LiftMaster Q082 / K13-50140 Limit Nut — Legacy HCT

The LiftMaster Q082 supplier SKU identifies the K13-50140 limit-nut service item for documented legacy HCT overhead-gate operator arrangements. The HCT parts list names it separately from the limit-switch bolt, electrical switch and complete trolley. Match the installed limit mechanism and exact repair drawing before ordering. A travel nut helps establish the specified switch-actuation position; it is not a safety sensor or a substitute for diagnosing a gate that stops inconsistently because of wiring, switch wear or another mechanical fault.

Compatibility — Models, Versions and Exclusions

Check the Nut, Retention and Limit Actuation

Record the full HCT model and photograph the limit mechanism before disturbing adjustment. Have the technician identify wear in the nut, mating bolt, retention and switch-actuation surfaces. A nut that shifts or fails to actuate a switch can be only part of a larger problem. Do not choose a generic nut solely because it appears to fit the thread or reaches the same position.

Restore the documented retention and adjustment arrangement rather than adding improvised locking hardware. A correct replacement still needs the model-specific travel-setting procedure. After service, verify both endpoints and the operator’s response throughout the complete movement, then test reversal and required entrapment protection separately. A continuity check at the switch or a visible nut position alone does not demonstrate safe operation of the whole gate.

Specifications and Product Identification

Before Ordering

• Record exact HCT model and limit arrangement.
• Match Q082 to K13-50140.
• Inspect bolt, retention and switch actuation.
• Confirm package quantity and required post-repair travel setup.

Package Contents and Separate Requirements

This offer identifies the Q082 /K13-50140 limit-nut service item. Confirm current supplied quantity and any retention pieces before ordering. The limit-switch bolt, electrical switch, shaft assembly, trolley, control board and complete operator are not promised as included. The number of nuts shown in the operator diagram describes the machine and should not automatically be treated as the quantity in the individual sales package.

Safety Warnings — Read Before Installation or Service

• WARNING: A faulty or incorrectly installed limit switch can allow dangerous travel beyond the intended stopping point. Use a qualified gate-systems technician.
• Isolate all applicable power sources and secure the gate before touching the switch or wiring.
• Never bridge a limit switch to restore normal operation. Keep the gate out of service until unreliable stopping is corrected.
• After service, perform the prescribed limit setup and verify both endpoints, reversal and all required protection devices.

Related Products and Important Differences

• LMRRUL monitored photo eye — a separate safety accessory only where the installed control system approves it; not a replacement limit switch.
• LMWEKITU monitored wireless edge kit — a separate protection-system component with its own compatibility requirements; it does not establish travel endpoints.

Frequently Asked Questions

Is this the electrical switch?

No. It is the mechanical limit nut.

Is the mating bolt included?

Q081 is separately identified; confirm the current package.

Is it the same as Q032?

No. The exact service references differ.

Must travel be checked afterward?

Yes. Follow the exact HCT endpoint and safety-test procedure.

Need Help Confirming the Right Product?

Contact Garage-DoorParts.com before ordering. 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.