Chamberlain B4643T Belt Drive Parts
Chamberlain B4643T Replacement Parts
The B4643T is a DC belt drive opener with a built-in camera, running on a square rail. It differs from the other B-series openers in two ways that matter when ordering: it has no battery backup, and its head unit carries camera and light pod parts the non-camera models do not. This parts list covers all variants:
- B4643T
- B4643ST
- B4643STC
- B4643STCH
Camera not working, or light pod damaged? The camera and the light pod are separate parts — the 041-0041 camera with decorative cover at key 12, and the 041-0201-000 single lens light pod at key 3. If only the trim ring is broken, the 041-0205-000 decorative ring is the cheap fix.
1. Garage Door Opener Repair Parts
First part of number below corresponds to diagram number above:
| Key | Part Number | Description |
|---|---|---|
| 1 | 041C1751 | Belt cap and sprocket kit |
| 2 | 041-0198-000 | End panel, no battery access |
| 3 | 041-0201-000 | Light pod kit, single lens, camera model |
| 4 | 041D0277-2 | Transformer, Wi-Fi non-battery backup |
| 5 | 041-0204-000 | Control door panel |
| 6 | 041-0236-000 | Motor with travel module, DC |
| 7 | 041-0197-000 | End panel, no lock |
| 8 | 050DCTBMC | Logic board, Bluetooth enabled |
| 9 | 041D8071-4 | Travel module kit, universal DC |
| 10 | 041B4245-1 | AC power cord, 6 ft |
| 11 | 041A3150 | Terminal block |
| 12 | 041-0041 | Camera with decorative cover |
| — | 041-0205-000 | Decorative ring, camera — not shown on diagram |
| — | 041-0181-000 | Wire harness, camera and LED pod, single lens — not shown on diagram |
Two things to check before ordering. First, the transformer is the 041D0277-2, the non-battery-backup version — the 041D0277-1 used on the battery models will not suit this opener. Second, the end panels are camera-specific: 041-0198-000 has no battery access and 041-0197-000 has no lock. Panels from the non-camera B-series models will not fit. Read the numbers off the parts you are removing, and call (866) 965-5599 if you are unsure. The motor at key 6 comes with a travel module, so you do not need both.
If the door reverses at the wrong point or will not learn its travel, that is usually the travel module alone rather than the motor or the board — a cheaper part and a quicker job.
2. Rail Assembly Parts
First part of number below corresponds to diagram number above:
| Key | Part Number | Description |
|---|---|---|
| 1 | 041A5250 | Belt kit — 7 ft door |
| 1 | 041A5250-1 | Belt kit — 8 ft door |
| 1 | 041A5250-2 | Belt kit — 10 ft door |
| 2 | K144C0054M | Belt idler pulley |
| 3 | 004A1008 | Chain, #48, master link |
| 4 | 041A5665 | Rail kit, 7 ft |
| 5 | 041C5141-2 | Square rail trolley kit |
| 6 | 041D0598-1 | U bracket adapter |
| 7 | 041A6689 | Threaded shaft, D shape |
| 8 | 041B4103 | Belt tensioner kit |
| — | 041A7276 | Trolley wear pads — not shown on diagram |
| — | K083A0011-1 | Lithium rail grease — not shown on diagram |
The belt is sized to your door height, not your rail — measure the door opening. A belt rarely fails on its own: check the idler pulley, trolley, tensioner and wear pads while the rail is apart. Re-grease with the lithium grease above; do not use general purpose spray lube on a square rail.
3. Installation Parts
First part of number below corresponds to diagram number above:
| Key | Part Number | Description |
|---|---|---|
| 1 | 041B0035B | Curved door arm |
| 2 | 041A5047-1 | Door bracket |
| 3 | 041A2828 | Emergency manual release rope |
| 4 | 041A5047-3 | Header bracket — square rail |
| 5 | K029B0137 | Remote control visor clip |
| 6 | 041-0155-000 | Safety sensor bracket kit |
| 7 | 041-0136 | Safety sensor kit |
| 8 | 4178B0034B | Straight door arm |
| 9 | 041B4494-1 | White and red bell wire |
| 10 | K010A0020 | 3V CR2032 lithium battery |
| 11 | K012B0776 | Hanging bracket kit |
| — | 041A7920-2 | Hardware kit — not shown on diagram |
| — | 041-0365-000 | Sensor eyes and brackets — the complete set |
| — | 893MAX | Universal replacement remote |
The B4643T takes the 041A5047-3 square rail header bracket — the standard header brackets will not fit. If your sensor brackets are bent or missing as well as the eyes, the 041-0365-000 includes both and works out cheaper than buying them separately.
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