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Kato 11-109 & 11-110 motorised chassis take-a-part
Opening a Kato 11-109 or 11-110 isn’t that hard, even though it seems so at first. Making it digital is easy, as the wires of the motor are not soldered to the chassis. The photos below will make it clear.
Bonus: If you experience a rattle when driving in one direction, scroll to the end of the page for how to solve this!
Template for 11-109/11-110
With your thumbs, push on the parts of the metal that sticks through the plastic cover, while holding the outsides of the cover with your fingers. It should be quite easy to the metal frame out of the cover (The cover is held in place by tabs on the edges of that metal and on tabs in the middle of the long ends).
The this is what you find.
Pull the bottom cover off and the contacts and the wheels will fall out.
Simply pull the contacts out of the side with fine tweezers.
The motor is not held in place and can easily be taken out. The 12V coreless motor measures 7 x 20 mm.
Do you experience a fine drive in one direction, but a rattle when driving in the other direction? The motor shaft is then touching the metal chassis. Luckily, this is easy to solve! File 1mm off the end of the motor shaft.