{"product_id":"century-hsq165-1-65-hp-square-flange-pool-pump-motor","title":"Century HSQ165 1.65 HP Square Flange Pool Pump Motor","description":"\u003ch2\u003eCentury HSQ165 1.65 HP Square Flange Pool Pump Motor\u003c\/h2\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eCentury HSQ165 Pool Pump Motor\u003c\/strong\u003e is a 1.65 HP single-speed replacement motor built for compatible pool and spa pumps that use a \u003cstrong\u003e48Y square flange, threaded shaft motor\u003c\/strong\u003e. Designed for residential pool pump applications, the HSQ165 is a popular replacement choice when the existing motor is noisy, seized, overheating, tripping the breaker, or no longer starting reliably.\u003c\/p\u003e\n\n\u003cp\u003eThis motor is commonly used on pump setups that require a \u003cstrong\u003e1.65 total horsepower, 3450 RPM, 115\/230V, square flange motor\u003c\/strong\u003e. Before ordering, always match the motor frame, flange style, voltage, horsepower, and shaft type to your existing motor and pump wet end.\u003c\/p\u003e\n\n\u003cdiv style=\"border: 1px solid #d9e6ee; background: #f7fbfd; padding: 18px; border-radius: 10px; margin: 22px 0;\"\u003e\n  \u003ch3 style=\"margin-top: 0;\"\u003eWhy Buy the Century HSQ165 Motor?\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003e1.65 HP pool pump motor\u003c\/strong\u003e for compatible pool and spa pump applications\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003e48Y square flange design\u003c\/strong\u003e for pumps that use a square-flange motor mount\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eThreaded shaft motor\u003c\/strong\u003e for compatible impeller-style pool pump assemblies\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDual voltage 115\/230V operation\u003c\/strong\u003e for flexible replacement wiring options\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSingle-speed 3450 RPM performance\u003c\/strong\u003e for standard residential pump applications\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eCenturion Pro \/ Century replacement motor family\u003c\/strong\u003e trusted throughout the pool industry\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eProduct Details\u003c\/h3\u003e\n\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin: 18px 0;\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003eCentury \/ A.O. Smith \/ Regal Rexnord\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003eHSQ165\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e\u003cstrong\u003eMotor Type\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003ePool and Spa Pump Motor\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e\u003cstrong\u003eHorsepower\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e1.65 HP \/ 1.65 THP\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e115\/230V\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e\u003cstrong\u003eSpeed\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e3450 RPM\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e\u003cstrong\u003ePhase\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003eSingle Phase\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e\u003cstrong\u003eFrame\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e48Y\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e\u003cstrong\u003eFlange Type\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003eSquare Flange\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003e\u003cstrong\u003eShaft Type\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"border: 1px solid #d9e6ee; padding: 10px;\"\u003eThreaded Shaft\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat Pump Does the Century HSQ165 Fit?\u003c\/h3\u003e\n\n\u003cp\u003eThe Century HSQ165 is a replacement motor, not a complete pump. Fitment is determined by the \u003cstrong\u003epump wet end\u003c\/strong\u003e and the original motor specifications. This motor is intended for compatible pumps that use a \u003cstrong\u003e48Y square flange motor with a threaded shaft\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eWhen replacing a pool pump motor, do not match by horsepower alone. You should also verify the frame, flange, voltage, shaft style, service factor or total horsepower, and the pump model. A motor can be the correct horsepower but still be wrong if the pump uses a different flange or shaft type.\u003c\/p\u003e\n\n\u003cdiv style=\"border-left: 5px solid #f28c28; background: #fff8f1; padding: 16px 18px; margin: 24px 0; border-radius: 8px;\"\u003e\n  \u003ch3 style=\"margin-top: 0;\"\u003eATB Fitment Tip\u003c\/h3\u003e\n  \u003cp style=\"margin-bottom: 0;\"\u003eThe HSQ165 is a \u003cstrong\u003emotor only\u003c\/strong\u003e. It does not include the pump housing, seal plate, diffuser, impeller, shaft seal, gaskets, unions, or plumbing parts. If your old motor failed, we strongly recommend replacing the shaft seal while the pump is apart to help prevent leaks into the new motor.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eWhen Should You Replace Your Pool Pump Motor?\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003eThe motor hums but will not start\u003c\/li\u003e\n  \u003cli\u003eThe motor is loud, grinding, or has failed bearings\u003c\/li\u003e\n  \u003cli\u003eThe motor overheats or shuts off during operation\u003c\/li\u003e\n  \u003cli\u003eThe breaker trips when the pump tries to start\u003c\/li\u003e\n  \u003cli\u003eThe motor shaft is seized or difficult to turn\u003c\/li\u003e\n  \u003cli\u003eThe motor has water damage from a leaking shaft seal\u003c\/li\u003e\n  \u003cli\u003eThe existing motor label matches the HSQ165 specifications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRecommended Installation Notes\u003c\/h3\u003e\n\n\u003cp\u003eWhen installing the Century HSQ165, inspect the full pump assembly before reusing old parts. A leaking shaft seal is one of the most common reasons pool pump motors fail. If the seal leaks, water can travel along the motor shaft and damage the bearings or electrical components.\u003c\/p\u003e\n\n\u003cp\u003eFor best results, replace the shaft seal, inspect the impeller, check the diffuser and diffuser O-ring, and confirm the seal plate is not cracked before installing the new motor. Always wire the motor for the correct voltage and follow all local electrical codes.\u003c\/p\u003e\n\n\u003ch3\u003eCommonly Replaced With This Motor\u003c\/h3\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePump shaft seal\u003c\/li\u003e\n  \u003cli\u003eSeal plate gasket or O-ring\u003c\/li\u003e\n  \u003cli\u003eDiffuser O-ring\u003c\/li\u003e\n  \u003cli\u003eImpeller screw or impeller hardware, if used on the pump model\u003c\/li\u003e\n  \u003cli\u003eMotor mounting bolts, if existing hardware is corroded\u003c\/li\u003e\n  \u003cli\u003eDamaged seal plate or diffuser, if cracked or warped\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eIs the Century HSQ165 a complete pool pump?\u003c\/h4\u003e\n\u003cp\u003eNo. The HSQ165 is the replacement motor only. It does not include the pump wet end, basket housing, lid, seal plate, diffuser, impeller, shaft seal, or plumbing connections.\u003c\/p\u003e\n\n\u003ch4\u003eWhat horsepower is the Century HSQ165?\u003c\/h4\u003e\n\u003cp\u003eThe Century HSQ165 is commonly listed as a 1.65 HP \/ 1.65 total horsepower pool and spa pump motor.\u003c\/p\u003e\n\n\u003ch4\u003eIs the HSQ165 115V or 230V?\u003c\/h4\u003e\n\u003cp\u003eThe HSQ165 is a dual-voltage motor rated for 115\/230V. The motor must be wired correctly for the voltage being used at the equipment pad.\u003c\/p\u003e\n\n\u003ch4\u003eIs the HSQ165 a square flange motor?\u003c\/h4\u003e\n\u003cp\u003eYes. The HSQ165 is a 48Y square flange motor with a threaded shaft. Confirm your existing motor uses the same frame and flange style before ordering.\u003c\/p\u003e\n\n\u003ch4\u003eShould I replace the shaft seal when changing the motor?\u003c\/h4\u003e\n\u003cp\u003eYes. Replacing the shaft seal is strongly recommended whenever a pool pump motor is replaced. A worn seal can leak water into the new motor and cause premature failure.\u003c\/p\u003e\n\n\u003ch4\u003eWill the HSQ165 fit my pump if the horsepower matches?\u003c\/h4\u003e\n\u003cp\u003eNot always. Horsepower is only one part of motor matching. You also need to confirm the frame, flange type, shaft type, voltage, total horsepower, and pump model.\u003c\/p\u003e\n\n\u003ch3\u003eOrder Century HSQ165 from Aqua Terra Backyard\u003c\/h3\u003e\n\n\u003cp\u003eAt Aqua Terra Backyard, we help pool owners and service professionals choose the correct replacement parts without guessing. The \u003cstrong\u003eCentury HSQ165 1.65 HP Square Flange Pool Pump Motor\u003c\/strong\u003e is a dependable replacement motor for compatible pool and spa pumps that use a 48Y square flange, threaded shaft motor.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNeed help confirming fitment?\u003c\/strong\u003e Send us a photo of your existing motor label and pump model label before ordering. We can help verify whether the HSQ165 is the correct replacement motor and recommend the proper shaft seal and pump hardware to complete the repair.\u003c\/p\u003e","brand":"Aqua Terra Backyard","offers":[{"title":"Default Title","offer_id":52379878162706,"sku":"HSQ165","price":314.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0733\/2279\/1186\/files\/CRMHSQ165_0.jpg?v=1781538603","url":"https:\/\/www.aquaterrabackyard.com\/products\/century-hsq165-1-65-hp-square-flange-pool-pump-motor","provider":"Aqua Terra Backyard","version":"1.0","type":"link"}