LiftMaster 8155 Belt Drive Replacement Parts
LiftMaster 8155 Replacement Parts
Genuine replacement parts for the LiftMaster 8155 belt drive garage door opener. Each section below has its own diagram and its own numbering starting at 1, so match the section name as well as the reference number. Click any part number to order.
Garage Door Opener Repair Parts
| Ref | Part Number | Description |
|---|---|---|
| 1 | 41A4371 | Sprocket cover / belt cap retainer |
| 2 | 41A4885-4 | Belt drive gear and sprocket kit |
| 3 | 41A2817 | Drive and worm gear kit — the most common drive failure |
| 4 | 41A5484-1 | Front end panel with all labels |
| 5 | 041C0279 | Light socket |
| 6 | 108D79 | Light lens |
| 7 | 30B532 | Capacitor |
| 8 | 12A373 | Capacitor bracket |
| 9 | 041D7440 | Universal motor |
| 10 | 041D7742-7 | Travel module |
| 11 | 041D8140 | Cover |
| 12 | 045ACT | Logic board (045ACTMC) |
| 13 | 041D0239-1 | Logic board end panel — current version. The 041D0239 printed on the diagram is no longer available |
Rail Assembly Parts
The rail and belt both come in three lengths. Match the length to your door height — a 7 ft door takes the 7 ft rail and the 7 ft belt.
| Ref | Part Number | Description |
|---|---|---|
| 1 | 4A1008 | Master link kit |
| 2 | 41B5424 | Belt pulley bracket |
| 3 | 41B3869-1 | Complete trolley assembly (also numbered 041B3869-3A) |
| 4 | 2777BD | One-piece rail — 7 ft (2.1 m) door |
| 4 | 2778BD | One-piece rail — 8 ft (2.4 m) door |
| 4 | 2770BD | One-piece rail — 10 ft (3 m) door |
| 5 | 41A5434-11 | Full belt assembly — 7 ft (2.1 m) door |
| 5 | 41A5434-13 | Full belt assembly — 8 ft (2.4 m) door |
| 5 | 41A5434-14 | Full belt assembly — 10 ft (3 m) door |
| — | 41B4103 | Belt tensioner assembly (not shown) |
| — | 83A11-2 | Rail grease (not shown) |
Installation Parts
| Ref | Part Number | Description |
|---|---|---|
| 1 | 882LM | Multi-function door control panel (now supplied as the 882LMW). A motion-detecting version, the 886LMW, also fits |
| 2 | 891LM | 1-button remote control. For a 3-button universal remote use the 893MAX |
| 3 | 10A20 | 3V CR2032 lithium battery |
| 4 | 29B137 | Remote control visor clip |
| 5 | 41A2828 | Emergency release rope and handle assembly |
| 6 | 41B4494-1 | 2-conductor bell wire, white and white/red |
| 7 | 41A5047 | Door bracket with clevis pin and fastener |
| 8 | 41A4353 | Header bracket with clevis pin and fastener |
| 9 | 041-0136 | Safety sensor kit, sending and receiving eyes with 3 ft bell wire. Replaces the 41A5034 shown on the diagram |
| 10 | 178B34 | Straight door arm section |
| 11 | 178B35 | Curved door arm section |
| 12 | 041-0155-000 | Safety reversing sensor brackets, pair. Replaces the 41A5266-1 shown on the diagram |
| — | 41A2770-6 | Installation hardware bag (not shown) |
| — | 877LM | Wireless entry keypad (not shown) |
Superseded Part Numbers
The diagrams print the original numbers. These parts are now supplied under new numbers — order the current part.
| Ref | Number on diagram | Order this instead |
|---|---|---|
| Opener 13 | 041D0239 | 041D0239-1 logic board end panel |
| Install 9 | 41A5034 | 041-0136 safety sensor kit |
| Install 12 | 41A5266-1 | 041-0155-000 sensor brackets |
Belt or chain? The 8155 is a belt drive — it uses the 2777BD/2778BD/2770BD rail and a 41A5434 belt, not a chain. If your rail has a chain running over a sprocket, you have a chain drive model and these rail parts will not fit.