Joke.Thanks for having me as a new member. We have recently bought a Yanmar mini tractor 120 type. The second time we started the engine there was a red warning sign. Hope it isn't a big problem and there is someone who can explain this. thanks in advance
I came across this post, I realise you made it some time ago but I think I know the answer to your question. I too have an AF120 and have been piecing together info on it from the limited sources online.
The light is a warning that the brake linkage is installed, or that it recommends that it should be. I think from memory that it only lights up when the high gear range is selected, the warning is designed to stop the operator forgetting that the pedal linkage isn't installed and driving the tractor on the road, and then braking on one side, with presumably disastrous consequences!
As an aside, not sure if it is useful but I ran a Google Translate on the Japanese language manuals that I found, it makes for amusing reading but does offer some insight into the workings of the machine. If yours is anything like mine it has a lot of mysterious switches which took some research/guesswork to understand. PM if you're interested and I'll send you a copy.