It has been my experience over far too many years that people tend to greatly over estimate temperatures when they touch something. To most people 130 F will feel extremely hot. While for machinery with modern lubricants it is just getting started to warm up to operating temp. Cooling systems on modern vehicles are designed to run around 200F. A new electric motor carrying a full load will be so hot that if you drip water on it there will be a sizzling sound.
Comparative measurements taken when your tractor is doing different jobs will provide you with the knowledge you need to have in order to make a decision is it too hot. Infra red thermometers can be purchased for approx $30 and easily used.
I previously had a Nuffield 465 ( like a Leyland) that was a massive hunk of cast iron. When working it hard in the summer you would not want to have your legs in short pants touch the gear box casting between your legs.
Buy a thermometer, start taking some measurements and I think you will be reassured all is well.
Dave M7040