The LiftMaster K74-36798-4 plastic control box is the replacement enclosure used to protect LiftMaster LA500U series swing gate control electronics. The enclosure is the outer shell that keeps the control electronics, battery area, accessory wiring, reset switch assembly and mounting hardware organized and protected in an outdoor gate environment. When the box is cracked, sun-brittle, warped or water damaged, the operator electronics become much more vulnerable to corrosion and nuisance failures.
This part should be matched by exact part number and operator generation. The LA400, LA412, LA500 and newer U/UL control boxes can look similar from the outside, but hinge locations, internal brackets, reset switch positions, wiring exits and lid hardware may differ. This listing should be treated as the plastic enclosure only unless the supplier states otherwise; it does not normally include the main control board, batteries, transformer, radio receiver, charger or accessory wiring.
| Specification | Details |
|---|---|
| Manufacturer | LiftMaster |
| Product Type | Plastic Control Box Enclosure |
| Part Number | K74-36798-4 |
| Application | Replacement housing for LA500U swing gate operator control box |
| Compatible Operator Type | LiftMaster DC swing gate operators |
| Included Components | Control box housing only unless otherwise stated |
| Notes | Match the exact operator model and parts diagram before ordering |
This is a housing part. When transferring parts from the old box, inspect the control board, battery leads, reset switch, harnesses, outlet or transformer area, accessory wiring and safety-device wiring for corrosion or heat damage.
This enclosure work involves the operator control compartment. Disconnect power, secure the gate, and use a qualified gate technician if wiring, batteries, safety devices, or line-voltage connections need to be moved.
No. It should be treated as the plastic control box housing only unless the supplier specifically states that electronics are included.
This part is listed for LA500U swing gate operator control box applications. Match the model suffix and parts diagram.
LA400, LA412, LA500, LA400U and LA500U enclosures may look similar but can use different internal layouts and part numbers.
Only if the electronics and wiring are clean, dry and undamaged. Water-damaged or corroded components should be inspected before reuse.
It restores the proper enclosure when installed correctly, but lid seals, cable routing, conduit entries and mounting hardware must also be in good condition.