3900PLD Wall Mount Door Operator Parts
LiftMaster 3900PLD Replacement Parts — Light-Duty Commercial Wall Mount Operator
Genuine replacement parts for the LiftMaster 3900PLD wall mount door operator. 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.
Torsion spring doors only. The 3900PLD installs on sectional doors with torsion assemblies. It will not close unless the Protector System safety sensors and the cable tension monitor are both connected and aligned. The model label is behind the hinged door on the operator. Rated for a maximum of 10 door cycles per hour.
Motor Unit Assembly Parts
| Ref | Part # | Description |
|---|---|---|
| 1 | 41DJ001 | Logic board complete with plate |
| 2 | 41A6408 | Absolute encoder system. Now supplied as the 041B8861 travel module with wire harness |
| 3 | 41C168 | Transformer |
| 4 | 41A6095 | Motor with bracket, DC |
| 5 | 41B122 | Power cord |
| 6 | 41A6348-3 | Cover. Stocked as the 041A6348-1 |
Installation Parts
| Ref | Part # | Description |
|---|---|---|
| 1 | APBS 1 | Single button control station — not currently stocked |
| 2 | 41A4582 | Emergency release rope and handle assembly |
| 3 | 41B4494-1 | 2-conductor bell wire, white and white/red |
| 4 | 41A6104 | Cable tension monitor |
| 5 | 41C0902 | Mounting bracket |
| 6 | 041-0136 | Safety sensor kit, sending and receiving eyes. Replaces the 41A5034 shown on the diagram |
| 7 | 41A6388 | Collar with set screws, pair |
| 8 | 041-0155-000 | Safety sensor brackets, pair. Replaces the 41A5266-1 shown on the diagram |
| — | 41A6298 | Installation hardware bag — not currently stocked |
Superseded Part Numbers
The manual prints the original numbers. These parts are now supplied under new numbers — order the current part.
| Ref | Number in manual | Order this instead |
|---|---|---|
| Opener 2 | 41A6408 | 041B8861 travel module with wire harness |
| Install 6 | 41A5034 | 041-0136 safety sensor kit |
| Install 8 | 41A5266-1 | 041-0155-000 sensor brackets |
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