{"product_id":"liftmaster-q074","title":"LiftMaster Q074 \/ K75-50130 Coupling — 3\/4 × 5\/8 Inch, Legacy HCT","description":"\u003cp\u003e\u003cstrong\u003eThe LiftMaster Q074 identifies coupling K75-50130 for documented legacy HCT overhead gate-operator arrangements. The HCT manufacturer parts list describes a 3\/4-by-5\/8-inch coupling with three pieces. Select it by the exact drive and service reference, not merely by the two listed dimensions. This is a mechanical connection component, separate from the gearbox, motor and chain-coupling release. Inspect the mating shafts, supports and alignment before choosing the repair so a new coupling is not installed onto damaged or mismatched connections.\u003c\/strong\u003e\u003c\/p\u003e\u003ch2\u003eCompatibility — Models, Versions and Exclusions\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eModel or selection point\u003c\/th\u003e\n\u003cth\u003eCompatibility requirement\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eLegacy HCT arrangements specifying Q074\u003c\/td\u003e\n\u003ctd\u003eMatch the actual shaft connections and model-specific drawing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLater HCTDC systems\u003c\/td\u003e\n\u003ctd\u003eDifferent generation; no automatic interchangeability.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQ069 flexible coupling\u003c\/td\u003e\n\u003ctd\u003eDifferent service reference and application selection.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQ200 chain-coupling release\u003c\/td\u003e\n\u003ctd\u003eSeparate mechanism and repair scope.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOther similarly sized couplings\u003c\/td\u003e\n\u003ctd\u003eDimensions alone do not establish approved connection or retention.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eIdentify the Connection Before Choosing a Coupling\u003c\/h2\u003e\u003cp\u003eA coupling connects specific mating parts, so the correct repair depends on more than the operator brand. Record the installed part number where available and photograph the connection before dismantling. Compare the shaft interfaces, axial position and retention arrangement with the applicable service drawing. Do not infer an unlisted bore or torque rating from a catalog photograph or from the size of a nearby motor.\u003c\/p\u003e\u003cp\u003eA damaged coupling can be associated with wear, looseness, misalignment or excessive mechanical load elsewhere in the drive. Have the technician inspect the mating shafts, supports and connected mechanism before replacing it. A new coupling should not be used to hide a worn shaft connection or force a gate that binds. Correct the underlying problem and preserve the manufacturer’s intended drive geometry.\u003c\/p\u003e\u003ch2\u003eSpecifications and Product Identification\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupplier SKU\u003c\/td\u003e\n\u003ctd\u003eQ074\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer reference\u003c\/td\u003e\n\u003ctd\u003eK75-50130\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComponent\u003c\/td\u003e\n\u003ctd\u003eDrive coupling\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePublished size description\u003c\/td\u003e\n\u003ctd\u003e3\/4 × 5\/8 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer package description\u003c\/td\u003e\n\u003ctd\u003eThree pieces\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDocumented platform\u003c\/td\u003e\n\u003ctd\u003eLegacy HCT; match generation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eBefore Ordering\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRecord the full HCT model and drive configuration.\u003c\/li\u003e\n\u003cli\u003eMatch Q074 \/ K75-50130 and the 3\/4 × 5\/8-inch description.\u003c\/li\u003e\n\u003cli\u003eInspect both mating shafts, supports and alignment.\u003c\/li\u003e\n\u003cli\u003eConfirm the three-piece service package and required retention hardware.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003ePackage Contents and Separate Requirements\u003c\/h2\u003e\u003cp\u003eThe HCT parts list describes Q074 as a three-piece coupling. Confirm the current K75-50130 package against the installed arrangement before service. A motor, gearbox, shaft, chain-coupling release and complete operator are not promised as included. Do not transfer the contents or dimensions of another Q-series coupling to this kit simply because the supplier names are similar.\u003c\/p\u003e\u003ch2 class=\"safety-warning\"\u003eSafety Warnings — Read Before Installation or Service\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWARNING: Removing a drive coupling may disconnect the gate from its motor or restraint. A qualified gate technician must secure the gate before service.\u003c\/li\u003e\n\u003cli\u003eIsolate AC power, batteries and other applicable supplies before working around rotating shafts or coupling components.\u003c\/li\u003e\n\u003cli\u003eDo not enlarge bores, improvise keys or use flexible components to compensate for damaged supports or excessive misalignment.\u003c\/li\u003e\n\u003cli\u003eRestore retention hardware and guards, then verify controlled movement, travel endpoints, reversal and all required protection devices before normal operation.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eRelated Products and Important Differences\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/garage-doorparts.com\/products\/liftmaster-lmrrul-monitored-retro-reflective-photo-eye\"\u003eLMRRUL monitored photo eye\u003c\/a\u003e — a separate protection option only where the exact operator and control revision approve it; not a universal legacy retrofit.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/garage-doorparts.com\/products\/liftmaster-lmwekitu-monitored-wireless-edge-kit-for-gate-operators\"\u003eLMWEKITU monitored wireless edge kit\u003c\/a\u003e — a separate edge communication system for approved controls and resistive edges; not a replacement for this mechanical or electrical service part.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eWhat are the listed dimensions?\u003c\/h3\u003e\u003cp\u003eThe manufacturer HCT parts list describes 3\/4 × 5\/8 inch.\u003c\/p\u003e\u003ch3\u003eHow many pieces are described?\u003c\/h3\u003e\u003cp\u003eThe legacy HCT parts list specifies three pieces; confirm the current package.\u003c\/p\u003e\u003ch3\u003eIs it the Q200 release?\u003c\/h3\u003e\u003cp\u003eNo. Q200 is a separately identified chain-coupling release.\u003c\/p\u003e\u003ch3\u003eWill it fit later HCTDC operators?\u003c\/h3\u003e\u003cp\u003eNo automatic compatibility is established; use their own parts references.\u003c\/p\u003e\u003ch2\u003eNeed Help Confirming the Right Product?\u003c\/h2\u003e\u003cp\u003e\u003ca href=\"https:\/\/garage-doorparts.com\/pages\/contact\"\u003eContact Garage-DoorParts.com before ordering\u003c\/a\u003e. Send the full equipment model, readable part labels and photographs of the installed assembly. Include the dimensions, electrical configuration or accessory details relevant to your project so the listing can be checked against the actual installation.\u003c\/p\u003e","brand":"Controlled products","offers":[{"title":"Default Title","offer_id":60723373015326,"sku":"Q074","price":135.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/2781\/5710\/files\/q074.jpg?v=1793244846","url":"https:\/\/garage-doorparts.com\/products\/liftmaster-q074","provider":"garage-doorparts.com","version":"1.0","type":"link"}