I think the tractor cooling systems are larger than they need to be in case of radiator clogging and heavy workload Etc. As others have stated, it is normal for it to run closer to Cold. The only time I have seen any of the Kubota's I have owned get more than 1/2 way on the gauge was when the radiator and/or screen was getting plugged up with debris. That was a sign I needed to stop and clean the radiator prefilter screen and/or the radiator itself.