The SIKU Massey 8680 was the first RC tractor that I built and as you would expect it had the most problems. The first problem was that the engine was exposed which meant that I couldn’t simply remove it and fill the space under the bonnet with electronics. I decided to mill part of the plastic engine away and mount the servo inside it, this worked quite well.

I then had many issues with the drive system for the tractor involving shredding plastic gears in the gearbox and burning out servo controllers.

The full details of the problems as well as the cost of making your own radio controlled Massey 8680 can be found here.