Black and Decker PS1800 Transmission Replacement

Lay the drill on its side, assuring that the screw holes are facing upwards.

Remove seven 12 mm screws using a Phillips #00 screwdriver.

Separate the outer drill case to expose the components and switch.

Locate the motor at the top left hand corner.

Carefully disconnect the red and black wires attached to the motor.

Unscrew the motor from the drill's transmission.

Remove the motor from the transmission assembly, as pictured.

Unscrew the torque adjuster from the transmission by removing the screws highlighted in the lefthand picture.

Align the new transmission gears with the motor’s gears.

Reattach the transmission and motor by rescrewing the initial screws.

Reconnect the torque adjuster to the transmission by following the procedure seen in step 6.

Reconnect black and red wires onto the motor and place the motor, transmission and torque adjuster back onto their initial location.

Reconnect the clamshell.

Press trigger to make sure the new transmission works.