LiftMaster K74-50278 (Elite Q403) Electronic Box Assembly

Replacement Electronic Box Assembly for SL3000 / CSW200

The LiftMaster K74-50278 (Elite Q403) is a genuine electronic box assembly used on select LiftMaster ELITE swing and slide gate operators. It is commonly referenced as Elite Q403 and may also be listed as Q402 depending on the operator configuration and parts breakdown. This assembly is used to restore a damaged or missing electronics enclosure and related internal connections so the operator can be serviced and returned to proper operation. Always confirm fitment using the operator manual or replacement parts diagram before ordering.

Note: control board, wire harnesses are not included.

Key Features

• Genuine LiftMaster ELITE replacement electronic box assembly
• Used on select ELITE swing and slide gate operator systems (verify by model and parts diagram)
• Common alternate reference: Q402 (model dependent)
• Designed as a direct replacement to restore a proper electronics mounting and service enclosure
• Helps protect internal operator electronics from exposure and tampering when the original box is compromised

Technical Specifications

• Part Number: K74-50278
• Also Known As: Elite Q403, Q402
• Component Type: Electronic box assembly
• Operator Compatibility: ELITE SL3000, ELITE CSW200 (model dependent, verify by parts diagram)
• Authenticity: Genuine LiftMaster replacement part
  

Conclusion

If your ELITE operator needs a replacement electronic box assembly due to damage or wear, the LiftMaster K74-50278 (Elite Q403) is the correct OEM part to restore the operator’s electronics enclosure and serviceability. Confirm compatibility by referencing the correct manual or parts breakdown for your specific operator configuration.