LiftMaster K1A6408 APE Assembly — RPM Board, Plastic Tray and Mounting Hardware

The LiftMaster K1A6408 is an APE service assembly identified in supported gate-operator repair drawings as an RPM board with a plastic tray and mounting hardware. It belongs to the operator’s position-feedback arrangement and must be selected from the exact model’s parts diagram. It is not automatically the same package as a model-specific APS encoder kit with its associated cable or mechanism. Confirm whether the repair calls for this board-and-tray assembly or a larger encoder service kit before ordering.

Compatibility — Models, Versions and Exclusions

Choose the Required Assembly, Not Just the Word Encoder

The terms APE, APS and RPM appear near one another in manufacturer parts drawings. They do not mean that every listed part contains the same hardware. A board mounted on its plastic tray may be the correct repair when that specific assembly has failed, while a damaged cable or associated encoder mechanism may require a different kit. Have the technician identify the required service reference.

Position-related faults can also arise from loose connections, damaged wiring or a mechanical problem that prevents normal travel. Record diagnostic information before replacing parts. The technician should inspect the feedback path and the gate drive together, then perform the model-specific setup after service. Replacing the board does not justify bypassing a fault or increasing force to overcome a binding gate.

Specifications and Product Identification

Before Ordering

• Record the exact operator model and the installed assembly’s part reference.
• Check the drawing for K1A6408 and distinguish nearby APS kit numbers.
• Inspect wiring, connectors and the mechanism associated with the feedback system.
• Confirm whether the required cable and other parts are supplied separately.

Package Contents and Separate Requirements

The manufacturer drawings identify the APE assembly with plastic tray, RPM board and mounting hardware. Confirm the current kit inventory before ordering. A complete operator, main control board, motor or every model-specific encoder cable is not promised as included. A diagram showing the APE beside another encoder reference should not be read as one combined package.

Safety Warnings — Read Before Installation or Service

• WARNING: Incorrect position feedback can cause unexpected or incorrect gate travel. Use a qualified gate-systems technician.
• Disconnect all applicable utility, solar and battery power, and secure the gate before servicing electronics.
• Do not bypass feedback or monitored-protection inputs to make a faulted system operate.
• Complete the prescribed setup and verify both travel endpoints, reversal and all required protection devices before normal use.

Related Products and Important Differences

• LMRRUL monitored photo eye — a separate external safety sensor; it does not supply internal position feedback.
• LMWEKITU monitored wireless edge kit — a separate edge communication system for approved controls; it is not part of the APE kit.

Frequently Asked Questions

Is this a complete APS encoder kit?

Do not assume so. The documentation identifies a board, tray and mounting hardware; model-specific APS kits are separately listed.

Is K1A6408 the same as K76-34697?

They are separate references in the CSL24UL drawing. Match the diagnosed repair and required contents rather than treating the numbers as interchangeable.

Will replacing it resolve every position fault?

No. Wiring, connections and the associated drive mechanism also need inspection.

Can I use a residential RPM sensor instead?

No universal substitution is established. Residential opener sensors have different service references and arrangements.

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.