</font><font color="blue" class="small">( I am still wondering if the tc will have any problem with lifting. )</font>
Do you mean lifting the 7' mower? I don't think you will have any problem at all lifting that mower. If you want to drive long distances down the road or across your pasture, I'd recommend leaving the tailwheel on the ground just because it will take a lot of pressure off the 3PH. Also, if you don't have weight on the front of the tractor, the 7' cutter will make you light on your front wheels. That's why many folks mow with the loader on.
There are two areas I know of that would concern me about the KK. When you lift it all the way up with the 3PH, the geometry of that cutter with the float attachment will make the mower frame hit the rear wheels. Just experiment and find out how high you can raise the cutter.
Another thing is the hp of the gearbox. Even though the TC45 has less than 40 hp at the PTO, I'd want a 60 hp gearbox for the long run, especially on a 7' cutter. I don't think a 40 hp gearbox will hold up that long. My 5' TSC KK cutter had a failure of the gearbox just this last year. It was 5 years old, but I don't think it was really strong enough for the TC45.
I hope you enjoy your tractor. I think the TC45 is a great sized tractor for 20 acres. /forums/images/graemlins/cool.gif