Instructions available now at rebrickable.com:
rebrickable.com/mocs/MOC-1817...
This video shows my latest Lego Technic MOC, the Lego Technic John Deere 9RX 830 with speed disk and it´s features.
It is an alternate build of the Lego Technic #42131 Cat D11 Bulldozer and consists of 3431 parts. This means that everything you need to build it yourself is the 42131 set by Lego and my instructions.
The model uses all 4 motors and the hub of the 42131 set. The two large angular motors operate the 4-track-drive, the two large motors operate and shift the multifunctional gearbox that powers all additional functions of the tractor and the speed disk including the articulated steering and the opening mechanism of the hood.
The tractor features a rear main PTO and a rear secondary PTO to power the functions of the speed disk. When the disk is attached to the tractor, the wings can be unfolded and it can be lowered to the ground remote controlled by the motors in the tractor selected through the multifunctional gearbox.
After your purchase you will be able to download the high quality building instructions with building steps, renders, explainations and fotos as pfd-file as well as the instructions on how to set up the app Brickcontroller 2 and Powered Up to be able to controll the finished model. A third way of controlling the model is also included: Pybricks. It is an alternate firmware for Control+ hubs running a Python based code that lets you control the model just with the Lego train remote. No smartphone needed!
Enjoy watching and have fun!
Lars
(Video shot on DJI Osmo Pocket 3)