness to resist flexural bending moments during pump priming and reversal. Internal surface finishes maintain a micro‐roughness below Ra 0.8 µm, facilitating reliable sealing engagement and promoting long-term seal longevity in high-cycle operations.
Operating within graco pump modules, the hub cap supports high-pressure filtration regimes by directing flow through internal channels that isolate particulate contaminants ahead of strainers and filters. This pre-filter control enhances overall system durability and extends service life of downstream components. Thermal management through polymer choice ensures dimensional stability from –20°C to 80°C, a critical factor for spray-on polymers and solvent blends requiring precise temperature control. The cap’s stiffness-to-weight ratio reduces fluctuation in rotational balance, preventing vibration-induced wear.
Routine maintenance procedures call for a calibrated torque wrench set to the manufacturer’s specification, securing the cap hub without overstressing the thermoplastic threads. Removal and reinstallation cycles benefit from anti-galling compounds applied on the engineered thread profile, simplifying disassembly in field service. Proper alignment diminishes pump cavitation and supports optimum pump efficiency by ensuring the rotating manifold remains centered within tolerances, thereby preserving the fluid path integrity across hundreds of operating hours.
By leveraging advanced polymer science and exacting manufacturing controls, the Graco 122787 Hub Cap stands as an indispensable component in high-pressure spray systems. Its role in safeguarding internal seals, managing flow trajectories, and sustaining pressure continuity makes it a preferred choice for industrial finishers and equipment engineers seeking reliability, longevity, and maintenance simplicity in demanding production environments.
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