Problem solved,with the help of kiotijohn. The shaft I was looking to control the fuild to the 3pt. is located just rear and above the hydraulic filter it looks like a small drain plug. Its in the middle of the valve that has two hoses contected to it, these hoses are used for the backhoe. I used a # 11 wrench, to turn the valve clockwise and got nothing, then turned it counterclockwise that worked. I now have normal lift on the box blade. When I reattach the BH I have to re-adjust the valve. I hope this helps but if you need help let me know . If you have a remote switch this does the fuild adjustment for you.