LiftMaster Q123 / K20-9012B-1 Replacement Gate Motor — 12V DC
LiftMaster Q123 / K20-9012B-1 Replacement Gate Motor — 12V DC
The LiftMaster Q123 supplier SKU identifies motor K20-9012B-1, a 12V DC replacement used in documented LiftMaster gate-drive arrangements. Manufacturer parts information identifies this motor in the legacy RSW12V / RSW12VH platform and in the DC2000CSW backup-drive assembly. Select it by the motor part number and the actual drive configuration, not merely by the gate’s brand or the presence of a 12V battery. This motor is a service component, not a complete battery-backup conversion kit.
Compatibility — Models, Versions and Exclusions
| Model or selection point | Compatibility requirement |
|---|---|
| RSW12V / RSW12VH | Manufacturer replacement-parts documentation identifies this exact motor. |
| DC2000CSW assembly | The motor is one component of the documented backup-drive system. |
| Other DC2000 or slide-gate applications | Confirm the specific parts diagram before ordering; a shared accessory name is insufficient. |
| 24V DC motors | Not an established substitute; voltage, shaft and mounting requirements must match. |
| Main AC motor on a legacy CSW operator | Do not confuse the backup-drive motor with the operator’s separate AC motor. |
Identify Which Motor the Repair Requires
A legacy installation may have more than one motor function. The primary drive and an optional battery-backup arrangement can use different motors, belts, brackets and controls. A photograph of the operator cover will not resolve that distinction. Record the label on the failed motor and compare its mounting and drive connection with the applicable service drawing.
A gate that fails during a power outage does not automatically have a failed backup motor. Battery condition, charging, wiring, controller operation and the mechanical drive all need diagnosis. Similarly, a motor should not be replaced to compensate for a gate that binds or a reducer that is difficult to turn. Correct the underlying fault so the replacement is not subjected to the same abnormal load.
Specifications and Product Identification
| Specification | Details |
|---|---|
| Supplier SKU | Q123 |
| Manufacturer motor reference | K20-9012B-1 |
| Electrical rating | 12V DC |
| Product role | Replacement drive motor |
| Documented examples | RSW12V / RSW12VH; DC2000CSW backup drive |
Before Ordering
- Match K20-9012B-1 to the installed motor and service diagram.
- Confirm 12V DC supply and the correct main-drive or backup-drive role.
- Inspect the related pulley, belt, coupling or mounting arrangement.
- Check the batteries, wiring and controller before concluding the motor has failed.
Package Contents and Separate Requirements
The listing identifies the replacement motor. A battery set, DC2000 controller, mounting plate, pulleys, belts and complete wiring harness are not promised as included. Confirm the current carton for any motor-specific hardware. If adding backup operation to an existing gate rather than repairing an installed system, obtain the complete documented conversion requirements instead of purchasing a motor alone.
Safety Warnings — Read Before Installation or Service
- WARNING: A moving gate and exposed motor and drive components can cause serious injury. Installation and service require a qualified gate-systems technician.
- Isolate AC power, batteries and any solar supply as applicable, and secure the gate against unexpected movement before work begins.
- Keep people clear of the gate and drive during supervised testing. Never bypass required entrapment-protection devices or increase force to overcome a mechanical fault.
- Restore all covers and guards, then verify travel endpoints, reversal and every required safety device before returning the gate 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
Is Q123 the manufacturer part number?
Q123 is the supplier ordering SKU; the captured supplier record maps it to K20-9012B-1.
Does a 12V battery prove that this motor fits?
No. Battery voltage alone does not establish motor voltage, mounting, control or mechanical compatibility.
Does it replace the AC motor in a CSW backup installation?
Not by that description alone. Identify whether the failed component belongs to the AC drive or the separate DC backup drive.
Will a motor alone add battery backup?
No. Backup operation requires the correct controller, batteries, wiring and drive components for the documented system.
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.
Details
Need Help With Compatibility?
Not sure if this is the correct part for your garage door, operator, gate system, or application? Contact Us before ordering — we’re happy to help.
Garage-DoorParts.com carries a large selection of residential and commercial parts, and many components can look similar while having important differences in dimensions, model numbers, voltage, mounting, or compatibility.
For the best assistance, please provide as much information as possible, including the manufacturer, model number, part number, door or operator type, dimensions, and clear photos of the existing part or equipment.
Our goal is to help you identify the correct product before you order and reduce the possibility of ordering an incompatible part.
Contact Us with your product questions and compatibility information, and we’ll do our best to point you in the right direction.
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