LiftMaster K77-39428 Operator Cover — CSW24UL Swing-Gate Operator

The LiftMaster K77-39428 is the operator-cover service assembly identified for the CSW24UL swing-gate operator. The manufacturer drawing describes the cover with labels, keys and lock assembly, while identifying the front cover separately as K77-39425. Match the installed enclosure and mounting points before ordering. This cover belongs to the swing-operator arrangement; a similar-looking CSL24UL slide-operator cover or an older CSW24U cover should not be substituted without documented compatibility.

Compatibility — Models, Versions and Exclusions

Identify the Panel Damage and the Enclosure Revision

Photograph the damaged cover, access area, mounting points and operator label before ordering. A vehicle impact can distort the underlying chassis even when the visible damage seems limited to the outer cover. A new shell should not be forced onto bent supports or used to hide damaged wiring or internal components.

The labels and locking arrangement are part of the enclosure’s intended service configuration. Confirm that the delivered assembly matches the operator and permits normal service access. The front cover has its own reference in the diagram, so ask specifically about that component if it is missing or damaged. Do not infer its inclusion solely from a catalog photograph of a complete operator.

Specifications and Product Identification

Before Ordering

• Confirm the model is CSW24UL and identify its enclosure revision.
• Determine whether the main cover, front cover or both need replacement.
• Inspect the chassis, attachment points and internal components after any impact.
• Confirm the current package for labels, lock assembly, keys and mounting pieces.

Package Contents and Separate Requirements

The manufacturer describes K77-39428 as the operator cover with labels, keys and lock assembly. Verify that inventory in the current supplier offer. K77-39425 is separately identified as the front cover, so its inclusion must not be assumed. The motor, boards, batteries, chassis and complete operator are not included in a cover-only service order.

Safety Warnings — Read Before Installation or Service

• WARNING: A missing or damaged enclosure may expose moving parts and hazardous electrical components. Keep unauthorized people away and use a qualified gate technician for service.
• Isolate AC, battery and any solar power as applicable before removing or fitting the cover.
• Inspect for hidden impact damage and avoid pinching wiring or obstructing moving parts when restoring the enclosure. Do not force a cover onto distorted supports.
• Secure all required panels and guards, preserve warning labels and verify safe gate operation before returning the entrance to use.

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 this for a swing or slide operator?

The verified application is the CSW24UL swing-gate operator.

Are labels, keys and a lock identified by LiftMaster?

Yes, in the repair-diagram description. Confirm the current supplier package matches that inventory.

Is the front cover automatically included?

K77-39425 is separately identified in the diagram. Confirm the exact carton contents before ordering.

Will a replacement cover repair impact damage inside?

No. Inspect the chassis, wiring and arm mechanism independently after an impact.

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.