LiftMaster Q250 / K20-1050C-1T Motor — 1/2 HP, Legacy HCT

The LiftMaster Q250 identifies the K20-1050C-1T half-horsepower replacement motor used in documented legacy HCT overhead-gate arrangements. Manufacturer parts information distinguishes the post-February-1999 motor reference from the earlier motor listed for the same family. Confirm the actual installed motor, drive connection and production configuration before ordering. This is a motor service item, not a complete overhead operator or a replacement selected solely by the HCT name; later HCTDCU equipment and other half-horsepower motors use their own service references.

Compatibility — Models, Versions and Exclusions

Match the Mounting and Motor Wiring Before Ordering

Record the operator identification and the full label on the installed motor, then compare the actual mounting and drive connection with the correct HCT diagram. The manufacturer’s production-era distinction matters, but an old operator may also have been repaired or modified. Treat the installed parts and current approved service information together rather than relying only on a date or a handwritten motor description.

Have qualified personnel inspect the power circuit, capacitor where fitted, gearbox and mechanical load before replacing the motor. An overhead gate that binds or has counterbalance damage can produce symptoms that resemble motor failure. Restore the intended transmission and electrical arrangement without changing ratios or guessing lead connections. Complete the prescribed travel and safety checks after repair.

Specifications and Product Identification

Before Ordering

• Record the full HCT model, production information and motor label.
• Match Q250 / K20-1050C-1T to the installed configuration.
• Compare mounting, shaft and electrical connections.
• Inspect the overhead gate and drive for the underlying fault.

Package Contents and Separate Requirements

This listing identifies the replacement motor. A pulley, belt, capacitor, brake, gearbox, wiring harness or complete operator is not promised as included. Confirm the current supplier package against the repair requirements. A parts illustration may show the motor beside these components without including them in the motor carton. Retain only hardware that the service instructions permit to be reused and that the technician finds serviceable.

Safety Warnings — Read Before Installation or Service

• WARNING: A moving commercial door and exposed overhead gate motor and connected drive can cause serious injury or death. Have a trained door-systems technician perform installation and service.
• Disconnect mains power and any battery backup before mechanical work or wiring. Secure the door against unexpected movement as directed by its manufacturer.
• Do not work on springs, cables or counterbalance components without appropriate training. Never bypass safety sensors or increase force to overcome binding.
• Restore guards and complete the model-specific travel, reversal and protection-device tests before returning the door to normal operation.

Related Products and Important Differences

• LMRRUL monitored photo eye — a separate protection option only where the exact operator and control revision approve it; not a universal legacy retrofit.
• LMWEKITU monitored wireless edge kit — a separate edge communication system for approved controls and resistive edges; not a replacement for this mechanical or electrical service part.

Frequently Asked Questions

Does this fit every HCT operator?

No. Manufacturer parts information distinguishes the post-February-1999 motor arrangement.

Is HCTDCU the same application?

No. That later DC platform requires its own service reference.

Is horsepower enough to select a replacement?

No. Mounting, supply, shaft and the complete motor number must match.

Does a new motor correct a counterbalance fault?

No. The door or overhead gate mechanism requires separate professional repair.

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.