This is a mod to be able to use a standard 540 size motor with your tractor.
You'll need to replace some parts and two extra screws for the motor. I recommend a high turn motor (I use 80T).
Let's play with the tractor!!
With OpenRC tractor, possibilities are endless, new tools keep coming...so stay tuned!! (see below updates and get more details at (http://www.makitpro.com)
Download original Tractor from: http://www.thingiverse.com/thing:1967086