Chamberlain 248739 Belt Drive Parts
Chamberlain 248739 Replacement Parts
The 248739 is a square rail belt drive opener. Its belt, rail, trolley and U bracket are square rail specific and will not interchange with the T-rail parts used on most belt drives. Everything for it is on this page — the reference numbers below match the diagram.
Ordering a belt? The 248739 takes the 041A5250 square rail belt, sized to your door height. Check that your rail is square in section before ordering — the square rail and T rail belts are not interchangeable.
1. Garage Door Opener Repair Parts
First part of number below corresponds to diagram number above:
| Ref | Part Number | Description |
|---|---|---|
| 01 | 041A4371 | Belt cap retainer |
| 02 | 041A4885-5 | Gear and sprocket assembly |
| 03 | 041B4245-1 | Line cord, 6 ft |
| 04 | 041A5484-10 | End panel with all labels |
| 05 | 041C0279 | Light socket |
| 06 | K108D0079M | Light lens |
| 07 | K030B0532-1 | Capacitor |
| 08 | K012A0373 | Capacitor bracket |
| 09 | 041A3150 | Terminal block with screws |
| 10 | 041C4842 | Motor |
| 11 | 41A5525-4 | Cover — no longer available |
| 12 | 041A2818 | Limit switch drive and retainer |
| 13 | 041D3452 | Limit switch assembly |
| 14 | 041A2822-1 | Interrupter cup |
| 16 | 041AB050-2M | Receiver logic board assembly |
| 17 | 041C5499 | High voltage wire harness |
| 17a | 041C5500 | Low voltage wire harness |
| 18 | 041D0180-1 | End panel |
| — | 041A2825 | Opener assembly hardware kit — not shown on diagram |
Cover no longer available. The ref 11 cover (41A5525-4) is discontinued with no replacement. Every other part on this diagram is available. The 041AB050-2M is the current receiver logic board — read the number printed on the board you are removing before ordering, and call (866) 965-5599 if it is not this one.
2. Rail Assembly Parts
First part of number below corresponds to diagram number above:
| Ref | Part Number | Description |
|---|---|---|
| 01 | 004A1008 | Master link kit |
| 02 | 041C5141-2 | Complete trolley assembly, square rail |
| 03 | 041A5665-2 | Square rail |
| 04 | 041B4103 | Belt tensioner |
| 05 | K144C0054M | Idler pulley, wide, for belt drive |
| 06 | 041A5250 | Full belt assembly — 7 ft door |
| 07 | 041D0598-1 | U bracket, square rail |
| — | 183A163 | Wear pads — not shown on diagram |
| — | 041A7920-2 | Installation hardware bag — not shown on diagram |
A belt rarely fails on its own. Check the idler pulley, trolley, tensioner and wear pads while the rail is apart — worn pads let the trolley rock in the rail and will chew through a new belt in months.
3. Installation Parts
First part of number below corresponds to diagram number above:
| Ref | Part Number | Description |
|---|---|---|
| 01 | 041C0494-2 | Multi-function door control panel — replaces 041C0494-1 |
| 03 | 10A20 | 3V CR2032 remote battery |
| 04 | K029B0137 | Remote control visor clip |
| 05 | 041A2828 | Manual release rope and handle assembly |
| 06 | 041B4494-1 | 2 conductor bell wire, 26 ft |
| 07 | 041A5047-1 | Door bracket, black — belt drive units |
| 08 | 041A5047-3 | Header bracket for square rail |
| 09 | 041-0136 | Safety sensor eye kit — replaces 41A5034 |
| 10 | 4178B0034B | Straight door arm section |
| 11 | K012B0776 | Hanging bracket |
| 12 | 041B0035B | Curved door arm |
| 12–13 | 041-0155-000 | Safety sensor brackets — replaces 41A5266-1 |
| — | 041-0365-000 | Sensor eyes and brackets — the complete set |
| — | 373LM | 3 button remote control |
| — | 893MAX | 3 button visor remote — universal replacement |
This is a pre-1998 opener. Its wall control is the 041C0494-2, which replaces the discontinued 041C0494-1. The modern 889LM and MyQ panels will not work on it. The ref 12 and 13 sensor brackets (41A5266-1) are also discontinued — the 041-0155-000 above replaces them.
If you need eyes and brackets, the 041-0365-000 is the complete set and works out cheaper than buying them separately. The 893MAX is the universal replacement for older Chamberlain, LiftMaster and Craftsman remotes — browse all Chamberlain remote controls.
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