Sometimes the "over center" nut will leak. It's on top of the pump in the front.
The input shaft preload is not hard to adjust. Just remove the steering shaft (I like to tie the steering wheel so it does move), knock of the big lock nut with a hammer and punch. The flat plat being held in position by the lock nut has two holes in it. Rather than a hammer and punch, I used two small punches stuck in the holes to adjust. Mine was easy to turn. Snug the plate and then back off 3/16". If you have it too snug, steering will be difficult and the wheel won't return to center after a turn. Reinstall the lock nut and steering shaft after the adjustment is made.