{"product_id":"liftmaster-la400dc","title":"LiftMaster LA400DC Primary 24V DC Swing Gate Actuator Arm","description":"\u003cp\u003e\u003cstrong\u003eThe LiftMaster LA400DC is the primary 24V DC actuator arm used in compatible LiftMaster LA400 swing-gate systems. It moves the gate leaf through the system’s approved bracket arrangement and connects to a compatible control box. This is the primary-arm reference, distinct from the LA400DCS secondary arm and the LA400PKGUL system package. It is suited to a replacement purchase only after the arm, controls, mounting geometry and gate condition have been checked together; system accessories and exact carton contents must be confirmed separately.\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\u003eLA400DC\u003c\/td\u003e\n\u003ctd\u003ePrimary actuator arm for the appropriate LA400 control system.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLA400DCS\u003c\/td\u003e\n\u003ctd\u003eSecondary arm reference for supported dual-gate arrangements; a distinct order number.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLA400PKGUL\u003c\/td\u003e\n\u003ctd\u003eSystem-package reference; not the same offer as this arm.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOlder LA400 control boxes\u003c\/td\u003e\n\u003ctd\u003eCheck the exact actuator\/control combination rather than assuming all generations interchange.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLA500 or another actuator family\u003c\/td\u003e\n\u003ctd\u003eNo cross-family substitution is established.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eWhat the Installer Should Evaluate Before Replacing an Arm\u003c\/h2\u003e\u003cp\u003eThe gate leaf, hinges, posts and brackets are part of the operating system. A binding gate or damaged support can put an otherwise correct actuator under abnormal load. Replacing the arm without correcting the mechanical cause may leave poor operation unresolved. Provide the gate dimensions and clear views of the existing mounting arrangement along with the model labels.\u003c\/p\u003e\u003cp\u003eFor a new installation, the arm is only one purchasing decision. The control system, power arrangement, brackets, access controls and protection devices must form an approved combination. For a replacement, confirm which existing components can be retained. Exact cable and bracket contents for this supplier offer need confirmation; do not use a system-package photograph as proof that those items come with the arm.\u003c\/p\u003e\u003ch2\u003eArm or Complete Package?\u003c\/h2\u003e\u003cp\u003eLA400DC identifies the primary actuator arm. LiftMaster uses LA400PKGUL for a single-arm system package and LA400DCS for the secondary actuator in a dual-gate arrangement. Confirm the exact package when ordering a new system or replacing an existing arm.\u003c\/p\u003e\u003ch2\u003eSpecifications\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\u003eModel\u003c\/td\u003e\n\u003ctd\u003eLA400DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eComponent\u003c\/td\u003e\n\u003ctd\u003ePrimary linear actuator arm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMotor platform\u003c\/td\u003e\n\u003ctd\u003e24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eCompatible vehicular swing gates\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelated secondary arm\u003c\/td\u003e\n\u003ctd\u003eLA400DCS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRelated system package\u003c\/td\u003e\n\u003ctd\u003eLA400PKGUL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eCapacity Depends on Gate Length\u003c\/h2\u003e\u003cp\u003eLiftMaster’s LA400PKGUL product guide pairs the LA400DC arm with recommended gate capacities of 850 lb at 10 ft, 750 lb at 12 ft, 650 lb at 14 ft and 550 lb at 16 ft. These are length-and-weight combinations, not a claim that a 16-foot gate can weigh 850 pounds. Confirm the current system manual and complete installation conditions before selection.\u003c\/p\u003e\u003ch2\u003eReplacement Checklist\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eMatch the actuator and control-box model labels.\u003c\/li\u003e\n\u003cli\u003eCheck the gate length, weight and condition.\u003c\/li\u003e\n\u003cli\u003eConfirm bracket geometry and the intended opening direction.\u003c\/li\u003e\n\u003cli\u003eVerify the arm connection and the manufacturer-approved control system.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eCan I use this as the secondary arm on a double gate?\u003c\/h3\u003e\u003cp\u003eLiftMaster specifies LA400DCS as the secondary arm. Confirm the required primary or secondary position before ordering.\u003c\/p\u003e\u003ch3\u003eDoes the arm alone provide smartphone control or battery backup?\u003c\/h3\u003e\u003cp\u003eThose functions depend on the complete compatible control system, power arrangement and accessories. An arm-only purchase does not establish those features.\u003c\/p\u003e\u003ch2 class=\"safety-warning\"\u003eSafety Warnings — Read Before Installation or Service\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWARNING: Moving swing gates can trap or crush people and cause serious injury or death. Installation and service require a trained gate-systems technician.\u003c\/li\u003e\n\u003cli\u003eThis actuator is for an approved vehicular gate system. Provide pedestrian access separately; do not use the moving vehicle gate as a pedestrian entrance.\u003c\/li\u003e\n\u003cli\u003eSecure the gate leaf and isolate all power before disconnecting the arm. Gate weight and free movement must remain controlled during service.\u003c\/li\u003e\n\u003cli\u003eProtect identified entrapment zones. Do not bypass monitored sensors or increase force to overcome a binding gate. Complete setup and safety tests before 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-gate-logic-board\"\u003eK001A6039 LA400 control board\u003c\/a\u003e — an older control reference to compare when identifying the installed system; it is not automatically the correct board for every LA400DC arm.\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 way to connect compatible resistive edges on approved systems. The kit is separate from the actuator and requires edge sensors.\u003c\/li\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 non-contact protection option when listed by the exact operator manual; placement depends on the site’s entrapment zones.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eMore Questions Before Ordering\u003c\/h2\u003e\u003ch3\u003eCan an arm replacement fix a sagging or binding gate?\u003c\/h3\u003e\u003cp\u003eNo. Structural and hinge problems must be corrected first. An actuator should move a mechanically suitable gate, not compensate for damaged supports.\u003c\/p\u003e\u003ch3\u003eHow do I confirm what comes in this arm shipment?\u003c\/h3\u003e\u003cp\u003eAsk for the current LA400DC supplier carton contents, including cable and bracket details. The LA400PKGUL system-package inventory should not be applied to this separate SKU.\u003c\/p\u003e\u003ch2\u003eNeed Help Confirming the Right Part?\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 operator model, readable part labels and photographs of the installed assembly. Include dimensions or the control-box model where relevant. We can help compare the listing with the information you provide; final installation suitability should be confirmed by the servicing technician.\u003c\/p\u003e","brand":"LiftMaster","offers":[{"title":"Default Title","offer_id":60655764111646,"sku":"LA400DC","price":836.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/2781\/5710\/files\/la400dc-2.png?v=1793139840","url":"https:\/\/garage-doorparts.com\/products\/liftmaster-la400dc","provider":"garage-doorparts.com","version":"1.0","type":"link"}