The U bracket is not shown in the instruction manusl, I called KK and they told me to 'just throw it away'. I of couse did not do that. On the uprights there are 2 holes, each of those holes gets a bolt with a spacer. The spacer keeps the uprights apart. The bracket that you have goes on the LOWER of the 2 bolt spacer holes. the U will be pointing down toward the cutter deck. The problem comes when you hook up the toplink to that U bracket. With the pin inserted through the U and the toplink, the ends of the pin will smack into the uprights /forums/images/graemlins/mad.gif What you have to do is hammer the U bracket so that there is less space between the U brackets legs. That way the pin will clear the uprights, it does not take alot of hammering to get them to clear the uprights.
When I assembled my 60" KK last year, I discovered the U bracket problem, as well as this little gem, when you attach them long brace links from the tailwheel to the holes in the top of the uprights, you MUST make sure that the bolts where the brace bolts to the tailwheel bracket remain Very loose, but not so loose that the nuts can pop off. They have to be a few threads on, but very loose. This is because you are going to have a hell of a time getting the links to both twist slightly and line up with the front upright holes. Take you time, you are going to need a set of good clamps to get every thing lined up so that you can put in the bolts and spacers and the U bracket. Be very careful, these parts are under alot of force as you get the bolts in, and do sping out at you if you are not careful. /forums/images/graemlins/shocked.gif
As far as the lower pins are concerned, I moved mine from the shipped location. Mine are installed inplace of the bolt and nut where the uprights are bolted to the deck. You will have to get a large drill bit because the existing deck bolt is smaller the lift pin diameter.
I found it easier to leave the bolts OUT where the uprights connect to the cutter deck and put all the bolts loosely in place at the top of the uprights. This allowed for getting the U bracket and the spacers with bolts in place and the nuts started. Then you can move the lower part of the uprights into position with clamps and a large drift or screwdriver.
Hope this helps, take your time and think it out, it does require some force to get everything lined up, but once it is on the tractor you will be suprised what the KK will go through, at least I was. /forums/images/graemlins/grin.gif