Overview
This replacement drill motor is engineered to restore full torque and speed to cordless drill/drivers that have lost performance. A worn motor produces less power, overheats under load, and can develop a burnt smell from degraded windings. Swapping in a new aftermarket motor is significantly cheaper than replacing the entire tool.
Key specifications
- Replacement DC drill motor
- OEM-equivalent shaft and pinion gear
- Direct-fit for listed drill models
- Pre-assembled for plug-and-play installation
Compatibility
This motor is designed for DeWalt cordless drills as listed above. Verify the motor part number, shaft tooth count, and voltage match your drill before purchasing.
Installation notes
Disconnect the battery before disassembly. Remove the housing screws and separate the clamshell halves. Disconnect the motor leads from the switch assembly, noting wire positions. Extract the old motor, install the replacement, reconnect the leads, and reassemble the housing. Test at low speed to confirm proper rotation direction.
Common questions
Q: Will this N279939 motor fit my DeWalt DCD771C2, and is it the same as the motors replaced by part numbers N440316 and N294159?
Yes, this motor is listed as compatible with the DeWalt DCD771C2 and DCD776 cordless drills, and it replaces several motor part numbers including N440316, N294159, N210996, N362741, and N376649. It’s still a good idea to compare your original motor’s mounting points, shaft size, and wire terminal layout before installing.
Q: I’m replacing the motor in my DCD776 drill—do I need to replace the gearbox too, or can I swap just the N279939 motor?
In many cases you can replace just the motor if the gearbox and clutch assembly are still in good condition and the gears are not stripped or excessively worn. When transferring the gearbox, make sure it seats fully on the new motor and check that the pinion engages smoothly before reassembling the drill housing.
Q: After installing this replacement motor in my DeWalt drill, is there anything I should do to help it last longer?
Yes—run the drill with no heavy load for a short period first so the new motor can settle in, and make sure the vents stay clear of dust and debris. If your drill was overheating before, also inspect the chuck, gearbox, and trigger switch, because excess drag or poor electrical contact can shorten motor life.
