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
- Operating voltage: 550V
- 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 Bosch 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 RS-550VC-8518 12V 13-tooth motor fit my Bosch PS31-2A-RT, or is it only for the PS21-2A and GSR12V-140FCB22?
This motor is listed as compatible with Bosch PS31-2A-RT, PS21-2A, and GSR12V-140FCB22, but you should still match the original motor’s voltage, can size, and 13-tooth pinion before installing. If your old motor is marked RS-550VC-8518 and uses the same gear tooth count and shaft setup, it should be a proper replacement.
Q: Do I need to swap the pinion gear when installing this RS-550VC-8518 motor in a Bosch PS31-2A drill driver?
This version already comes with a 13-tooth gear, so in many cases you will not need to press your old pinion off and reuse it. Before reassembly, check that the gear mesh is smooth inside the transmission and that the pinion position on the shaft matches the original motor to avoid noise or premature wear.
Q: My Bosch 12V drill runs weak and smells hot—will replacing the RS-550VC-8518 motor fix that, and is there any maintenance I should do during installation?
If the original motor is sparking heavily, overheating, or losing torque under load, replacing the motor often solves the problem as long as the battery, switch, and gearbox are still in good condition. During installation, clean out dust from the housing, inspect the gearbox for worn grease or damaged gears, and make sure the motor terminals and wire connections are tight before closing the tool.
