Adjusting the brake and steering clutches on a john deer 350b dozer

O athat mean the clutch adjustment is too tight and does not totally engage? I had a full load in the bucket and when backing out, would not back straight out but kept turning because the left track was not pulling. I pulled JDEMARIS instructions and tried to follow them. On the left, the ball joint link is adjusted all the way out, no more adjustment. On the right, the 3/4 brake bolt will not turn. The head acts like it is recessed in the lever and will not turn the 180, either direction.
Another problem, the foot brake does not work. The linkage under the floorboards acts like it is not connected to anything at the rear. Where is it supposed to connect? I can udjust the yoke on the linkage all the way either direction and no change. The pedal goes to the floor with no effect.