Liftmaster LA100 Swing Gate Parts
LiftMaster LA100 Replacement Parts
Genuine LiftMaster replacement parts for the LA100 linear actuator swing gate operator — the residential arm-driven swing operator that pushes the gate open with a sealed electric ram rather than a chain or worm drive. 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.
The LA100 and GA200D share their parts. Every item on this page fits either operator — the control board, reset switch, transformer, alarm, arm and hardware are common to both.
Two assemblies, two tables. The control box parts (Refs 1–4) live in the wall-mounted electrical box; the operator arm parts (Refs 5–7) are on the actuator itself.
Board or whole box? If more than one component in the control box has failed, the complete K74-34501 box assembly is usually the better buy than replacing the board, transformer and alarm separately.
Common LA100 Repairs
| Symptom | Usual cause | Parts to check |
|---|---|---|
| No response to remotes or wall control | Control board | K001A6454-1CC control board |
| Operator dead, no power at the board | Transformer | K74-34153-1 transformer, K74-34501 complete box |
| Gate will not reset after an obstruction | Reset switch | K76-34003 reset switch |
| No warning tone before the gate moves | Piezo alarm failed | K76-34004 piezo alarm |
| Arm moves but the gate does not, or arm leaks | Actuator worn out | K-LA-8 replacement arm |
| Play or knocking at the gate end of the arm | Rear connector or neck bolt worn | 041ASWG-0014SA rear connector, 41ASWG-1085SA neck bolt |
| Arm bracket loose or shifting on the post | Bracket hardware | KSWG-0580SA hardware kit |
Standard Control Box
| Ref | Part # | Description |
|---|---|---|
| 1 | K001A6454-1CC | Control Board, LA100 / GA200D, 315MHz |
| 2 | K76-34003 | Reset Switch |
| 3 | K74-34153-1 | Transformer, 120V |
| 4 | K76-34004 | Piezo Alarm |
| — | K74-34501 | E-Box, LA100 |
Gate Operator Arm
| Ref | Part # | Description |
|---|---|---|
| 5 | K-LA-8 | LA100 Replacement Arm |
| 6 | 041ASWG-0014SA | Rear Connector |
| 7 | KSWG-0580SA | Hardware Kit |
| — | 41ASWG-1085SA | Neck Bolt, Ribbed |