I like this video a lot as it emulates pretty closely why my tractor was purchased. I am reclaiming just short of 13 acres for a homesite, and hayfield as my grand daughters are coming to horse tending age. Theses animals are great family endeavors. As the gent mentions in the video he is not going for clear cutting out of respect for wildlife. I am doing much the same as there 30 acres there to work with and it's all woods. I forgot to mention the machine is an Allis-Chalmers HD11 Series B design. I have purged from memory any reference to "Fiat-Allis", but the tractor is a 1975 build.
Watching Youtube videos I've seen several parties block the front idler at the grouser with a timber and attempt to climb this to put slack in the track. They always use their weight to bounce on the track between the front idler and support roller to get the most slack then adjust to tension. Most then operate the machine and check it again.
Thanks for addressing the valve. I made a career out of reading, interpreting, streamlining, modifying, and writing tech manuals, so until I garner a bit of experience by reality, I have to rely upon, and solicit input from others.