LiftMaster K74-36798-6 Plastic Control Box for LA412U Swing Gate Operators
The LiftMaster K74-36798-6 is the standard plastic replacement control box used on select LA412U series solar swing gate operator systems. On these installations, the control box is the outdoor enclosure that keeps the logic board, battery area, reset wiring, antenna lead, and related control connections organized and protected. A damaged enclosure may not stop the operator immediately, but it can allow water, insects, sun exposure, and loose wiring to create hard-to-diagnose failures over time.
This is an enclosure service part, not a complete operator and not a universal electronics upgrade. The internal board, battery, harnesses, antenna, and reset switch should be confirmed separately unless the current listing or kit specifically includes them. Correct fitment matters because the LA412U solar control layout is different from many LA400, LA500, and non-solar LiftMaster actuator systems. Match the part number from the parts breakdown whenever possible.
Compatible With
Use with select LiftMaster LA412U series solar swing gate operator applications where the parts diagram calls for K74-36798-6.
- LiftMaster LA412U solar swing gate operators
- LiftMaster LA412UL solar swing gate operators
- Select LA412 Series linear actuator systems using the matching plastic control box
- Solar-powered swing gate installations using the LA412U control box layout
- Not a confirmed replacement for LA400, LA500U, CSW, RSW, or non-LA412 control boxes
Features and Specifications
| Specification | Details |
|---|
| Manufacturer | LiftMaster |
| Product Type | Plastic control box / replacement enclosure |
| Part Number | K74-36798-6 |
| Application | LA412U series solar swing gate operator control enclosure |
| Compatible Operator Type | Linear actuator swing gate operator |
| Material / Finish | Plastic enclosure |
| Power Application | Solar LA412U control box applications |
| Included Components | Control box only unless current kit listing states otherwise |
| Notes | Verify original part number, control layout, and parts diagram before ordering |
Also Known As / Related Part Numbers
- K74-36798-6
- 74-36798-6
- LM-K74-36798-6
- LiftMaster K74-36798-6
- Standard plastic control box LA412U
- Plastic control box only LA412U
Technician Note
If an LA412U operator has moisture inside the box, corroded battery leads, insect damage, or a warped cover, replace the enclosure only after checking the control board, batteries, solar input, and harnesses for damage. A new box will not correct a failed board or battery issue by itself.
Before Ordering
- Confirm the operator is LA412U, LA412UL, or a matching LA412 series solar model
- Compare the existing enclosure style and mounting pattern
- Check whether you need the box only or a complete control box assembly with electronics
- Inspect battery leads, solar wiring, antenna wire, reset switch, and harnesses before reassembly
- Verify safety devices are present and connected after service
Professional Advisory
Control box and E-box replacement involves operator power, batteries, wiring, and safety-device connections. Installation and electrical troubleshooting should be performed by a qualified gate technician, especially on commercial operators, high-voltage systems, or any gate that moves unexpectedly. Do not bypass monitored entrapment protection or required safety devices.
Important Ordering Warnings
- Do not order this as a replacement for the LA400 plastic box unless the parts diagram specifically lists K74-36798-6
- Do not assume it includes a control board, battery, antenna, or reset switch
- Damaged enclosures often hide electrical corrosion that should be inspected before the gate is returned to service
Product Questions and Answers
Is K74-36798-6 the complete LA412U control box assembly?
This listing should be treated as the plastic control box enclosure unless the current product listing states that electronics, harnesses, or batteries are included.
Will this fit a LiftMaster LA400 gate opener?
Do not assume LA400 compatibility. K74-36798-6 is tied to LA412U series solar applications; LA400 models can use different control box part numbers.
When should the plastic control box be replaced?
Replace it when the enclosure is cracked, missing the cover, no longer seals properly, has broken mounting points, or is allowing water and insects into the control area.
Does this repair a solar charging problem?
Not by itself. A damaged box can contribute to solar or battery issues, but the solar panel, batteries, charging circuit, wiring, and board should also be tested.
What should be checked before reusing the old electronics?
Inspect the logic board, battery wires, terminals, reset switch, antenna lead, and safety-device wiring for corrosion, loose connections, or physical damage.
