This usually happens when the springs are applying too much tension to the steering knuckle. This causes the knuckle to become very stiff when trying to turn and therefore killing the steering action.
Before mounting your steering assembly back in place make sure the springs are sitting like this.
Notice that the springs sit below the ends of the steering knuckles. This way when the assembly is put back together there is no excess tension on the knuckles.
These springs are custom made by myself and are available for sale in this thread
HERE .
ph2t.