Description
Overview
RS-550 brushed DC motor with a pinion gear fitted to the shaft, intended as a replacement motor for cordless electric screwdrivers and similar small power tools. The motor is marked GRS550VC and rotates counter-clockwise (CCW).
Specifications
- Model: RS-550 / GRS550VC
- Voltage options: 10.8V / 12V / 14.4V / 16.8V / 18V / 21V / 25V
- Rotation: CCW (counter-clockwise), as marked on the motor can
- Pinion gear: 9 teeth or 12 teeth
- Type: brushed DC motor with gear pinion
- Construction: metal can with rear vent openings and solder tab terminals
Purpose
Brushed motors in cordless screwdrivers wear out their brushes or bearings long before the rest of the tool is finished. Replacing just the motor restores full torque at a fraction of the cost of a new tool, provided the voltage and gear tooth count match the original.
Applications
- Cordless electric screwdrivers
- Small cordless drills and drivers
- Power tool repair and refurbishment
- DIY motor projects requiring a geared brushed motor
How to Use
- Take the old motor out and read the markings on the can — match the voltage rating and the pinion tooth count before ordering.
- Check the rotation direction. This motor is CCW; if your tool needs the opposite direction, reversing the supply polarity will reverse the rotation.
- Transfer or fit the pinion gear to the new shaft if it is not already installed, keeping the mesh depth the same as the original.
- Solder or clip the supply leads to the two terminals.
- Test the motor briefly out of the gearbox first to confirm direction and that it spins freely, then reassemble.
- Voltage: 10.8V / 12V / 14.4V / 16.8V / 18V / 21V / 25V
- Gear: 9 teeth or 12 teeth
- High torque gear box motor


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