Model Number: RS550 Voltage: 12 - 24V DC No Load Current: 1.1A Working Current: 6.53A No Load Speed: 25000RPM Torque: 1555.3g.cm Power: 200W Shaft Diameter: 3.175mm Output Shaft Length: 18mm Gear Teeth: 8 - 19 Teeth Commutation: Brush Installation Screw Size: M3 (Not included) Installation Screw Spacing: 25mm Rotation Direction: CW/CCW Stall Current: 45A Product Name: RS550 DC Motor with 8 - 19Teeth Gears Features: Gear Installation Steps and Attention Points: 1. Compare the gear teeth on the original motor, select the teeth of the same size; 2. Press a sturdy object against the motor shaft in the center of the rear end (back cover) of the motor; 3. Align the center hole of the gear with the motor output shaft, use hammer carefully tap to install on the motor shaft. Note: 1. When installing, please place the bottom(rear end) of the motor on solid surface. 2. When installing the gear, be sure to tap with extreme care as it is a press fit. 3. Before installing the gear, please verify carefully. Once installed, it cannot be easily removed unless a special gear puller is used. Note: 1.When installing the gear, be sure to tap with extreme care as it is a press fit. Once installed, it cannot be easily removed unless a special gear puller is used.