Description
Overview
An RS550 brushed DC motor with a high-torque reduction gearbox, sized as a replacement drive for cordless screwdrivers and drills. Choose a 9-tooth or 12-tooth gear across voltage ratings from 10.8V to 25V.
Specifications
- Frame: RS550, brushed DC
- Output gear: 9 teeth or 12 teeth
- Voltages: 10.8V, 12V, 14.4V, 16.8V, 18V, 21V, 25V
- Gearbox: high-torque reduction
- Fits: cordless screwdrivers, drills
Purpose
Worn brushes or a stripped pinion retire a cordless tool long before its battery does. This assembly restores the drive at the original voltage and tooth count, so the gear train still meshes.
Applications
- 12V and 18V drill driver repair
- Electric screwdriver rebuilds
- 14.4V and 16.8V tool platforms
- Hobby robotics drives
- 21V and 25V mechanisms
How to Use
- Count teeth and read the old motor’s voltage label before ordering; 9 and 12-tooth gears do not interchange.
- Note polarity and lead routing, then desolder the old leads.
- Seat the motor in the gearbox and check the pinion meshes without binding.
- Resolder with the original polarity, then test at no load before full service.
- Never exceed the rated voltage — a 12V winding on an 18V pack overheats.
Need help specifying this connector?
Use our practical guides for current and wire selection, connector validation and OEM harness drawings.




























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