LiftMaster 8557 Belt Drive Replacement Parts
LiftMaster 8557 Replacement Parts
Genuine replacement parts for the LiftMaster 8557 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 | Cover with screws / belt cap retainer |
| 2 | 41A4885-5 | Gear and sprocket assembly |
| 3 | 41A2817 | Drive and worm gear kit — the most common drive failure |
| 4 | 41B4245-1 | Line cord, 6 ft |
| 5 | 041A7756 | End panel |
| 6 | 41C279 | Light socket |
| 7 | 41A7562 | Light lens |
| 8 | 30B652 | Capacitor |
| 9 | 41A5532 | Gear case |
| 10 | 41A3150 | Terminal block with screws |
| 11 | 041A7767 | Motor |
| 12 | 041D7742-5 | Travel module |
| 13 | 041A7619-4 | Cover |
| 14 | 45ACT | Logic board (045ACTMC). A Wi-Fi version, the 050ACTWF, is also stocked — match the number on your old board |
| 15 | 41D216 | Logic board end panel with all labels and light socket |
| — | 041A7814 | Dual wire harness kit (not shown) |
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 | 41A5434-11 | Belt — 7 ft (2.1 m) door |
| 1 | 41A5434-13 | Belt — 8 ft (2.4 m) door |
| 1 | 41A5434-14 | Belt — 10 ft (3 m) door |
| 2 | 41B5424 | Belt pulley bracket |
| 3 | 4A1008 | Master link |
| 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 | 41B3869-3A | Trolley assembly |
| 6 | 41B4103 | Tensioner assembly |
| 7 | 109B48 | Trolley threaded shaft — contact us for availability |
Installation Parts
| Ref | Part Number | Description |
|---|---|---|
| 1 | 178B35 | Curved door arm |
| 2 | 41A5047-1 | Door bracket with clevis pin and fastener — the black belt drive version |
| 3 | 41A2828 | Emergency release rope and handle |
| 4 | 41A4353-1 | Header bracket with clevis pin and fastener — the black belt drive version |
| 5 | 29B137 | Remote control visor clip |
| 6 | 041-0155-000 | Safety sensor brackets, pair. Replaces the 41A5266-1 shown on the diagram |
| 7 | 041-0136 | Safety sensor kit, sending and receiving sensors with 2-conductor wire. Replaces the 41A5034 shown on the diagram |
| 8 | 178B34 | Straight door arm |
| 9 | 41B4494-1 | White and red/white bell wire |
| 10 | 10A19 | 3V CR2016 lithium battery — note this is the CR2016, not the CR2032 used on other models |
| 11 | 041A5281-1 | Sensor extension brackets |
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 |
|---|---|---|
| Install 6 | 41A5266-1 | 041-0155-000 sensor brackets |
| Install 7 | 41A5034 | 041-0136 safety sensor kit |
Black brackets, not grey. The 8557 uses the black belt drive versions of the door bracket (41A5047-1) and header bracket (41A4353-1). The plain 41A5047 and 41A4353 are the chain drive parts and will not match.