Liftmaster LA400U & LA400UL Swing Gate Parts
LiftMaster LA400U & LA400UL Replacement Parts
Genuine LiftMaster replacement parts for the LA400U and LA400UL linear actuator swing gate operators — the UL325-listed generation of the LA400, with the K1D8388-1CC main board in a moulded plastic control box. Use the diagram above to find the key number for the part you need, then click any part number in the tables below to go straight to that product.
U or UL? The control box is the one part that differs. LA400U takes K74-36798-5; LA400UL takes K74-39307-2. Everything else on this page fits both.
Older LA400 with a metal control box? That is the pre-UL325 model and its control box parts are completely different — see the LA400 parts page. The arm parts (K1–K5) are the same on both.
Bracket kits are one digit apart. K77-19130 is the standard hardware kit, K77-19130-1 is the two-post variant.
The fuse is not a LiftMaster part. It is a standard 20 amp automotive blade fuse; K74-30941 is the kit if you want the correct spares to hand.
Common LA400U Repairs
| Symptom | Usual cause | Parts to check |
|---|---|---|
| Gate runs on mains but dies in a power cut | Battery pack at end of life | K74-30762 battery pack, K94-36274-1 battery harness |
| Operator completely dead | Blown fuse or no supply at the receptacle | K74-30941 fuse kit, K76-36296-1 receptacle, APOW3 transformer |
| No response to remotes, wired controls work | Antenna or main board | K77-36541 antenna, K1D8388-1CC main board |
| Gate will not reset after an obstruction | Reset switch | K94-36408-2 reset switch |
| No warning tone before the gate moves | Piezo alarm failed | K94-36411 piezo alarm |
| Arm hums but the gate does not move | Motor worn or arm seized | 041ASWG-0438SA motor, LA400DC primary arm |
| Cannot release the gate by hand | Release lever or key | 041ASWG-0442SA lever, 041ASWG-0119 release keys |
| Needs monitored entrapment protection | Upgrade to current UL325 requirements | K1D8388-1CCU upgrade kit with eyes |
Standard Control Box
| Ref | Part # | Description |
|---|---|---|
| 1 | K74-36798-5 | Control Box, Plastic — LA400U |
| 1 | K74-39307-2 | Control Box, Plastic — LA400UL |
| 2 | K94-36408-2 | Reset Switch |
| 3 | K94-36411 | Piezo Alarm |
| 4 | K1D8388-1CC | Main Board, Linear Actuators, UL325 |
| 5 | K75-36635 | Control Board Mounting Bracket |
| 6 | K76-36296-1 | Receptacle |
| 7 | K74-30762 | Battery Pack, 12V, 7A |
| — | K1D8388-1CCU | Upgrade Kit with Eyes, LA, UL325 |
| — | K94-36274-1 | Battery Wire Harness, 7AH |
| — | K77-36541 | Antenna |
| — | K74-30941 | Fuse Kit |
Gate Operator Arm
| Ref | Part # | Description |
|---|---|---|
| K1 | 041ASWG-0442SA | Release Lever |
| K2 | 041ASWG-0438SA | Motor, 24V |
| K3 | 041ASWG-0014SA | Rear Connector |
| K4 | LA400DC | Primary Arm |
| K5 | 041ASWG-0489 | Cable, 24V, 3m, with Connector |
| — | 041ASWG-0119 | Release Key, Qty 2 |
| — | K77-19130 | Hardware Kit, LA400 / LA412 |
| — | K77-19130-1 | Two Post Bracket Kit, LA400 / LA412 |
Accessories
| Ref | Part # | Description |
|---|---|---|
| — | APOW3 | Transformer |