{"product_id":"liftmaster-k75-39337","title":"LiftMaster K75-39337 LA500 Trolley Nut \/ Traveler Carriage Service Kit","description":"\u003cp\u003e\u003cstrong\u003eThe LiftMaster K75-39337 is the trolley-nut service kit for the documented LA500 actuator-arm repair procedure. The supplier calls it a traveler carriage kit, while the manufacturer identifies the trolley nut and additional service pieces for damage associated with an impact or similar event. This is an internal arm repair, not a complete replacement actuator. Select it after the arm, drive screw and related components have been inspected, and review the manufacturer’s warranty guidance before deciding between a component repair and replacement of the arm.\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\u003eLA500 arm covered by the service instructions\u003c\/td\u003e\n\u003ctd\u003eVerify the installed arm and applicable kit revision.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLA400 \/ LA412 actuators\u003c\/td\u003e\n\u003ctd\u003eDifferent arms; no interchangeability established.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComplete LA500DC actuator\u003c\/td\u003e\n\u003ctd\u003eA different purchase scope; this kit does not provide a complete arm.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDamaged drive screw or misaligned drivetrain\u003c\/td\u003e\n\u003ctd\u003eRequires assessment beyond replacing the trolley nut.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eArms still under warranty\u003c\/td\u003e\n\u003ctd\u003eManufacturer advises considering arm replacement because this procedure may affect warranty coverage.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eEvaluate Impact Damage Before Opening the Actuator\u003c\/h2\u003e\u003cp\u003eThe manufacturer describes this repair for a trolley nut damaged by a vehicle strike or a similar event. Such damage may extend beyond the nut itself. Have the technician inspect the arm, gate attachments, housing and drivetrain before selecting a repair scope. A component kit should not be used to conceal a bent assembly or a gate geometry problem.\u003c\/p\u003e\u003cp\u003eThe service instructions emphasize tight factory tolerances and a clean working environment. Preserving alignment, seals and retained hardware matters throughout the repair. This is not a simple external bolt-on replacement. Review the complete procedure and equipment needed before disassembly, then complete the required setup and safety testing with the repaired arm installed in the approved system.\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\u003ePart number\u003c\/td\u003e\n\u003ctd\u003eK75-39337\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer kit name\u003c\/td\u003e\n\u003ctd\u003eTrolley nut service kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupplier description\u003c\/td\u003e\n\u003ctd\u003eTraveler carriage service kit for LA500\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDocumented equipment\u003c\/td\u003e\n\u003ctd\u003eLA500 actuator arm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRepair setting\u003c\/td\u003e\n\u003ctd\u003eClean shop with personnel qualified for the procedure\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRepair scope\u003c\/td\u003e\n\u003ctd\u003eInternal trolley nut and documented supporting service components\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\u003eIdentify the exact LA500 arm and service-kit revision.\u003c\/li\u003e\n\u003cli\u003eInspect the gate and actuator for additional impact damage.\u003c\/li\u003e\n\u003cli\u003eReview warranty status and the manufacturer’s arm-replacement guidance.\u003c\/li\u003e\n\u003cli\u003eConfirm the complete kit inventory, retained hardware and required shop procedure.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003ePackage Contents and Separate Requirements\u003c\/h2\u003e\u003cp\u003eThe manufacturer inventory identifies a trolley nut and additional pieces such as bearing and retention components, trolley plates, a base plate, arm gasket and fasteners. Confirm the current carton against the kit instructions rather than assuming every internal arm part is supplied. A complete motor, drive screw, control box and replacement actuator are not promised as included.\u003c\/p\u003e\u003ch2 class=\"safety-warning\"\u003eSafety Warnings — Read Before Installation or Service\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWARNING: A disconnected actuator can leave the gate free to move. Secure the gate and use a qualified gate technician before removing or servicing the arm.\u003c\/li\u003e\n\u003cli\u003eDisconnect power and battery as directed before service. Keep the work area clean and prevent unintended movement during any prescribed testing.\u003c\/li\u003e\n\u003cli\u003eDo not force or modify tightly aligned drivetrain parts to approximate the original fit. Preserve seals and the specified assembly method.\u003c\/li\u003e\n\u003cli\u003eComplete the manufacturer’s recommissioning, travel, reversal and entrapment-protection tests before returning the gate to use.\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\u003eIs this a complete replacement actuator?\u003c\/h3\u003e\u003cp\u003eNo. It is an internal trolley-nut service kit for the documented LA500 repair.\u003c\/p\u003e\u003ch3\u003eDoes it fit LA400 or LA412?\u003c\/h3\u003e\u003cp\u003eNo compatibility is established for those different actuator families.\u003c\/p\u003e\u003ch3\u003eCan a new nut repair every arm damaged by a vehicle?\u003c\/h3\u003e\u003cp\u003eNo. The housing, drive screw, attachments and alignment need inspection for additional damage.\u003c\/p\u003e\u003ch3\u003eCould this repair affect an existing warranty?\u003c\/h3\u003e\u003cp\u003eThe manufacturer warns that the procedure may affect arm warranty coverage and advises considering arm replacement while covered.\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":"LiftMaster","offers":[{"title":"Default Title","offer_id":60655783280926,"sku":"K75-39337","price":231.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/2781\/5710\/files\/k75-39337.jpg?v=1793139968","url":"https:\/\/garage-doorparts.com\/products\/liftmaster-k75-39337","provider":"garage-doorparts.com","version":"1.0","type":"link"}