LiftMaster Q032 / K75-50101 Gate Limit Adjustment Nut

The LiftMaster Q032 is a mechanical limit adjustment nut identified by the supplier as manufacturer part K75-50101. It belongs to the documented limit-shaft arrangement in applicable legacy slide-gate operators and is separately identified within the Q024 limit-switch kit breakdown. Select it by the exact service reference and installed mechanism. It is not the electrical limit switch, a complete limit assembly or the Q238 cam used in another adjustment arrangement. Reliable stopping requires the nut, shaft, retention and switch mechanism to work together.

Compatibility — Models, Versions and Exclusions

Inspect the Nut, Shaft and Retention Together

A limit nut operates as part of a mechanism that establishes a travel endpoint. Damage or looseness elsewhere in that mechanism can produce the same unreliable stopping symptom as a worn nut. Have the technician inspect the shaft, nut retention, switch operation and related drive parts before selecting the repair. Replacing the nut alone will not correct a damaged shaft or failed electrical switch.

Photograph the assembly before disassembly and identify the exact operator generation. Older gate equipment may have been modified during previous service, so the cabinet name alone may not identify the installed limit mechanism. Follow the model-specific adjustment procedure after repair; do not move the stopping point simply to compensate for a gate that binds or an incorrectly installed drive.

Specifications and Product Identification

Before Ordering

• Record the operator model and installed limit assembly.
• Match Q032 / K75-50101 in the applicable parts breakdown.
• Inspect the limit shaft, retention hardware and electrical switches.
• Confirm whether the repair needs an individual nut or the larger Q024 kit.

Package Contents and Separate Requirements

This listing identifies the limit adjustment nut. A shaft, sprocket, electrical switch, bearing kit or complete limit assembly is not promised as included. Confirm the current carton and required quantity before ordering. A manufacturer drawing that shows the nut within a larger kit does not establish that all of those neighboring parts ship under Q032.

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 an electrical limit switch?

No. Q032 is the mechanical adjustment nut. The electrical switch is a separate part of the limit arrangement.

Is it the same as Q238?

No interchangeable fit is established. Q238 maps to K75-50339 and belongs to a different documented adjustment arrangement.

Does buying Q032 supply the complete Q024 assembly?

No. Q024 / K75-50097 is a separately identified kit with a broader repair scope.

Can I operate the gate with an unreliable limit nut?

Keep it out of normal service until the mechanism is repaired and the required travel and safety tests pass.

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.